SC1406A Datasheet, PDF (1/17 Pages) Semtech Corporation – PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER

PORTABLE PENTIUM^® II & III
POWER SUPPLY CONTROLLER
SC1406A
January 28, 2000
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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
BLOCK DIAGRAM
TEMP. (T_J)
0 - 125°C
PIN CONFIGURATION
Top View
TSSOP-28
© 2000 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
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