SC1151

Manufacturer Part NumberSC1151
DescriptionPROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
ManufacturerSemtech Corporation
SC1151 datasheet
 
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March 11, 1998
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.
BLOCK DIAGRAM
SHUTDOWN
VCC
CSm
CSp
CURRENT LIMIT
1.25V REF
VCC
-
70mV
+
VID4
DECODED SHUTDOWN SIGNAL
VID3
D/A AND
SHUTDOWN
VID2
LOGIC
R
VID1
Q
OSCILLATOR
VID0
S
VOSENSE
-
+
+
+
-
-
ERROR
AMP
PWRGOOD
+
-
VCC
+
-
OVP
GND
PIN CONFIGURATION
GND
1
16
VCC
2
15
OVP
3
14
PWRGOOD
4
13
CSm
5
12
CSp
6
11
PGND
7
10
DH
8
9
© 1998 SEMTECH CORP.
PROGRAMMABLE DC/DC CONTROLLER
FOR ADVANCED MICROPROCESSORS
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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
(1)
DEVICE
SC1151CS
Note:
(1) Add suffix ‘TR’ for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter
V
to GND
CC
BST
LEVEL SHIFT
AND DRIVE
DH
PGND to GND
PGND
BST to GND
Operating
Temperature Range
Storage
Temperature Range
A17043A
Lead Temperature
(Soldering) 10 sec
VID0
VID1
VID2
VID3
VID4
VOSENSE
SHUTDOWN
BST
652 MITCHELL ROAD NEWBURY PARK CA
SC1151
PACKAGE
TEMP RANGE (T
J
SO-16
0° to 125°C
Symbol
Maximum
Units
V
-0.3 to 7
V
IN
± 1
V
-0.3 to 15
V
T
0 to 70
°C
A
T
-65 to +150
°C
STG
T
300
°C
LEAD
Pentium is a registered trademark of Intel Corporation
)
1

SC1151 Summary of contents

  • Page 1

    ... 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. BLOCK DIAGRAM SHUTDOWN ...

  • Page 2

    ... All VID codes not specifically listed here are invalid and cause shutdown exactly as if the shutdown pin had been asserted. xxxxx refers to any valid VID code. © 1998 SEMTECH CORP. PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS = V ; 0mV < (CSp-CSm) < 60mV; T OSENSE O VID (1) 652 MITCHELL ROAD NEWBURY PARK CA SC1151 MIN TYP MAX UNITS 43210 00101 1.782 1.800 1.818 V 00100 1 ...

  • Page 3

    ... Programming Input (LSB) NOTE: (1) All logic level inputs and outputs are open collector TTL compatible © 1998 SEMTECH CORP. PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS >setpoint + 20% O within O PWRGOOD 652 MITCHELL ROAD NEWBURY PARK CA SC1151 GND 1 16 VID0 VCC 2 15 VID1 OVP 3 14 VID2 ...

  • Page 4

    ... Vendor Notes Various SANYO MV-GX or equiv. Low ESR PHOTRON 8 Turns 16AWG on MICROMETALS T50-52D core PHILIPS Logic level FET, 22m , 30V IRC OAR-1 Series Various Various Various SEMTECH 652 MITCHELL ROAD NEWBURY PARK CA SC1151 C10 5mOhm 1000uF 1000uF 1000uF VCCP + + + + + + ...

  • Page 5

    ... March 11, 1998 CHARACTERISTIC CURVES SC1151 Efficiency in Application circuit 16935F 100.0% 95.0% 90.0% 3.50V Set 85.0% 2.40V Set 80.0% 75.0% 70.0% 0.0 2.0 4.0 6.0 8.0 Output Current (Amps) Application circuit 16935F Transient Response, 3.1V, 0.3A to 10A Vo at Io=300mA steady state Vo at Io=10A steady state © 1998 SEMTECH CORP. PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS Application circuit 16935F Ripple, 3.1V, 10A out 3 ...

  • Page 6

    ... March 11, 1998 OUTLINE DRAWING SO-16 LAND PATTERN SO-16 © 1998 SEMTECH CORP. PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA SC1151 6 ...