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LD1117S33TR - 800mA Low Dropout Positive Regulator | STMicroelectronics
The STMicroelectronics LD1117S33TR is a low dropout positive voltage regulator providing a fixed 3.3V output with a maximum output current of 800mA. It is available in the SOT-223 package, designed for surface mount applications. The device operates with an input voltage range up to 15V and features a typical dropout voltage of 1.1V at 800mA load. Data verified as of 2026-08-05. A low dropout regulator (LDO) is a type of linear voltage regulator that can maintain a stable output voltage even when the input voltage is very close to the output voltage, minimizing power dissipation. LDOs are essential in power management ICs, providing clean, low-noise supply rails for sensitive analog and digital circuits. The LD1117S33TR belongs to the LD1117 family, which includes adjustable and fixed output versions, and is widely used in consumer, industrial, and automotive applications. Key features of the LD1117S33TR include a fixed 3.3V output, 800mA output current capability, internal current limiting, and thermal shutdown protection. The device offers a typical dropout voltage of 1.1V at full load, ensuring efficient operation even with low input-to-output voltage margins. The SOT-223 package provides a compact footprint with a thermal pad for improved heat dissipation, making it suitable for space-constrained designs. The LD1117S33TR utilizes a PNP pass transistor architecture, which allows for low dropout operation and stable performance across a wide range of load currents. The internal current limiting and thermal shutdown features protect the device and the load from fault conditions. The device is stable with low ESR ceramic capacitors, simplifying the external component count and reducing board space. Typical applications include post-regulation for switching power supplies, battery-powered equipment, and as a local supply rail for microcontrollers, FPGAs, and analog circuits. The fixed 3.3V output is ideal for powering 3.3V logic and mixed-signal systems. The wide input voltage range and robust protection features make it suitable for industrial control systems and consumer electronics. When designing with the LD1117S33TR, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. The dropout voltage increases with load current, so a minimum input voltage of 4.4V is recommended for a 3.3V output at 800mA. Proper PCB layout with adequate copper area for heat dissipation is essential for reliable operation at high load currents. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the STMicroelectronics datasheet, providing engineers with a comprehensive resource for selecting and implementing the LD1117S33TR.
LD1117S50TR - 800mA Low Dropout Positive Regulator | STMicroelectronics
The LD1117S50TR is a low dropout positive voltage regulator from STMicroelectronics, designed to deliver a fixed 5.0V output with a maximum output current of 800mA. It is available in the SOT-223 package, which is a surface-mount package with an exposed tab for enhanced thermal performance. The device operates with an input voltage range from 6.5V to 15V, making it suitable for a variety of applications that require a stable 5V rail. A low dropout (LDO) regulator is a type of linear voltage regulator that can maintain a regulated output voltage even when the input voltage is very close to the output voltage. This is achieved by using a pass transistor that operates in the saturation region, minimizing the voltage drop across the regulator. LDO regulators are essential in power management systems where efficiency and noise are critical, such as in battery-powered devices, automotive electronics, and industrial control systems. They are part of the broader category of voltage regulators, which also includes switching regulators and charge pumps, each with distinct trade-offs in efficiency, noise, and complexity. Key features of the LD1117S50TR include a low dropout voltage of 1.1V at 800mA, a typical quiescent current of 5mA, and a load regulation of 0.2% typical. The device also includes internal current limiting and thermal shutdown protection, ensuring safe operation under fault conditions. The SOT-223 package offers a thermal resistance of 50°C/W (junction-to-ambient), allowing for moderate power dissipation without external heatsinking in many applications. The LD1117S50TR utilizes a PNP pass transistor architecture, which provides a low dropout voltage and stable operation. The internal bandgap reference ensures accurate output voltage regulation across temperature and load variations. The device is designed to be stable with a wide range of output capacitors, including ceramic capacitors, which simplifies the design and reduces the overall solution size. Typical applications include post-regulation of switching power supplies, battery-powered equipment, and as a local 5V rail for microcontrollers, sensors, and analog circuits. The fixed 5V output is ideal for logic circuits and USB-powered devices. The low dropout voltage allows efficient operation even when the input voltage is only slightly above the output, maximizing battery life in portable applications. When designing with the LD1117S50TR, it is important to ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. The input and output capacitors should be placed close to the device pins to minimize parasitic inductance and ensure stability. The exposed tab of the SOT-223 package should be connected to a copper pour to enhance thermal dissipation, especially when operating at high load currents.
LD39015M33R - 150mA, 3.3V Ultra-Low Noise LDO | STMicroelectronics
The STMicroelectronics LD39015M33R is a fixed 3.3V output, ultra-low noise, low-dropout linear regulator capable of delivering up to 150mA of output current. It is housed in a compact SOT-23-5 package, making it ideal for space-constrained portable and battery-powered applications. The device operates over an input voltage range of 1.5V to 5.5V, with a typical dropout voltage of only 100mV at 150mA load, ensuring efficient operation even with minimal input-to-output headroom. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. Unlike standard linear regulators that require a larger dropout voltage, LDOs use a pass transistor operating in the saturation region to achieve low dropout, making them essential in battery-powered devices where maximizing usable battery voltage is critical. In the power management hierarchy, an LDO is a type of linear regulator, which is a subset of voltage regulators, which in turn are key components of power management ICs (PMICs) used across virtually all electronic systems. Key features of the LD39015M33R include an ultra-low output noise of 30uVrms (typical) over a 10Hz to 100kHz bandwidth, a high power supply rejection ratio (PSRR) of 60dB at 1kHz, and a low quiescent current of 40uA (typical). The device also incorporates internal current limiting and thermal shutdown protection, ensuring robust operation under fault conditions. The fixed 3.3V output eliminates the need for external resistor dividers, simplifying design and reducing component count. Technically, the LD39015M33R is built on a CMOS process, which contributes to its low quiescent current and low dropout performance. The internal bandgap reference provides a stable 3.3V output with an accuracy of ±2% over the full operating temperature range of -40°C to +125°C. The device is stable with ceramic output capacitors as low as 1uF, allowing for compact and cost-effective designs. The SOT-23-5 package has a thermal resistance (theta_JA) of approximately 250°C/W, which must be considered for power dissipation in high-temperature environments. Typical applications include powering low-power microcontrollers, wireless modules (such as Bluetooth Low Energy and Zigbee), MEMS sensors, and other analog/RF circuits that require a clean, stable 3.3V supply. The ultra-low noise and high PSRR make it particularly suitable for noise-sensitive applications like audio codecs and RF transceivers, where supply noise can degrade performance. When designing with the LD39015M33R, ensure that the input voltage remains above the dropout voltage plus the output voltage (3.3V + 100mV = 3.4V) to maintain regulation. Place a 1uF ceramic capacitor on the input and output as close to the pins as possible. The enable pin (EN) can be used for power sequencing; it is active-high and has an internal pull-down, so it can be left floating to disable the output.
