LM2596-3.3 データシートの表示（PDF） - First Components International

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LM2596-3.3

Simple switcher Power Converter 150kHz 3A Step-Down Voltage Regulator

First Components International 

LM2596 Simple switcher Power Converter 150kHz

3A Step-Down Voltage Regulator

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 UA 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 UA

• 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 LM2596 4

L1

5.0V

+ 1 5.0 2

CIN 5

3

+COUT

680µF

220µF

BLOCK DIAGRAM

ON/OFF

FEEDBACK

GM

R2

+

AMP

-

Active

capacitor +

-

2.5V

START

UP

++

+

COM

-

-

COM

+

-

LATCH

DRIVER

+

150kHz

OSC

VIN

OUTPUT

GND

1

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