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LM2596

3.0 A, Step-Down Switching Regulator

ON Semiconductor 

LM2596

3.0 A, Step-Down Switching

Regulator

The LM2596 regulator is monolithic integrated circuit ideally suited

for easy and convenient design of a step−down switching regulator

(buck converter). It is capable of driving a 3.0 A load with excellent

line and load regulation. This device is available in adjustable output

version and it is internally compensated to minimize the number of

external components to simplify the power supply design.

Since LM2596 converter is a switch−mode power supply, its

efficiency is significantly higher in comparison with popular

three−terminal linear regulators, especially with higher input voltages.

The LM2596 operates at a switching frequency of 150 kHz thus

allowing smaller sized filter components than what would be needed

with lower frequency switching regulators. Available in a standard

5−lead TO−220 package with several different lead bend options, and

D2PAK surface mount package.

The other features include a guaranteed $4% tolerance on output

voltage within specified input voltages and output load conditions, and

$15% on the oscillator frequency. External shutdown is included,

featuring 80 mA (typical) standby current. Self protection features

include switch cycle−by−cycle current limit for the output switch, as

well as thermal shutdown for complete protection under fault

conditions.

Features

• Adjustable Output Voltage Range 1.23 V − 37 V

• Guaranteed 3.0 A Output Load Current

• Wide Input Voltage Range up to 40 V

• 150 kHz Fixed Frequency Internal Oscillator

• TTL Shutdown Capability

• Low Power Standby Mode, typ 80 mA

• Thermal Shutdown and Current Limit Protection

• Internal Loop Compensation

• Moisture Sensitivity Level (MSL) Equals 1

• Pb−Free Packages are Available

Applications

• Simple High−Efficiency Step−Down (Buck) Regulator

• Efficient Pre−Regulator for Linear Regulators

• On−Card Switching Regulators

• Positive to Negative Converter (Buck−Boost)

• Negative Step−Up Converters

• Power Supply for Battery Chargers

http://onsemi.com

1

5

TO−220

TV SUFFIX

CASE 314B

Heatsink surface connected to Pin 3

1

5

TO−220

T SUFFIX

CASE 314D

Pin 1. Vin

2. Output

3. Ground

4. Feedback

5. ON/OFF

1

5

D2PAK

D2T SUFFIX

CASE 936A

Heatsink surface (shown as terminal 6 in

case outline drawing) is connected to Pin 3

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 23 of this data sheet.

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 23 of this data sheet.

© Semiconductor Components Industries, LLC, 2008

1

November, 2008 − Rev. 0

Publication Order Number:

LM2596/D

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