LD39030DTPU33R - 3.3V 300mA Ultra-Low Noise LDO | STMicroelectronics
The STMicroelectronics LD39030DTPU33R is a fixed 3.3V output, 300mA ultra-low-noise LDO linear regulator in a 6-pin UDFN (DFN6) package. It is designed for noise-sensitive applications requiring a clean, stable power rail with minimal external components. The device operates from an input voltage range of 1.5V to 5.5V, making it suitable for battery-powered and low-voltage systems. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. Unlike standard linear regulators, LDOs use a pass transistor with a low saturation voltage, allowing them to operate with a small input-to-output voltage differential. In the system hierarchy, an LDO is a specific type of linear regulator, which is a category of voltage regulator, which in turn is a key component in power management ICs. LDOs are widely used in portable electronics, audio equipment, and RF circuits where low noise and fast transient response are critical. Key features of the LD39030DTPU33R include an ultra-low output noise of 10 uVrms (typical) over a 10 Hz to 100 kHz bandwidth, a high PSRR of 70 dB at 1 kHz, and a low dropout voltage of 120 mV at 300mA load. The quiescent current is only 40 uA, which is ideal for battery-powered applications. The device also includes an enable pin for power sequencing, short-circuit protection, and thermal shutdown. The UDFN-6 package (2mm x 2mm) offers a compact footprint with a thermal resistance of 90 C/W, enabling space-constrained designs. The LD39030DTPU33R uses a CMOS architecture with a precision bandgap reference, achieving excellent line and load regulation. The high PSRR minimizes ripple from upstream switching converters, making it suitable for noise-sensitive analog and RF signal chains. The low quiescent current extends battery life in portable devices, while the enable pin allows for efficient power management in multi-rail systems. Typical applications include audio codec power supplies, RF transceiver power rails, sensor interfaces, and portable medical devices. The wide input range and low dropout voltage also support operation from single-cell Li-ion batteries (3.0V to 4.2V) with adequate headroom. When designing with this device, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. The enable pin allows sequential power-up in multi-rail systems, which is essential for processors requiring specific rail sequencing. Place input and output capacitors close to the pins for optimal stability and noise performance.
LD49100PU10RY - 1A Ultra-Low Noise LDO | STMicroelectronics
The STMicroelectronics LD49100PU10RY is a high-performance, ultra-low-noise, low-dropout (LDO) linear regulator capable of delivering up to 1A of continuous output current. It is designed to provide a clean, stable power supply for noise-sensitive analog and RF circuits. The device operates from an input voltage range of 1.4V to 5.5V and provides a fixed output voltage of 1.0V, making it ideal for powering modern digital cores, FPGAs, and precision analog front-ends. The LD49100PU10RY is available in a compact 6-pin DFN (dual flat no-lead) package (2mm x 2mm), which is optimized for space-constrained applications. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. Unlike standard linear regulators, LDOs can operate with a small dropout voltage, typically less than 300mV, which improves efficiency and allows for lower input voltages. LDOs are essential in power management ICs, providing clean, low-noise power rails for sensitive components such as ADCs, DACs, PLLs, and RF transceivers. They are often used in battery-powered devices, where minimizing power loss is critical, and in audio and instrumentation systems where noise performance is paramount. Key features of the LD49100PU10RY include an ultra-low output noise of 6.5 µVrms (10 Hz to 100 kHz), a high power supply rejection ratio (PSRR) of 70 dB at 1 kHz, and a low dropout voltage of 200 mV at 1A load. The device also features a low quiescent current of 30 µA, making it suitable for battery-powered applications. It includes an enable pin for power sequencing, thermal shutdown protection, and current limiting. The DFN package offers excellent thermal performance with a thermal resistance of 60°C/W, enabling reliable operation in compact designs. The LD49100PU10RY utilizes a CMOS architecture with a precision bandgap reference, achieving excellent line and load regulation. The ultra-low noise and high PSRR minimize ripple from upstream switching converters, ensuring clean power rails for noise-sensitive circuits. The device is stable with ceramic output capacitors as low as 1 µF, simplifying the external component count and reducing board space. Typical applications include powering audio codecs, RF transceivers, precision ADC/DAC reference buffers, and low-power microcontrollers. The wide input range and low dropout make it suitable for battery-powered devices, portable instrumentation, and industrial sensors. The enable pin allows for controlled power-up sequencing in multi-rail systems. When designing with the LD49100PU10RY, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. Place input and output capacitors close to the pins to minimize parasitic inductance. The enable pin can be used to implement power sequencing, which is critical for systems with multiple supply rails.
LD49100PU33R - 1A Ultra-Low Noise LDO, 3.3V Fixed | STMicroelectronics
The STMicroelectronics LD49100PU33R is a fixed 3.3V output, ultra-low-noise, high-PSRR LDO linear regulator capable of delivering up to 1A of output current. It is housed in a compact DFN-6 (2x2mm) package, making it suitable for space-constrained portable and industrial applications. The device operates from an input voltage range of 2.5V to 5.5V, providing a stable 3.3V output with a dropout voltage of typically 200mV at full load. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. It achieves this by operating its pass transistor in the linear region, dissipating excess power as heat. LDOs are essential in power management hierarchies, sitting between switching regulators and sensitive loads to provide clean, low-noise power rails. They are widely used in battery-powered devices, audio equipment, RF transceivers, and precision analog circuits where noise and ripple rejection are critical. Key features of the LD49100PU33R include an output noise of 12 µVrms (10 Hz to 100 kHz), a power supply rejection ratio (PSRR) of 70 dB at 1 kHz, and a quiescent current of 30 µA. The device also features an enable pin for power sequencing, internal current limiting, and thermal shutdown protection. The DFN-6 package offers a thermal resistance of 50°C/W, enabling efficient heat dissipation in compact designs. The LD49100PU33R utilizes a CMOS architecture with a precision bandgap reference, achieving excellent line and load regulation. The high PSRR minimizes ripple from upstream switching converters, making it ideal for noise-sensitive analog and RF signal chains. The low quiescent current extends battery life in portable devices, while the wide input range supports various supply rails. Typical applications include powering audio codecs, MEMS sensors, RF transceivers, and microcontroller I/O rails. The fixed 3.3V output simplifies design by eliminating external resistor dividers, and the enable pin allows controlled power-up sequencing in multi-rail systems. When designing with this device, ensure adequate input-to-output voltage headroom to maintain regulation under all load conditions. Place input and output capacitors close to the pins, and use a 1µF ceramic capacitor on the input and a 2.2µF ceramic capacitor on the output for stability.
