SC1150 Datasheet, PDF (1/6 Pages) Semtech Corporation – PROGRAMMABLE DC/DC CONTROLLER

PROGRAMMABLE DC/DC
CONTROLLER
SC1150
March 11, 1998
TEL:[phone] FAX:[phone] 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 (T_J)
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
V_CC to GND
PGND to GND
V_IN
-0.3 to 7
V
±1
V
BST to GND
-0.3 to 15
V
Operating
Temperature Range
T_A
0 to 70
°C
Storage
Temperature Range
T_STG
-65 to +150
°C
Lead Temperature
(Soldering) 10 sec
T_LEAD
300
°C
GND
1
VCC
2
OVP
3
PWRGOOD
4
CSm
5
CSp
6
PGND
7
DH
8
16
VID0
15
VID1
14
VID2
13
VID3
12
FB
11
VOSENSE
10
SHUTDOWN
9
BST
© 1998 SEMTECH CORP.
1
Pentium is a registered trademark of Intel Corporation
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