Power Management
Subcategories
Products (2,800+)
LM34936QPWPRQ1 - 30V Wide VIN 4-Switch Buck-Boost Controller | TI
The Texas Instruments LM34936QPWPRQ1 is an automotive-qualified, synchronous four-switch buck-boost DC/DC controller that regulates the output voltage at, above, or below the input voltage, housed in a 28-pin HTSSOP (PWP) power package with an exposed thermal pad. It supports a wide 4.2V to 30V input range (42V absolute maximum transient) and operates at a typical switching frequency of 600 kHz, making it suitable for industrial and automotive power systems that must hold regulation through cold-crank, load-dump, and start-stop transients. A buck-boost controller is a switching power supply topology that combines a buck (step-down) converter and a boost (step-up) converter into a single four-switch bridge, allowing the output to remain regulated when the input voltage crosses the output voltage. The four-switch buck-boost sits in the broader hierarchy of DC/DC controllers -> power management ICs -> mixed-signal semiconductors, and is the preferred architecture when the input range is wide and crosses the regulated output voltage (for example, a 12V automotive rail that drops to 4V during cranking and surges to 35V on load-dump). Key features include 4A peak switch current capability, current-mode control in both buck and boost modes for superior load and line transient response, adjustable output voltage, cycle-by-cycle current limiting, hiccup-mode current limiting, adjustable soft-start, frequency synchronization, spread-spectrum EMI optimization, and AEC-Q100 automotive qualification. The 600 kHz switching frequency allows the use of small external inductors and ceramic output capacitors while still meeting CISPR 25 Class 5 EMI targets when combined with the spread-spectrum feature. The LM34936-Q1 uses peak current-mode control with a precision internal reference and a programmable compensation network, enabling stable loop response across the entire operating region including the buck-boost transition. The four-switch H-bridge architecture eliminates the need for a bulky transformer and supports continuous-conduction operation with seamless mode transitions, removing the output ripple glitch typical of two-switch boost-buck cascaded topologies. Typical applications include automotive infotainment power, ADAS sensor rails, USB-PD and Type-C chargers, industrial battery-powered equipment, and 24V industrial bus regulators. The wide VIN range and AEC-Q100 qualification make it especially well suited for automotive power-tree designs where regulation must be maintained across cold-crank (4.2V) and load-dump (35V) events on the same PCB. When designing with this controller, pay close attention to the inductor saturation current (must exceed 4A peak), the input/output ceramic capacitor RMS current rating, and the exposed-pad PCB layout for thermal dissipation. The spread-spectrum feature and frequency synchronization pin together allow multiple converters to be phase-shifted for reduced input ripple in multi-rail systems. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing an AEO-optimized engineering resource for selecting and implementing the LM34936QPWPRQ1.
LM3502ITL-25 - 600mA Dual White LED Boost Driver | Texas Instruments
The Texas Instruments LM3502ITL-25 is a dual-output, PWM-dimming, step-up DC-DC LED driver rated for a 600 mA switch current in a 10-pin MicroSMD package. The verified distributor data identifies it as a white-LED driver for dual-display or large single-string backlighting. Its boost topology raises the battery or supply voltage to the LED-string level, while PWM dimming controls average illumination. The switching frequency is specified as 800 kHz to 1.2 MHz. The -25 suffix denotes the verified ordering variant, although the complete timing value associated with that suffix is not present in the supplied snippets and is not inferred here. A boost LED driver is a DC-DC converter in the power-management and LED-driver hierarchy. It regulates current through one or more white-LED strings whose forward voltage rises as more LEDs are connected in series. This LM3502 provides two output channels, cycle-by-cycle current limiting, over-voltage protection, and under-voltage protection without external compensation, according to the supplied National Semiconductor datasheet material. Those protections help a display backlight remain controlled during output overvoltage or startup abnormalities. Key verified features include two outputs, PWM dimming, step-up boost topology, 600 mA switch current, and an 800 kHz to 1.2 MHz operating-frequency range. Its dual-output architecture is useful when a display needs independent LED strings or when one large string is arranged as two driven sections. The high switching-frequency range supports compact magnetics and capacitors, although actual component sizing requires the complete datasheet and the intended LED-string voltage and current. The device operates as a switched power converter rather than a linear regulator, so its efficiency and thermal behavior depend on input voltage, output voltage, LED current, switching losses, inductor selection, diode selection, and PCB layout. A boost stage increases voltage and transfers energy through an inductor; therefore, output voltage must be checked against the absolute-maximum and protection limits in the manufacturer datasheet before a board is released. Typical applications include portable-display backlighting, dual-display white-LED illumination, and large single-string LCD backlighting. In a portable system, PWM dimming permits brightness adjustment without changing the LED-string current set point. In a dual-display arrangement, the two outputs can serve matched backlight sections, but channel independence, dimming behavior, and fault response must be verified against the full datasheet. A key design requirement is to follow the manufacturer’s inductor, Schottky-diode, compensation, and capacitor recommendations exactly. Keep the switching loop small, provide low-impedance input and ground paths, and verify ripple, startup, dimming frequency, and thermal performance on the target display load. This page combines verified distributor specifications, sourcing information, and practical application guidance beyond a basic distributor listing.
LM3502ITL-44 750mA Step-Up LED Driver | Texas Instruments
Texas Instruments LM3502ITL-44 is a dual-output step-up DC-DC converter and white-LED driver rated for a 750 mA switch current, packaged in a 10-ball VFBGA device measuring 1.9 mm by 2.07 mm. It is intended for dual-display or large single-string white-LED backlighting, with PWM dimming support and a switching frequency of 2 MHz. A white-LED driver is a power-management IC that uses a step-up converter to raise a supply voltage above the forward voltage of an LED string. Within the hierarchy of LED drivers, boost converters, DC-DC converters, and power-management ICs, the LM3502 provides the high current and compact packaging required by modern display backlighting while adding controlled dimming through PWM. The verified distributor listing identifies the device as a 2-output, step-up DC-DC regulator with PWM dimming and a 750 mA switch rating. The -44 suffix identifies the manufacturer ordering variant shown in the supplied records. The 10-ball VFBGA package places the switching and control connections in a compact surface-mount footprint suitable for space-constrained display and lighting equipment. The LM3502 uses an inductive boost topology to supply LED strings whose combined forward voltage can exceed the available input rail. Its switching architecture permits high conversion ratios, while PWM dimming allows brightness to be controlled without operating the LED drive path continuously at full command level. The dual-output arrangement supports applications involving two separately driven display or lighting channels, subject to the configuration and current limits defined in the manufacturer datasheet. Typical uses include LCD backlighting, dual-display white-LED illumination, keypad and status lighting, and compact backlit instruments. In these systems, the IC regulates LED current while the external inductor, switching components, and feedback network complete the power-conversion loop. Appropriate PCB layout and current-limit selection are essential because boost converters combine high di/dt current pulses with sensitive feedback and dimming signals. For an LM3502ITL-44 design, verify the exact LED-string voltage, total current, switching-current margin, inductor saturation current, and PWM polarity against the manufacturer datasheet. Keep the switching loop compact and provide a low-impedance ground return so the small 10-ball package can deliver repeatable current regulation without excessive EMI or unstable dimming behavior.
