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Номер произв SC1150CS
Описание PROGRAMMABLE DC/DC CONTROLLER
Производители Semtech Corporation
логотип Semtech Corporation логотип 



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SC1150CS Даташит, Описание, Даташиты
PROGRAMMABLE DC/DC
CONTROLLER
SC1150
March 11, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1150 voltage mode controller contains most of
the circuitry necessary to implement a DC/DC converter
for powering the Intel Pentium® Pro microprocessor,
both in single and multiple processor configurations.
The SC1150 features an integrated D/A converter,
pulse by pulse current limiting, integrated power good
signaling, logic compatible shutdown and on-board over
voltage protection (OVP).
The SC1150 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 programmability
of output voltage from 2.0V to 3.5V in 100mV incre-
ments with no external components. Both the range
and the increment value may be changed by adding ex-
ternal components.
The SC1150 provides an OVP output which can be
used to trigger a crowbar circuit for true over voltage
protection.
FEATURES
85% efficiency
4 bit DAC for output programmability
On chip power good and OVP functions
Meets Intel Pentium® Pro VRM8.0 specifications
APPLICATIONS
Pentium® Pro Processor supplies
Pentium® Pro Processor VRM modules
2.0V to 3.5V microprocessor supplies
Programmable power supplies
ORDERING INFORMATION
DEVICE(1)
PACKAGE
TEMP RANGE (TJ)
SC1150CS
SO-16
0 - 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
BLOCK DIAGRAM
1.25V REF
VID3
VID2
VID1
VID0
D/A
1.00V to
1.75V
VCC
VCC
CSm CSp
CURRENT LIMIT
70mV
-
+
OSCILLATOR
R
Q
S
SHUTDOWN
LEVEL SHIFT
AND DRIVE
BST
DH
PGND
VOSENSE
PWRGOOD
VCC
OVP
+
-
+
-
+
-
+
-
ERROR
AMP
-
+
GND
FB
B16997B
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 FB
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 !

SC1150CS Даташит, Описание, Даташиты
PROGRAMMABLE DC/DC
CONTROLLER
SC1150
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
Output Voltage(2)
CONDITIONS
IO = 2A in Application circuit 16935E
VID MIN TYP MAX UNITS
3210
1111 1.980 2.000 2.020 V
1110 2.079 2.100 2.121
1101 2.178 2.200 2.222
1100 2.277 2.300 2.323
1011 2.376 2.400 2.424
1010 2.475 2.500 2.525
1001 2.574 2.600 2.626
1000 2.673 2.700 2.727
0111 2.772 2.800 2.828
0110 2.871 2.900 2.929
0101 2.970 3.000 3.030
0100 3.069 3.100 3.131
0011 3.168 3.200 3.232
0010 3.267 3.300 3.333
0001 3.366 3.400 3.434
Load Regulation
Line Regulation
IO = 0.3A to 13A(1)
0000 3.465 3.500 3.535
xxxx
1
xxxx
0.5
%
%
UV Lockout
xxxx
4.2 V
Current Limit Voltage
xxxx 60 70 80 mV
Oscillator Frequency
xxxx 180 200 220 kHz
Oscillator Max Duty
Cycle
xxxx 90 95
%
DH Sink/Source Current BST - DH = 4.5V, DH - PGND = 2V
Output Voltage Tempco
xxxx 1
xxxx
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 16935E 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. xxxx refers to any valid VID code.
© 1998 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA









No Preview Available !

SC1150CS Даташит, Описание, Даташиты
PROGRAMMABLE DC/DC
CONTROLLER
March 11, 1998
PIN DESCRIPTION
Pin # Pin Name
1 GND
2 VCC
3 OVP(1)
4 PWRGOOD(1)
5 CSm
6 CSp
7 PGND
8 DH
9 BST
10 SHUTDOWN(1)
11 VOSENSE
12 FB
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
Voltage Feedback Input
Programming Input (MSB)
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
SC1150
16 VID0
15 VID1
14 VID2
13 VID3
12 FB
11 VOSENSE
10 SHUTDOWN
9 BST
© 1998 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA










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