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PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
March 11, 1998
SC1151
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 converter for powering advanced microprocessors such as Klamath, both in single and multiple processor configurations. The SC1151 features an integrated 5 bit D/A converter, 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, efficiency 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 increments 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 SO-16
TEMP RANGE (TJ) 0 to 125C
SC1151CS
Note: (1) Add suffix `TR' for tape and reel.
BLOCK DIAGRAM
VCC CSm CSp SHUTDOWN
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol VIN Maximum -0.3 to 7 1 -0.3 to 15 TA TSTG TLEAD 0 to 70 -65 to +150 300 Units V V V C C C
1.25V REF
VCC 70mV
CURRENT LIMIT BST +
VCC to GND PGND to GND BST to GND
VID4 VID3 VID2 VID1 VID0
D/A AND SHUTDOWN LOGIC
DECODED SHUTDOWN SIGNAL LEVEL SHIFT AND DRIVE R OSCILLATOR S Q PGND DH
VOSENSE
+ + + PWRGOOD + VCC + ERROR AMP
OVP
A17043A
GND
Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 sec
PIN CONFIGURATION
GND VCC OVP PWRGOOD CSm CSp PGND DH 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VID0 VID1 VID2 VID3 VID4 VOSENSE SHUTDOWN BST
Pentium is a registered trademark of Intel Corporation
1
(c) 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA
PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
March 11, 1998
SC1151
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 16935F VID MIN 43210 TYP MAX UNITS V
00101 1.782 1.800 1.818 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 10000 3.465 3.500 3.535
Load Regulation Line Regulation UV Lockout Current Limit Voltage Oscillator Frequency Oscillator Max Duty Cycle DH Sink/Source Current Output Voltage Tempco
IO = 0.3A to 13A
(1)
xxxxx xxxxx xxxxx xxxxx xxxxx xxxxx 60 180 90 1
1 0.5 4.2 70 200 95 80 220
% % V mV kHz % A ppm/oC
BST - DH = 4.5V, DH - PGND = 2V
xxxxx xxxxx
65
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.
2 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA
PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
March 11, 1998
SC1151
PIN DESCRIPTION
Pin # Pin Name GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
VCC OVP PWRGOOD
(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
GND VCC OVP PWRGOOD CSm 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VID0 VID1 VID2 VID3 VID4 VOSENSE SHUTDOWN BST
CSm CSp PGND DH BST SHUTDOWN VOSENSE VID4 VID3 VID2 VID1 VID0
(1) (1)
CSp PGND DH
Logic low shuts down the converter Top end of internal feedback chain Programming Input (MSB) Programming Input Programming Input Programming Input Programming Input (LSB)
(1)
(1)
(1) (1)
NOTE: (1) All logic level inputs and outputs are open collector TTL compatible
3 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA
PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
March 11, 1998
SC1151
APPLICATION CIRCUIT
Q1 5V IN BUK556 L1 4uH R1 5mOhm C6 1000uF C8 1000uF C10 1000uF VCCP
+ C3 1000uF C1 0.1uF + C2 1000uF C4 1000uF + R2 10k R5 10 D1 PSR16C30CT +
+
+
+
+
+
C5 1000uF
C7 1000uF
C9 1000uF
C12 0.1uF
12V IN
R3
2.32k
R4 1.00k
U1 2 OVP VID0 VID1 VID2 VID3 VID4 3 16 15 14 13 10 1 SHUTDOWN PWRGD SC1151CS VCC OVP VID0 VID1 VID2 VID3 SHUTDOWN GND CSp CSm VOSENSE PWRGOOD VID4 BST DH PGND 6 5 11 4 12 9 8 7
C11 0.1uF
REF 16935F
C13 0.1uF
MATERIALS LIST
Quantity Reference 4 9 1 1 1 1 1 1 1 1 1 Part/Description Vendor Various SANYO PHOTRON 8 Turns 16AWG on MICROMETALS T50-52D core PHILIPS IRC Various Logic level FET, 22m, 30V OAR-1 Series MV-GX or equiv. Low ESR Notes C1,C11-C13 0.1F Ceramic C2-C10 D1 L1 Q1 R1 R2 R3 R4 R5 U1 1000F/6.3V PSR16C30CT 4H BUK556 5m 10k, 5%, 1/8W
2.32k, 1%, 1/8W Various 1k, 1%, 1/8W 10, 5%, 1/8W SC1151CS Various Various SEMTECH
4 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA
PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
March 11, 1998
SC1151
CHARACTERISTIC CURVES
SC1151 Efficiency in Application circuit 16935F
100.0%
Application circuit 16935F Ripple, 3.1V, 10A out
95.0%
90.0%
3.50V Set
Efficiency
3.00V Set 85.0% 2.40V Set
80.0%
2.00V Set
75.0%
70.0% 0.0 2.0 4.0 6.0 8.0 10.0 12.0
14.0
Output Current (Amps)
Application circuit 16935F Transient Response, 3.1V, 0.3A to 10A
SC1151 Regulation in Application circuit 16935F
0.050
Vo at Io=300mA steady state
Voltage change (V) normalized at Io=2A
0.040
0.030
0.020
0.010
0.000
Vo at Io=10A steady state
-0.010
Steady state voltage levels are superimposed for reference.
-0.020 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0
Output Current (Amps)
5 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA
PROGRAMMABLE DC/DC CONTROLLER FOR ADVANCED MICROPROCESSORS
March 11, 1998
SC1151
OUTLINE DRAWING SO-16
LAND PATTERN SO-16
6 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA

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