SC1402 Datasheet, PDF (1/18 Pages) Semtech Corporation – Multi-Output, Low-Noise Power Supply Controller for Notebook Computers

Multi-Output, Low-Noise Power Supply
Controller for Notebook Computers
SC1402
December 15, 2000
TEL:[phone] FAX:[phone] WEB:http://www.semtech.com
DESCRIPTION
The SC1402 is pin compatible with the MAX1632 with
improved load regulation performance. The SC1402 is
a multiple-output power supply controller designed to
power logic supply components in battery operated
systems. The SC1402 utilizes synchronous rectified
buck topologies to generate two voltages, (3.3V and
5V) with up to 95% efficiency. It also provides two lin-
ear regulators for system housekeeping functions. The
12V linear regulator output is generated from a coupled
inductor of the 5V switching regulator.
Control functions include: power up sequencing, soft
start, power-good signaling, automatic bootstrapping
for high side MOSFETs, and frequency synchroniza-
tion. An internal precision 2.5V reference ensures ±2%
output voltage. The internal oscillator can be adjusted
to 200kHz, 300kHz or synchronized to an external
clock. The MOSFET drivers provide 1A peak drive
current for fast MOSFET switching.
The SC1402 includes a PSAVE enable input to select
a pulse skipping mode for high efficiency or a fixed fre-
quency mode for low noise operation.
FEATURES
•= 6V to 30V Input range
•= 3.3V and 5V dual synchronous rectified outputs
•= Fixed frequency or PSAVE for maximum efficiency
over wide load current range
•= 5V/50mA linear regulator
•= 12V/120mA linear regulator
•= Precision 2.5V reference output
•= Programmable power-up sequence
•= Power good output (RESET)
•= Output over current protection
•= Output over voltage protection
•= Output under voltage shut down
•= 4µA typical shut down current
•= 7mW typical quiescent power
APPLICATIONS
•= Notebook and subnotebook computers
•= PDAs and Mobile communicators
•= Desktop DC-DC converters
ORDERING INFORMATION:
DEVICE
PACKAGE⁽¹⁾
SC1402ISS
SSOP-28
TEMP. (T_A)
-40 - +85°C
TYPICAL APPLICATION CIRCUIT
Note:
(1) Only available in tape and reel packaging. (Suffix ‘.TR’).
© 2000 SEMTECH CORP.
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