LM2596

(ACTIVE) SIMPLE SWITCHER® 4.5V to 40V, 3A Low Component Count Step-Down Regulator

Diagrams

Functional diagram

Typical Application

Typical Performance

Description

The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator.

The LM2596 series operates at a switching frequency of 150 kHz, thus allowing smaller sized filter components than what would be required with lower frequency switching regulators. Available in a standard 7-pin TO-220 package with several different lead bend options, and a 7-pin TO-263 surface mount package.

A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self-protection features include a two stage frequency reducing current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions.

Features

  • 3.3-V, 5-V, 12-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range: 1.2-V
    to 37-V ± 4% Maximum Over Line and Load
    Conditions
  • Available in TO-220 and TO-263 Packages
  • 3-A Output Load Current
  • Input Voltage Range Up to 40 V
  • Requires Only 4 External Components
  • Excellent Line and Load Regulation Specifications
  • 150-kHz Fixed-Frequency Internal Oscillator
  • TTL Shutdown Capability
  • Low Power Standby Mode, IQ, Typically 80 µA
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current-Limit Protection

Parametrics

Vin (Min) (V) 4.5   
Vin (Max) (V) 40   
Vout (Min) (V) 3.3   
Vout (Max) (V) 37   
Iout (Max) (A) 3   
Regulated Outputs (#) 1   
Switching Frequency (Min) (kHz) 110   
Switching Frequency (Max) (kHz) 173   
Iq (Typ) (mA) 5   
Features Enable   
Control Mode Voltage Mode   
Duty Cycle (Max) (%) 100   
Operating Temperature Range (C) -40 to 125   
Rating Catalog   
Package Group DDPAK/TO-263^TO-220   

Companion Products

Technical Documents

Datasheet (1)

Application notes (17)

More literature (1)

Other Products in Same Family

� Texas Instruments Inc. Privacy Terms