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LM2596S-ADJ

3A buck regulator, adjustable 1.23-37V, 4.5-40V in, 150kHz, TO-263-5

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Manufacturer Part：

LM2596S-ADJ

Package：

TO-263-5 / D2PAK (10.16 x 8.42 x 4.57 mm)

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Description

Product Overview

The LM2596S-ADJ from Texas Instruments is a 3A step-down (buck) switching voltage regulator with an adjustable output in a TO-263-5 (D2PAK) package. Operating at 150kHz fixed frequency, it accepts inputs from 4.5V to 40V and delivers up to 3A with output voltage set by an external resistor divider from 1.23V to 37V.

Key Specifications

Output Voltage 1.23V to 37V (adjustable)
Output Current 3A (max)
Input Voltage 4.5V to 40V
Reference Voltage 1.23V (typical)
Switching Frequency 150kHz (fixed)
Efficiency Up to 94%
Standby Current 50uA (typical)
Operating Temperature -40C to +125C
Package TO-263-5 (D2PAK)

Features

  • 3A output current
  • Adjustable output from 1.23V to 37V
  • 150kHz switching frequency
  • Only 5 external components needed
  • Thermal shutdown and current limiting
  • ON/OFF standby pin (50uA)
  • Internal frequency compensation

Applications

  • Custom voltage buck converters
  • Battery chargers
  • LED constant current drivers
  • Distributed power systems

The LM2596S-ADJ is the adjustable output version of TI’s SIMPLE SWITCHER step-down regulator family in a TO-263-5 package. Operating from 4.5V to 40V input, it delivers up to 3A at 150kHz with output voltage programmed by two external resistors from 1.23V to 37V. Only five external components are required. Internal frequency compensation, thermal shutdown, and current limiting simplify design. The ON/OFF pin enables shutdown with 50uA standby current. The adjustable version provides maximum flexibility for custom voltage rails, battery chargers, and LED drivers.

The LM2596S-ADJ operates as a 150kHz fixed-frequency current-mode buck converter. The internal NPN Darlington power switch connects VIN to the inductor when ON, storing energy. When OFF, the external Schottky catch diode conducts for freewheeling. The FB pin senses the output via an external resistor divider (R1 top, R2 bottom). The error amplifier compares FB voltage with the internal 1.23V reference and adjusts duty cycle. VOUT = 1.23V x (1 + R1/R2). Current-mode control provides fast transient response and inherent current limiting. The ON/OFF pin disables the oscillator when pulled below 1.3V.

Pin Name Type Description
1 VIN Input Input supply (4.5V to 40V)
2 OUTPUT Power Switch output; to inductor and catch diode
3 GND Ground Circuit ground; tab also GND
4 Feedback Input Feedback pin; connect resistor divider from VOUT
5 ON/OFF Input Shutdown; LOW = off, HIGH/open = on
  • Custom Voltage Rail: Generates any voltage from 1.23V to 37V (e.g., 7.2V for Li-ion charging) from 12V or 24V input with resistor divider setting the output precisely
  • LED Constant Current Driver: Uses a sense resistor in the feedback path instead of a voltage divider to regulate current through high-power LED strings
  • Variable Lab Supply: Combines with a potentiometer in the feedback divider for adjustable bench power supply from 1.23V to 30V at up to 3A
Model Manufacturer Vout Iout Key Difference
LM2596S-3.3 TI 3.3V 3A Fixed 3.3V version
LM2596S-5.0 TI 5.0V 3A Fixed 5V version
LM2679-ADJ TI Adj 5A Higher current
MP1584EN-LF-Z MPS Adj 3A Higher fsw, smaller solution
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