LM2597MX-ADJ National Semiconductor, LM2597MX-ADJ Datasheet

LM2597MX-ADJ

Manufacturer Part Number

LM2597MX-ADJ

Description

Manufacturer

National Semiconductor

Datasheet

1.LM2597HVN-5.0.pdf (34 pages)

Specifications of LM2597MX-ADJ

Case

SOP/8

Date_code

97+

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LM2597/LM2597HV

SIMPLE SWITCHER

Step-Down Voltage Regulator, with Features

General Description

The LM2597/LM2597HV series of regulators are monolithic

integrated circuits that provide all the active functions for a

step-down (buck) switching regulator, capable of driving a

0.5A 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, and are packaged in

an 8-lead DIP and an 8-lead surface mount package.

This series of switching regulators is similar to the LM2594

series, with additional supervisory and performance features

added.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation

fixed-frequency oscillator, Shutdown /Soft-start, error flag

delay and error flag output.

The LM2597/LM2597HV series operates at a switching fre-

quency of 150 kHz thus allowing smaller sized filter compo-

nents than what would be needed with lower frequency

switching regulators. Because of its high efficiency, the cop-

per traces on the printed circuit board are normally the only

heat sinking needed.

A standard series of inductors (both through hole and sur-

face mount types) are available from several different manu-

facturers optimized for use with the LM2597/LM2597HV se-

ries. This

switch-mode power supplies.

Other features include a guaranteed

put voltage under all conditions of input voltage and output

load conditions, and

ternal shutdown is included, featuring typically 85 µA

standby current. Self protection features include a two stage

current limit for the output switch and an over temperature

shutdown for complete protection under fault conditions.

Typical Application

†

SIMPLE SWITCHER

Patent Number 5,382,918.

feature

†

, improved line and load specifications,

and Switchers Made Simple

greatly

15% on the oscillator frequency. Ex-

simplifies

(Fixed Output Voltage Versions)

are registered trademarks of National Semiconductor Corporation.

4% tolerance on out-

DS012440

the

Power Converter 150 kHz 0.5A

design

The LM2597HV is for use in applications requiring and input

voltage up to 60V.

Features

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

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

n Guaranteed 0.5A output current

n Available in 8-pin surface mount and DIP-8 package

n Input voltage range up to 60V

n 150 kHz fixed frequency internal oscillator

n Shutdown /Soft-start

n Out of regulation error flag

n Error output delay

n Bias Supply Pin (V

n Low power standby mode, I

n High Efficiency

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

Applications

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

n Efficient pre-regulator for linear regulators

n On-card switching regulators

n Positive to Negative converter

(57V for HV version)

conditions

efficiency at high input voltages

) for internal circuitry improves

4% max over line and load

typically 85 µA

DS012440-1

December 2000

www.national.com

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