PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS - Semtech Corporation
Description
PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS
Preliminary - August 7, 2000
SC1158
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.
semtech.
com
DESCRIPTION
The SC1158 is a low-cost, full featured, synchronous voltage-mode controller designed for use in single ended power supply applications where efficiency is of primary concern.
Synchronous operation allows for the elimination of heat sinks in many applications.
The SC1158 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® ll and K6-2.
Internal level-shift, high-side drive circuitry, and preset shoot-thru control, allows for use of inexpensive N-channel power switches.
SC1158 features include an integrated 4-bit VID DAC, temperature compensated voltage reference, triangle wave oscillator, current limit comparator, frequency shift over-current protection, and an internally compensated error amplifier.
The SC1158 operates at a fixed 140KHz, providing an optimum compromise between efficiency, external component size, and cost.
FEATURES •= Low cost / full featured •= Synchronous operation •= 4 Bit VID DAC programmable output •= Meets Intel VRM8.
2 (Pentium® II) high range •= 1.
5% Reference APPLICATIONS •= Pentium® II, K6-2 Core Supplies •= Multiple Microprocessor Supplies •= Voltage Regulator Modules (VRM) •= Programmable Power Supplies •= High Efficiency DC/DC Conversion ORDERING INFORMATION
DEVICE
(1)
(1% tolerance)
PACKAGE
(2)
TEMP.
RANGE (TJ) 0 - 125°C
SC1158CS.
TR
SO-16NB
Note: (1) Only available in tape and reel packaging.
A reel contains 2500 devices.
(2) “NB” indicates 150 MIL body.
PIN CONFIGURATION BLOCK DIAGRAM
Top View
REF
VCC
CS-
CS+
SHUTDOWN
CURRENT LIMIT REF
BSTH
70mV
+ LEVEL SHIFT AND HIGH SIDE DRIVE
VID3 VID2 VID1 VID0 VOSENSE
D/A
DH
+ ERROR AMP +
R
OSCILLATOR
Q S
SHOOT-THRU CONTROL
GND
BSTL
(16-Pin SOIC)
SYNCHRONOUS MOSFET DRIVE
DL
PGND
Pentium is a registered trademark of Intel Corporation
1
© 2000 ...
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