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Semtech Corporation - PROGRAMMABLE DC/DC CONTROLLER

Numéro de référence SC1150
Description PROGRAMMABLE DC/DC CONTROLLER
Fabricant Semtech Corporation 
Logo Semtech Corporation 





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SC1150 fiche technique
PROGRAMMABLE DC/DC
CONTROLLER
SC1150
March 11, 1998
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
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
85% efficiency
4 bit DAC for output programmability
On chip power good and OVP functions
Meets Intel Pentium® Pro VRM8.0 specifications
APPLICATIONS
Pentium® Pro Processor supplies
Pentium® Pro Processor VRM modules
2.0V to 3.5V microprocessor supplies
Programmable power supplies
ORDERING INFORMATION
DEVICE(1)
PACKAGE
TEMP RANGE (TJ)
SC1150CS
SO-16
0 - 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
BLOCK DIAGRAM
1.25V REF
VID3
VID2
VID1
VID0
D/A
1.00V to
1.75V
VCC
VCC
CSm CSp
CURRENT LIMIT
70mV
-
+
OSCILLATOR
R
Q
S
SHUTDOWN
LEVEL SHIFT
AND DRIVE
BST
DH
PGND
VOSENSE
PWRGOOD
VCC
OVP
+
-
+
-
+
-
+
-
ERROR
AMP
-
+
GND
FB
B16997B
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum Units
VCC to GND
PGND to GND
VIN -0.3 to 7 V
±1 V
BST to GND
-0.3 to 15
V
Operating
Temperature Range
Storage
Temperature Range
Lead Temperature
(Soldering) 10 sec
TA
TSTG
TLEAD
0 to 70
-65 to +150
300
°C
°C
°C
GND
VCC
OVP
PWRGOOD
CSm
CSp
PGND
DH
1
2
3
4
5
6
7
8
16 VID0
15 VID1
14 VID2
13 VID3
12 FB
11 VOSENSE
10 SHUTDOWN
9 BST
© 1998 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA

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