LDL212PUR - 1.2A Adjustable LDO, 18V Input, DFN-6 | STMicroelectronics
The STMicroelectronics LDL212PUR is a high-PSRR, low-dropout linear voltage regulator that delivers up to 1.2 A of output current from a 2.5 V to 18 V input rail, packaged in a compact 6-pin DFN (3 mm x 3 mm). It provides an adjustable output voltage from 1.18 V to 17.4 V with a typical dropout of 350 mV at 1.2 A, and it integrates internal protection features including current limiting and thermal shutdown. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage approaches the output voltage closely, with the dropout voltage being the minimum VIN-VOUT differential required to keep the pass element in regulation. LDOs sit within the broader taxonomy of linear regulators, which in turn are a category of voltage regulators and a subset of power management ICs (PMICs). Unlike DC-DC switching regulators, LDOs do not switch the pass element, so they introduce no switching noise or EMI but dissipate (VIN - VOUT) x IOUT as heat. Key specifications of the LDL212PUR include 87 dB PSRR at 120 Hz and more than 40 dB at 100 kHz, a low quiescent current suitable for always-on rails, and an operating junction temperature range of -40 C to +125 C. The device also tolerates input transients common in 12 V industrial bus systems and is offered in the thermally enhanced DFN-6 (3x3) with an exposed pad that keeps theta-JA low enough for full 1.2 A operation on a small PCB footprint. Architecturally, the LDL212 uses a PNP pass transistor topology that achieves low dropout while keeping quiescent current modest, paired with a precision bandgap reference and an error amplifier trimmed for high loop gain. This combination yields the wide PSRR bandwidth required to reject ripple from upstream switching converters at both low audio frequencies and high RF switching harmonics. Typical applications include post-regulation after a 12 V or 15 V switching converter in industrial automation, sensor and actuator power rails, battery-powered equipment that needs a clean auxiliary rail from a higher-voltage source, low-noise analog front-end supplies, point-of-load regulation for FPGAs, DSPs, and microcontrollers in 5 V and 3.3 V domains, and general-purpose 12 V-bus regulation. When designing with the LDL212PUR, choose input and output capacitors per the datasheet ESR/ESL guidance to ensure loop stability, and verify that worst-case power dissipation (PD = (VIN_MAX - VOUT_MIN) x IOUT_MAX) stays below the package thermal rating given the PCB copper area. For multi-rail systems, the enable logic and soft-start behavior should be sequenced to match downstream load requirements. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference to compare parametric fits, plan thermal budgets, and select cross-brand equivalents for the LDL212PUR.
LDL212PV33R - 1.2A 3.3V LDO Linear Regulator | STMicroelectronics
The STMicroelectronics LDL212PV33R is a 1.2 A low-dropout (LDO) linear regulator with a fixed 3.3 V output, supplied in a 6-pin DFN (2x2 mm) package. It accepts an input voltage range of 2.5 V to 18 V, with a typical dropout of 350 mV at 1.2 A, and delivers high PSRR of 87 dB at 120 Hz and greater than 40 dB at 100 kHz. The compact 2x2 mm DFN footprint makes it ideal for space-constrained point-of-load regulation. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage, dissipating the difference as heat. LDOs sit within the linear regulator category, which in turn belongs to the broader voltage regulator and power management IC family. Unlike switching regulators, LDOs introduce no switching noise into the output rail, which is critical for noise-sensitive analog, RF, and digital loads. The LDL212 product family from STMicroelectronics targets applications requiring high PSRR and low dropout at moderate current levels. Key features of the LDL212PV33R include an enable logic control function for shutdown, internal current limiting, and thermal protection. The device achieves high power supply rejection ratio of 87 dB at 120 Hz, making it suitable for direct post-regulation following a switching converter, and more than 40 dB at 100 kHz, ensuring clean rails in mixed-signal systems. Its quiescent current is optimized for always-on applications, and the device operates over the industrial -40 °C to +125 °C junction temperature range. The architecture uses a PNP pass element to achieve the low-dropout characteristic, with an internal bandgap reference and feedback network trimmed at the factory to set the 3.3 V output. This fixed-output configuration eliminates the need for external resistor dividers and reduces BOM cost. The combination of high PSRR across frequency and tight load regulation makes the LDL212PV33R particularly well suited to secondary linear regulation after a DC-DC converter. Typical applications include point-of-load regulation for microcontrollers, FPGAs, and ASICs in industrial automation, USB-powered devices, IoT sensor nodes, and post-regulation following a buck converter in audio and communication equipment. The 1.2 A capability supports higher-current digital cores while maintaining a clean rail. When designing with this part, ensure that the input capacitor is placed as close as possible to the IN pin and that the thermal pad is soldered to a sufficient copper pour to keep junction temperature within ratings at maximum dissipation. A 1 µF to 10 µF X7R ceramic output capacitor is recommended for stability. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the official STMicroelectronics datasheet.
LDO40LPU33RY - 400mA, 38V LDO, 3.3V Fixed, DFN-6 | STMicroelectronics
The STMicroelectronics LDO40LPU33RY is a 400 mA, 38 V low-dropout linear regulator (LDO) with a fixed 3.3 V output, housed in a 6-pin DFN (3x3 mm) package with an exposed pad. It uses a low-RDS(on) P-channel MOSFET as the pass element, enabling a dropout voltage in the hundreds of millivolts at full load while drawing only 45 uA of quiescent current. The device operates from 3.5 V to 38 V input, making it suitable for direct connection to 12 V/24 V industrial or automotive buses without a preregulator. An LDO (Low-Dropout) linear regulator is a DC voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. Within the power management hierarchy, LDOs belong to the linear regulator family, which in turn is a subset of voltage regulators and ultimately of power management ICs. Unlike switching regulators, LDOs introduce no switching noise, providing a clean rail for analog and RF loads in exchange for higher conduction loss at large VIN-VOUT differentials. Key features include 45 uA typical quiescent current, internal current limit and thermal shutdown protection, and stability with 1 uF (minimum) X5R/X7R ceramic output capacitors having ESR between 5 mOhm and 12 Ohm. The DFN-6 (3x3) exposed-pad package provides a low thermal resistance path, enabling sustained 400 mA output in confined PCB areas. The LDO40LPU33RY's wide VIN tolerance (up to 38 V) and automotive-grade qualification make it well suited for always-on ECU supplies, body controllers, and sensor rails that must survive load-dump transients. The low Iq extends battery life in standby, an essential property for body and chassis ECUs that remain in active mode when ignition is off. Typical applications include automotive body electronics, industrial sensor and PLC modules, post-regulation for noisy switching rails, and always-on microcontroller supplies. Compared with discrete zener or series-resistor solutions, the LDO40LPU33RY offers tighter regulation and far lower quiescent current. When designing with this device, ensure the input capacitor ESR remains within the stability range defined by the datasheet and provide sufficient copper area beneath the exposed pad to keep junction temperature below 125 C under worst-case load. The enable logic and shutdown current behaviour should also be reviewed if the regulator powers a low-power standby domain. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not consolidated in the ST LDO40L datasheet, giving engineers an actionable comparison across same-package and cross-brand options in the same 6-DFN footprint.
