SC1151CS(1998) 查看數據表（PDF） - Semtech Corporation
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SC1151CS Datasheet PDF : 6 Pages
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PROGRAMMABLE DC/DC CONTROLLER
FOR ADVANCED MICROPROCESSORS
SC1151
March 11, 1998
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
• 85% efficiency
• 5 bit DAC for output programmability
• On chip power good and OVP functions
• Designed for Intel Klamath VRM8.1 requirements
APPLICATIONS
• Klamath microprocessor supplies
• Klamath VRM modules
• 1.8V to 3.5V microprocessor supplies
• Programmable power supplies
ORDERING INFORMATION
DEVICE(1)
PACKAGE TEMP RANGE (TJ)
SC1151CS
SO-16
0° to 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
BLOCK DIAGRAM
VID4
VID3
VID2
VID1
VID0
VCC
CSm CSp
1.25V REF
D/A AND
SHUTDOWN
LOGIC
VCC
DECODED SHUTDOWN SIGNAL
CURRENT LIMIT
70mV
-
+
OSCILLATOR
R
Q
S
SHUTDOWN
LEVEL SHIFT
AND DRIVE
BST
DH
PGND
VOSENSE
+
-
PWRGOOD
+
-
VCC
+
-
OVP
-
+
+
-
ERROR
AMP
GND
A17043A
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
TA
Temperature Range
0 to 70
°C
Storage
TSTG
-65 to +150
°C
Temperature Range
Lead Temperature
TLEAD
300
°C
(Soldering) 10 sec
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
VID4
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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