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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.
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.
LM2596S-ADJ - 3A Adjustable Step-Down Switcher | Texas Instruments
The Texas Instruments LM2596S-ADJ is a 150 kHz, 3 A step-down (buck) switching regulator in a 5-lead TO-263 (D2PAK, TO-263BA) surface-mount package with an adjustable output voltage from 1.2 V to 37 V. It accepts a wide 4.5 V to 40 V input, integrates the power switch, oscillator, and thermal-shutdown block, and only requires four external components to build a complete buck converter. A buck (step-down) switching regulator is a type of DC-DC converter that uses a power switch, inductor, and rectifier to efficiently lower an input voltage to a lower regulated output. Compared with linear regulators, buck converters dissipate far less power because they switch the pass element fully on or fully off, reaching typical efficiencies of 73% to 88% at 3 A. The LM2596 sits in the classic SIMPLE SWITCHER family: non-isolated, asynchronous, and easy to design around with standard 33 µH inductors and 220 µF output capacitors. Key features include a fixed 150 kHz internal oscillator, 3 A continuous output current, 4.5 V to 40 V input range, adjustable output from 1.2 V to 37 V (set by external feedback resistors), TTL-shutdown input, internal current limiting, and thermal shutdown. The 5-lead TO-263 (D2PAK) tab provides a low thermal-resistance path that can dissipate the 7 W to 15 W typical full-load losses when soldered to sufficient copper area. Internally, the LM2596 uses a fixed-frequency, peak-current-controlled control architecture with an external compensation network chosen by the output capacitor type. The datasheet specifies standard and high-efficiency design tables that pair 33 µH inductors with 220 µF output capacitors (standard) or 330 µF with Schottky rectifiers (high-efficiency), giving the designer a proven starting BOM. Typical applications include 24 V-to-5 V/3.3 V industrial bus conversion, automotive accessory power, hobby robotics and drone LiPo battery regulation, distributed 12 V PoE auxiliary rails, and DIY buck modules. With thousands of third-party modules built around the part, it remains the canonical first buck regulator most engineers cut their teeth on. When designing, follow the datasheet catch-diode selection carefully: a 3 A Schottky such as the MBR360 keeps efficiency high, while a 1N5822 or similar is acceptable for lower-frequency, lower-cost designs. Keep the input capacitor loop tight and never operate above 40 V input; add a TVS such as P6KE39A for transients beyond 40 V. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single decision-ready view of the LM2596S-ADJ.
LM2596S-ADJ/NOPB - 3A, 40V Adjustable Buck Regulator | TI
The Texas Instruments LM2596S-ADJ/NOPB is a monolithic 3 A step-down (buck) switching voltage regulator in a 5-pin TO-263 (D2PAK) surface-mount package. Operating from a 4.5 V to 40 V input and delivering an adjustable output from 1.2 V to 37 V at up to 3 A, it integrates a 150 kHz fixed-frequency oscillator, an internal switch rated to 45 V/3 A, current limiting, thermal shutdown, and an ON/OFF control input. A buck (step-down) switching regulator is a DC-DC converter that uses an inductor and a switch to lower a higher DC input to a lower regulated DC output with much higher efficiency than a linear regulator. The LM2596 belongs to the SIMPLE SWITCHER family of power management ICs, sitting in the broader hierarchy of voltage regulator → DC-DC converter → power management IC → semiconductor. Its 150 kHz switching frequency allows the use of small, low-cost inductors and aluminum electrolytic output capacitors, simplifying BOM. Key features include 3 A continuous output current, 4.5 V to 40 V input range, 1.2 V to 37 V adjustable output, 150 kHz fixed-frequency operation, internal high-current switch, thermal shutdown and current-limit protection, and an enable/ON-OFF pin for sequenced power-up. Typical standby current is 80 µA in shutdown. Architecturally, the LM2596 uses a fixed-frequency voltage-mode control loop with a 0.2 V internal reference. The high-side NPN Darlington switch drops about 1.5 V at full load, and the device requires a flyback Schottky diode, an inductor, and input/output capacitors to complete a converter. Efficiency typically reaches 73–80% at 5 V/3 A from 12 V input. Because it is non-synchronous, designers choose a Schottky such as the 3 A 40 V SS34. Typical applications include 24 V industrial bus to 5 V/3.3 V point-of-load conversion, battery chargers, automotive accessory supplies (with input transient protection), distributed power systems, LED drivers, hobby robotics, and any design that needs a simple, rugged, low-BOM-count buck regulator. When designing with the LM2596, ensure the input voltage never exceeds 40 V (45 V abs max), keep the catch diode loop area small, and provide a 1 oz copper pour under the tab for thermal dissipation at sustained 2–3 A loads.
