TWO-CHIP Datasheet

IC型號：
TWO-CHIP
PDF描述：
Two-Chip Solution for Mobile CPUs (117k)
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芯片廠家：
ETC

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TWO CHIP SOLUTION FOR

MOBILE CPUs

January 5, 2000

AN99-12

APPLICATION NOTE FOR SC1406A

INTRODUCTION

DESCRIPTION

The SC1406A is a High Speed, High perfor-

mance Hysteretic Mode controller. It is part of

a two chip solution, with the SC1405 Smart

Driver, providing power to advanced micro-

processors. It uses a Dynamic Set Point

switching technique along with an ultra-fast

comparator 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 out-

put voltage settings 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 Un-

dervoltage Lock-Out for the main Hysteretic

controller to assure V-DC is within acceptable

limits. An Over-Current comparator disables

the main controller during an overcurrent

condition using an externally programmable

threshold.

APPLICATIONS

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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

廬

Pentium II & III Processors

FEATURES

鈥?/div>

Laptop and Notebook computers

High performance Microprocessor based

systems

High efficiency distributed power supplies

BLOCK DIAGRAM

漏 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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Two-Chip Solution for Mobile CPUs (117k)

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Two-Chip Solution for Mobile CPUs (117k)

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