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LM2576R-ADJ

3A adjustable step-down switching regulator, 4-40V input, 52kHz, TO-263-5 (D2PAK)

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Manufacturer Part：

LM2576R-ADJ

Package：

TO-263-5 (D2PAK, 10.3 x 8.6mm)

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Description

Product Overview

The LM2576R-ADJ from Texas Instruments is a 3A step-down switching voltage regulator with adjustable output from 1.23V to 37V. Operating at 52kHz switching frequency in a TO-263-5 (D2PAK) package, it requires minimal external components and achieves up to 88% efficiency.

Key Specifications

Input Voltage 4V – 40V
Output Current 3A
Output Voltage 1.23V – 37V (adjustable)
Switching Frequency 52kHz
Efficiency Up to 88%
Saturation Voltage 1.5V (typ) @3A
Quiescent Current 5mA (typ)
Shutdown Current 50µA
Operating Temperature -40°C to +125°C
Package TO-263-5 (R suffix, D2PAK)

Features

  • Only 4 external components required for a complete regulator
  • Adjustable output from 1.23V to 37V with 1% feedback reference
  • 52kHz fixed frequency for simple filter design
  • Built-in thermal shutdown and current limit protection
  • 50µA standby current in shutdown mode
  • Industry-standard pinout compatible with LM2575/LM2577

Applications

  • 12V/24V to 5V/3.3V step-down conversion
  • Battery charger and automotive power supplies
  • Distributed power system pre-regulation
  • Simple and cost-effective buck regulator designs

The LM2576R-ADJ from Texas Instruments is a classic 3A step-down switching voltage regulator with an adjustable output range of 1.23V to 37V. Its simplicity is a key advantage – only an inductor, catch diode, input capacitor, output capacitor, and two feedback resistors are needed for a complete regulator. The 52kHz fixed switching frequency simplifies inductor selection and EMI filtering. Packaged in a TO-263-5 (D2PAK) surface-mount outline, it provides excellent thermal performance for medium-power buck conversion applications.

The LM2576R-ADJ uses a fixed-frequency (52kHz) current-mode buck regulator topology. The internal oscillator generates a fixed-frequency clock that turns on the integrated NPN power transistor. The current through the transistor (and inductor) is sensed and compared with the error amplifier output. When the peak current threshold is reached, the transistor turns off and the catch diode conducts, allowing the inductor current to freewheel. The error amplifier compares the feedback voltage (from the external resistor divider) with the 1.23V internal reference, adjusting the duty cycle to maintain the desired output voltage. Current limiting and thermal shutdown provide fault protection.

Pin Name Description
1 VIN Input supply (4-40V)
2 Output Switching output (inductor connection)
3 GND Ground
4 Feedback Output voltage feedback (1.23V reference)
5 /ON-OFF Shutdown control (active low)
  • 12V automotive to 5V/3.3V step-down power supply
  • 24V industrial bus to lower voltage rail conversion
  • Battery-powered equipment voltage regulation
  • Simple and cost-effective distributed power regulation
Model Manufacturer Vin Iout Frequency
LM2576-5.0 TI 4-40V 3A 52kHz
LM2596-ADJ TI 4-40V 3A 150kHz
XL4015 XLSEMI 8-36V 5A 180kHz
AP1509-ADJ BCD 4.5-40V 2A 150kHz
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

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Contact Information

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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