DESCRIPTION SC1153 low-cost, full featured, synchronous voltage-m
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SC1153
DESCRIPTION
SC1153 low-cost, full featured, synchronous voltage-mode controller designed single ended power supply applications where efficiency primary concern. Synchronous operation allows elimination heat sinks many applications. SC1153 ideal implementing DC/DC converters needed power advanced microprocessors, such Pentium® lll, both single multiple processor configurations. Internal level-shift, high-side drive circuitry, preset shoot-thru control, allows inexpensive n-channel power switches. SC1153 features include integrated 5-bit DAC, temperature compensated voltage reference, triangle wave oscillator, current limit comparator, frequency shift over-current protection, accessible, internally compensated error amplifier. Power good signaling, logic compatible shutdown, over voltage protection also provided. SC1153 operates fixed 200KHz, providing optimum compromise between efficiency, external component size, cost.
FEATURES cost full featured Synchronous operation programmable output On-chip power good functions Designed meet Intel (Pentium® IlI) 1.3V 3.5V Range, tolerance APPLICATIONS Pentium® Core Supply Multiple Microprocessor Supplies Voltage Regulator Modules (VRM) Programmable Power Supplies High Efficiency DC/DC Conversion ORDERING INFORMATION
DEVICE
PACKAGE SO-20
TEMP. RANGE (TJ) 125°C
SC1153CSW.TR
Note: Only available tape reel packaging. reel contains 1000 devices.
CONFIGURATION
BLOCK DIAGRAM
View
1.25V
SHUTDOWN BSTH CURRENT LIMIT UPPER LEVEL SHIFT DRIVE
70mV VID4 VID3 VID2 VID1 VID0 200kHz OSCILLATOR
PGNDH
VOSENSE OPEN COLLECTORS PWRGOOD ERROR SYNCHRONOUS DRIVE BSTL SHOOT-THRU CONTROL
(20-Pin SOIC)
PGNDL
Pentium registered trademark Intel Corporation
2000 SEMTECH CORP.
MITCHELL ROAD NEWBURY PARK 91320
SC1153
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol PGND Thermal Resistance Junction Case Thermal Resistance Junction Ambient Operating Temperature Range Storage TSTG Temperature Range Lead Temperature TLEAD (Soldering) Maximum -0.3 -0.3 +150 Units °C/W °C/W
ELECTRICAL CHARACTERISTICS
Unless specified: 4.75V 5.25V; PGND (CS(+) CS(-)) 60mV; 25oC PARAMETER Output Voltage Supply Voltage Supply Current Load Regulation Line Regulation Gain (AOL) Current Limit Voltage Oscillator Frequency Oscillator Duty Cycle Sink/Source Current Sink/Source Current Threshold Voltage Source Current Power Good Threshold Voltage Dead Time NOTE: Specification refers application circuit (Figure 1.). This part sensitive. standard handling precautions required. VOVP BSTH 4.5V, PGNDH BSTL 4.5V, PGNDL 0.3A 15A(1) codes VOSENSE
CONDITIONS
UNITS
Output Voltage Table.
2000 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
SC1153
DESCRIPTION
NOTE: logic level inputs outputs open collector compatible. Name PWRGOOD CS(-) CS(+) PGNDH PGNDL BSTL BSTH SHUTDOWN VOSENSE VID4 VID3
Function Small Signal Analog Digital Ground Chip Supply Voltage High Signal Setpoint Open collector logic output, high within setpoint Current Sense Input (negative) Current Sense Input (positive) Power Ground High Side Switch High Side Driver Output Connected Power Ground Side Switch Side Driver Output Side Driver (Boost) High Side Driver (Boost) Logic shuts down converter internal feedback chain Programming Input (MSB) Programming Input Programming Input Programming Input Programming Input (LSB)
VID2(1) VID1 VID0
CONFIGURATION
2000 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
SC1153
APPLICATION CIRCUIT
1000uF 0.1uF 1000uF 1000uF 1N5817 5mOhm 1000uF 1000uF 1000uF
VCCP
1000uF
1000uF
1000uF
0.1uF
VID0 VID1 VID2 VID3 VID4 0.1uF VID0 VID1 VID2 VID3 SHUTDOWN PGNDL SC1153CS CSVOSENSE PWRGOOD VID4 BSTH PGNDH BSTL 0.1uF 1.00k 2.32k
SHUTDOWN PWRGOOD
Pentium Power Supply Figure
MATERIALS LIST
Quantity Reference Part/Description Vendor Various SANYO Various Turns 16AWG MICROMETALS T50-52D core notes Various Various Various Various SEMTECH selection requires trade-off between efficiency cost. Absolute maximum RDS(ON) OAR-1 Series MV-GX equiv. Notes C1,C11-C13 0.1µF Ceramic C2-C10 1000µF/6.3V 1N5817 notes 10k, 1/8W 2.32k, 1/8W 1/8W 1/8W SC1153CS
2000 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
SC1153
OUTPUT VOLTAGE TABLE
Unless specified: 5.00V; PGND (CS(+) CS(-)) 60mV; 25°C PARAMETER Output Voltage CONDITIONS Application Circuit (Figure 43210 01111 01110 01101 01100 01011 01010 01001 01000 00111 00110 00101 00100 00011 00010 00001 00000 11111 11110 11101 11100 11011 11010 11001 11000 10111 10110 10101 10100 10011 10010 10001 10000 1.287 1.336 1.386 1.435 1.485 1.534 1.584 1.633 1.683 1.732 1.782 1.832 1.881 1.931 1.980 2.030 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 1.300 1.350 1.400 1.450 1.500 1.550 1.600 1.650 1.700 1.750 1.800 1.850 1.900 1.950 2.000 2.050 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 1.313 1.364 1.414 1.465 1.515 1.566 1.616 1.667 1.717 1.768 1.818 1.868 1.919 1.969 2.020 2.070 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 UNITS
2000 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
SC1153
CHARACTERISTIC CURVES
SC1153 Efficiency Application Circuit (Figure
100%
Efficiency Vo=3.5V 3.0V 2.5V 1.8V 2.0V
Output Current (Amps)
SC1153 Regulation Application Circuit (Figure
Vout (mV)
Output Current (Amps)
2000 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
SC1153
OUTLINE DRAWING SO-20
Ref. MS-013AC
THEORY OPERATION
voltage VOSENSE applied, through internal precision resistor feedback chain, inverting input error amplifier. non-inverting input error amplifier supplied with voltage derived from internal trimmed bandgap voltage reference. output error amplifier compared triangular output internal oscillator generate fixed frequency, variable duty cycle pulse train. internal oscillator uses on-chip capacitor precision trimmed current sources frequency 200kHz. generated pulse train gated with output current limit latch inhibit signal produce drive signal upper FET. also inverted produce drive signal lower FET. These drive signals modified "shoot-through control" circuitry that turn-on delayed until bottom turned off, visa-versa. current limit latch (ending upper drive pulse early) current limit comparator indicates overcurrent condition. latch reset start each oscillator period. PWRGOOD signals derived from voltage VOSENSE comparators from internal feedback chain.
ECN00-1346 2000 SEMTECH CORP. MITCHELL ROAD NEWBURY PARK 91320
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