LM3502SQ-25 - Dual-Output Boost LED Driver | Texas Instruments
The Texas Instruments LM3502SQ-25 is a dual-output, PWM step-up white-LED driver with a 600 mA switch current rating, an 800 kHz to 1.2 MHz switching-frequency range, and a 16-WQFN package measuring 4 mm by 4 mm. It is designed for dual-display or large single-string white-LED backlighting, where independent dimming and accurate current regulation help balance brightness across multiple light strings. A boost LED driver is a step-up DC-DC converter specialized for LED backlighting. It raises a battery or lower-voltage supply to the voltage required by a series LED string, while regulating the string current instead of relying on voltage alone. In the power hierarchy, the LM3502SQ-25 belongs to the LED-driver class of power-management semiconductors and uses pulse-width modulation for dimming and current regulation. The verified device data identifies PWM step-up topology, two outputs, white-LED backlighting, and a 600 mA switch-current specification. Its switching frequency ranges from 800 kHz to 1.2 MHz, supporting compact magnetics and capacitor selection for display backlighting. Listed protections and control features include cycle-by-cycle current limit, over-voltage protection, under-voltage protection, and operation without external compensation. The integrated cycle-by-cycle current limit helps control peak inductor current, while over-voltage and under-voltage protection address abnormal operating conditions. Because this is a boost converter, inductor current, diode or rectification behavior, capacitor ripple, and the LED-string forward voltage determine efficiency and thermal stress. The 4 mm by 4 mm WQFN format supports compact LCD backlighting boards, although the exposed-pad thermal path and inductor layout remain critical. Typical uses include LCD monitor backlighting, dual-display illumination, notebook or portable-display lighting, instrument-panel lighting, and other white-LED strings requiring PWM dimming. Its two-output architecture is especially useful when both display strings need coordinated illumination, while a single large white-LED string can also be supported where the application permits. Designers should follow the manufacturer datasheet for the exact pin assignments, LED current-setting method, compensation-free control behavior, and recommended external components. Keep the switching loop compact, connect the exposed pad to the required ground plane, provide low-loop-inductance current paths, and verify LED brightness, thermal rise, ripple, dimming range, and fault behavior across input-voltage and temperature limits. This page consolidates verified distributor specifications, datasheet links, application guidance, and explicit data gaps without inventing missing electrical values.
LM3503ITL-35 - Dual 750mA LED Driver | Texas Instruments
The Texas Instruments LM3503ITL-35 is a dual-output constant-current white-LED driver with analog brightness control, PWM dimming, and a 750 mA switch rating, packaged in a 10-pin micro-SMD package measuring approximately 1.9 mm by 2.07 mm. According to the verified product data, it uses a PWM, step-up boost topology and operates across an 800 kHz to 1.2 MHz switching-frequency range. Its two regulated LED outputs are intended primarily for dual-display backlighting, where one driver can control two display illumination channels. An LED driver is a specialized power-management integrated circuit that converts a supply into the controlled current required by one or more LEDs. A constant-current LED driver regulates output current rather than voltage because LED brightness and reliability depend strongly on current. The boost topology supports LED strings whose forward-voltage requirement exceeds the available input voltage. Within the power-management hierarchy, the LM3503ITL-35 is an LED driver, which is a DC-DC regulator specialized for illumination loads. The verified data identifies two outputs, constant-current operation, analog brightness control, and PWM dimming as defining features. The switch rating of 750 mA provides a concrete current benchmark when sizing the converter, while the 800 kHz to 1.2 MHz frequency span places the device in a compact, high-frequency backlight-driver class. These features suit displays requiring separate illumination levels or coordinated dual-channel backlighting. Additional electrical limits, LED quantities, efficiency values, and dimming ratios were not supplied and therefore require verification in the manufacturer datasheet. The device combines a boost-converter function with dedicated constant-current LED regulation. Its two-output architecture reduces the number of separate lighting channels required on a compact display PCB. Analog brightness control provides a direct brightness-control path, while PWM dimming supports display illumination modulation. The small surface-mount package is appropriate for space-constrained portable equipment, but the exposed-pad connection, assembly requirements, thermal limits, and maximum power dissipation must be handled according to the official board-layout guidance. Typical uses include LCD module backlighting, dual-display portable equipment, tablet or instrument-panel illumination, and compact consumer products with two white-LED strings. For a portable system, the LM3503ITL-35 can generate the required LED current from a lower input voltage when configured as a boost converter. The designer must still confirm that the input source, inductor, diode, capacitors, feedback settings, and LED forward voltages support the intended strings. The principal design task is validating the verified 750 mA switch rating against actual LED-string current and thermal conditions. Component selection must account for startup behavior, switching losses, inductor saturation current, and layout inductance. Because detailed threshold, timing, and absolute-maximum data are unavailable in the supplied excerpts, consult the manufacturer datasheet before release to production. This page consolidates verified distributor specifications, sourcing information, replacement constraints, and practical design guidance. It also distinguishes confirmed electrical facts from parameters that still need manufacturer-documentation confirmation.
LM3535TME - 8-Output LED Backlight Driver | Texas Instruments
The Texas Instruments LM3535TME is an eight-output LED driver IC using a switched-capacitor charge-pump topology with PWM dimming and up to 25 mA per output. It is packaged in a 20-DSBGA measuring 2.04 mm by 1.78 mm and is designed for multi-display backlight systems. According to the verified manufacturer and distributor data, it also supports ambient light sensing and dynamic backlight control compatibility. An LED backlight driver is a specialized power-management and display-control IC that converts an available supply into regulated LED current. In the product hierarchy, an LED driver sits within LED Drivers, Power Management, and integrated circuits. Multi-display implementations must reproduce the desired panel brightness across multiple strings while providing a dimming mechanism and, when available, ambient-light response. The LM3535TME addresses these functions with eight parallel outputs and a switched-capacitor charge-pump topology. The verified feature set identifies eight constant-current LED outputs, PWM dimming, a 25 mA output-current rating, and a 20-DSBGA package. Driving eight LEDs in parallel makes the device relevant to compact LCD backlight systems where each output can correspond to a display LED group. PWM dimming provides a direct control method for adjusting brightness, while ambient-light sensing compatibility enables dynamic backlight-control strategies rather than fixed illumination. The charge-pump architecture is central to this part's operation. A switched-capacitor charge pump transfers energy through switched capacitors and can support LED backlighting where an inductive converter would add components. The verified data identifies the topology but does not provide a verified switching frequency, voltage range, output-voltage range, efficiency, or accuracy, so those values must be confirmed from the manufacturer datasheet before design release. Typical applications include multi-display LCD backlighting, portable electronics, automotive-style instrument clusters, and other systems requiring eight LED outputs with programmable brightness. Dynamic backlight operation is particularly relevant where an external light sensor and control policy can reduce illumination in dark environments and increase it under bright ambient conditions. PCB design should preserve the compact 20-DSBGA footprint and provide clean routing between the driver, LEDs, ambient-light interface, and control signals. Verify the official pinout and recommended external components before layout because the supplied verified data identifies the package but does not expose individual ball assignments. This page combines verified source data with transparent data-gap markers, application guidance, purchasing context, and replacement research. It does not invent missing electrical limits or pad a substitute list with parts that have not been verified as pin-to-pin and package compatible.
