PROGRAMMABLE SYNCHRONOUS DC/DC
CONTROLLER FOR ADVANCED PROCESSORS
April 28, 1998
SC1152
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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
廬
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
ID
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 SC1152 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
FEATURES
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Low cost / full featured
Synchronous operation
5 Bit V
ID
DAC programmable output
On-chip power good and OVP functions
廬
Designed to meet Intel VRM8.1 (Pentium II)
APPLICATIONS
Pentium廬 II (Klamath) Core Supply
Multiple Microprocessor Supplies
Voltage Regulator Modules (VRM)
Programmable Power Supplies
High Efficiency DC/DC Conversion
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SO-20
TEMP. RANGE (T
J
)
0 - 125擄C
SC1152CS
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
VCC
CS(-) CS(+)
CURRENT LIMIT
VCC
VID4
VID3
VID2
VID1
VID0
200 kHz
70mV
+
-
UPPER FET
LEVEL SHIFT
AND DRIVE
BSTH
SHUTDOWN
1.25V REF
D/A AND
SHUT-
DOWN
LOGIC
DECODED SHUTDOWN SIGNAL
R
OSCILLATOR
S
Q
DH
PGNDH
VOSENSE
OPEN COLLECTORS
+
-
PWRGOOD
+
-
SYNCHRONOUS
+
-
ERROR
AMP
-
+
SHOOT-THRU
CONTROL
BSTL
(20-Pin SOIC)
OVP
VCC
+
-
GND
FET
DRIVE
DL
PGNDL
GND
Pentium is a registered trademark of Intel Corporation
1
漏 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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