SC1152CS

Manufacturer Part NumberSC1152CS
ManufacturerSemtech Corporation
SC1152CS datasheet
 
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April 28, 1998
DESCRIPTION
The SC1152 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
SC1152 is ideal for implementing DC/DC converters
needed to power advanced microprocessors such as
®
Pentium
ll (Klamath), in both single and multiple pro-
cessor configurations. Internal level-shift, high-side
drive circuitry, and preset shoot-thru control, allows for
use of inexpensive n-channel power switches.
SC1152 features include an integrated 5-bit V
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 SC1152 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
PIN CONFIGURATION
Top View
(20-Pin SOIC)
© 1998 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 V
DAC programmable output
ID
On-chip power good and OVP functions
Designed to meet Intel VRM8.1 (Pentium
APPLICATIONS
Pentium® II (Klamath) Core Supply
Multiple Microprocessor Supplies
Voltage Regulator Modules (VRM)
Programmable Power Supplies
DAC,
High Efficiency DC/DC Conversion
ID
ORDERING INFORMATION
(1)
DEVICE
PACKAGE
SC1152CS
Note:
(1) Add suffix ‘TR’ for tape and reel.
BLOCK DIAGRAM
VCC
CS(-)
CS(+)
CURRENT LIMIT
1.25V REF
VCC
+
70mV
-
VID4
DECODED SHUTDOWN SIGNAL
D/A AND
VID3
SHUT-
VID2
DOWN
VID1
OSCILLATOR
LOGIC
VID0
200 kHz
VOSENSE
OPEN COLLECTORS
+
+
-
ERROR
-
AMP
PWRGOOD
+
-
VCC
+
-
GND
OVP
GND
Pentium is a registered trademark of Intel Corporation
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC1152
®
II)
TEMP. RANGE (T
)
J
SO-20
0 - 125°C
SHUTDOWN
BSTH
UPPER FET
DH
LEVEL SHIFT
R
AND DRIVE
Q
S
PGNDH
-
SHOOT-THRU
+
CONTROL
BSTL
SYNCHRONOUS
DL
FET
DRIVE
PGNDL
1

SC1152CS Summary of contents