LM385M3X-1.2/NOPB - 1.235V Micropower Shunt Voltage Reference | Texas Instruments
The Texas Instruments LM385M3X-1.2/NOPB is a 1.235 V micropower two-terminal band-gap shunt voltage reference diode, supplied in a 3-pin SOT-23 (DBZ) surface-mount package. It operates over a 10 µA to 20 mA cathode current range with ±1 % to ±2 % initial output tolerance and a typical 1 Ω dynamic impedance, making it suitable for low-power precision analog designs. A shunt voltage reference is a two-terminal (cathode + anode) device that maintains a fixed reverse voltage across its terminals once biased above its minimum operating current, much like a temperature-compensated Zener diode. Shunt references sit within the broader hierarchy of voltage reference ICs, which in turn belong to power management and precision analog product families. They are commonly used as low-cost substitutes for buried-Zener or series-mode references in cost-sensitive, low-power applications. Key features include a 150 ppm/°C (max) low temperature coefficient, 1.235 V nominal output, an exceptionally low operating current floor of 10 µA that enables battery-life designs, and on-chip trimming for production-time accuracy. The DBZ SOT-23-3 footprint occupies roughly 7 mm² of PCB area and is compatible with TI's broader LMx85-1.2 reference family. The LM385-1.2-N series uses a band-gap architecture with on-chip trim, producing a stable 1.235 V reference across temperature. The 1 Ω dynamic impedance translates to less than 1 mV of additional error when cathode current varies by 1 mA, which is sufficient for ADC references, threshold detectors, and comparator-set switching thresholds. Typical applications include portable battery-powered meters, threshold detectors in comparator circuits, ADC reference rails in low-cost microcontrollers, and micropower regulators where the 1.235 V reference is amplified to higher rails. When designing with this part, pair it with a bias resistor sized to deliver 10 µA to 20 mA across the supply range. A 0.1 µF bypass capacitor across the reference often improves transient noise immunity. This page synthesizes distributor pricing, parametric comparison tables, drop-in alternatives and practical design notes not found in a single manufacturer datasheet, giving the engineer a one-stop reference for sourcing and qualifying the LM385M3X-1.2/NOPB.
LM385Z-1.2RAG - 1.235V Micropower Shunt Voltage Reference | onsemi
The onsemi LM385Z-1.2RAG is a micropower two-terminal bandgap shunt voltage reference diode that provides a fixed nominal output of 1.235 V with an initial tolerance of -2.4% to +2.01%, operating over a wide current range of 10 uA to 20 mA in a TO-92-3 (through-hole) package. Designed for ultra-low-power applications, the device guarantees a 1% initial voltage tolerance, 1 ohm dynamic impedance, and exceptional long-term stability over time and temperature. A shunt voltage reference is a two-terminal device that maintains a constant voltage across its terminals when biased with a current above its minimum operating point. Within the broader power management hierarchy, the LM385Z-1.2RAG belongs to the family of voltage reference ICs, which sit alongside voltage regulators, supervisors, and DC-DC converters as foundational analog building blocks. Bandgap-based shunt references such as the LM385Z-1.2RAG are valued for their low noise floor, stable temperature coefficient, and ability to operate from very low cathode currents, making them ideal for battery-powered systems where quiescent draw directly impacts battery life. Key features include a guaranteed 1% initial voltage tolerance, low dynamic impedance of 1 ohm, a temperature coefficient of 80 ppm/degree C typical, very low power consumption suitable for battery operation, and stable operation over time. The TO-92-3 through-hole package allows easy insertion into standard 0.1 inch pitch prototyping boards and is well suited to hand-soldered and wave-soldered assemblies in commercial-grade designs. From an architectural perspective, the LM385Z-1.2RAG uses a bipolar bandgap reference cell. On-chip trimming tightens the initial voltage tolerance, while the internal design minimizes dynamic impedance so that output voltage stays flat as cathode current varies. The wide operating current range (10 uA to 20 mA) gives designers flexibility to trade off power consumption versus reference stability, and the bipolar process technology delivers predictable temperature performance across the commercial 0 to 70 C range. Typical applications include portable meter references, portable test instruments, battery-operated systems, and current-loop instrumentation. The wide current range and low minimum operating current make it especially well suited to energy harvesting and remote sensor nodes where the reference must remain stable at microamp-level bias. When designing with the LM385Z-1.2RAG, ensure cathode current stays above 10 uA at all times and below 20 mA to remain within the guaranteed specification window. A bias resistor selected from the upstream supply sets the operating point, and a decoupling capacitor placed close to the device helps suppress noise on the reference rail. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single-page decision view for selecting and sourcing the LM385Z-1.2RAG.
LM4040AIM3-2.5/NOPB - 2.5V Shunt Voltage Reference | Texas Instruments
The Texas Instruments LM4040AIM3-2.5/NOPB is a precision micropower shunt voltage reference providing a fixed 2.5 V reverse breakdown voltage with ±0.1% initial accuracy (A-grade), 15 mA maximum cathode current, and 100 ppm/°C temperature coefficient in a 3-pin SOT-23 (DBZ) package. It belongs to the LM4040-N family of fixed-output band-gap shunt references. A shunt voltage reference is a two-terminal (plus a third pin for the SOT-23 package outline) analog building block that operates like a precision zener diode. When biased with a small current sourced through a series resistor from a higher supply rail, it produces a stable, low-noise reference voltage. Within the broader hierarchy, the LM4040 sits below adjustable references (e.g., LM4041) and series references (e.g., TL431) and above simple zener diodes, providing far better temperature stability, lower noise, and tighter initial tolerance for analog signal-chain design. Key features of the LM4040AIM3-2.5/NOPB include ±0.1% initial accuracy (A-grade), 100 ppm/°C maximum temperature coefficient, 45 µA typical cathode current, low dynamic impedance, and stable operation with any capacitive load - no external stabilizing capacitor is required. The fixed 2.5 V output is compatible with 12-bit and 16-bit ADC full-scale references and is a common system reference in mixed-signal designs. The device uses a band-gap core that compensates curvature across temperature, achieving 100 ppm/°C drift from -40 °C to +125 °C. The SOT-23-3 (DBZ) package is approximately 50% smaller than comparable SC70 packages from some second sources, freeing PCB area for space-constrained designs such as portable instrumentation. Typical applications include ADC/DAC reference rails, precision threshold detectors, battery monitoring in portable equipment, power-supply supervisory circuits, and loop control for industrial sensors. The fixed 2.5 V output maps directly onto many ADCs whose LSB quantization matches this reference. When biasing the LM4040AIM3-2.5/NOPB, choose a series resistor that supplies at least 45 µA at minimum cathode current and limits the current to under 15 mA across all input and temperature conditions. Place the device close to the load to minimize ground-loop noise. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, enabling faster selection and second-source qualification for production engineers.