LDQ40 - 40V Low Quiescent Current LDO Regulator | STMicroelectronics
The STMicroelectronics LDQ40 is a low-dropout linear regulator designed for automotive and industrial applications, delivering up to 250 mA output current with a wide input voltage range from 4 V to 40 V. Housed in a compact SOT-23-5 package, this LDO provides a fixed 5.0 V output with a typical dropout voltage of 300 mV at full load, making it suitable for battery-powered and always-on systems where power efficiency is critical. A low-dropout (LDO) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage, minimizing power dissipation. LDOs are a subset of linear regulators, which in turn belong to the broader category of voltage regulators within power management ICs. They are essential in applications requiring clean, low-noise power rails, such as microcontrollers, sensors, and communication modules, where switching regulators would introduce unacceptable ripple. Key features of the LDQ40 include a low quiescent current of 40 µA (typical) at no load, which extends battery life in standby modes, and a wide operating temperature range from -40°C to +125°C, enabling use in harsh environments. The device also offers short-circuit protection, thermal shutdown, and reverse polarity protection, ensuring robust operation in automotive electrical systems. Its fixed 5.0 V output simplifies design by eliminating external resistor dividers. Technically, the LDQ40 employs a PMOS pass transistor architecture, which achieves a low dropout voltage while maintaining low ground current. The internal bandgap reference provides a stable output voltage with ±2% accuracy over temperature and line/load variations. The device is stable with ceramic output capacitors as low as 1 µF, reducing board space and cost. Additionally, the LDQ40 includes an internal current limit and thermal shutdown to protect the IC and downstream circuitry under fault conditions. Typical applications include automotive body control modules, engine control units, infotainment systems, and industrial sensors. In automotive applications, the LDQ40's wide input range and reverse polarity protection make it ideal for direct connection to the vehicle's 12 V or 24 V battery bus. For industrial sensors, the low quiescent current ensures minimal power drain in battery-operated or energy-harvesting systems. When designing with the LDQ40, ensure adequate input and output capacitance (at least 1 µF ceramic) placed close to the pins to maintain stability and transient response. The thermal pad (if present) should be connected to a large copper area for heat dissipation, especially when operating at high input-to-output differentials. For applications requiring higher output current, consider the LDQ40's 250 mA limit and evaluate thermal performance under worst-case conditions.
LF33ABDT - 3.3V 0.5A LDO Regulator w/ Inhibit | STMicroelectronics
The STMicroelectronics LF33ABDT is a 3.3V fixed-output, very-low-dropout (LDO) linear voltage regulator delivering up to 500 mA of output current in a 3-pin DPAK (TO-252) surface-mount package. The device belongs to the LF00 series, offers a typical dropout of 0.45 V at full load, and integrates a logic-controlled electronic inhibit (shutdown) function for low-power standby operation. The LF33ABDT operates over a wide input voltage range and is characterized for use in battery-powered and always-on systems where quiescent current is critical. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage, in contrast to classic NPN regulators that require at least 2-3 V of headroom. LDOs are a subset of linear regulators, which in turn belong to the broader category of voltage regulators and power management ICs. Because an LDO does not switch, it adds no high-frequency EMI to the output, making it the preferred post-regulator choice for noise-sensitive analog and RF rails. Key features of the LF33ABDT include 0.45 V typical dropout at 500 mA, very low quiescent current (typical values in the microamp range in OFF mode and a few hundred microamps in ON mode per the ST datasheet), 500 mA output current, internal current limit and thermal protection, and a TTL/CMOS-compatible inhibit pin. The DPAK (TO-252) package provides an exposed tab that acts as the primary thermal path, enabling reliable operation at full load with a modest PCB copper area. Architecturally, the LF33ABDT uses a PNP pass element topology characteristic of the LF00 family, which provides the low-dropout behavior and simple two-capacitor (input + output) implementation. The on-chip bandgap reference, error amplifier, and PNP pass transistor are co-integrated; the inhibit pin gates the bias network to achieve the low standby current. The device is characterized for operation with low-ESR ceramic or tantalum output capacitors. Typical applications include post-regulation after a switching converter in industrial controls, microcontroller power rails in automotive body and infotainment systems, battery-powered instrumentation, and standby power rails in always-on appliances. Designers choose the LF33ABDT when a clean, low-noise 3.3 V rail is required and 500 mA of load current is sufficient. When designing with this part, calculate worst-case power dissipation as P_D = (V_IN(max) - V_OUT) x I_OUT and confirm the resulting junction temperature stays below 125 C using the DPAK thermal resistance. Place input and output capacitors as close as possible to the IC pins and respect the minimum ESR stability requirements called out in the datasheet. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference for sourcing and second-sourcing the LF33ABDT.
LM134Z - 3-Terminal Adjustable Current Source, 10mA, 40V | STMicroelectronics
The STMicroelectronics LM134Z is a three-terminal adjustable current source designed to operate at current levels from 1 µA to 10 mA, as set by a single external resistor, housed in a TO-92 (through-hole) package. The device operates as a true floating current source, requiring no extra power connections or input signals, with regulation typically rated at 0.02 %/V across a terminal-to-terminal voltage range of approximately 0.8 V to 40 V. Initial current accuracy is specified at ±3 %, and a 10,000:1 dynamic operating range is achievable with a single programming resistor. An adjustable current source is a fundamental analog building block that delivers a precise, supply-independent current into a load, regardless of the voltage developed across it. Within the broader component taxonomy, the LM134Z sits at the level of: current source / current regulator -> analog functional IC -> integrated circuit -> semiconductor. LM134-class devices are used as constant-current biasing elements, low-temperature-co references, and as temperature sensors because the programming current is proportional to absolute temperature (PTAT) by approximately 0.96 %/°C after correction. Key features include a wide dynamic voltage compliance of 1 V to 40 V (per TI's equivalent datasheet for the same LM134 family), an initial current accuracy of ±3 %, and true floating two-terminal operation that allows the device to be stacked in series with any load. The 10,000:1 programmable range makes it suitable for both micropower biasing (µA range) and modest supply-level driving (mA range). Available in a TO-92-3 through-hole package, the LM134Z is widely used on breadboards, in linear regulators, and in test instrumentation. The LM134 family is implemented with a bipolar transistor architecture using a bandgap-style reference and an internal current mirror; this architecture is the reason the device is inherently PTAT and can be used as a temperature sensor by reading the programming resistor voltage. The military temperature grade (-55 °C to +125 °C) and 400 mW power dissipation rating support harsh-environment designs. Quiescent current is established solely by the programming resistor, so no separate supply current exists beyond the programmed load current. Typical applications include low-temperature-co zener biasing, battery charging at constant current, ramp generators, and precision temperature sensing when paired with an op-amp readout. In bias networks for transistors and op-amps, the LM134Z provides a stable reference current that does not drift with supply voltage variations. Industrial process control loops and instrumentation also benefit from the LM134Z's predictable PTAT behavior. When designing with the LM134Z, calculate the programming resistor as R_set = (67.7 mV / I_set) at 25 °C; this sets the nominal current. Add a series resistor of approximately 10× R_set in parallel with R_set to flatten the temperature coefficient if a low-TC bias is desired. Always ensure the load voltage plus the 0.8 V minimum compliance remains within the 40 V absolute maximum rating. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including verified cross-brand pin-compatible equivalents and parametric proximity scoring.