LM2596SX-ADJ/NOPB - 3A 150kHz Buck Regulator | Texas Instruments
The Texas Instruments LM2596SX-ADJ/NOPB is a SIMPLE SWITCHER step-down (buck) switching regulator delivering up to 3A of continuous output current from a 4.5V to 40V input, with an adjustable output from 1.2V to 37V. It is housed in a 5-pin TO-263 (D2PAK, KTT) surface-mount package with an exposed tab for thermal dissipation, operating from -40C to +125C. A buck converter, or step-down regulator, is a type of DC-DC switching voltage regulator that efficiently reduces a higher input voltage to a lower output voltage. It belongs to the power management IC family and uses a switching element, an inductor, and a freewheeling diode to transfer energy in controlled pulses, achieving far higher efficiency than linear regulators. The LM2596 is a non-synchronous buck, using an external Schottky diode for the freewheeling path, which keeps the design simple and low cost. Key features include the wide 4.5V to 40V input range, adjustable output down to 1.2V via an external resistor divider, 3A output capability with excellent line and load regulation, and a fixed 150 kHz switching frequency that allows small inductors and low component count. Internal frequency compensation, thermal shutdown, and current limiting protect against fault conditions. Efficiency reaches up to roughly 90 percent depending on input-output differential and load. Technically, the LM2596 uses voltage-mode PWM control with a nominal 150 kHz oscillator (110 kHz to 173 kHz range per datasheet). Only a few external parts are needed: an inductor, catch diode, and input/output capacitors, and TI documents standard inductor series for quick designs. Typical applications include point-of-load supplies for microcontrollers, FPGAs, and DSPs, 12V and 24V industrial bus regulation, battery-powered equipment, automotive electronics, and popular adjustable DIY power modules. Design tip: size the inductor for continuous conduction mode at full load, use a Schottky diode rated for peak current, and solder the exposed tab to adequate copper area to keep junction temperature within limits. Pricing references are as of 2026-08-30.
LM2596SX-ADJ/NOPB-Q1 - 3A 150kHz Buck Regulator | TI
The Texas Instruments LM2596SX-ADJ/NOPB-Q1 is a SIMPLE SWITCHER step-down (buck) voltage regulator delivering up to 3A output current from a 4.5V to 40V input, with an adjustable output from 1.23V to 37V, in a TO-263 (KTT, DDPAK-5) surface-mount package. It operates at a fixed 150 kHz switching frequency and requires only four external components, minimizing BOM count and board area. A buck (step-down) switching regulator is a type of DC-DC converter that uses a switching element, inductor, and diode to efficiently reduce a higher input voltage to a lower output voltage. Unlike linear regulators, buck converters achieve high efficiency (up to 92% per TI datasheet) by minimizing power lost as heat, making them the workhorse of power management IC hierarchies for industrial, automotive, and consumer systems. Key features include 3A load capability with cycle-by-cycle current limiting, 150 kHz fixed-frequency operation that simplifies output filter design and keeps switching noise out of sensitive bands, a wide 4.5V to 40V input range tolerant of automotive load-dump transients, and a low 5 mA typical quiescent current. The adjustable version sets output via two external resistors (VOUT = 1.23V x (1 + R2/R1)). Internally, the LM2596 uses a voltage-mode PWM controller driving an NPN power switch, with internal thermal shutdown and current-limit protection. The TO-263 (D2PAK) package with exposed tab provides low thermal resistance to the PCB, supporting full 3A operation over -40C to +125C junction temperature. Typical applications include automotive auxiliary power rails, industrial 24V bus point-of-load conversion, and 5V/3.3V supplies for microcontrollers and logic. Note: verified distributor data confirms the standard LM2596SX-ADJ/NOPB; the -Q1 AEC-Q100 variant should be confirmed against TI ordering information for automotive builds. Design tip: keep the input capacitor, catch diode, and inductor loops short and place the feedback divider close to the ADJ pin; use a low-ESR output capacitor and Schottky diode rated for peak switch current.