LM4040B25FTA - 2.5V 0.2% Shunt Voltage Reference | Diodes Inc
The Diodes Incorporated LM4040B25FTA is a precision micropower shunt voltage reference that provides a fixed 2.5 V output with ±0.2% initial accuracy and a low 20 ppm/°C typical temperature coefficient, supplied in a 3-pin SOT-23 surface-mount package. The device operates as a two-terminal shunt reference over a 60 µA to 15 mA cathode current range and is stable with all capacitive loads, eliminating the need for an external compensation capacitor. It is rated for -40 to 125°C junction temperature operation, with a -40°C to 85°C ambient operating range, and supports AEC-Q100 automotive screening when ordered with the Q suffix (LM4040Q family). A shunt voltage reference is a two-terminal device that regulates voltage by steering excess current to ground, similar to a Zener diode but with much tighter initial accuracy, lower dynamic impedance, and a lower temperature coefficient. Shunt references belong to the broader voltage-reference category, sitting in the signal-chain hierarchy as the precision calibration source for ADCs, DACs, regulators, and instrumentation. They are typically biased by the load current itself or by a separate resistor from a higher supply rail, and they draw whatever current is necessary to hold VOUT constant. Key features include 4 mV typical cathode voltage tolerance, 1 mA test current for specification, very low dynamic impedance across the operating current range, and excellent long-term stability. The part is offered in industry-standard SOT-23-3 packaging with pinout that is compatible with TI LM4040 and TI LM4040-N families, simplifying second-source design. The Diodes Incorporated version is described by the manufacturer as a pin-for-pin compatible alternative to the TI LM4040 voltage reference. The internal bandgap reference cell and trimmed thin-film resistors deliver precision performance in a wide variety of operating conditions. The architecture is a low-noise bandgap with curvature correction and dynamic-element matching, which yields the low 20 ppm/°C drift and tight initial accuracy. This translates to reliable ADC measurement accuracy over temperature and simplifies the analog front-end calibration in instrumentation, where heavy switch-mode supply noise can degrade accuracy. Typical applications include ADC and DAC reference inputs, portable battery-powered equipment, notebook computers, cell phones, solar-powered systems, precision regulators, and automotive powertrain and chassis electronics where AEC-Q100 variants are required. The wide 60 µA to 15 mA cathode current range makes the LM4000B25FTA particularly well-suited for both low-power battery monitors and higher-current industrial loops. When designing with this part, choose the bias resistor so that the cathode current stays between 60 µA and 15 mA across all load and temperature conditions. The device is stable with any capacitor on the cathode, including 0 µF (no bypass), so PCB designers do not need to add a minimum ESR capacitor as a voltage reference, simplifying the BOM. For best noise performance, place the device close to the load and use a low-impedance ground return. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet.
LM4040D25FTA - 2.5V Shunt Voltage Reference, ±1%, 15mA
The Diodes Incorporated LM4040D25FTA is a precision micropower shunt voltage reference that provides a fixed 2.5 V output with ±1% (D-grade) initial accuracy in a 3-pin SOT-23 surface-mount package. It operates as a two-terminal shunt reference over a 60 µA to 15 mA cathode current range, dissipating up to 330 mW, and uses a bandgap core that is highly tolerant of capacitive loads so no output capacitor is required. The LM4040D25FTA is pin-for-pin compatible with the legacy LM4040-2.5 family and offers low dynamic impedance of typically 0.5 ohm at 1 mA. A shunt voltage reference is a two-terminal device that behaves like a precision zener diode: current flows through it in the reverse direction and the device holds its terminal voltage constant over a wide range of operating current. Compared with a series (3-terminal) reference such as the TL431, the LM4040 is simpler — no feedback resistors, no minimum dropout voltage drop across a series pass element — and is the standard building block for power management ICs -> voltage references -> shunt references. Its sub-1 mA quiescent capability makes it ideal for battery-powered and micropower designs. Key features include ±1% initial tolerance at +25 °C (D-grade), typical 20 ppm/°C temperature coefficient, 45 µVrms output noise (10 Hz to 10 kHz), and excellent line/load stability. The SOT-23-3 footprint occupies roughly 8 mm² of board area, making the device the smallest precision reference in the LM4040 family. Operating temperature range is -40 °C to +85 °C (commercial) or -40 to +125 °C (automotive Q-grade, see LM4040Q datasheet). Architecturally, the LM4040 uses a curvature-compensated bandgap reference with on-chip op-amp buffering, then presents the buffered reference at the cathode pin. The two-terminal topology is the simplest reference architecture: the user simply chooses a series resistor from the supply rail, sized so that the worst-case quiescent and load current together keep the device above 60 µA and below 15 mA across temperature. Because the bandgap loop is internally compensated, the device is unconditionally stable with 0 nF to 10 µF of load capacitance — a major advantage over many 3-terminal LDOs repurposed as references. Typical applications include ADC and DAC reference inputs, precision threshold detectors, solar/battery monitoring circuits, instrumentation loop power, and as a precision reference for 4-20 mA loops. Designers should also use the LM4040 as a stable pull-up for opto-isolators or as a low-noise reference for portable instrumentation where TL431 quiescent current is excessive. For audio or RF signal chains the 45 µVrms noise is adequate for most 16-bit systems; for higher resolution consider the LT1460 or ADR45xx families. When designing with this device, calculate the series resistor for worst-case supply, load, and temperature so the LM4040 stays above 60 µA and below 15 mA. A 1 mA midpoint with a 5 V supply and 2.5 V reference drops 2.5 V across a 2.5 kΩ resistor, dissipating 2.5 mW. Reverse-polarity protection on the supply side is recommended if the input can be replaced. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LM46000PWPR - 60V 0.5A Sync Step-Down Converter | Texas Instruments
The Texas Instruments LM46000PWPR is a SIMPLE SWITCHER 3.5V to 60V, 500mA synchronous step-down DC-DC converter housed in a 16-pin HTSSOP-EP (PWP) power package with an exposed thermal pad. It integrates both high-side and low-side MOSFETs and uses peak current-mode control to deliver exceptional efficiency, output accuracy, and dropout performance in a compact solution footprint. A buck (step-down) DC-DC converter is a switching regulator that converts a higher DC input voltage to a lower DC output voltage with high efficiency by rapidly switching an internal MOSFET and storing energy in an external inductor and capacitor. The synchronous topology replaces the traditional freewheeling diode with a second MOSFET, reducing conduction loss and improving efficiency, especially at higher output currents. Buck converters sit within the broader power management IC hierarchy: switching regulator -> DC-DC converter -> power management IC -> semiconductor device, and are the dominant topology for non-isolated point-of-load regulation in industrial, automotive, and consumer systems. The LM46000PWPR features 24 µA quiescent current in regulation, high efficiency at light load via DCM/PFM operation, an adjustable switching frequency range of 200 kHz to 2.2 MHz (500 kHz default), and an adjustable output voltage of 1V to 28V. It meets EN55022/CISPR 22 EMI standards, supports a wide 3.5V to 60V input range, and provides cycle-by-cycle current limiting, thermal shutdown, and an externally synchronizable RT/_SYNC pin. The HTSSOP-EP package's exposed pad yields a low junction-to-ambient thermal resistance for reliable operation at full 500mA load across the input range. Typical applications include industrial 24V/48V sensor and actuator rails, factory automation PLC I/O, automotive infotainment and body electronics (non-safety), battery-powered portable instrumentation, and distributed POL (point-of-load) regulation in telecom/datacom systems. The wide 60V input tolerance allows direct connection to rectified AC inputs and 48V telecom rails without upstream protection. When designing with this device, select the inductor based on the chosen switching frequency to keep ripple current at 20-40% of IOUT, and place the input ceramic bypass capacitor within 5mm of the PVIN and PGND pins. The PGND and AGND planes must be joined at a single point near the exposed pad to minimize switching-noise coupling into sensitive analog circuits. This page synthesizes distributor pricing from DigiKey, Mouser, and LCSC as of 2026-10-08, plus parametric drop-in alternatives (LM46001, LM46002, LM43603, LMR16006) and practical design notes that go beyond the manufacturer datasheet.