LM22675MR-5.0/NOPB - 1A, 42V SIMPLE SWITCHER Buck Converter | TI
The Texas Instruments LM22675MR-5.0/NOPB is a 1 A step-down (buck) DC/DC switching regulator from TI's SIMPLE SWITCHER® family, offering a fixed 5 V output, a 4.5 V to 42 V input range, and a 500 kHz typical switching frequency in an 8-pin HSOIC (DDA) PowerPAD package with an exposed thermal pad. A buck (step-down) switching regulator is a type of DC-DC converter that uses an internal MOSFET switch, an external inductor, and a control loop to convert a higher DC input voltage into a lower DC output voltage with high efficiency. It belongs to the hierarchy: buck converter → DC-DC converter → power management IC → semiconductor. Unlike linear regulators, switching bucks do not dissipate VIN-VOUT as heat, so they deliver high efficiency (often >85%) across a wide VIN range, making them the standard choice for converting industrial 24 V rails, automotive 12 V battery rails, or other high-voltage buses down to logic-level voltages. Key specifications include 1 A continuous output current, 4.5 V to 42 V wide VIN range, internal 500 kHz switching frequency (set by an internal oscillator, no external RT needed on the fixed Voutout parts), integrated soft-start, precision enable pin with wide hysteresis for adjustable UVLO, and current-mode control for line/load transient performance. The HSOIC-8 (DDA) PowerPAD package provides a low thermal resistance path that lets the part deliver full 1 A output across the full -40 °C to +125 °C operating junction-temperature range. The regulator uses peak current-mode control with internal compensation on the fixed-output versions, a wide-bandwidth error amplifier, and an integrated 150 mΩ high-side N-channel MOSFET. The precision enable input doubles as a programmable under-voltage-lockout threshold, and the SS/TRK pin provides a controlled monotonic startup that limits inrush current from large output capacitors. Combined with internal cycle-by-cycle current limit and thermal shutdown, the architecture is engineered for fault-tolerant industrial and automotive environments. Typical applications include 24 V industrial sensor and PLC power rails, automotive infotainment and body electronics (the -Q1 variant), 48 V telecom point-of-load conversion, point-of-load regulation after a front-end isolated supply, and battery-powered systems that need a tightly regulated 5 V rail from a varying battery voltage. When designing with the LM22675MR-5.0/NOPB, follow the datasheet's recommended inductor (4.7 µH to 10 µH, low DCR), input/output ceramic capacitor (≥4.7 µF X7R with low ESR), and bootstrap capacitor (≥0.1 µF) values. Keep the high-di/dt switching loops short and stitch the exposed PowerPAD to a large ground copper pour to keep θJA within the datasheet-recommended 30 °C/W board condition. This page synthesizes distributor pricing, drop-in cross-brand alternatives, and practical design notes that go beyond the manufacturer datasheet — including a side-by-side comparison against same-brand and competing 42 V / 1 A buck ICs and PCB layout pitfalls specific to the HSOIC-8 PowerPAD footprint.
LM22675MRX-5.0/NOPB - 1A 42V SIMPLE SWITCHER Buck | 5V Fixed
The Texas Instruments LM22675MRX-5.0/NOPB is a 1 A, 42 V SIMPLE SWITCHER step-down (buck) DC-DC converter with a fixed 5.0 V output, packaged in an 8-pin HSOIC (DDA) PowerPAD exposed-pad package. It accepts a wide 4.5 V to 42 V input range, runs at a fixed 500 kHz switching frequency, and uses voltage-mode PWM control with an N-channel high-side MOSFET integrated on-chip. The device includes a precision enable pin for power sequencing and supports an operating junction temperature range of -40 C to +125 C. A buck (step-down) DC-DC switching converter is a switched-mode power supply topology that uses an inductor, output capacitor, and a high-frequency switching element to convert a higher DC input voltage to a lower DC output voltage at high efficiency (typically 90% or better). Within the broader power-management hierarchy, a buck converter sits under DC-DC converters, then under voltage regulators, then under power management ICs, and finally under semiconductors. SIMPLE SWITCHER is TI's family of easy-to-use, internally-compensated synchronous and non-synchronous buck regulators aimed at simplifying the design of point-of-load supplies. The LM22675 integrates a 0.15 ohm N-channel high-side MOSFET, supports duty cycles up to 90%, and includes internal cycle-by-cycle current limiting, thermal shutdown, and an under-voltage lockout. The fixed 5.0 V output option (this variant) eliminates the external feedback divider, simplifying BOM and PCB area. Its 4.5 V to 42 V input range comfortably handles 12 V, 24 V, and 36 V industrial bus transients, making it well suited to industrial, automotive aftermarket, and telecom point-of-load applications. Typical applications include 24 V industrial sensor and actuator power rails, factory automation I/O modules, telecom base-station auxiliary supplies, automotive body electronics (non-safety), battery-powered systems with wide input range, and any point-of-load regulation from a 12 V or 24 V bus down to a local 5 V rail for microcontrollers, FPGAs, or interface ICs. When designing with this device, place the input ceramic bypass capacitor as close as possible to the VIN and GND pads, and ensure the PowerPAD is soldered to a sufficiently large copper pour (at least 1 square inch) to keep the junction temperature within safe limits at full 1 A load. The fixed 5.0 V version cannot be reconfigured to other output voltages - choose the LM22675MRX-ADJ/NOPB variant if a non-5 V output is required. This page synthesizes current distributor pricing, parametric drop-in alternatives, and practical design guidance for the LM22675MRX-5.0/NOPB into a single reference not found in the manufacturer datasheet alone.
LM25010SD/NOPB - 42V, 1A Step-Down Switching Regulator | TI
The Texas Instruments LM25010SD/NOPB is a 42V wide-input, 1A constant on-time non-synchronous buck (step-down) switching regulator housed in a 10-pin WSON (DPR) exposed-pad package. It integrates a 42V N-Channel buck switch and is engineered to deliver an adjustable output from 2.5V to 37V from a 6V to 42V input rail, with a switching frequency that varies with line and load to maintain a constant on-time topology. A buck switching regulator (also called a step-down converter) is a switch-mode DC-DC power converter that produces a lower DC output voltage from a higher DC input voltage. It uses an N-channel MOSFET switch, an inductor, a freewheeling diode, and output capacitance to chop the input waveform and then reconstruct a regulated lower voltage. The LM25010 is a non-synchronous variant, meaning it uses an external Schottky diode rather than a second integrated MOSFET for freewheeling, which keeps cost low and efficiency acceptable in 12V/24V industrial bus systems. Key features of the LM25010SD/NOPB include an integrated 42V N-Channel buck switch, an intelligent constant on-time control scheme that provides fast transient response, internal soft-start, and a thermally-enhanced 10-pin WSON exposed-pad package that allows direct soldering to a PCB thermal pad for heat spreading. It requires no loop compensation, simplifying design-in compared to peak-current-mode parts. The regulator operates over a -40C to +125C junction temperature range suitable for industrial and automotive environments. Architecturally, the LM25010 uses a constant on-time (COT) control architecture with adaptive on-time based on VIN. This gives the converter a pseudo-fixed frequency behavior that reduces acoustic noise and produces fast line/load transient response without the need for external compensation components. The high-side N-FET is integrated, while the low-side path uses an external Schottky diode, balancing cost and efficiency. Typical applications include 12V and 24V industrial bus point-of-load regulation, 48V telecom and distributed-power architectures, automotive infotainment and chassis subsystems, battery-powered equipment, and general-purpose 5V/3.3V/2.5V high-current rails from a wide VIN source. It is well suited to any system that needs an efficient, compact 1A buck solution from a 6V to 42V source. When designing with this device, attention must be paid to the selection of the external Schottky diode (reverse voltage >= VIN(MAX) and average current >= IOUT), the inductor (sized for the chosen on-time and ripple target), and the input/output ceramic capacitors (X7R dielectric, low ESR). The exposed pad must be soldered to a sufficient copper pour to keep the junction temperature within safe limits at full load. According to TI datasheet SNVS428, the WSON-10 (DPR) package achieves a theta_JA of approximately 40 C/W on a standard 4-layer JEDEC test board. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on any single manufacturer or distributor page, including a verified same-package cross-reference set and a side-by-side parameter table for the most common substitution candidates.