LM2596T-12 - 3A 12V Buck Regulator 150kHz | Texas Instruments
The Texas Instruments LM2596T-12 is a SIMPLE SWITCHER 150 kHz 3 A step-down (buck) switching voltage regulator with a fixed 12 V output, housed in a 5-pin TO-220 (T) through-hole package with formed leads. It accepts an input voltage range of 4.5 V to 40 V and drives 3 A loads with excellent line and load regulation. A buck regulator is a type of switching DC-DC converter that steps a higher input voltage down to a lower output voltage using an internal power switch, an inductor, and a diode. Within the power management hierarchy, the LM2596T-12 belongs to the switching regulator family, sitting above linear regulators in efficiency and below power modules in integration. Switching regulators dissipate far less power than LDOs because the pass element switches rather than conducts continuously. Key features include a fixed 12 V output with plus/minus 4 percent maximum tolerance over line and load, a 3 A output load current capability, a low external component count requiring only a few passives, and a 150 kHz internal oscillator that permits smaller inductors than 52 kHz predecessors such as the LM2576. An ON/OFF pin enables low-current shutdown, and the family also offers 3.3 V, 5 V, and adjustable (1.2 V to 37 V) versions in the same footprint. Technically, the LM2596 is a monolithic bipolar IC integrating the reference, error amplifier, oscillator, and 3 A NPN switch. Its non-synchronous buck topology requires an external catch diode and inductor, achieving typical efficiencies of 80 to 92 percent depending on input and load conditions. Typical applications include industrial 24 V to 12 V rail conversion, automotive accessory power supplies, distributed 12 V logic and relay supplies, and bench or hobby power modules where a rugged through-hole part simplifies assembly. Design consideration: use the inductor values and diode recommendations from the manufacturer datasheet; the external Schottky diode must be rated for the peak switch current to prevent failure at full load. This page synthesizes distributor pricing, verified drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
LM2596T-5.0/NOPB - 5V 3A Buck Regulator 150kHz | TI
The Texas Instruments LM2596T-5.0/NOPB is a SIMPLE SWITCHER 150 kHz step-down (buck) switching voltage regulator delivering a fixed 5 V output at up to 3 A from a 4.5 V to 40 V input, housed in a 5-pin TO-220 (NDH) through-hole package with formed leads. A buck (step-down) switching regulator is a DC-DC power converter that produces a lower output voltage from a higher input voltage by switching an internal power transistor at a fixed frequency and filtering the resulting waveform with an inductor and capacitor. Unlike linear regulators, switching regulators dissipate far less power as heat, making them the preferred choice whenever efficiency, thermal budget, or input-to-output voltage difference matters. The LM2596 sits within the broader hierarchy: switching regulator > DC-DC converter > voltage regulator > power management IC. Key features include the wide 4.5 V to 40 V input range that tolerates unregulated industrial supplies and 24 V buses, a fixed 5 V output with excellent line and load regulation, and 3 A output capability. The 150 kHz switching frequency allows the use of smaller inductors than older 50 kHz designs, while the external component count is deliberately low - a standard series of inductors from multiple manufacturers is pre-characterized for this part, greatly simplifying switch-mode power supply design. Internally the LM2596 is a monolithic IC integrating the power switch, oscillator, PWM control, and protection circuitry. The non-synchronous (external catch-diode) topology keeps the die simple and robust; efficiency at typical loads is high compared with equivalent linear solutions, significantly reducing heatsink requirements. The ON/OFF (enable) pin permits low standby-current shutdown. Typical applications include 5 V logic and microcontroller supplies from 12 V or 24 V rails, industrial automation power stages, battery chargers, and point-of-load conversion in instrumentation. The through-hole TO-220 package suits hand-soldered prototypes, repair, and high-vibration environments where solder joints benefit from larger mechanical land area. Design consideration: choose the catch diode (Schottky, rated above input voltage and 3 A), inductor, and output capacitors per the manufacturer datasheet tables; a poor inductor selection is the most common cause of instability or excessive ripple. This page synthesizes distributor pricing, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, with data verified as of 2026-09-11.