LM46001PWPR - 60V 1A Synchronous Step-Down Converter | TI
The Texas Instruments LM46001PWPR is a 3.5 V to 60 V, 1 A synchronous step-down (buck) DC-DC converter housed in a 16-pin HTSSOP (PWP) power package with an exposed thermal pad. It integrates both high-side and low-side MOSFETs, supports adjustable output voltages down to 1 V, and operates at a default switching frequency of 500 kHz (adjustable from 200 kHz to 2.2 MHz). The part is qualified for -40 °C to +125 °C operation and targets industrial, automotive, and distributed-power applications. A buck (step-down) DC-DC converter is a switching regulator that uses an inductor to transfer energy from input to output at a lower voltage with high efficiency. Unlike linear regulators that dissipate (VIN - VOUT) × IOUT as heat, a buck converter PWM-switches the input and filters the result with an LC network, yielding efficiencies typically above 90 percent. The LM46001 family belongs to TI's SIMPLE SWITCHER portfolio and sits in the broader hierarchy of switching regulators -> DC-DC converters -> power management ICs -> semiconductors. Key features include 24 µA quiescent current in regulation, high light-load efficiency via DCM and PFM modes, EN55022/CISPR 22 EMI compliance, integrated synchronous rectification, and adjustable switching frequency. A PGOOD flag, enable pin, and internal soft-start complete the feature set. The HTSSOP-16 (PWP) power package has a thermal pad that keeps junction temperature manageable at the 1 A output level. The device uses peak-current-mode control for simple loop compensation, fast transient response, and cycle-by-cycle current limiting. Its wide 3.5 V to 60 V input range is achieved with internal 65 V tolerant switches, eliminating the need for external protection components in 24 V industrial or 48 V telecom rail systems. Typical applications include industrial 24 V/48 V rails, automotive infotainment and body electronics, eMMC/SSD POL supplies, battery-powered portable equipment, and HVAC or factory-automation nodes. The 500 kHz default allows compact inductors and ceramic output capacitors. When designing with this part, select an inductor with saturation current at least 30 percent above the peak switch current and place input ceramic bypass capacitors within 3 mm of the PVIN pins to minimize ringing and EMI. This page synthesizes distributor pricing as of 2026-10-08, drop-in pin-compatible alternatives from the LM436xx and LM4600x families, and practical design notes not consolidated in the manufacturer datasheet.
LM46001PWPT - 60V 1A Sync Step-Down Converter | Texas Instruments
The Texas Instruments LM46001PWPT is a SIMPLE SWITCHER® synchronous step-down DC-DC converter capable of driving up to 1A of load current from a 3.5V to 60V input rail, housed in a 16-pin HTSSOP (PWP) package with PowerPAD exposed thermal pad. The device delivers an adjustable output from 1V to 28V with 24 µA quiescent current in regulation, making it one of the lowest-Iq wide-Vin synchronous bucks in its class. A buck (step-down) converter is a type of switching DC-DC regulator that reduces a higher input voltage to a lower, regulated output voltage by alternately storing energy in an inductor and releasing it into the load. Buck converters sit within the power management IC hierarchy (DC-DC converter -> switching regulator -> voltage regulator) and are the workhorse topology for any system that must derive a sub-rail from a higher bus. Synchronous implementations integrate both the high-side and low-side MOSFETs to maximize efficiency, especially at light loads, and to eliminate the need for an external Schottky diode. The LM46001PWPT integrates 24 µA Iq in regulation, high efficiency at light load via DCM and PFM operation, EN55022/CISPR 22 EMI compliance, an adjustable switching frequency from 200 kHz to 2.2 MHz (500 kHz default), and internal synchronous rectification that removes the external Schottky. Peak-current-mode control simplifies loop compensation and provides cycle-by-cycle current limiting. The HTSSOP-16 (PWP) PowerPAD package keeps theta-JA low enough to dissipate 1A at 60V in industrial environments without a discrete heatsink. The device is pin-to-pin compatible with the 0.5A LM46000 and 2A LM46002 in the same HTSSOP-16 footprint, giving designers a one-PCB layout that scales across load points. It is also AEC-Q100 qualified under the LM46001-Q1 part number for automotive 12V/24V systems. Typical applications include industrial 24V/48V sensor rails, telecom point-of-load, automotive infotainment, eMeters, battery-powered equipment, and HVAC controllers. A 1 µF ceramic bypass on BP, plus inductor and output ceramic capacitor selection per WEBENCH, is sufficient for a complete 1A design. When laying out the PCB, place the input ceramic, bootstrap capacitor, and output ceramic as close to the IC as possible and tie the PowerPAD to a continuous ground pour to achieve the datasheet thermal performance. For wide-Vin industrial rails, the 60V abs-max transient tolerance removes the need for upstream TVS in most 24V and 48V systems. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
LM5008AMM/NOPB - 100V 350mA Buck Regulator | Texas Instruments
The Texas Instruments LM5008AMM/NOPB is a 350-mA constant on-time (COT) non-synchronous buck switching regulator housed in an 8-pin VSSOP (DGK) package, with an integrated 100-V N-channel MOSFET and an input voltage operating range of 6 V to 95 V (LM5008A version; the non-A version starts at 9 V). A buck regulator (also called a step-down switching regulator or step-down converter) is a switch-mode DC-DC converter that produces a lower regulated DC output voltage from a higher DC input voltage with high efficiency by rapidly switching an internal power MOSFET and storing energy in an external inductor and capacitor. Within the broader power management hierarchy, a buck regulator sits under switching regulators -> DC-DC converters -> power management ICs (PMICs) -> semiconductors. The constant on-time (COT) control architecture eliminates the need for external loop compensation, simplifies design, and provides excellent line and load transient response. Key features of the LM5008AMM/NOPB include an integrated 100-V N-channel buck switch, internal startup regulator, ultra-fast transient response with no loop compensation required, an adjustable output from 2.5 V to 75 V, and a 350-mA continuous load capability. On-time varies inversely with input voltage (feed-forward), giving near-constant ripple at varying line. The device also incorporates cycle-by-cycle current limit, thermal shutdown, and an enable/UVLO pin for input-side monitoring and sequencing. The 8-pin VSSOP package keeps outboard supplies below 1 square inch of PCB area, while a thermally enhanced 8-pin WSON variant (LM5008AMWC/NOPB) is offered for higher-power designs. Typical applications include 24-V/48-V industrial bus regulation, telecom secondary-side point-of-load conversion, HVAC and appliance subsystems, battery-powered equipment down-conversion, and bias supplies for gate drivers. The wide 6 V–95 V input tolerance tolerates 24-V industrial transients and 48-V telecom rails without front-end protection. When designing with the LM5008AMM/NOPB, select the on-time programming resistor (RT) using the RT = (VIN × 6.15 ns × (VOUT/1.235 V)) / (1 µs × 1 µF) approximation from the datasheet, and place the bootstrap capacitor and feedback divider as close to the IC as practical. This page consolidates distributor pricing, same-package alternatives, comparison data and engineering notes that supplement the manufacturer datasheet.
