UMW LM2596 Overview
The UMW LM2596 is a monolithic 3A step-down (buck) switching voltage regulator IC that integrates all active circuitry required for a complete, high-efficiency non-isolated DC/DC buck converter — making it one of the simplest and most popular fixed-frequency buck regulators in the industry. Operating at a fixed switching frequency of 150kHz, the LM2596 allows the use of physically smaller inductors and filter capacitors than lower-frequency equivalents such as the 52kHz LM2576, reducing the total size and cost of the passive power stage. UMW manufactures the LM2596 in fixed-output versions of 3.3V, 5V, and 12V, and an adjustable (ADJ) version covering 1.2V to 37V — extended to 57V in the LM2596HV high-voltage variant — with the output set by a simple external resistor divider.
Only four external components are required to complete the converter circuit: an inductor, a Schottky rectifier diode, and input and output filter capacitors. Internal frequency compensation eliminates the external RC compensation network needed by many competing buck controller ICs, directly reducing component count and simplifying PCB layout for engineers at all experience levels. Output voltage regulation is guaranteed at ±4% maximum over line and load conditions — sufficient for powering digital logic, microcontrollers, and industrial signal processing circuits. A TTL-compatible shutdown/enable pin allows the regulator to be placed in a low-power standby mode drawing just 80µA quiescent current, making the UMW LM2596 well-suited to battery-powered and power-sequenced systems where standby efficiency matters.
Integrated thermal shutdown and output current limiting provide robust protection against overload and short-circuit conditions, allowing the UMW LM2596 to recover automatically once the fault is cleared. The device is available in three package options — TO-220 (through-hole, 5-lead), TO-220B (alternative lead bend), and TO-263 (surface-mount D2PAK, 5-lead) — providing design flexibility across a wide range of PCB and heatsinking configurations. All three packages share an identical pinout, enabling a single schematic to support multiple PCB layout variants. ABL Semi distributes the UMW LM2596 as a fully authentic, original UMW factory product, with flexible MOQ and compliance documentation for UK and European customers.
Key Specifications
| Parameter | Value |
|---|---|
| Topology | Fixed-Frequency PWM Buck (Step-Down) Switching Regulator |
| Input Voltage Range (VIn) | 4.75V to 40V (60V for HV version) |
| Guaranteed Output Current (IOut) | 3A |
| Fixed Output Voltage Options | 3.3V, 5V, 12V |
| Adjustable Output Voltage Range | 1.2V to 37V (57V for LM2596HV) |
| Output Voltage Accuracy | ±4% maximum over line and load |
| Switching Frequency | 150kHz (fixed) |
| External Components Required | 4 (inductor, diode, input and output capacitors) |
| Internal Compensation | Yes — no external compensation required |
| Standby Quiescent Current | 80µA typical |
| Shutdown / Enable | TTL-compatible input pin |
| Protections | Thermal shutdown, output current limiting |
| Package Options | TO-220 (5-lead), TO-220B, TO-263 (D2PAK, 5-lead) |
Applications
The UMW LM2596 is one of the most universally applicable buck regulator ICs, suited to any system requiring a high-efficiency step-down power conversion stage at up to 3A from input rails up to 40V (60V for HV). Primary application areas include industrial 24V to 5V/3.3V point-of-load converters, automotive accessory power supplies, embedded system power rails, LED driver input regulators, and benchtop power supply modules. The device is equally well-suited to solar energy charge controllers, CCTV and IP camera power stages, robotics onboard power distribution, and general-purpose DC-DC power boards, where its simplicity, wide input range, selectable output voltages, and TO-220/TO-263 package options provide a reliable and cost-efficient regulated power solution.