LM26480QSQ-AA - Dual 1.5A Buck + Dual 300mA LDO PMIC | Texas Instruments
The Texas Instruments LM26480QSQ-AA is a multi-functional Power Management Unit (PMU) that integrates two 1.5A step-down DC/DC buck converters and two 300mA linear regulators (LDOs) in a 24-pin WQFN (RTW) 4x4mm package, qualified to the AEC-Q100 automotive standard. It operates from a 2.8V to 5.5V input rail and switches at a fixed 2 MHz (typical) frequency, enabling the use of small external inductors and ceramic output capacitors. Total deliverable current is approximately 2.4A across the four outputs. A Power Management IC (PMIC) is a single-package device that consolidates multiple DC/DC and LDO regulators so a multi-rail SoC, FPGA, or processor can be powered from one compact, factory-trimmed block. PMICs belong to the broader power-management category (DC/DC converters + LDOs + supervisors) and are widely used to reduce PCB area, simplify sequencing, and improve overall system efficiency versus a discrete regulator solution. The LM26480 sits in the mid-power PMIC segment, targeted at automotive infotainment, ADAS sensors, and industrial HMI boards. Key features include up to 96% typical buck efficiency, internal soft-start, undervoltage lockout (UVLO), current-limit protection, and thermal shutdown. Each output voltage is externally programmable through external resistor dividers (typical output range 0.8V to ~3.6V depending on rail), letting one PMIC serve processor core, I/O, memory, and auxiliary analog supplies. The high 2 MHz switching frequency pushes ripple noise above the AM-band, easing input filter design in automotive radio systems. Architecturally, the LM26480 uses two synchronous current-mode buck controllers with integrated high-side and low-side FETs, paired with two parallel-path linear regulators that can be derived from the bucks or directly from VIN. The device is rated for -40C to +125C junction operation, supports AEC-Q100 Grade 2 automotive reliability, and is offered in a thermally enhanced WQFN-24 (RTW) package with an exposed pad that ties to system ground for lowest thermal resistance. Typical applications include automotive infotainment head units, ADAS sensor modules, industrial HMI controllers, and portable/multi-rail SoC platforms where PCB real estate is at a premium. When designing with this part, ensure the exposed pad is soldered to a sufficiently large copper pour to keep junction temperature within the -40C to +125C window at full 1.5A per-buck load. The datasheet's recommended input capacitors (typically 10uF X5R ceramic) and output inductors (typically 1.0-2.2uH) should be selected with DC-bias derating in mind. This page synthesizes distributor pricing, AEC-Q100 cross-references, and practical layout notes not found in the manufacturer datasheet, helping engineers quickly decide if the LM26480QSQ-AA is the right PMIC for their next multi-rail design.
LM2672M-5.0/NOPB - 1A, 40V Step-Down Switching Regulator | TI
The Texas Instruments LM2672M-5.0/NOPB is a fixed 5V output, 1A SIMPLE SWITCHER step-down (buck) switching regulator housed in an 8-pin SOIC package. It accepts a wide 8V to 40V input range, switches at 260 kHz, and uses TI's SIMPLE SWITCHER architecture to deliver high efficiency with a low external component count. The /NOPB suffix indicates a lead-free, RoHS-compliant matte-tin finish and TI's standard grade-1 qualification. A buck (step-down) switching regulator is a power management IC that converts a higher DC input voltage to a lower DC output voltage by rapidly switching an internal MOSFET and smoothing the resulting pulsed waveform through an LC low-pass filter. Compared with linear regulators, buck converters achieve far higher efficiency (typically 85-95% versus 30-60% for an LDO at large VIN-VOUT deltas) because they recycle energy through an inductor instead of burning it as heat. Within the broader taxonomy, buck regulators sit under DC-DC converters -> voltage regulators -> power management ICs -> semiconductors, and they remain the dominant topology whenever a regulated lower voltage must be derived from a battery, 12V/24V rail, or USB bus. The LM2672M-5.0/NOPB delivers a fixed 5V output at up to 1A, features internal frequency compensation, and includes cycle-by-cycle current limiting plus thermal shutdown. The 260 kHz fixed switching frequency permits the use of small surface-mount inductors and ceramic output capacitors, enabling compact PCB layouts. A wide 8V-40V input range makes the part tolerant of automotive load-dump transients and industrial 24V bus rails. The internal high-side DMOS switch is rated for the full 40V input without external protection, simplifying the BOM to typically just an inductor, two capacitors, a diode, and four feedback resistors are unnecessary because the 5V version is factory-trimmed. Typical applications include distributed 5V supply rails from a 12V or 24V system bus, point-of-load regulation after a front-end converter, automotive body electronics powered directly from the battery (with load-dump protection upstream), industrial sensor and actuator supplies, and battery-powered instruments requiring high step-down efficiency. Design considerations include choosing an inductor with adequate saturation current (typically >1.3A) and low DCR for best efficiency, and selecting a Schottky catch diode with reverse voltage greater than VIN(MAX). Output ripple depends on the LC filter; the manufacturer datasheet recommends a 100 uH to 470 uH inductor with low-ESR ceramic or low-ESR tantalum output capacitors. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LM2673S-ADJ/NOPB - 3A Adjustable Buck Regulator | Texas Instruments
