LM2594MX-ADJ+ National Semiconductor, LM2594MX-ADJ+ Datasheet

LM2594MX-ADJ+

Manufacturer Part Number

LM2594MX-ADJ+

Description

Manufacturer

National Semiconductor

Datasheet

1.LM2594HVM12NOPB.pdf (28 pages)

Specifications of LM2594MX-ADJ+

Notes

NEW

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LM2594/LM2594HV

SIMPLE SWITCHER

Step-Down Voltage Regulator

General Description

The LM2594/LM2594HV 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 de-

vices are available in fixed output voltages of 3.3V, 5V, 12V,

and an adjustable output version, and are packaged in a

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

Requiring a minimum number of external components, these

regulators are simple to use and feature internal frequency

compensation

line and load regulation specifications.

The LM2594/LM2594HV 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 LM2594/LM2594HV 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

frequency reducing current limit for the output switch and an

over temperature shutdown for complete protection under

fault conditions.

Typical Application

SIMPLE SWITCHER and Switchers Made Simple

feature

†

, a fixed-frequency oscillator, and improved

greatly

15% on the oscillator frequency. Ex-

simplifies

™

(Fixed Output Voltage Versions)

are registered trademarks of National Semiconductor Corporation.

4% tolerance on out-

DS012439

the

Power Converter 150 kHz 0.5A

design

The LM2594HV is for applications requiring an 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 Available in 8-pin surface mount and DIP-8 package

n Guaranteed 0.5A output current

n Input voltage range up to 60V

n Requires only 4 external components

n 150 kHz fixed frequency internal oscillator

n TTL Shutdown capability

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 convertor

(57V for the HV version)

conditions

4% max over line and load

typically 85 µA

DS012439-1

December 1999

www.national.com

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