AIC1569A 5-bit DAC, Synchronous PWM Power Regulator FEATURES Compatible with HIP6004. The AIC1569A is a high power, high efficiency Simple Voltage-Mode PWM Control. switching regulator controller optimized for high Dual N-Channel MOSFET Synchronous Drive. performance microprocessor applications. It is Fast Transient Response. ±1% 5-Bit Digital-to-Analog Output Voltage. designed to drive dual N-channel MOSFETs in a Adjustable Current Limit Without External Sense Resistor. Full 0% to 100% Duty Ratio. 200KHz Free-Running Oscillator, Power-Good Output Voltage Monitor. a digitally programmable switching regulator, the capabilities in addition to all the essential synchronous PWM control functions. The internal 5-bit Digital-to-Analog Converter APPLICATIONS standard synchronous buck topology. Featuring AIC1569A includes monitoring and protection Programmable up to 350KHz. DESCRIPTION (DAC) adjusts the output voltage from 2.0V to Power Supply for Pentium® II, Power® and Alpha® Microprocessors. High-Power 5V to 3.xV DC/DC Regulators. Low-Voltage Distributed Power Supplies. 3.5V in 0.1V increments and 1.3V to 2.0V in 0.05V increments. The precision reference and voltage-mode control can provide output regulation within ±1% over temperature and line voltage shifts. The internal oscillator of the AIC1569A free-runs at 200KHz and can be adjusted up to 350KHz. The resulting PWM duty ratio ranges from 0% to 100%. The error amplifier features an 11MHz bandwidth and 6V/µS slew rate, which enables high converter bandwidth for fast transient response. The AIC1569A provides adjustable over current and short circuit protections. It senses the output current across the on resistance of the upper Nchannel MOSFET without an external low value sense resistor. It also monitors the output voltage with a window comparator and issues a power good signal when the output is within 10% of the rated output voltage. Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC DS-1569A-00 TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1569A ORDERING INFORMATION AIC1569A XX PIN CONFIGURATION ORDER NUMBER PACKAGE TYPE S: SMALL OUTLINE AIC1569ACS (PLASTIC SO) TOP VIEW VSEN 1 OCSET 2 TEMPERATURE RANGE C: 0°C~70°C 20 RT 19 OVP 18 VCC SS 3 VID0 4 17 LGATE VID1 5 16 PGND VID2 6 15 BOOT VID3 7 14 UGATE VID4 8 13 PHASE COMP 9 12 PGOOD FB 10 TYPICAL APPLICATION CIRCUIT C9 1000pF R2 R1 C8 47Ω VSEN 0.1µF RT OCSET OVP SS VCC VID0 VID0 LGATE VID1 VID1 VID2 VID2 VID3 VID3 PGND BOOT UGATE VID4 VID4 COMP 90.9K 0.1µF 1µF 12V L1 M1 + 5V 1µH C3 1000µF x 3 L2 VOUT 3µH D1 PGOOD GND M2 AIC1569A NDP603AL R4 15K 33pF R6 C1 PHASE FB C7 C2 RFP45N03L 2.2K 1N5820 11 GND + C4 1000µF x 8 C6 R3 1000pF R5 R7 1.2M 47K C5 3.01K 0.1µF DC/DC Converter for Pentium II VCORE 2 AIC1569A ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC ....…...........................….……....………….......................................... 15V Boot Voltage, VBOOT ………........................………..…………............................................. 15V Input, Output, or I/O Voltage .....................…………...…...……....... GND - 0.3V to VCC+0.3V ESD Classification ..............................……………….…................……......................... Class 2 Recommended Operating Conditions Supply Voltage, VCC ....…............................…………..……...................................... 12V±10% Ambient Temperature Range .…............................…....…………….….................. 0°C ~ 70°C Junction Temperature Range ....…...........……………..........…............................. 0°C ~100°C Thermal Information Thermal Resistance, θJA (Typical, Note 1) SOIC Package...............................………….……..…………………….........…. 100°C /W SOIC Package (with 3 in2 of Copper) ……………..………………………......….. 90°C /W Maximum Junction Temperature (Plastic Package) …..……………….....…….............. 150°C Maximum Storage Temperature Range …………………………...........…......... -65°C ~150°C Maximum Lead Temperature (Soldering 10 sec) ……….…………………......