PROGRAMMABLE DC/DC
CONTROLLER
March 11, 1998
SC1150
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1150 voltage mode controller contains most of
the circuitry necessary to implement a DC/DC converter
廬
for powering the Intel Pentium Pro microprocessor,
both in single and multiple processor configurations.
The SC1150 features an integrated D/A converter,
pulse by pulse current limiting, integrated power good
signaling, logic compatible shutdown and on-board over
voltage protection (OVP).
The SC1150 operates at a fixed frequency of 200kHz,
providing an optimum compromise between size, effi-
ciency and cost in the intended application areas.
The integrated D/A converter provides programmability
of output voltage from 2.0V to 3.5V in 100mV incre-
ments with no external components. Both the range
and the increment value may be changed by adding ex-
ternal components.
The SC1150 provides an OVP output which can be
used to trigger a crowbar circuit for true over voltage
protection.
FEATURES
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85% efficiency
4 bit DAC for output programmability
On chip power good and OVP functions
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Meets Intel Pentium Pro VRM8.0 specifications
APPLICATIONS
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Pentium Pro Processor supplies
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Pentium Pro Processor VRM modules
2.0V to 3.5V microprocessor supplies
Programmable power supplies
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ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SO-16
TEMP RANGE (T
J
)
0 - 125擄C
SC1150CS
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
BLOCK DIAGRAM
VCC
CSm
CSp
SHUTDOWN
1.25V REF
VCC
70mV
CURRENT LIMIT
-
BST
+
ABSOLUTE MAXIMUM RATINGS
Parameter
V
CC
to GND
PGND to GND
BST to GND
-
+
+
Symbol
V
IN
Maximum
-0.3 to 7
鹵1
-0.3 to 15
Units
V
V
V
擄C
擄C
擄C
VID3
VID2
VID1
VID0
D/A
1.00V to
1.75V
OSCILLATOR
S
R
Q
LEVEL SHIFT
AND DRIVE
DH
PGND
VOSENSE
+
-
PWRGOOD
+
-
VCC
+
-
-
ERROR
AMP
Operating
Temperature Range
B16997B
Storage
Temperature Range
Lead Temperature
(Soldering) 10 sec
T
A
T
STG
T
LEAD
0 to 70
-65 to +150
300
OVP
GND
FB
PIN CONFIGURATION
GND
VCC
OVP
PWRGOOD
CSm
CSp
PGND
DH
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VID0
VID1
VID2
VID3
FB
VOSENSE
SHUTDOWN
BST
Pentium is a registered trademark of Intel Corporation
1
漏 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA
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