The Texas Instruments LM2673S-ADJ/NOPB is a SIMPLE SWITCHER buck switching regulator with a 3 A output-current capability, an 8 V to 40 V input-voltage range, and an adjustable output from 1.2 V to 37 V. It is packaged in a 7-lead TO-263 D2PAK-style package with a tab for thermal conduction. A buck converter, also called a step-down switching regulator, reduces a higher DC input voltage to a lower regulated DC output. The LM2673 integrates the control functions, switching element, voltage reference, and adjustable-current-limit capability needed for a complete buck-converter power stage. It is intended for designers who need a straightforward 3 A regulator rather than a more complex configurable converter. The main features include one adjustable output, a 3 A load capability, an 8 V to 40 V operating input range, and adjustable output voltage. According to the Texas Instruments LM2673 product page, the device is the LM2673S-ADJ/NOPB adjustable-output version in the TO-263 (KTW) package with 7 pins. The NOPB suffix identifies the lead-free ordering option commonly used for industrial and commercial supply chains. This converter uses a step-down switching topology and requires external components including the inductor, input capacitor, output capacitor, and feedback resistors. The adjustable output is set by external resistor selection, while the current-limit function is also adjustable according to the device description. Designers should account for switching-node layout, ripple current ratings, thermal resistance, and the regulator’s maximum input and output limits. Typical applications include industrial control systems, telecom and networking equipment, automotive accessory power, instrumentation, and general 24 V input power conversion. Its 3 A rating makes it suitable for moderate-load rails rather than high-current server or processor supplies. The TO-263 tab assists heat transfer, but the thermal design still depends on PCB copper area, ambient temperature, switching frequency, and output voltage. For a drop-in replacement, compare the exact footprint, lead count, pin names, input range, output range, current rating, and adjustment method. LM2673 variants may share the family footprint, but not every related part has identical lead functionality. Verify the manufacturer datasheet and complete the thermal and compensation checks before substitution. This page combines verified distributor information, family-level technical context, practical design notes, and comparison guidance that is more useful for engineering evaluation than a basic distributor listing alone. Pricing and availability should be confirmed directly with an authorized distributor before procurement.
LM2675M-3.3/NOPB - 1A, 40V Buck Regulator, 3.3V Fixed | TI
The Texas Instruments LM2675M-3.3/NOPB is a SIMPLE SWITCHER® monolithic buck (step-down) switching regulator with a fixed 3.3V output, 1A load capability, and 6.5V to 40V input range, housed in an 8-pin SOIC (0.154" / 3.90mm width) package. It switches at 260 kHz, achieving greater than 90% efficiency while using only a handful of inexpensive external LC components. The device is part of TI's legacy LM267x family designed for low-component-count designs. A buck (step-down) switching regulator is a DC-DC converter that efficiently reduces a higher DC input voltage to a lower DC output voltage by rapidly switching a power transistor and storing energy in an inductor. Buck regulators belong to the broader category of switch-mode power supplies (SMPS), which sit above linear regulators in the power management IC hierarchy. Compared to linear regulators that dissipate the VIN-VOUT differential as heat, switching bucks like the LM2675 deliver high efficiency across wide input ranges, making them ideal for 12V, 24V, and 36V industrial bus systems. Key features of the LM2675M-3.3/NOPB include 260 kHz fixed switching frequency that enables compact LC filter sizing, internal MOSFET switch, thermal shutdown, cycle-by-cycle current limiting, and a guaranteed ±1.5% output voltage tolerance (with the /NOPB grade). The SOIC-8 package provides adequate thermal performance when copper traces are used as a heatsink, owing to the high efficiency that minimizes internal dissipation. Architecturally, the LM2675 uses a voltage-mode PWM control loop with a precision bandgap reference and a high-side DMOS power switch monolithically integrated. The 260 kHz operation allows designers to use surface-mount inductors and small ceramic or low-ESR tantalum capacitors, dramatically shrinking the total solution footprint versus 150 kHz predecessors like the LM2596. Typical applications include 24V industrial sensor rails, distributed 12V-to-3.3V point-of-load (POL) conversion, automotive infotainment subsystems, and battery-powered systems with wide Vin swings. The wide 6.5V to 40V input range makes it well suited for 24V industrial buses and 12V automotive transients. A key design consideration is that the LM2675 is a hard-switching non-synchronous buck — efficiency is very high but ripple requires adequate output capacitance; choose low-ESR capacitors and follow the datasheet's recommended inductor and C_out values for stable operation.
