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ST730A

5V STEP-DOWN,

CURRENT-MODE PWM DC-DC CONVERTERS

s

s

s

s

s

s

s

s

s

s

UP TO 450mA LOAD CURRENTS

200kHz HIGH-FREQUENCY

CURRENT-MODE PWM

85% TO 96% EFFICIENCIES

33碌H OR 100碌H PRE-SELECTED

INDUCTOR VALUE, NO COMPONENT

DESIGN REQUIRED

0.8mA QUIESCENT CURRENT

0.3碌A 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

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 0.3碌A

in shutdown mode. The output does not exhibit

frequency over this specified range. Pulse-width

modulation (PWM) current-mode control provides

SCHEMATIC DIAGRAM

precise output regulation and excellent transient

responses.

Output

voltage

accuracy

is

guaranteed to be 鹵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

a 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.

January 2003

1/9

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ST730ABD-TR相關(guān)型號PDF文件下載

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• ST735S
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• ST735T
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• ST735T
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• ST730AB
  英文版
  5V STEP-DOWN, CURRENT-MODE PWM DC-DC CONVERTERS
  
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• ST730AC
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  5V STEP-DOWN, CURRENT-MODE PWM DC-DC CONVERTERS
  
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• ST735CN
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  ST735CN

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