LM5013DDAR - 100V, 3.5A Buck Converter | Texas Instruments
The Texas Instruments LM5013DDAR is a 100-V input, 3.5-A non-synchronous buck DC/DC converter housed in an 8-pin SO PowerPAD package. It integrates a 100-V, 0.25-ohm high-side power MOSFET, supports an adjustable output from 1.2 V, and operates across a junction temperature range of -40C to +125C. A buck converter (step-down switching regulator) is a power management IC that converts a higher DC input voltage to a lower DC output voltage using a controlled switching element, an inductor, and output filtering. Buck converters sit within the broader hierarchy of switching regulators -> DC/DC converters -> power management ICs -> semiconductors, and are distinguished from linear regulators (LDOs) by their high efficiency across wide VIN/VOUT ratios. Key features include a wide 6-V to 100-V input range that minimizes the need for external surge suppression, a 50-ns minimum controllable on-time that enables large step-down ratios (e.g., direct 48-V to low-voltage rail conversion), a constant on-time (COT) control architecture for fast transient response, integrated input UVLO, peak current-limit protection, thermal shutdown, a 3.5-ms fixed internal soft-start, and an open-drain PGOOD indicator for fault reporting and sequencing. The COT control scheme uses a comparator-delay timer on the high-side power switch to set the on-time, eliminating the loop compensation network required by traditional peak/current-mode controllers. The integrated 0.25-ohm high-side MOSFET minimizes conduction losses, while the 50-ns minimum on/off time allows extreme step-down ratios without duty-cycle saturation. Typical applications include industrial 24-V/48-V bus regulation, telecommunications equipment, battery charging, and HVAC systems. In 48-V telecom systems the LM5013DDAR can step directly down to 3.3-V or 5-V loads, replacing two-stage converter designs. When selecting a buck converter for high-voltage inputs, verify the IC's input rating (100 V here) exceeds the worst-case transient on the rail, and confirm that the minimum on-time supports your VIN - VOUT ratio at the target switching frequency. Use the SO PowerPAD thermal pad for heat dissipation and connect it to a sufficient copper area.
LM5013DDART - 100V 3.5A Non-Sync Buck DC/DC Converter | TI
The Texas Instruments LM5013DDART is a 100-V input, 3.5-A non-synchronous buck DC/DC converter housed in an 8-pin SO PowerPAD (DDA) package with exposed thermal pad. It operates from a wide 6 V to 100 V input range, regulates an adjustable output from 1.2 V upwards, and delivers up to 3.5 A of continuous load current. The 50 ns minimum controllable on-time enables very large step-down conversion ratios directly from 48-V or higher rails. A buck converter (also called a step-down switching regulator) is a switch-mode power supply topology that uses an inductor as the primary energy-storage element and a transistor switch to chop the input voltage, then filters it with the LC network to produce a lower, regulated DC output. The buck converter belongs to the broader family of DC-DC converters within the voltage-regulator hierarchy: DC-DC converter -> switching regulator -> power management IC -> semiconductor. Because the LM5013 integrates the high-side switch and uses a non-synchronous rectifier (external diode), designers trade synchronous-rectifier efficiency for simplified BOM and lower cost at high input voltages. Key specifications include 6 V to 100 V input range, 1.2 V adjustable output, 3.5 A continuous load current, 50 ns minimum on-time, integrated 3.5 ms internal soft-start, input UVLO with thermal shutdown, and peak current-limit protection. The SO PowerPAD package gives a low thermal resistance (approximately 40 C/W) so a moderate copper pour supports full 3.5-A operation. The junction-temperature range of -40 C to +125 C supports industrial and automotive-grade designs (the LM5013-Q1 automotive variant is also available). Architecturally, the LM5013 uses peak-current-mode control for fast line transient response and simple loop compensation. A 50 ns minimum on-time enables direct step-down from 100 V to 1.2 V at high switching frequency, reducing solution size. The internal 3.5 ms soft-start eliminates inrush current at power-up and simplifies sequencing in multi-rail systems. Typical applications include industrial 24-V and 48-V bus regulation, factory-automation PLC I/O rails, automotive body-electronics (via the LM5013-Q1), PoE powered-device auxiliary rails, battery-charging front ends, and high-voltage LED lighting. The wide VIN makes it a natural fit anywhere a high-voltage rail must be dropped to a low-voltage logic or analog supply. When designing with the LM5013, choose an external Schottky diode with reverse voltage at least 1.3x VIN(max) and sized to carry the full load current plus ripple. Use a low-ESR ceramic input capacitor to filter the switching spikes, and route the SW node as a small, tight loop to minimize EMI.
LM5017MR - 100V 600mA Sync Buck Regulator | Texas Instruments
The Texas Instruments LM5017MR is a 100V, 600-mA constant on-time (COT) synchronous buck regulator with integrated 100V high-side and low-side MOSFETs, housed in an 8-pin HSOP EP (SO PowerPAD) package. It accepts a wide 7.5V to 100V input range and delivers an adjustable output from 1.225V up to 90V, eliminating the need for an external Schottky diode. A buck (step-down) switching regulator is a DC-DC converter that efficiently reduces a higher DC rail to a lower DC rail by periodically switching an inductor-capacitor filter network. Buck regulators sit within the broader power management IC hierarchy of linear regulators -> voltage regulators -> DC-DC converters -> power management ICs -> integrated circuits. Compared with LDOs, buck regulators achieve much higher efficiency at large input-to-output differentials because they do not dissipate VIN-VOUT as heat; this makes the buck topology essential for 48V telecom rails, industrial 24V/36V/48V bus systems, and battery stacks where thermal dissipation would otherwise be impractical. Key features of the LM5017MR include a wide 7.5V-100V input range, integrated 100V high-side and low-side switches that eliminate an external Schottky diode, and a precision enable/UVLO with adjustable threshold. The constant on-time control architecture requires no loop compensation, provides ultra-fast transient response, and maintains nearly constant operating frequency. Adjustable switching frequency up to 1MHz, intelligent peak current limit, and a precision 2% feedback reference round out the feature set. The HSOP EP package exposes the thermal pad for direct copper heat-sinking, critical at high input voltages where the high-side switch dissipation is non-trivial. The constant on-time (COT) architecture uses a one-shot timer triggered by the feedback voltage falling below the internal reference, turning the high-side MOSFET on for a fixed on-time determined by VIN and a programming resistor. This produces a nearly constant frequency without the need for compensation components, dramatically simplifying PCB design and improving transient response compared with traditional voltage-mode or current-mode PWM controllers. The integrated 100V synchronous switches reduce BOM cost and PCB area, while the 1MHz maximum operating frequency enables small magnetic sizing. According to TI application notes, the LM5017 is also widely used in isolated Fly-Buck topologies for generating auxiliary rails in IGBT gate-drive and industrial PLC systems. Typical applications include 48V telecom point-of-load conversion, industrial 24V/36V/48V bus regulation, automotive 12V/24V battery-powered systems, bias supplies for IGBT gate drivers, isolated Fly-Buck converters, and PoE (Power over Ethernet) PD regulation. The wide VIN range and integrated switches make it particularly attractive for distributed power systems where the input rail can vary from 18V to 80V during transients. When designing with the LM5017MR, pay close attention to PCB layout: the RTN pin is the substrate ground and the exposed thermal pad must be soldered to a sufficiently large copper pour to keep junction temperature below the 125C operating lifetime de-rating. Use a low-ESR ceramic input capacitor rated for the full 100V input transient, and follow the datasheet's recommended inductor and feedback resistor values for the target output. The RT pin's on-time programming resistor sets frequency and must be selected based on VIN and VOUT. This page synthesizes distributor pricing, drop-in alternatives including the LM5017MR/NOPB RoHS variant and same-package TI wide-Vin buck family members, and practical design notes not found in the standalone datasheet PDF.
