PROGRAMMABLE DC/DC CONTROLLER March 11, 1998 SC1150 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION FEATURES 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). APPLICATIONS The SC1150 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 with no external components. Both the range and the increment value may be changed by adding external components. • • • • 85% efficiency 4 bit DAC for output programmability On chip power good and OVP functions ® Meets Intel Pentium Pro VRM8.0 specifications ® Pentium Pro Processor supplies ® Pentium Pro Processor VRM modules 2.0V to 3.5V microprocessor supplies Programmable power supplies ORDERING INFORMATION (1) DEVICE PACKAGE TEMP RANGE (TJ) SC1150CS SO-16 0 - 125°C The SC1150 provides an OVP output which can be used to trigger a crowbar circuit for true over voltage protection. Note: (1) Add suffix ‘TR’ for tape and reel. BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS VCC 1.25V REF CSm SHUTDOWN CSp VCC BST + LEVEL SHIFT AND DRIVE VID2 Maximum Units VCC to GND VIN -0.3 to 7 V ±1 V -0.3 to 15 V DH R D/A 1.00V to 1.75V VID0 Symbol - 70mV VID3 VID1 Parameter CURRENT LIMIT Q OSCILLATOR S PGND PGND to GND BST to GND VOSENSE + + + - - ERROR AMP PWRGOOD + - Operating Temperature Range TA 0 to 70 °C Storage Temperature Range TSTG -65 to +150 °C Lead Temperature (Soldering) 10 sec TLEAD 300 °C VCC + B16997B - OVP GND FB PIN CONFIGURATION GND 1 16 VID0 VCC 2 15 VID1 OVP 3 14 VID2 PWRGOOD 4 13 VID3 CSm 5 12 FB CSp 6 11 VOSENSE PGND 7 10 SHUTDOWN DH 8 9 BST Pentium is a registered trademark of Intel Corporation © 1998 SEMTECH CORP. 1 652 MITCHELL ROAD NEWBURY PARK CA PROGRAMMABLE DC/DC CONTROLLER SC1150 March 11, 1998 ELECTRICAL CHARACTERISTICS o Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; VOSENSE = VO; 0mV < (CSp-CSm) < 60mV; TA = 25 C PARAMETER CONDITIONS (2) Output Voltage IO = 2A in Application circuit 16935E 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) BST - DH = 4.5V, DH - PGND = 2V VID 3210 1111 1110 1101 1100 1011 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx MIN TYP MAX UNITS 1.980 2.079 2.178 2.277 2.376 2.475 2.574 2.673 2.772 2.871 2.970 3.069 3.168 3.267 3.366 3.465 2.000 2.100 2.200 2.300 2.400 2.500 2.600 2.700 2.800 2.900 3.000 3.100 3.200 3.300 3.400 3.500 1 0.5 2.020 2.121 2.222 2.323 2.424 2.525 2.626 2.727 2.828 2.929 3.030 3.131 3.232 3.333 3.434 3.535 60 180 90 70 200 95 1 65 4.2 80 220 V % % V mV kHz % A o ppm/ C 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. 2 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA PROGRAMMABLE DC/DC CONTROLLER SC1150 March 11, 1998 PIN DESCRIPTION Pin # Pin Name Pin Function 1 GND Small Signal Analog and Digital Ground 2 VCC Chip Supply Voltage 3 OVP (1) 4 PWRGOOD 5 CSm High Signal out if VO>setpoint + 20% (1) Open collector logic output, high if VO within 10% of setpoint GND 1 16 VID0 Current Sense Input (negative) VCC 2 15 VID1 OVP 3 14 VID2 6 CSp Current Sense Input (positive) PWRGOOD 4 13 VID3 7 PGND Power Ground CSm 5 12 FB 8 DH High side Driver Output CSp 6 11 VOSENSE 9 BST Vcc for high side Driver PGND 7 10 SHUTDOWN DH 8 9 (1) 10 SHUTDOWN 11 VOSENSE Top end of internal feedback chain 12 FB Voltage Feedback Input 13 VID3 14 VID2 15 VID1 16 Logic low shuts down the converter (1) Programming Input (MSB) (1) Programming Input (1) Programming Input (1) Programming Input (LSB) VID0 BST NOTE: (1) All logic level inputs and outputs are open collector TTL compatible 3 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA PROGRAMMABLE DC/DC CONTROLLER SC1150 March 11, 1998 APPLICATION CIRCUIT L1 4uH Q1 BUK556 5V IN R1 5mOhm C6 1000uF C8 1000uF C10 1000uF + + + + C1 0.1uF C3 1000uF + C2 1000uF + R2 10k D1 PSR16C30CT R5 10 C4 1000uF R3 12V IN 2.32k 3 VID0 16 VID1 15 VID2 14 VID3 13 SHUTDOWN 10 VCC CSp OVP CSm VID0 VOSENSE VID1 PWRGOOD VID2 FB VID3 BST SHUTDOWN 1 + + + C5 1000uF C7 1000uF C9 1000uF C12 0.1uF R4 1.00k C11 0.1uF U1 2 OVP VCCP GND DH PGND 6 5 11 4 12 9 8 7 SC1150CS PWRGD C13 0.1uF REF 16935E MATERIALS LIST Quantity Reference Part/Description Vendor Notes 4 C1,C11-C13 0.1µF Ceramic Various 9 C2-C10 1000µF/6.3V SANYO 1 D1 PSR16C30CT PHOTRON 1 L1 4µH 1 Q1 BUK556 PHILIPS Logic level FET, ≤22mΩ, 30V 1 R1 5mΩ IRC OAR-1 Series 1 R2 10kΩ, 5%, 1/8W Various 1 R3 2.32kΩ, 1%, 1/8W Various 1 R4 1kΩ, 1%, 1/8W Various 1 R5 10Ω, 5%, 1/8W Various 1 U1 SC1150CS SEMTECH MV-GX or equiv. Low ESR 8 Turns 16AWG on MICROMETALS T50-52D core 4 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA PROGRAMMABLE DC/DC CONTROLLER SC1150 March 11, 1998 CHARACTERISTIC CURVES SC1150 Efficiency in Application circuit 16935E Application circuit 16935E Ripple, 3.1V, 10A out 100.0% 95.0% Efficiency 90.0% 3.50V Set 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 16935E Transient Response, 3.1V, 0.3A to 10A SC1150 Regulation in Application circuit 16935E Vo at Io=300mA steady state Vo at Io=10A steady state Steady state voltage levels are superimposed for reference. Voltage change (V) normalized at Io=2A 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) 5 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA PROGRAMMABLE DC/DC CONTROLLER SC1150 March 11, 1998 OUTLINE DRAWING SO-16 LAND PATTERN SO-16 6 © 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA