SC1631 Datasheet, PDF (1/7 Pages) Semtech Corporation – LOW VOLTAGE STEP-UP DC-DC CONVERTER

LOW VOLTAGE STEP-UP
DC-DC CONVERTER
SC1631
January 29, 1998
TEL:[phone] FAX:[phone] 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
V_IN
7.0
T_A
0 to 70
T_STG -65 to 125
Units
V
°C
°C
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320