LM2675M-5.0/NOPB - 1A, 5V Fixed SIMPLE SWITCHER Buck Regulator | Texas Instruments
The Texas Instruments LM2675M-5.0/NOPB is a SIMPLE SWITCHER high-efficiency 1A step-down (buck) voltage regulator with a fixed 5V output, accepting a 6.5V to 40V input range and housed in an 8-pin SOIC (D) package with 0.154 inch (3.90 mm) body width. Designed as a monolithic LMDMOS-based regulator, it requires a minimum number of external components to deliver a complete DC-DC conversion solution. Key specifications include a 1A continuous output current rating, a 260 kHz internal oscillator that enables small magnetics, and ±1.5% output voltage tolerance over the specified input and load range. The fixed 5V version is internally trimmed, while the ADJ variant sets output via an external resistor divider. The LM2675 family falls within the broader category of switching regulators (buck converter -> step-down regulator -> DC-DC converter -> power management IC), designed to replace older three-terminal linear regulators with significantly higher efficiency. The LM2675M-5.0/NOPB features built-in thermal shutdown, cycle-by-cycle current limiting, and an on/off enable input for power sequencing. The internal MOSFET switch and CMOS gate driver are integrated on the same die, eliminating the need for an external power switch. Its wide 6.5V to 40V input range supports 12V and 24V industrial bus rails directly, while the fixed 5V output is well-suited to powering logic, microcontrollers, and 5V subsystems. Typical applications include point-of-load regulation in industrial equipment, distributed 5V rails in automotive subsystems, distributed power architectures fed from 12V or 24V buses, and battery-powered systems where efficiency matters. The low external component count also simplifies manufacturing and reduces BOM cost. When designing with the LM2675, follow the datasheet inductor and capacitor selection guides closely - choosing a low-ESR input capacitor and a Schottky catch diode rated for the switching current is essential for stable operation. The PCB layout should keep the catch diode loop and the feedback trace short to avoid injecting switching noise into the output. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for sourcing, selection, and PCB-level integration of the LM2675M-5.0/NOPB.
LM2676S-ADJ/NOPB - 3A Step-Down Switching Regulator | Texas Instruments
The Texas Instruments LM2676S-ADJ/NOPB is a SIMPLE SWITCHER high-efficiency 3A step-down (buck) DC-DC regulator housed in a 7-pin TO-263 (D2PAK, KTW) surface-mount package with exposed thermal tab. It delivers an adjustable positive output from 1.2V to 37V from an 8V to 40V input rail, with up to 3A continuous load current and typical line/load regulation of better than 1%. A buck (step-down) switching regulator is a power-management IC that converts a higher DC input voltage to a lower DC output voltage by alternately storing energy in an inductor and releasing it to the load through a MOSFET switch. Within the system hierarchy, the LM2676 belongs to the SIMPLE SWITCHER family of non-isolated buck regulators, which sit within DC-DC switching regulators, which themselves are a sub-category of power-management ICs (PMICs). Compared with linear regulators (LDOs), buck converters like the LM2676 trade higher efficiency (typically 75-90%) for added complexity (inductor, catch diode, input/output capacitors) and produce switching ripple that must be filtered. Key features include a fixed 260 kHz switching frequency that allows use of small magnetic components, an internal DMOS power switch rated for 45V, a low quiescent current of 4.2 mA in standby, thermal shutdown, current limit, and an on/off enable control. The TO-263-7K-T package has a low thermal resistance (junction-to-case) of approximately 2 C/W, enabling full-power operation with a small copper heatsink area or none at all in low-duty applications. The device uses TI's classic buck control topology with voltage-mode control and internal compensation, simplifying external component selection. The feedback pin uses an external resistor network, while a soft-start capacitor controls soft-start discharge to limit inrush current during power-up. The high-side DMOS switch achieves low Rds(on) for high efficiency at 3A loads, making the LM2676S-ADJ/NOPB well-suited for medium-power point-of-load conversion. Typical applications include industrial 24V bus regulation, automotive accessory power (post-transient protection), battery-powered equipment, distributed 5V/12V/15V/24V rails in instrumentation, point-of-load regulation downstream of a rectifier, and high-current single-rail or front-end conversion. The wide input-to-output ratio and 3A capability cover most moderate-power distributed-power requirements. Design considerations: the catch diode with current limiting must be a Schottky type rated for the input voltage (e.g., 40V+ SS34), the inductor is typically 22-33 µH for most VIN/VOUT combinations, and the feedback divider must use 1% resistors. Because the LM2676 is not pin-compatible with newer TI WEBENCH-optimized regulators like the LMR33630, redesigns may be required for footprint migration, though the simple external BOM is widely documented and supported.
