SC1631 Просмотр технического описания (PDF) - Semtech Corporation
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SC1631 Datasheet PDF : 7 Pages
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LOW VOLTAGE STEP-UP
DC-DC CONVERTER
SC1631
January 29, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1631 is a high efficiency step up DC-DC
converter. Only four external components are required
to deliver a fixed voltage of 3V, 3.3V, or 5V. Efficiency
beyond 87% can be easily achieved at 100mA load
with 2.2V to 3V input voltages.
A logic-controlled shutdown mode is provided for
power saving. Switch current limit can be programmed
with a resistor. The low battery detector can be
configured as a linear regulator or a burst mode
controller providing extremely low supply current
operation.
A switching rate of 120kHz reduces the inductor size -
inductors of 25µH to 50µH are recommended for most
applications.
FEATURES
• High efficiency 90%
• Power-saving shutdown mode (7µA typical)
• Internal 2A switch
• 120kHz switching rate
• Adjustable switch current limit
• On-chip low battery detector
APPLICATIONS
• Palmtop and notebook computers
• Pocket organizers
• Cameras
• Pagers
• Battery backup supplies
• Portable instruments
BLOCK DIAGRAM
ORDERING INFORMATION
DEVICE(1)
SC1631CS
SC1631-3CS
SC1631-5CS
OUTPUT VOLTAGE
3.3V
3.0V
5.0V
Note:
(1) Add suffix ‘TR’ for tape and reel.
PACKAGE
SO-8
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Operating
Temperature Range
Storage Temperature
Range
Symbol Maximum
VIN
7.0
TA
0 to 70
TSTG -65 to 125
Units
V
°C
°C
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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