SC1153CSW

Manufacturer Part NumberSC1153CSW
DescriptionSC1153CSWPROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS
ManufacturerSemtech Corporation
SC1153CSW datasheet
 
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PRELIMINARY - October 3, 2000
DESCRIPTION
The SC1153 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
SC1153 is ideal for implementing DC/DC converters
needed to power advanced microprocessors, such as
®
Pentium
lll, in both single and multiple processor con-
figurations. Internal level-shift, high-side drive circuitry,
and preset shoot-thru control, allows for use of inex-
pensive n-channel power switches.
SC1153 features include an integrated 5-bit VID DAC,
temperature compensated voltage reference, triangle
wave oscillator, current limit comparator, frequency
shift over-current protection, and an accessible, inter-
nally compensated error amplifier. Power good signal-
ing, logic compatible shutdown, and over voltage pro-
tection are also provided.
The SC1153 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
PIN CONFIGURATION
Top View
(20-Pin SOIC)
© 2000 SEMTECH CORP.
PROGRAMMABLE SYNCHRONOUS DC/DC
CONTROLLER FOR ADVANCED PROCESSORS
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
=
Low cost / full featured
=
Synchronous operation
=
5 Bit VID programmable output
=
On-chip power good and OVP functions
=
Designed to meet Intel VRM 8.4 (Pentium
=
1.3V to 3.5V Range, 1% tolerance
APPLICATIONS
=
®
Pentium
IlI Core Supply
=
Multiple Microprocessor Supplies
=
Voltage Regulator Modules (VRM)
=
Programmable Power Supplies
=
High Efficiency DC/DC Conversion
ORDERING INFORMATION
(1)
DEVICE
SC1153CSW.TR
Note:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices.
BLOCK DIAGRAM
VCC CS-
CS+
CURRENT LIMIT
1.25V REF
70mV
VID4
VID3
D/A
VID2
OSCILLATOR
VID1
VID0
200kHz
VOSENSE
OPEN COLLECTORS
PWRGOOD
VCC
ERROR
AMP
OVP
GND
Pentium is a registered trademark of Intel Corporation
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC1153
®
IlI)
PACKAGE
TEMP. RANGE (T
)
J
SO-20
0 - 125°C
SHUTDOWN
BSTH
UPPER FET
LEVEL SHIFT
DH
AND DRIVE
R
PGNDH
Q
S
SHOOT-THRU
CONTROL
BSTL
SYNCHRONOUS
DL
FET DRIVE
PGNDL
1

SC1153CSW Summary of contents