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ST777 Datasheet(Fiches technique) 1 Page - STMicroelectronics

Numéro de pièce ST777
Description  LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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 1 page
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1/11
October 2002
s
1V TO 6V INPUT GUARANTEES START-UP
UNDER LOAD
s
MAXIMUM OUTPUT CURRENT OF 300mA
(778 OR 779 ADJUSTED TO 3V)
s
LOAD FULLY DISCONNECTED IN
SHUTDOWN
s
TYPICAL EFFICIENCY OF 82%
s
INTERNAL 1A POWER SWITCH AND
SYNCHRONOUS RECTIFIER
s
ADJUSTABLE CURRENT LIMIT ALLOWS
LOW-COST INDUCTORS
s
SUPPLY CURRENT OF 270µA (NO LOAD)
s
SHUTDOWN SUPPLY CURRENT 20µA
s
PACKAGE AVAILABLE: DIP-8 AND SO-8
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 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.
ST777/778/779
LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT
DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER
VIN
VO
22µH
100µF
100µF
RLIM
ILIM
LX
IN
OUT
PGND
SEL
AGND
1
2
3
4
5
6
7
8
SHDN
1.25V
VREF
SHUTDOWN
CONTROL
DELAY
TIMER
DELAY
TIMER
tOFF
tON
SWITCH
DRIVER
ACTIVE RECTIFIER
RECTIFIER
CONTROL
1: N
SCHEMATIC DIAGRAM
SO-8
DIP-8




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