LM5069MM-1/NOPB - 80V Hot Swap Controller, Latch-Off | TI
The Texas Instruments LM5069MM-1/NOPB is a 9V-to-80V positive hot-swap / inrush current controller with power limiting, housed in a 10-pin VSSOP (DGS) package and rated for -40C to +125C operation. It integrates the analog control loop for driving an external N-channel MOSFET across a wide operating voltage range, with internal charge pump, programmable current limit, and a circuit-breaker / latch-off fault response that disables the pass FET after a fault detection. A hot-swap controller is a specialized power-management integrated circuit that controls the inrush current when a printed circuit board is inserted into a live backplane, allowing the bulk capacitors on the board to charge safely while protecting the connector, the MOSFET pass element, and the upstream supply from stress. Hot-swap controllers sit within the broader hierarchy of power-management ICs, between upstream OR-ing controllers / eFuses and downstream point-of-load (POL) regulators. The LM5069 family specifically addresses positive high-voltage rails up to 80V, making it a key building block in -48V telecom, 24V industrial, and 12V/24V/48V distributed-bus systems. Key features include a 9V-to-80V operating range, 100V absolute maximum on VIN, programmable current limit with external sense resistor, programmable inrush dV/dt control, programmable undervoltage and overvoltage lockout with hysteresis, power-limiting foldback during startup, and a fault timer. The LM5069-1 variant latches off after a fault, requiring manual reset, while the LM5069-2 variant auto-restarts at a fixed duty cycle. Architecturally, the LM5069 uses an internal charge pump to drive the external N-FET gate above VIN, an external sense resistor (RSENSE) for cycle-by-cycle current sensing, and a transconductance amplifier that closes the loop on the inrush profile. The TIMER pin capacitor sets the fault integration period, while the UVLO/OVLO dividers on the EN / UVLO pin set the input voltage window. Compared to discrete inrush solutions, the LM5069 reduces BOM count, improves fault repeatability, and provides telemetry-grade protection that meets the requirements of telecom (NEBS) and industrial (IEC 61131-7-1) hot-swap cards. Typical applications include -48V telecom line-card hot swap, 24V industrial PLC and motor-drive bus protection, 12V/24V/48V battery-backed server and storage hot swap, RAID / disk-array plug-in cards, and ATCA / AdvancedTCA payload boards. Designers choose the LM5069 family for its combination of wide operating voltage, power limiting during startup transients, and industry-standard 10-pin VSSOP footprint. When designing with this part, select the external RSENSE to set the circuit-breaker threshold and the GATE dV/dt capacitor to control inrush current. The TIMER capacitor value sets the fault integration window: too short can nuisance-trip on benign transients, too long can allow sustained overcurrent. Always verify SOA of the external pass MOSFET under worst-case hot-plug at minimum VIN. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including cross-brand pin-compatibility notes for Analog Devices and Maxim Integrated parts.
LM5069MM-2/NOPB - 80V Hot Swap Controller w/ Power Limit | TI
The Texas Instruments LM5069MM-2/NOPB is a positive high-voltage hot-swap / inrush current controller with power limiting, operating across a 9V to 80V input range and packaged in a 10-pin VSSOP (DGS). The -2 suffix designates auto-restart fault behavior after a fault detection, while the -1 sibling latches off instead, both sharing the same die and footprint. What is a hot-swap controller? A hot-swap controller is a power-management IC that allows a circuit board to be inserted into a live backplane without drawing inrush currents large enough to damage connectors, blow fuses, or collapse the upstream rail. It drives an external N-channel MOSFET in the high-side path and combines programmable inrush current limiting, power limiting, undervoltage/overvoltage lockout, and a fault timer. Hot-swap controllers belong to the wider power-management hierarchy: hot-swap controller -> hot-swap & power distribution -> power management IC -> semiconductor. Key features include programmable current limit set by an external sense resistor, a 0.7-ms internal fault timer that distinguishes inrush from sustained fault, independent OV/UV thresholds with hysteresis, a power-good indicator, and a board-insertion delay. The DGS VSSOP package occupies roughly the same board area as a 10-pin MSOP while providing enhanced thermal performance for the dissipation levels encountered in -48V telecom and 24V industrial rails. The device uses a transconductance control loop with a dv/dt circuit on GATE, charging the MOSFET gate with a programmable current source to ensure monotonic rail ramp. Power limiting is implemented by measuring the voltage across the sense resistor multiplied by VIN, giving a true input-power limit rather than a simple current foldback, which protects the upstream supply during capacitive or short-circuit events. The LM5069-2 auto-restart behavior retries every 220 ms (typical) after a fault, ideal for transient overload recovery. Typical applications include -48V telecom plug-in cards, 24V/48V industrial automation modules, blade servers and ATCA front-end boards, battery exchange modules in UPS systems, and PoE midspan power insertion. The wide 80V input range also tolerates load-dump transients on 24V automotive and heavy-industrial buses. A design consideration worth highlighting: the LM5069MM-2/NOPB differs from the LM5069MM-1 by auto-restart rather than latch-off after faults. Selection should reflect whether the system requires operator intervention (latch) or unattended recovery (auto-restart). PCB layout should keep the sense-resistor trace short and Kelvin-connected to the CS pin to avoid ground bounce from corrupting the current measurement. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone, including a head-to-head comparison with the LM5069MM-1 and TPS2490DGS in the same VSSOP-10 footprint.