LM2841XMK-ADJL/NOPB - 300mA 42V Step-Down DC/DC | Texas Instruments
The Texas Instruments LM2841XMK-ADJL/NOPB is a 300 mA, 42 V input-capable SIMPLE SWITCHER® step-down (buck) DC-DC regulator housed in a 6-pin Thin SOT-23 (TSOT-23-6, TI DDC package). It accepts 4.5 V to 42 V inputs and produces an adjustable output from 0.765 V up to 39.48 V, making it well suited to industrial and automotive load-dump-tolerant point-of-load regulation. According to the TI LM2841 product page, the family comprises the LM2840 (100 mA), LM2841 (300 mA), and LM2842 (600 mA), all built around a 0.765 V nominal feedback reference. A buck (step-down) DC-DC converter is a switch-mode power supply topology that efficiently converts a higher DC input voltage into a lower DC output voltage by rapidly chopping the input with an inductor-capacitor filter network, achieving efficiencies that linear regulators cannot match at large input-to-output differentials. Within the broader power management IC hierarchy, the LM2841XMK sits under DC-DC converters -> voltage regulators -> power management ICs -> semiconductors. The TSOT-23-6 (DDC) footprint places it firmly in the surface-mount QFN/SOT family, and its wide VIN range makes it a common choice for 12 V/24 V industrial bus and battery-powered applications. Key features of the LM2841XMK include a wide 4.5 V to 42 V continuous input range, an integrated MOSFET switch that keeps the BOM small, 300 mA continuous output current, a low 0.765 V feedback reference, internal compensation that removes the need for an external compensation network, and a shutdown (SHDN) pin that can implement soft-start with an external RC. Its 1.25 MHz nominal switching frequency allows small ceramic input/output capacitors and a tiny inductor, shrinking the total solution footprint to a few square millimeters on the PCB. Typical applications for the LM2841XMK include 12 V/24 V industrial sensor rails, battery chargers, LED drivers, distributed supply rails in point-of-load systems, and any application that needs to step a wide-range bus down to a logic-level rail. It is frequently selected over linear regulators when the input-to-output differential exceeds ~2 V because of its high efficiency. The thin SOT-23 package has a theta-2-JA around 90 C/W on a standard JEDEC test board, so careful copper-pour thermal management is required when dissipating more than ~0.5 W. When designing with the LM2841XMK, follow the manufacturer datasheet recommended inductor and capacitor values for your specific VOUT, and ensure the input capacitor handles the RMS ripple current at the 1.25 MHz switching frequency. Always check that the peak inductor current stays below the 0.5 A peak switch-current limit when the load transient peaks coincide with minimum VIN. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the TI datasheet alone.
LM2841YMK-ADJL - 300mA 42V Buck Converter | Texas Instruments
The Texas Instruments LM2841YMK-ADJL is a 300 mA, 42 V input-capable PWM DC/DC buck (step-down) switching regulator with adjustable output voltage (0.765 V minimum reference), housed in a 6-pin thin SOT-23 (TSOT-23-6 / DDC) package. It integrates a 0.9 ohm typical low-RDS(ON) internal power switch, enabling typical efficiency of 85 percent from wide-input industrial and consumer rails. The switching frequency is 1500 kHz nominal, allowing the use of small external inductors and ceramic output capacitors. What is a buck converter? A buck converter (step-down DC/DC switching regulator) is a power management device that uses an internal MOSFET switch, an inductor, and a capacitor network to convert a higher DC input voltage to a lower regulated DC output voltage with high efficiency. Buck converters sit in the power management taxonomy as: buck converter -> DC/DC switching regulator -> voltage regulator -> power management IC. They are preferred for higher step-down ratios where linear regulators (LDOs) waste excessive power as heat. Key features include a 4.5 V to 42 V wide input range that tolerates automotive load-dump conditions and 24 V industrial buses, internal compensation that eliminates most external compensation components, and built-in cycle-by-cycle current limit, thermal shutdown, and soft-start on the same enabling reference family. The thin SOT-23-6 footprint occupies approximately 9 mm² of board space, suiting space-constrained point-of-load applications. Architecturally, the device uses a fixed-frequency peak-current-mode control topology. The internal high-side switch commutates the inductor at 1.5 MHz, and the feedback loop regulates the output against the 0.765 V internal reference using an external resistor divider. The peak-current-mode control provides inherent cycle-by-cycle current limiting and simplifies loop compensation. Operating junction temperature spans -40 C to +125 C, supporting automotive and industrial environments. Typical applications include point-of-load regulation for 24 V industrial buses, powering microcontrollers and sensors from unregulated 12 V or 18 V sources, portable and battery-powered systems, LED constant-current drivers, and automotive infotainment and body electronics. The wide input range also supports wall-transformer-fed consumer electronics, telecom point-of-load rails, and distributed supply architectures. When designing with this regulator, ensure the input capacitor and bootstrap capacitor are placed close to the IC pins and that the inductor is sized for 1500 kHz operation (typically 4.7 uH to 22 uH). Calculate power dissipation by (I_OUT × V_DIODE) for the rectifying path and (I_OUT × VIN × (1 - VOUT/VIN)) for the high-side switch, then verify thermal margin against the 31.6 C/W theta_JA in TSOT-23. This page synthesizes distributor stock and pricing, drop-in alternatives across TI and competing brands, and practical PCB/thermal design notes not found in the bare datasheet.
