LM2596 SIMPLE SWITCHER® 4.5V to 40V, 3A Low Component Count Step-Down Regulator | TI.com

LM2596 (ACTIVE)

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

 

Recommended alternative parts

  • LM43603  -  3.5 to 36V, 3A Synchronous Step-Down Voltage Regulator - Higher efficiency, Low Quiescent Current, Smaller Solution Size
  • LMR14030  -  4 to 40V, 3.5A 2.2MHz Step-Down Voltage Regulator - Low Quiescent Current, Smaller Solution Size
  • LMR23630  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 

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

WEBENCH ® Designer LM2596

  Min   Max Range
Vin -  V 4.5 to 40.0V
Product Option
Vout  V 1.23 to 40V
Iout  A ≤ 3A
Ambient Temp   °C -40 to 125 °C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM2596 Order now 4.5     40     3.3     37     3     1     110     173     5     Enable
Over Current Protection    
Voltage Mode     100     -40 to 125     Catalog     DDPAK/TO-263 | 5
TO-220 | 5    
Converter     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
See datasheet (TO-220)    
LM2575-N Order now 4     40     3.3     37     1     1     42     63     10     Enable
Over Current Protection    
Voltage Mode     98     -40 to 125     Catalog     DDPAK/TO-263 | 5
PDIP | 16
SOIC | 24
TO-220 | 5    
Converter     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
See datasheet (PDIP)
24SOIC: 160 mm2: 10.3 x 15.5 (SOIC | 24)
See datasheet (TO-220)    
LM43603 Order now 3.5     36     1     28     3     1     200     2200     0.027     Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Synchronous Rectification
Tracking    
Current Mode     99     -40 to 125     Catalog     HTSSOP | 16
SON | 16    
Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
See datasheet (SON)    
LMR14030 Order now 4     40     1     36     3.5     1     200     2500     0.04     Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Tracking
UVLO Adjustable    
Current Mode     98     -40 to 125     Catalog     SO PowerPAD | 8     Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LMR23630 Order now 4.5     36     1     30     3     1     200     2200     0.075     Enable
Forced PWM
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable
Wettable Flanks Package    
Current Mode     97     -40 to 125     Catalog     SO PowerPAD | 8
SON | 12