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PDF SC1151 Data sheet ( Hoja de datos )

Número de pieza SC1151
Descripción PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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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
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 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

1 page




SC1151 pdf
PROGRAMMABLE DC/DC CONTROLLER
FOR ADVANCED MICROPROCESSORS
March 11, 1998
CHARACTERISTIC CURVES
SC1151 Efficiency in Application circuit 16935F
100.0%
Application circuit 16935F Ripple, 3.1V, 10A out
95.0%
90.0%
85.0%
80.0%
75.0%
3.50V Set
3.00V Set
2.40V Set
2.00V Set
70.0%
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
Output Current (Amps)
SC1151
Application circuit 16935F Transient Response, 3.1V, 0.3A to 10A
Vo at Io=300mA steady state
Vo at Io=10A steady state
Steady state voltage
levels are superimposed
for reference.
SC1151 Regulation in Application circuit 16935F
0.050
0.040
0.030
0.020
0.010
0.000
-0.010
-0.020
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0
Output Current (Amps)
© 1998 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA

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