PORTABLE PENTIUM II & III
POWER SUPPLY CONTROLLER
January 28, 2000
®
SC1406A
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1406A is a High Speed, High performance
Hysteretic Mode controller. It is part of a two chip solu-
tion, with the SC1405 Smart Driver, providing power
to advanced micro-processors. It uses a Dynamic Set
Point switching technique along with an ultra-fast com-
parator to provide the control signal to an external
high speed Mosfet driver. A 5-bit DAC sets the output
voltage, thus providing a voltage resolution of 25mV.
SC1406A has two on-chip linear regulators which
drive external PNP transistors with output voltage set-
tings of 1.5V and 2.5Vdc. The linear regulator drivers
have a separate soft start. A PWRGD TTL level signal
is asserted when all voltages are within specifications.
The part features Low Battery Detect and Undervolt-
age Lock-Out for the main Hysteretic controller to as-
sure V-DC is within acceptable limits. An Over-Current
comparator disables the main controller during an
overcurrent condition using an externally pro-
grammable threshold.
FEATURES
•
•
•
•
High Speed Hysteretic controller provides high
efficiency over a wide operating load range
Inherently stable
Complete power solution with two LDO drivers
®
Programmable output voltage for Pentium II & III
Processors
APPLICATIONS
•
•
•
Laptop and Notebook computers
High performance Microprocessor based systems
High efficiency distributed power supplies
ORDERING INFORMATION
DEVICE
SC1406ACTS
PACKAGE
TSSOP-28
TEMP. (T
J
)
0 - 125°C
BLOCK DIAGRAM
PIN CONFIGURATION
Top View
TSSOP-28
Pentium is a registered trademark of Intel Corporation
1
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NEWBURY PARK CA 91320
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