PROGRAMMABLE DC/DC CONTROLLER
FOR ADVANCED MICROPROCESSORS
March 11, 1998
SC1151
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1151 voltage mode controller contains most of
the circuitry necessary to implement a DC/DC con-
verter for powering advanced microprocessors such
as Klamath, both in single and multiple processor con-
figurations.
The SC1151 features an integrated 5 bit D/A con-
verter, pulse by pulse current limiting, integrated
power good signaling, logic compatible shutdown and
on-board over voltage protection (OVP).
The SC1151 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 programmabil-
ity of output voltage from 2.0V to 3.5V in 100mV in-
crements and 1.80V to 2.05V in 50mV increments with
no external components.
The SC1151 provides an OVP output which can be
used to trigger a crowbar circuit for true over voltage
protection.
FEATURES
鈥?/div>
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鈥?/div>
鈥?/div>
85% efficiency
5 bit DAC for output programmability
On chip power good and OVP functions
Designed for Intel Klamath VRM8.1 requirements
APPLICATIONS
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Klamath microprocessor supplies
Klamath VRM modules
1.8V to 3.5V microprocessor supplies
Programmable power supplies
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SO-16
TEMP RANGE (T
J
)
0擄 to 125擄C
SC1151CS
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
BLOCK DIAGRAM
VCC
CSm
CSp
SHUTDOWN
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
V
IN
Maximum
-0.3 to 7
鹵1
-0.3 to 15
T
A
T
STG
T
LEAD
0 to 70
-65 to +150
300
Units
V
V
V
擄C
擄C
擄C
1.25V REF
VCC
70mV
CURRENT LIMIT
-
BST
+
V
CC
to GND
PGND to GND
BST to GND
VID4
VID3
VID2
VID1
VID0
D/A AND
SHUTDOWN
LOGIC
DECODED SHUTDOWN SIGNAL
LEVEL SHIFT
AND DRIVE
R
OSCILLATOR
S
Q
PGND
DH
VOSENSE
-
+
+
+
-
PWRGOOD
+
-
VCC
+
-
-
ERROR
AMP
OVP
A17043A
GND
Operating
Temperature Range
Storage
Temperature Range
Lead Temperature
(Soldering) 10 sec
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
VID4
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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