LM2594

更新时间： 2024-09-13 22:55:43

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器稳压器
页数	文件大小	规格书
28页	742K
描述
SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator

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LM2594 数据手册

December 1999

LM2594/LM2594HV

SIMPLE SWITCHER^®Power Converter 150 kHz 0.5A

Step-Down Voltage Regulator

The LM2594HV is for applications requiring an input voltage

up to 60V.

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.

Features

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

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

(57V for the HV version) 4% max over line and load

conditions

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

n Guaranteed 0.5A output current

n Input voltage range up to 60V

Requiring a minimum number of external components, these

regulators are simple to use and feature internal frequency

†

compensation , a fixed-frequency oscillator, and improved

line and load regulation specifications.

n Requires only 4 external components

n 150 kHz fixed frequency internal oscillator

n TTL Shutdown capability

n Low power standby mode, I_Qtypically 85 µA

n High Efficiency

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.

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

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 feature greatly simplifies the design of

switch-mode power supplies.

Applications

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

n Efficient pre-regulator for linear regulators

n On-card switching regulators

Other features include a guaranteed 4% tolerance on out-

put voltage under all conditions of input voltage and output

n Positive to Negative convertor

load conditions, and 15% on the oscillator frequency. Ex-

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 (Fixed Output Voltage Versions)

DS012439-1

™

SIMPLE SWITCHER and Switchers Made Simple are registered trademarks of National Semiconductor Corporation.

DS012439

www.national.com

12 3 4 5 6 7...28

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与LM2594相关器件

型号	品牌	获取价格	描述	数据表
LM2594_16	TI	获取价格	SIMPLE SWITCHER Power Converter 150-kHz 0.5-A Step-Down Voltage Regulator
LM2594-12MDC	NSC	获取价格	1.4A SWITCHING REGULATOR, 173kHz SWITCHING FREQ-MAX, UUC, DIE
LM2594-12MWC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2594-3.3MWC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2594-5.0MDA	TI	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,DIE
LM2594-5.0MDA	NSC	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,DIE
LM2594-5.0MDC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2594-5.0MWA	TI	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,WAFER
LM2594-5.0MWC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2594-ADJMDC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or

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