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參數(shù)資料
| 型號： | ST779ACN |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | DC/DC變換器 |
| 英文描述： | LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| 中文描述： | 低壓輸入，3-3.3V/5V/ADJUSTABLE輸出DC - DC變換器的同步整流 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大小： | 344K |
| 代理商： | ST779ACN |
1/11
October 2002
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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
LOW-COST INDUCTORS
SUPPLY CURRENT OF 270μA (NO LOAD)
SHUTDOWN SUPPLY CURRENT 20μA
PACKAGE AVAILABLE: DIP-8 AND SO-8
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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.
Unlike others step-up DC-DC converters the
ST777/778/779’s Sinchronous Rectifierturns 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.
ST777/778/779
LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT
DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER
V
IN
V
O
22μH
100μF
100μF
R
LIM
I
LIM
L
X
IN
OUT
PGND
SEL
AGND
1
2
3
4
5
6
7
8
SHDN
1.25V
VREF
SHUTDOWN
CONTROL
DELAY
TIMER
OFF
DELAY
TIMER
ON
SWITCH
DRIVER
ACTIVE RECTIFIER
RECTIFIER
CONTROL
1 : N
SCHEMATIC DIAGRAM
SO-8
DIP-8
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