Pin-to-Pin Compatible Alternatives
The UMW LM2596 shares its part number, pinout, and TO-220/TO-263 package dimensions with the original TI LM2596 and equivalent devices from multiple manufacturers, enabling a direct board-level substitution to reduce procurement cost and establish secondary supply sources without any circuit modification.
| Reference Part Number | Original Manufacturer | Why Choose UMW LM2596 |
|---|---|---|
| LM2596S-5.0/NOPB | Texas Instruments | The original reference LM2596 in TO-263; UMW LM2596 is a direct pin-for-pin replacement with identical electrical specification and package, at a lower unit cost with flexible MOQ from ABL Semi UK stock |
| LM2596T-5.0/NOPB | Texas Instruments | TI’s TO-220 variant of the LM2596; UMW LM2596 provides the same guaranteed 3A/150kHz performance with identical footprint and lead configuration — a direct authorised-equivalent replacement |
| NCV2596D2T-5.0R4G | onsemi | onsemi’s 3A buck regulator in TO-263; UMW LM2596 provides a pin-compatible alternative with equivalent ±4% output tolerance and the same internal compensation and shutdown features at reduced cost |
| LM2676S-5.0/NOPB | Texas Instruments | Higher-frequency (260kHz) 3A buck in TO-263; for designs where 150kHz is sufficient, UMW LM2596 offers a lower-cost alternative using readily available standard inductors without the need for smaller, premium magnetics |
| MC34063ADR2G | onsemi | Classic step-down controller in SOP-8; UMW LM2596 provides a higher-integration alternative in TO-220/TO-263 with a guaranteed 3A switch, internal compensation, and TTL shutdown in a single device |
Frequently Asked Questions
Is UMW LM2596 RoHS compliant?
Yes. The UMW LM2596 is fully RoHS compliant. UMW manufactures the LM2596 in accordance with EU RoHS Directive 2011/65/EU, ensuring the device is free from restricted hazardous substances including lead and mercury. ABL Semi can provide full compliance and trade documentation upon request to support UK and European regulatory and procurement requirements.
What are the pin-to-pin replacements for UMW LM2596?
The UMW LM2596 is a direct pin-to-pin replacement for the Texas Instruments LM2596S and LM2596T series, and is footprint-compatible with the onsemi NCV2596 in the same TO-220 and TO-263 packages — all sharing an identical 5-lead pinout and 3A/150kHz buck regulator architecture. Refer to the compatibility table above for a detailed comparison.
What is the minimum order quantity (MOQ) for UMW LM2596?
ABL Semi offers flexible MOQ for UMW LM2596, supporting both prototype quantities and mass production orders. Contact us for current stock and pricing.
What package options are available for UMW LM2596?
The UMW LM2596 is available in three package options: TO-220 (5-lead through-hole), TO-220B (an alternative lead bend variant of the TO-220 for different PCB mounting orientations), and TO-263 (D2PAK, 5-lead surface-mount). All three packages share an identical 5-pin electrical connection arrangement, allowing the same PCB schematic to be used across multiple layout variants — useful for designs that need to support both through-hole and SMD assembly options. The TO-263 surface-mount package is generally preferred for automated production, while the TO-220 through-hole variants are favoured in prototype and repair applications. Contact ABL Semi to confirm stock availability for your preferred package and output voltage variant.
What inductor value is recommended for the UMW LM2596 and how is it selected?
Inductor selection for the UMW LM2596 depends on the input voltage, output voltage, and maximum output current of the application. Texas Instruments’ original LM2596 datasheet provides a widely used inductor selection chart — this guidance applies directly to the UMW LM2596 given the identical electrical specification. As a general rule, inductors in the range of 68µH to 330µH are appropriate for most 3A applications at 150kHz, with the specific value determined by the desired peak-to-peak inductor ripple current (typically 20–40% of IOut). The inductor must be rated for the full 3A continuous output current with adequate saturation current margin — typically 4A or above. Shielded inductors are recommended in noise-sensitive designs to reduce electromagnetic interference. Standard off-the-shelf inductors in this value range are widely available and cost-effective, making the UMW LM2596 an easy-to-source, easy-to-design-with solution.
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