LM5070MTC-50 - PoE PD Interface & PWM Controller | TI
The Texas Instruments LM5070MTC-50 is an integrated Power over Ethernet (PoE) Powered Device (PD) interface and current-mode PWM controller with an 80V, 400mA internal line connection switch, a 580 kHz oscillator, a 6.25V UVLO threshold, and a 16-pin TSSOP package rated from -40C to +125C. A PoE PD interface controller is the front-end circuit that lets a networked device safely draw power over the Ethernet cable itself. Within the power management hierarchy, it sits between the Ethernet port and the isolated DC-DC converter, performing classification, inrush limiting, and undervoltage lockout before handing a regulated bus to the switching stage. The LM5070 integrates this interface and the PWM modulator on one die, eliminating discrete PD interface ICs. Key features include full IEEE 802.3af compliance with integrated detection, classification, and inrush current control; an integrated 80V, 400mA pass switch that handles the line-connection sequencing; and a full-featured current-mode PWM controller supporting flyback and other isolated topologies for converting the 48V PoE input rail to system voltages. Technically, the device combines the PD interface state machine with a current-mode PWM engine operating at a nominal 580 kHz, allowing compact transformer designs. The 80V switch rating provides ample margin above the 48V nominal PoE voltage, including transient headroom, and the adjustable UVLO threshold (6.25V reference for the -50 variant) enables precise power-good detection. Typical applications include IP security cameras, VoIP phones, wireless access points, and any IEEE 802.3af-powered network endpoint needing an integrated PD front end plus converter control. Design consideration: verify the UVLO setting and external N-channel MOSFET sizing for the downstream converter, since the PWM controller drives an external power stage; thermal and inrush behavior should be validated at maximum cable length where series resistance is highest. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LM5070MTC-80/NOPB - PoE PD Controller 80V TSSOP-16 | TI
The Texas Instruments LM5070MTC-80/NOPB is an integrated Power over Ethernet (PoE) Powered Device (PD) interface and PWM controller that combines an 80 V, 400 mA line connection switch with a full-featured current mode PWM controller in a 16-pin TSSOP (PW) package, supporting supply operation from 1.8 V to 75 V and up to 13 W of classified PoE power per IEEE 802.3af. A PoE PD controller is the interface IC that sits between the Ethernet cable's powered line and the downstream DC-DC converter of a powered device such as an IP camera, wireless access point, or VoIP phone. Within the power-management IC hierarchy, it belongs to the PoE controller family (power interface controllers), which handles detection, classification, and inrush control before handing power to the converter stage. The IEEE 802.3af standard defines the detection signature, classification currents, and under_voltage lockout thresholds that such a device must meet. Key features include the integrated 80 V, 400 mA pass switch with controlled inrush limiting, fully IEEE 802.3af compliant detection and classification, a current mode PWM stage with up to 1 MHz maximum switching frequency, 80% maximum duty cycle, and adjustable under-voltage lockout. Integration of the PD front end and PWM controller in one package reduces board area, external component count, and overall system bill-of-materials cost. Architecturally, the LM5070 pairs the PoE line-interface section (signature resistor, classification, inrush, and thermal protection) with a current mode PWM controller suited to flyback or buck-derived isolated and non-isolated topologies. The 80 V rated internal switch covers the transient environment of long Ethernet runs, while the PWM section provides cycle-by-cycle current limiting and programmable oscillator frequency up to 1 MHz for compact magnetics. Typical applications include IEEE 802.3af powered IP security cameras, 802.11 wireless access points, VoIP telephones, network-attached access control terminals, and any PoE-powered endpoint converting 48 V Ethernet power into system rails. Design consideration: because the internal connection switch is rated 80 V and 400 mA, ensure inrush energy and load capacitance stay within the datasheet limits and keep the converter duty cycle below the 80% maximum to avoid runaway in flyback designs. This page adds value beyond the datasheet by synthesizing distributor availability data, verified drop-in alternative analysis, and practical design notes for the LM5070MTC-80/NOPB in one reference.
LM5085QMYE/ - 75V PFET Buck Controller | Texas Instruments
Texas Instruments LM5085QMYE/ is a high-voltage constant-on-time PFET buck switching controller with a 4.5 V to 75 V input range, switching frequency programmable up to 1 MHz, and an 8-HVSSOP exposed-pad package. The automotive-qualified LM5085-Q1 variant is AEC-Q100 Grade 1 qualified for operation from -40°C to 125°C junction temperature. This controller is designed to simplify high-efficiency step-down regulator development using an external PFET, inductor, and feedback network. A buck switching controller is a type of DC-DC converter controller that drives an external switching element to reduce a higher input voltage to a regulated lower voltage. The LM5085 belongs to the power-management hierarchy: buck regulator controller, DC-DC switching controller, and power-management IC. Its PFET gate driver and constant-on-time control principle enable high-voltage operation without the complexity of an actively driven high-side N-channel MOSFET. Key features include a wide 4.5 V to 75 V operating input range, 100% maximum duty-cycle capability, adjustable current limiting using either the PFET RDS(ON) or a current-sense resistor, and cycle-by-cycle current limiting. The controller includes a built-in high-voltage bias regulator and PFET gate driver. According to the Texas Instruments LM5085 product information, the device offers nearly constant operating frequency with line and load variation. The constant-on-time architecture avoids loop compensation and is intended to provide an ultrafast transient response. Switching frequency can be programmed up to 1 MHz, allowing designers to select between smaller magnetics, higher switching rates, or lower switching losses. The PFET drive arrangement supports simplified gate-drive requirements and extends regulation range through 100% duty-cycle operation at low input voltage. Typical applications include industrial 24 V or 48 V bus step-down supplies, automotive electrical-control units, telecom and networking equipment, test and measurement instruments, and high-voltage battery-derived power rails. The controller operates with external power components, so final output current, efficiency, ripple, and thermal performance depend on the selected PFET, inductor, capacitors, and PCB layout. For robust implementation, place the controller and high-current switching loop tightly, maintain a compact high-dv/dt gate-drive path, use adequate input and output capacitance, and verify current-limit behavior across VIN, load, and temperature. This page combines manufacturer information, distributor availability, application guidance, and design-focused considerations for engineers evaluating the LM5085-Q1 family.
LM5085QMYE/NOPB - 75V PFET Buck Controller, AEC-Q100 | TI
The Texas Instruments LM5085QMYE/NOPB is a 4.5V to 75V wide-input, constant on-time (COT), non-synchronous PFET buck (step-down) DC-DC switching controller in an 8-pin HVSSOP (DGN) exposed-pad package, qualified to AEC-Q100 Grade 1 for automotive applications. The part is specified for junction temperatures from -40°C to +125°C, and uses the constant on-time control principle to deliver ultra-fast transient response with no loop compensation required. The PFET topology enables 100% duty cycle operation, extending regulation headroom at low input voltages. What is a buck controller? A buck controller is a type of DC-DC switching controller that, paired with an external power MOSFET and inductor, steps a higher DC input voltage down to a lower regulated output voltage. Within the power management IC hierarchy, it sits above simple LDOs and below fully integrated point-of-load (POL) converters: LDO -> buck controller -> DC-DC converter -> power management IC. The COT (constant on-time) variant eliminates the traditional error amplifier and PWM modulator, instead using a one-shot on-timer that produces a nearly constant switching frequency across line and load variations. Key features include a wide 4.5V to 75V operating input range, adjustable current limit using either the external PFET's RDS(on) or a dedicated current-sense resistor, programmable switching frequency up to 1 MHz, cycle-by-cycle overcurrent protection, and a built-in LDO regulator that powers internal circuitry. The device also provides an enable pin for power sequencing and an internal 7V gate-drive clamp that protects the external PFET. The HVSSOP-8 exposed-pad package provides a low thermal resistance path to the PCB copper pour. Architecturally, the LM5085 uses an adaptive on-timer whose pulse width is set by an external resistor (RTON) and inversely proportional to VIN, producing a near-constant frequency across the input range. This approach yields a feed-forward control loop that is inherently stable without compensation components, dramatically simplifying design-in compared to traditional voltage-mode or peak-current-mode controllers. The current-limit comparator monitors the voltage across the external PFET or a sense resistor on every cycle and terminates the on-pulse to protect the converter from short-circuit and overload events. Typical applications include automotive infotainment and instrument-cluster rails, 24V industrial sensor supplies, point-of-load conversion from 48V telecom rails, LED driver front-ends, and battery-powered systems requiring high step-down ratios. The wide Vin and 100% duty cycle operation also make the part well suited to cold-crank and load-dump scenarios in 12V/24V automotive electrical systems. When designing with the LM5085, choose the external PFET's VDS rating to comfortably exceed maximum VIN plus margin (typically 100V for a 75V nominal design), and size the current-sense resistor to trip at no more than 120% of the design load. The exposed pad must be soldered to a sufficiently large copper pour to keep the junction within its 125°C rating at full power. This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives (same-brand and cross-brand), and practical design notes that are not available in the manufacturer datasheet alone.