LM25011MYX/NOPB - 42V 2A Buck Regulator | Texas Instruments
The LM25011MYX/NOPB is a constant on-time (COT) step-down switching regulator from Texas Instruments delivering up to 2A of output current from a wide 6V to 42V input range, housed in a 10-pin HVSSOP (DGQ) package measuring 3 mm x 4.9 mm. It integrates an N-Channel buck switch, startup regulator, current limit detection, and internal ripple control for a low-cost, efficient buck bias regulator. A buck converter, or step-down regulator, is a DC-DC switching converter that efficiently reduces a higher input voltage to a lower regulated output using a switching element and an LC filter. Unlike linear regulators, buck converters achieve high efficiency even at large input-to-output voltage differences, making them fundamental building blocks in power management IC hierarchies. The LM25011 belongs to the constant on-time regulator family, which regulates by controlling the high-side switch on-time without requiring loop compensation. Key features include the 6V to 42V input operating range with 45V absolute maximum rating, adjustable output from 2.51V to 40V, and 2A load capability. The COT control scheme provides fast transient response with no external compensation network. An adjustable current limit, set via an external resistor, lets designers tailor the peak switch current, while thermal shutdown protects against fault conditions. Technically, the on-time is inversely proportional to input voltage, keeping switching frequency nearly constant across the input range. The internal high-side N-channel MOSFET minimizes conduction losses, and a precision feedback comparator ensures accurate regulation up to 2 MHz operation per datasheet specifications. Typical applications include industrial power supplies, automotive bias rails (with the AEC-Q100 qualified LM25011-Q1 variant), telecom equipment, and 12V/24V distributed bus point-of-load conversion powering microcontrollers and sensors. Design tip: select the inductor and output capacitor per the datasheet design equations, set the current limit resistor above maximum load current, and use short PCB traces with solid ground planes to minimize parasitic inductance.
LM25011QMYX/NOPBQ1 - 42V 2A Buck Regulator Q1 | TI
The Texas Instruments LM25011QMYX/NOPBQ1 (LM25011-Q1 family) is an automotive-grade, 42V, 2A constant on-time (COT) non-synchronous buck switching regulator with adjustable current limit, supplied in a 10-pin HVSSOP (DGQ/MSOP) exposed-pad package. It converts input voltages from 6V to 42V (45V absolute maximum) into an adjustable output from 2.51V up to 40V at up to 2A. A buck (step-down) regulator is a switching DC-DC converter that uses an internal N-channel MOSFET switch, an inductor, and a diode to efficiently reduce a higher input voltage to a lower regulated output. Within the power-management hierarchy, it belongs to the family: switching regulator -> DC-DC converter -> voltage regulator -> power management IC. The constant on-time control topology delivers near-instant transient response with no loop compensation and very low component count. Key features include the integrated 2A N-channel buck switch, adjustable current limit enabling smaller inductors, AEC-Q100 Grade 1 qualification for -40C to +125C operation, a wide 6V-42V input range covering automotive 12V load-dump transients, and switching frequencies up to 2MHz for compact magnetics. The LM25011A variants additionally allow low-dropout operation at high switching frequency. Technically, the COT emulator emulates resistive current-mode behavior, providing good line and load regulation and stable operation with low-ESR ceramic output capacitors. The adjustable current-limit sense resistor lets designers trade peak-current capability against inductor size, and the integrated high-side switch eliminates the external MOSFET and driver, reducing BOM count versus controller-based designs. Typical applications include automotive 12V and 24V point-of-load supplies, industrial 24V bus regulation, LED driver front ends, and post-regulation after wide-Vin automotive modules. The Q1 grade with exposed-pad thermal design fits under-hood-adjacent modules and harsh-environment industrial systems. Design tip: size the current-limit sense resistor for peak inductor current, not just DC load, and verify thermal performance - the exposed pad must be soldered to a ground-plane copper pour for the 2A rating to hold at elevated ambient temperatures.
LM25056PSQ/NOPB - Single-Phase PMBus Power Meter | TI
The Texas Instruments LM25056PSQ/NOPB is a single-phase system power measurement IC with a 3 V to 17 V input range, 0.5% metering accuracy, and a 24-WQFN 4 x 5 mm package. It combines analog and digital measurement circuitry with a PMBus-compliant SMBus/I2C interface for reporting power, voltage, current, and temperature in computing and storage systems. A power measurement IC is a specialized power-management and system-monitoring component that converts real-time electrical operating conditions into digital measurements for a host controller. In the broader hierarchy, it belongs to power-management ICs, interface ICs, energy-metering ICs, and system-power monitors. This hierarchy makes it useful where a backplane power bus must be observed continuously rather than inferred only from system software. The verified device data identifies a 3 V to 17 V input range and 0.5% accuracy. The PMBus-compliant interface supports digital communication with a system-management host, while continuous reporting of power, voltage, current, and temperature enables telemetry, fault monitoring, load analysis, and thermal management. The 24-WQFN package supports compact placement in single-phase power-system designs. Technically, the device combines high-performance analog measurement paths with digital signal processing and an SMBus/I2C interface. This combination allows electrical operating data to be transferred to a host while the measurement circuitry handles the physical power bus. The published temperature range is -40°C to +125°C, supporting industrial and system-level applications where the power rail may experience a broad ambient range. Typical applications include computing and storage blades connected to backplane power buses, server and blade systems, telecom and networking equipment, single-phase power supplies, and embedded system-management controllers. In these systems, the IC provides the measurement layer used to monitor power consumption and operating conditions remotely. When designing around the LM25056PSQ/NOPB, design the PCB for the 24-WQFN footprint, provide the required input and current-measurement connections, and validate the PMBus address and communication settings in the host controller. Confirm the complete pin mapping and thermal layout against the manufacturer datasheet before releasing a production board. The package is surface mount and uses a WQFN family form factor.
