SC1152 Datasheet, PDF (1/7 Pages) Semtech Corporation – PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS

PROGRAMMABLE SYNCHRONOUS DC/DC
SC1152
CONTROLLER FOR ADVANCED PROCESSORS
April 28, 1998
TEL:[phone] FAX:[phone] 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
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
• Low cost / full featured
• Synchronous operation
• 5 Bit V_ID DAC programmable output
• On-chip power good and OVP functions
• Designed to meet Intel VRM8.1 (Pentium^® II)
APPLICATIONS
• Pentium® II (Klamath) Core Supply
• Multiple Microprocessor Supplies
• Voltage Regulator Modules (VRM)
• Programmable Power Supplies
• High Efficiency DC/DC Conversion
ORDERING INFORMATION
DEVICE⁽¹⁾
SC1152CS
PACKAGE
SO-20
TEMP. RANGE (T_J)
0 - 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
(20-Pin SOIC)
VID4
VID3
VID2
VID1
VID0
VCC
CS(-) CS(+)
1.25V REF
D/A AND
SHUT-
DOWN
LOGIC
CURRENT LIMIT
VCC
70mV +
-
DECODED SHUTDOWN SIGNAL
OSCILLATOR
200 kHz
R
Q
S
VOSENSE
OPEN COLLECTORS
+
-
PWRGOOD
+
-
VCC
+
-
OVP
-
+
-
+
ERROR
AMP
GND
GND
SHUTDOWN
UPPER FET
LEVEL SHIFT
AND DRIVE
SHOOT-THRU
CONTROL
SYNCHRONOUS
FET
DRIVE
BSTH
DH
PGNDH
BSTL
DL
PGNDL
© 1998 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
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