LM3481MMX/NOPB - 2.97-48V Boost/SEPIC/Flyback Controller | TI
The Texas Instruments LM3481MMX/NOPB is a high-efficiency, low-side N-channel MOSFET controller designed for boost, SEPIC, and flyback switching regulator topologies. It operates from an input voltage range of 2.97V to 48V, making it suitable for a wide variety of power supply applications. The device is housed in a 10-pin VSSOP (DGS) package and supports a switching frequency up to 1MHz, allowing for compact magnetic components and reduced board space. A DC-DC switching controller is an integrated circuit that manages the power conversion process by controlling external power switches (typically MOSFETs) to regulate output voltage or current. Unlike linear regulators, switching controllers offer high efficiency, especially when there is a large difference between input and output voltages. The LM3481 belongs to the family of current-mode PWM controllers, which provide robust line and load regulation and simplified loop compensation. This controller is part of the broader category of power management ICs, essential for modern electronic systems. Key features of the LM3481MMX/NOPB include current-mode PWM control, a wide input voltage range, and an adjustable switching frequency up to 1MHz. It also features a built-in soft-start, cycle-by-cycle current limiting, and thermal shutdown protection. The device can drive an external N-channel MOSFET, enabling high-current applications that would be impractical with integrated-switch regulators. Its low quiescent current and high efficiency make it ideal for battery-powered and energy-conscious designs. Technically, the LM3481 uses a current-mode control architecture, which provides inherent feed-forward compensation and simplifies the design of the feedback loop. The controller includes a precision reference, error amplifier, and PWM comparator. It also offers a shutdown pin for power sequencing and a frequency synchronization pin for noise-sensitive systems. The device is specified for operation over the industrial temperature range of -40C to 125C, ensuring reliability in harsh environments. Typical applications include automotive power supplies, industrial power systems, LED drivers, and battery chargers. The wide input range and ability to implement boost, SEPIC, and flyback topologies make it a versatile choice for designers. When designing with the LM3481, careful attention must be paid to the external MOSFET selection, inductor sizing, and loop compensation to ensure stable operation across all load conditions. The datasheet provides detailed design equations and application circuits to guide the designer.
LM3481QMMX/NOPBQ1 - 48V Boost/SEPIC/Flyback Controller | TI
The Texas Instruments LM3481QMMX/NOPBQ1 (LM3481-Q1) is a versatile AEC-Q100 qualified, low-side N-channel FET switching controller designed for boost, SEPIC, and flyback converter topologies. It operates from a wide 2.97V to 48V input supply, supports adjustable switching frequency up to 1MHz, and comes in a 10-pin VSSOP (MSOP, 3.00mm width) surface-mount package. A switching controller is the brain of a switched-mode power supply (SMPS): it drives an external low-side N-FET as the primary switch, regulating the output through current-mode PWM control. As a controller (rather than a monolithic regulator), the LM3481-Q1 lets designers scale output power freely by choosing an external MOSFET, inductor, and sense resistor, making it suitable from a few watts up to tens of watts. Key features include current-mode PWM control with 85% maximum duty cycle, programmable switching frequency (set by a single resistor, up to 1MHz) enabling small magnetics and fast transient response, an internal 5V regulated gate-driver rail for the external N-FET, cycle-by-cycle current limit, thermal shutdown, and a frequency-foldback/soft-start-friendly architecture that simplifies startup in boost applications. Wide 2.97V to 48V VIN supports automotive 12V and 24V rails with load-dump headroom. The LM3481-Q1 is fabricated on a proven analog process, qualified to AEC-Q100 Grade 1 (-40C to +125C ambient), making it suitable for under-hood and in-cabin automotive systems. The VSSOP-10 package has a low profile of 1mm and small footprint for space-constrained designs. Output voltage is set by a feedback divider; the FB reference threshold is specified in the datasheet. Typical applications include automotive LED headlamp and backlight drivers, on-board charger auxiliary supplies, infotainment display boost rails, industrial 24V-to-higher-voltage boost converters, and isolated or non-isolated flyback auxiliaries. Design tip: keep the switch-node and gate-drive loops tight, and size the current-sense resistor for the desired cycle-by-cycle limit while accounting for its power dissipation.
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.
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.