LM25066PSQ/NOPB - 2.9-17V PMBus Hot-Swap Controller | TI
The Texas Instruments LM25066PSQ/NOPB is a 2.9 V to 17 V hot-swap controller with a PMBus-compliant SMBus/I2C interface, supplied in a 24-pin WQFN (NHZ) package with an exposed thermal pad. It is designed to measure, protect, and control electrical operating conditions in computing and storage blades connected to a backplane power bus. Verified distributor data identifies a 5.8 mA supply current and a 2.9 V to 17 V supply range. A hot-swap controller, also called a power-path or hot-plug controller, safely manages the connection of a powered circuit card to a live backplane. It controls the inrush path, monitors operating conditions, reports faults, and can provide remote observability and configuration when paired with a PMBus-capable management controller. In the power-management hierarchy, this device belongs to the broader class of specialized power-management and protection ICs. Key verified features include PMBus communication, operation from a 2.9 V to 17 V supply, and compatibility with base stations, networking line cards, and server applications. The LM25066 combines local hardware protection with digital telemetry, helping system designers implement safer field insertion and removal of circuit cards without redesigning the entire power architecture. The device is identified as a 24-WQFN (4 mm x 5 mm) package by distributor data and as a WQFN (NHZ) package with 24 pins by Texas Instruments. Its PMBus interface is relevant to systems requiring measured power, voltage, current, temperature, and fault information at a management host. The exact electrical limits, threshold settings, timing values, and thermal characteristics must be taken from the manufacturer datasheet before final design release. Typical applications include server and storage blades, networking line cards, and base-station equipment using a protected backplane power bus. The LM25066 can help isolate faults, coordinate power sequencing, and improve system observability where a field-replaceable module may be inserted into or removed from energized equipment. A key design consideration is that the controller requires careful review of the complete hot-swap power path, including the external MOSFET, current-sense element, timing components, and PMBus host. Do not infer exact threshold values, fault responses, or pin functions from distributor summaries; use the LM25066 datasheet and TI application information for implementation details. This page consolidates verified distributor specifications, practical application guidance, and same-package replacement information to support engineering selection, sourcing, and cross-reference decisions.
LM2574-5.0BWM - 5V 500mA SIMPLE SWITCHER Buck | Microchip
The Microchip Technology LM2574-5.0BWM is a fixed-output 5V SIMPLE SWITCHER step-down voltage regulator capable of supplying 500mA from an 8V to 40V input range. It uses a 52kHz switching architecture and is available in a surface-mount SOIC-14 wide-body package designated BWM. The regulator is designed for simple, component-reduced power conversion where a 5V rail is required from a higher-voltage source. According to the manufacturer documentation, the LM2574 family provides excellent line and load regulation while requiring only a minimum number of external components. Its fixed-output version simplifies design by eliminating the external feedback resistor divider used with adjustable regulators. The LM2574 is a switching buck regulator, meaning it uses an energy-transfer topology rather than dissipating excess input energy as heat like a linear regulator. In a buck converter, the switch repeatedly connects the input to an inductor and then releases that inductor energy through a diode and output capacitor. The 52kHz oscillator balances component size, conversion efficiency, and switching behavior. This makes the LM2574 suitable for industrial, embedded, communications, and consumer power trees where the input rail is substantially higher than the required 5V output. Key electrical features include a 5V fixed output, 500mA load capability, an 8V minimum input and 40V maximum input according to the Texas Instruments product page, and internal frequency compensation. The fixed output is specified with a guaranteed tolerance of up to 4% over specified input and load conditions. The ON/OFF pin provides shutdown control, while the internal design allows a compact implementation using four external components as highlighted in the product-page description. The wide-body package is suitable for conventional surface-mount assembly rather than through-hole DIP layouts. Typical uses include regulated 5V rails in embedded systems, instrumentation, communications equipment, and low-power industrial controllers. The fixed 5V version is especially useful when the load does not require adjustable output and the design team prefers a direct, validated regulator configuration. Compared with a linear regulator, the switching approach can reduce power dissipation when the input-output voltage difference is large, although inductor ripple and switching-node transitions must still be considered in sensitive analog or RF circuits. External input, output, inductor, and catch-diode components remain essential for stable operation. A key design consideration is component selection around the switching loop. The inductor must carry the required 500mA output current with suitable saturation margin, while the diode and capacitors should be placed close to the regulator pins to reduce switching-loop area and parasitic inductance. The enable pin should be driven with suitable logic levels and appropriate pull-up or pull-down behavior for the system power state. The 5V output is not a low-noise linear rail; filtering may be needed if sensitive analog loads share the same node. The datasheet should be consulted for exact absolute maximum ratings, thermal limits, recommended external values, and the complete BWM pin assignment. This product page combines verified manufacturer-family information, distributor identifiers, application guidance, and engineering-oriented comparison points for LM2574-5.0BWM. It is intended to help engineers confirm package compatibility, output requirements, switching topology, and supply-chain availability before incorporating the regulator into a new design.
LM2574M-5.0/NOPB - 0.5A Buck Regulator, 5V Fixed | Texas Instruments
The Texas Instruments LM2574M-5.0/NOPB is a monolithic 0.5 A step-down (buck) switching regulator that delivers a fixed 5 V output from an 8 V to 40 V input rail, housed in a 14-pin SOIC package (7.50 mm / 0.295 inch body width). It is part of TI's SIMPLE SWITCHER family and requires only four external components (inductor, input capacitor, output capacitor, and catch/freewheeling diode), enabling compact point-of-load designs with minimal BOM count. What is a buck switching regulator? A buck converter is a switch-mode DC-DC power supply topology that steps a higher input voltage down to a lower regulated output voltage with high efficiency (typically 75-90%) by rapidly switching a power transistor and storing energy in an external inductor. Unlike a linear regulator, which burns the excess voltage as heat, a buck regulator pulses energy through an LC output filter, making it ideal when the input-to-output voltage differential is large or when thermal dissipation must be minimized. Key features of the LM2574M-5.0/NOPB include a guaranteed 0.5 A output current, a fixed 5 V output (no external feedback resistors needed), a 52 kHz nominal switching frequency, ±4% output tolerance over line and load, internal current limiting, and thermal shutdown protection. Its wide 8 V to 40 V input range covers 12 V and 24 V industrial bus rails as well as automotive and telecom supply voltages. The 14-SOIC package with an exposed die-attach pad aids heat dissipation on standard 2 oz copper. Architecturally, the LM2574 uses a voltage-mode PWM control loop with a fixed-frequency oscillator, a 1.235 V bandgap reference, and an internal NPN power switch. The high-gain error amplifier compares the divided output against the reference and modulates the switch duty cycle to maintain regulation. Its simple feedback and lack of compensation network requirements make it a popular choice for engineers transitioning away from LM78xx three-terminal linear regulators. Typical applications include 12 V or 24 V industrial sensor power, automotive accessory subsystems, point-of-load regulation for microcontrollers and logic, battery chargers for lead-acid or Li-ion stacks, and small appliance or HVAC control boards. The 5 V fixed output is a particularly common rail for 5 V MCUs, transceivers, and logic. When designing with this part, observe the catch-diode reverse-voltage and current ratings, choose an inductor with a saturation current at least 1.3× the regulator's switch current limit, and place input/output capacitors close to the IC. The fixed 52 kHz switching frequency allows use of small inductors and standard aluminum-electrolytic output capacitors. This page synthesizes distributor pricing, drop-in same-package alternatives within the LM2574 family, and PCB layout guidance that complements the manufacturer datasheet.
