ST730A

更新时间： 2024-11-02 22:50:07

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		转换器 DC-DC转换器
页数	文件大小	规格书
9页	262K
描述
5V STEP-DOWN, CURRENT-MODE PWM DC-DC CONVERTERS

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ST730A 数据手册

ST730A

5V STEP-DOWN,

CURRENT-MODE PWM DC-DC CONVERTERS

■

UP TO 450mA LOAD CURRENTS

200kHz HIGH-FREQUENCY

CURRENT-MODE PWM

■

85% TO 96% EFFICIENCIES

33µH OR 100µH PRE-SELECTED

INDUCTOR VALUE, NO COMPONENT

DESIGN REQUIRED

■

0.8mA QUIESCENT CURRENT

0.3µA SHUTDOWN SUPPLY CURRENT

ADJUSTABLE OUTPUT VOLTAGE

OVERCURRENT, SOFT-START AND

UNDERVOLTAGE LOCKOUT PROTECTION

CYCLE-BY-CYCLE CURRENT LIMITING

PACKAGE AVAILABLE: DIP-8 AND SO-8

DIP-8

SO-8

precise output regulation and excellent transient

responses. Output voltage accuracy is

guaranteed to be ±5% over line, load, and

temperature varations.

■

Fixed-frequency switching and absence of

subharmonic ruipple allows easy filtering of output

ripple and noise, as well as the use of small

external components. This regulators require only

DESCRIPTION

The ST730A is a 5V output CMOS, step-down

switching regulator. The ST730A accepts inputs

between 5.2V and 11V and delivers 450mA.

Typical efficiencies are 85% to 96%.

Quiescent supply current is 0.8mA and only 0.3µA

in shutdown mode. The output does not exhibit

frequency over this specified range. Pulse-width

modulation (PWM) current-mode control provides

single inductor value to work in most

applications, so no inductor design is necessary.

Typical applications are: Cellular phones & radios,

portable Instruments, Portable Communications

Equipments and Computer Peripherals.

SCHEMATIC DIAGRAM

January 2003

1/9

12 3 4 5 6 7...9

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