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LM2596

3A step-down buck regulator, 4.5-40V input, 150kHz, up to 92% efficiency

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Manufacturer Part：

LM2596

Package：

TO-263-5 (D2PAK) / TO-220-5

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Description

Product Overview

The LM2596 from Texas Instruments is a 3A step-down (buck) switching voltage regulator available in fixed output versions (3.3V, 5V, 12V) and an adjustable version (1.2V to 37V). Operating at 150kHz switching frequency, it provides high efficiency up to 92% in a 5-pin TO-263 or TO-220 package.

Key Specifications

Output Current 3A
Input Voltage 4.5V to 40V
Output Voltage 3.3V/5V/12V fixed or 1.2-37V adjustable
Switching Frequency 150kHz
Efficiency Up to 92%
Line Regulation 0.5% (typ)
Load Regulation 1% (typ)
Package TO-263-5 (D2PAK) / TO-220-5
Operating Temperature -40 to +125 C

Features

  • 3A output current capability
  • 150kHz fixed switching frequency
  • Internal thermal shutdown and current limiting
  • Requires only 4 external components
  • Adjustable and fixed output versions
  • Standby mode with 50uA quiescent current

Applications

  • Automotive and battery-powered systems
  • Distributed power architectures
  • Pre-regulator for linear regulators
  • Positive-to-negative conversion (buck-boost)

The LM2596 is a monolithic integrated circuit from Texas Instruments that provides all the active functions for a step-down (buck) switching regulator capable of driving a 3A load with excellent line and load regulation. Available in fixed 3.3V, 5V, 12V output versions and an adjustable version (1.2V to 37V), it requires a minimum number of external components. The 150kHz switching frequency allows the use of smaller and lower cost inductors and capacitors. Internal features include thermal shutdown, current limiting, and an on/off standby mode that reduces quiescent current to 50uA.

The LM2596 uses a fixed-frequency pulse-width modulation (PWM) control scheme operating at 150kHz. The internal power switch (Darlington NPN) connects the input voltage to the output inductor during the on-time, storing energy in the inductor’s magnetic field. During the off-time, the inductor current flows through the external catch diode to the load and output capacitor. The feedback comparator monitors the output voltage and adjusts the duty cycle to maintain regulation. Current mode control provides inherent cycle-by-cycle current limiting. The thermal shutdown circuit disables the switch when junction temperature exceeds approximately 150C.

Pin Name Function
1 VIN Input supply voltage (4.5-40V)
2 OUTPUT Switch output (connect to inductor)
3 GND Ground
4 FEEDBACK Output voltage feedback (connect to output or resistor divider)
5 ON/OFF Shutdown control (LOW = on, HIGH = off)
  • Automotive 12V/24V to 5V/3.3V power conversion for MCU and logic rails
  • Battery-powered equipment needing efficient voltage step-down
  • Industrial distributed power converting 24V bus to lower voltages
  • Pre-regulator feeding an LDO for clean, efficient power supply design
Model Manufacturer Key Difference
LM2596HV TI High-voltage version, up to 60V input
LM2676 TI 3A, 260kHz, synchronous version
MP1584EN MPS 4A, 1.5MHz, smaller inductor
XL4015 XLSEMI 5A, 180kHz, higher current
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Service & Packaging

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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