LM2596 데이터 시트보기 (PDF) - Estek Electronics Co. Ltd

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LM2596

3A Step-Down Voltage Regulator

Estek Electronics Co. Ltd 

LM2596

GENERAL 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 3A load with

excellent line and load regulation. These devices are available

in fixed output voltages of 3.3V, 5V, 12V, 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 needed with lower frequency switching regulators.

Available in a standard 5-lead TO-220 package with several

different lead bend options, and a 5-lead 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 guaranteed 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 over

temperature shutdown for complete protection under fault

conditions.

FEATURES

 3.3V, 5V, 12V, and adjustable output versions

 Adjustable version output voltage range, 1.2V to 37V

 4% max over line and load conditions

 Available in TO-220 and TO-263 packages

 Guaranteed 3A output load current

 Input voltage range up to 40V

 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

APPLICATIONS

 Simple high-efficiency step-down (buck) regulator

 On-card switching regulators

 Positive to negative converter

TYPICAL APPLICATION (Fixed Output Voltage Versions)

12V

+ VIN

4

L1

5.0V

+ 1 5.0 2

CIN 5

3

+ COUT

680F

220

F

BLOCK DIAGRAM

ON/ OFF

FEEDBACK

GM

R2

+

AMP

-

Active

capacitor +

-

2.5V

START

UP

++

+

COM

-

-

COM

+

-

LATCH

DRIVER

+

150kHz

OSC

VIN

OUTPUT

GND

BEIJING ESTEK ELECTRONICS CO.,LTD

1

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