Datasheet > ST777

ST777

更新时间： 2024-09-26 22:50:07

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		转换器输出元件输入元件 DC-DC转换器
页数	文件大小	规格书
11页	346K
描述
LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER

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中文翻译

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数据手册

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ST777 数据手册

ST777/778/779

LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT

DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER

■

1V TO 6V INPUT GUARANTEES START-UP

UNDER LOAD

MAXIMUM OUTPUT CURRENT OF 300mA

(778 OR 779 ADJUSTED TO 3V)

LOAD FULLY DISCONNECTED IN

SHUTDOWN

■

TYPICAL EFFICIENCY OF 82%

INTERNAL 1A POWER SWITCH AND

SYNCHRONOUS RECTIFIER

ADJUSTABLE CURRENT LIMIT ALLOWS

■

DIP-8

SO-8

LOW-COST INDUCTORS

■

SUPPLY CURRENT OF 270µA (NO LOAD)

SHUTDOWN SUPPLY CURRENT 20µA

PACKAGE AVAILABLE: DIP-8 AND SO-8

Unlike others step-up DC-DC converters the

ST777/778/779’s Sinchronous Rectifier turns off in

the shutdown mode, fully disconnecting the output

from the source. This eliminates the current drain

associated with conventional step-up converters

when off or in shutdown. Supply current is 270µA

under no load and only 20µA in stand by mode.

DESCRIPTION

The ST777/778/779 are dc-dc converters that

step-up from low voltage inputs requiring only

three external components, an inductor (typically

22µH) and two capacitors. The device include a

Sinchronous Rectifier that eliminates the need for

an external catch diode, and allows regulation

even when the input is greater than the output.

SCHEMATIC DIAGRAM

22µH

100µF

RLIM

ILIM

DELAY

TIMER

OFF

ACTIVE RECTIFIER

OUT

SWITCH

DRIVER

DELAY

TIMER

100µF

RECTIFIER

CONTROL

tON

PGND

1 : N

SEL

1.25V

VREF

SHDN

SHUTDOWN

CONTROL

AGND

October 2002

1/11

12 3 4 5 6 7...11

中文翻译

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