LM2576D-ADJRG - 3A Adjustable Buck Regulator 52kHz | HANSCHIP
The HANSCHIP LM2576D-ADJRG is a monolithic 3 A step-down (buck) switching regulator in a thermally efficient SOP-8L surface-mount package, providing an adjustable output from 1.23 V to 37 V with a 52 kHz fixed switching frequency. A buck switching regulator is a DC-DC converter topology that uses a power switch, an inductor, and a synchronous or freewheeling diode to step a higher input voltage down to a lower regulated output. Compared with linear regulators, a buck converter achieves much higher efficiency (typically 75-88% for the LM2576) because the switch dissipates only a small fraction of the input power, rather than dropping the surplus as heat. The LM2576 family sits in the power management hierarchy between simple linear regulators (LDO) and modern synchronous buck controllers, and is widely used where a low-component-count, robust asynchronous buck is acceptable. The LM2576 retains the SIMPLE SWITCHER legacy of needing only four external components (inductor, catch diode, input capacitor, output capacitor) to assemble a complete DC-DC converter. Key specifications include a 3 A continuous output current capability, an input voltage range of 8 V to 40 V, a 52 kHz fixed switching frequency that allows use of small magnetic components, and a 5 mA typical quiescent current. Housed in the SOP-8L (TO-252-style surface-mount) package, the device supports operation from -40 C to +125 C junction temperature and includes built-in thermal shutdown and current-limit protection. The PSIP/SOP-8L footprint gives the same pinout as the industry-standard TO-263 D2PAK-5 and improves thermal performance versus smaller SOIC packages. Internally, the LM2576D-ADJRG uses a voltage-mode control loop with an internal 1.23 V reference, an error amplifier, a 52 kHz oscillator, and a high-current NPN output switch. The architecture intentionally uses an NPN switch (not synchronous MOSFETs) to keep the design simple, with the trade-off of a freewheeling Schottky diode requirement and slightly lower efficiency than synchronous alternatives. The 52 kHz oscillator is internally trimmed so external frequency-setting components are not required. Typical applications include distributed power systems with 12 V or 24 V input buses, battery chargers for lead-acid or Li-ion cells, LED drivers, hobby electronics, and step-down supplies for embedded boards and industrial controllers. The wide input and output ranges support industrial 24 V bus rails as well as 12 V automotive systems with adequate transient headroom. When designing with this part, choose a Schottky diode with sufficient current and voltage rating, and select an inductor value that maintains continuous conduction mode at the minimum expected load. Verify thermal dissipation with the worst-case VIN and full 3 A load - at VIN=24 V to VOUT=5 V at 3 A efficiency is roughly 80%, so about 3.8 W is dissipated in the IC, which the SOP-8L tab and copper pour must absorb. This page synthesizes distributor pricing, drop-in cross-brand equivalents, and a pin-by-pin replacement view for the SOP-8L footprint, providing engineering context not found in any single datasheet.
LM2591HVS-ADJ - 60V 1A 150kHz Buck Regulator, Adj | TI
The Texas Instruments LM2591HVS-ADJ is a monolithic SIMPLE SWITCHER step-down (buck) switching regulator in a 5-lead TO-263 (KTT/DDPAK) package capable of driving a 1A load from a 4.5V to 60V input rail and producing an adjustable output from 1.2V to 57V. The high-voltage (HV) suffix distinguishes it from the 40V LM2591, enabling use on 48V telecom rails, industrial 24V/36V buses, and battery systems with transients up to 60V. A buck (step-down) switching regulator is a DC-DC converter topology that uses a power switch, an inductor, a diode, and input/output capacitors to convert a higher DC input voltage into a lower DC output voltage at high efficiency (typically 75-88% for the LM2591HV family). It belongs to the broader hierarchy: buck regulator -> DC-DC switching converter -> power management IC -> semiconductor. Compared with linear regulators, buck converters dissipate far less heat because the pass element switches rather than operating in its linear region. Key features of the LM2591HVS-ADJ include a fixed 150 kHz internal oscillator that allows use of small inductors and filter capacitors, an adjustable output set by two external resistors, internal current limiting, and thermal shutdown for self-protection. The fixed-frequency architecture simplifies EMI filter design, and the TO-263 tab provides a low thermal resistance path (with proper copper area) suitable for continuous 1A output at moderate input voltages. The device uses a current-mode control loop with internal compensation, eliminating the need for external loop components. The output switch is a 3A-rated DMOS transistor that handles peak inductor currents during the switch-on phase while the external Schottky diode (or the integrated catch diode in some variants) provides the freewheeling path during switch-off. Typical applications include 48V telecom point-of-load conversion, industrial 24V/36V sensor and actuator supplies, battery charging systems for lead-acid or Li-ion stacks, automotive accessory rails (with input transient protection), and hobby/maker buck modules. The adjustable output and wide VIN range also suit solar charge controllers and distributed DC bus architectures. When designing with this part, place the input capacitor (≥470 µF low-ESR aluminum or 220 µF ceramic) directly across the input pins with short traces, and minimize the loop area formed by the switch node, diode, and inductor to reduce ringing and EMI. The ON/OFF pin (high = shutdown on some variants, low on others) should be tied to ground (or VOUT per the datasheet) if unused, with a soft-start capacitor if controlled turn-on is required. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the standalone manufacturer datasheet.
LM2592HVS-5.0/NOPB - 2A 60V Step-Down Switching Regulator | Texas Instruments
The Texas Instruments LM2592HVS-5.0/NOPB is a monolithic SIMPLE SWITCHER step-down (buck) voltage regulator that delivers a fixed 5V output at up to 2A load current from a wide 4.5V to 60V input range, packaged in a 5-pin TO-263 (KTT) surface-mount D2PAK with exposed tab. Operating at a fixed 150 kHz switching frequency, the device requires only four external components (an inductor, input/output capacitors, and a catch diode) to build a complete isolated or non-isolated DC-DC converter, and includes a TTL-compatible shutdown pin with a typical standby current of 90 µA. A buck (step-down) switching regulator is a switch-mode power supply topology that converts a higher DC input voltage to a lower DC output voltage by chopping the input with a power switch and smoothing the resulting pulsed waveform through an LC filter. Compared with linear regulators, buck converters achieve much higher efficiency (typically 80-90% here) because they do not dissipate VIN-VOUT as heat; the LM2592HV family sits in the hierarchy: buck regulator > switching regulator > DC-DC converter > power management IC > semiconductor. Key specifications include ±4% output voltage tolerance over line and load, ±15% oscillator frequency tolerance, an internal current limit, and thermal shutdown. The high-voltage (HV) variant extends the maximum input to 60V, making it tolerant of 48V telecom rails and load-dump transients in 24V industrial buses. The exposed tab of the TO-263 (KTT) package provides a low thermal resistance path, supporting continuous 2A output without external heatsinking in many layouts. Typical applications include 24V/48V industrial bus regulation, distributed power systems, battery chargers, and point-of-load conversion after a front-end AC-DC supply. The wide VIN range and integrated switch simplify designs where designers previously needed external MOSFETs, current-sense amplifiers, and gate drivers. When designing, choose an inductor around 33 µH for 5V/2A output to minimize ripple, and use a Schottky catch diode with reverse voltage rating above VIN(MAX). Place input capacitors as close as possible to the VIN and GND pins to suppress high-frequency switching noise. This page synthesizes distributor pricing, pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet.