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Номер произв SC1151CS
Описание PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
Производители Semtech Corporation
логотип Semtech Corporation логотип 



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SC1151CS Даташит, Описание, Даташиты
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









No Preview Available !

SC1151CS Даташит, Описание, Даташиты
PROGRAMMABLE DC/DC CONTROLLER
FOR ADVANCED MICROPROCESSORS
SC1151
March 11, 1998
ELECTRICAL CHARACTERISTICS
Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; VOSENSE = VO; 0mV < (CSp-CSm) < 60mV; TA = 25oC
PARAMETER
CONDITIONS
VID MIN TYP MAX UNITS
43210
Output Voltage(2)
IO = 2A in Application circuit 16935F
00101 1.782 1.800 1.818 V
00100 1.832 1.850 1.868
00011 1.881 1.900 1.919
00010 1.931 1.950 1.969
00001 1.980 2.000 2.020
00000 2.030 2.050 2.070
11111 1.980 2.000 2.020
11110 2.079 2.100 2.121
11101 2.178 2.200 2.222
11100 2.277 2.300 2.323
11011 2.376 2.400 2.424
11010 2.475 2.500 2.525
11001 2.574 2.600 2.626
11000 2.673 2.700 2.727
10111 2.772 2.800 2.828
10110 2.871 2.900 2.929
10101 2.970 3.000 3.030
10100 3.069 3.100 3.131
10011 3.168 3.200 3.232
10010 3.267 3.300 3.333
10001 3.366 3.400 3.434
Load Regulation
Line Regulation
IO = 0.3A to 13A(1)
10000 3.465 3.500 3.535
xxxxx
1
xxxxx
0.5
%
%
UV Lockout
xxxxx
4.2 V
Current Limit Voltage
xxxxx 60 70 80
mV
Oscillator Frequency
xxxxx 180 200 220 kHz
Oscillator Max Duty Cycle
xxxxx 90 95
%
DH Sink/Source Current
Output Voltage Tempco
BST - DH = 4.5V, DH - PGND = 2V
xxxxx 1
xxxxx
65
A
ppm/oC
NOTES:
(1) Low output currents, below the continuous conduction threshold will cause an increase in output voltage beyond
the load regulation limit. For Application circuit 16935F see the regulation curve on sheet 5.
(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.
2
652 MITCHELL ROAD NEWBURY PARK CA









No Preview Available !

SC1151CS Даташит, Описание, Даташиты
PROGRAMMABLE DC/DC CONTROLLER
FOR ADVANCED MICROPROCESSORS
SC1151
March 11, 1998
PIN DESCRIPTION
Pin # Pin Name
1 GND
2 VCC
3 OVP
4 PWRGOOD(1)
5 CSm
6 CSp
7 PGND
8 DH
9 BST
10 SHUTDOWN(1)
11 VOSENSE
12 VID4(1)
13 VID3(1)
14 VID2(1)
15 VID1(1)
16 VID0(1)
Pin Function
Small Signal Analog and Digital Ground
Chip Supply Voltage
High Signal out if VO>setpoint + 20%
Open collector logic output, high if VO within
10% of setpoint
Current Sense Input (negative)
Current Sense Input (positive)
Power Ground
High Side Driver Output
Vcc for High Side Driver
Logic low shuts down the converter
Top end of internal feedback chain
Programming Input (MSB)
Programming Input
Programming Input
Programming Input
Programming Input (LSB)
NOTE:
(1) All logic level inputs and outputs are
open collector TTL compatible
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.
3
652 MITCHELL ROAD NEWBURY PARK CA










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