…......... Note 1: θJA 300°C is measured with the component mounted on an evaluation PC board in free air. TEST CIRCUIT Refer to TYPICAL APPLICATION CIRCUIT. ELECTRICAL CHARACTERISTICS (VCC= 12V, Ta=25°°C, unless otherwise specified.) PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT VCC Supply Current Nominal Supply UGATE Open IVCC 1 3 mA 9.3 10.2 V Power-On Reset VCC Threshold VOCSET=4.5V 8.2 Rising VOCSET Threshold 1.26 V Oscillator Free Running Frequency RT Open 170 Total Variation 6KΩ<RT <200KΩ -20 Ramp Amplitude RT Open ∆VOSC 200 1.5 230 KHz +20 % VP-P 3 AIC1569A ELECTRICAL CHARACTERISTICS (Continued) PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT DAC Output Voltage DAC Output Voltage Accuracy VDAC=1.3V~3.5V -1.0 +1.0 % Error Amplifier DC Gain 76 dB GBW 11 MHz SR 6 V/µS Upper Gate Source RUGATE 5.8 12 Ω Upper Gate Sink RUGATE 4.4 10 Ω Lower Gate Source RLGATE 4.7 12 Ω Lower Gate Sink RLGATE 3.0 10 Ω 106 115 125 % IOCSET 170 200 230 µA IOVP 30 Gain-Bandwidth Product Slew Rate Gate Driver Protection Over-Voltage Trip (VVSEN/VDAC) OCSET Current Source VOCSET=4.5VDC OVP Sourcing Current VVSEN=5.5V, VOVP=0V SS Current ISS mA 10 µA SS Voltage under Current Limit VVSEN=VDAC, VOCSET=5.0V, VPHASE=0V, VFB=VDAC - 50mV 2.0 V SS Voltage under Hard Current Limit VVSEN=0, VOCSET=5.0V, VPHASE=0V, VFB=0V 0.7 V Power Good Upper Threshold (VVSEN/VDAC ) VVSEN Rising 106 114 % Lower Threshold (VVSEN /VDAC ) VVSEN Falling 84 94 % Hysteresis Upper and Lower threshold (VVSEN /VDAC ) PGOOD Voltage Low IPGOOD=5mA VPGOOD 2 % 0.5 V 4 AIC1569A BLOCK DIAGRAM 115% + − 110% POWER-ON RESET VCC OVP OVP + − VSEN PGOOD POWER GOOD 90% + − + − 50% OVER CURRENT + − 10µA OCSET IOCS 200µA SS PHASE BOOT 4V UGATE SOFT START VDAC VID0 VID1 VID2 VID3 VID4 VCC 5-BITS DAC + − ERROR AMP FB COMP GND CONTROL LOGIC REFERENCE + − LGATE PWM COMPARATOR PGND RT OSCILLATOR PIN DESCRIPTIONS equation: PIN 1: VSEN - Converter output voltage sense pin. Connect this pin to the converter output. The PGOOD and OVP comparator circuits use this signal to report output voltage status and perform overvoltage protection function. PIN 2:OCSET - Current limit sense pin. Connect a resistor ROCSET from this pin to the drain of the external MOSFET. ROCSET, an internal 200µA current source (IOCS), and the external MOSFET on-resistance (RDS(ON)) jointly set the over current trip point according to the following IPEAK = IOCS × ROCSET RDS( ON) If FB pin voltage is sensed to be below 50% of the internal voltage reference VDAC, the over current comparator cycles the soft-start function. PIN 3:SS - Soft start pin. Connect a capacitor from this pin to ground. An internal 10µA current source provides soft start function for the converter. 5 AIC1569A PIN 4: VID0 PIN 5: VID1 PIN 6: VID2 PIN 7: VID3 PIN 8: VID4 - 5-bit DAC voltage select pin. TTL inputs used to set the internal voltage reference VDAC. When left open, these pins are internally pulled up to 5V and provide logic ones. The level of VDAC sets the converter output voltage as well as the PGOOD and OVP thresholds. Table 1 specifies the VDAC voltage for the 32 combinations of DAC inputs. PIN 9:COMP - External compensation pin. This pin is connected to error amplifier output and PWM comparator. An RC network is connected to FB pin to compensate the voltage-control feedback loop of the converter. 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2.2V 2.1V 2.0V 2.05V 2.00V 1.95V 1.90V 1.85V 1.80V 1.75V 1.70V 1.65V 1.60V 1.55V 1.50V 1.45V 1.40V 1.35V 1.30V PIN 10:FB - The error amplifier inverting input pin. The FB pin and COMP pin are used to compensate the voltage-control feedback loop. PIN 13:PHASE - Over current detection pin. Connect the PHASE pin to source of the external MOSFET. This pin detects the voltage drop across the MOSFET RDS(ON) for over-current protection. PIN 11:GND - Signal GND. It also serves as the power GND for the upper gate driver. PIN 14: UGATE- External MOSFET gate drive pin. Connect UGATE to gate of the external MOSFET. PIN 12:PGOOD- Power good indicator pin. PGOOD is an open drain output. This pin is pulled low when the converter output is ±10% out of the VDAC reference voltage. PIN 15: BOOT - External MOSFET driver power supply pin. To convert 5V main power to VCORE power by driving N-channel MOSFET, supply voltage of no higher than 12V is recommended since the negative power terminal of the internal driver is internally tied to GND. Table 1. Output Voltage Program VID4 VID3 VID2 VID1 VID0 VDAC 1 0 0 0 0 3.5V 1 0 0 0 1 3.4V 1 0 0 1 0 3.3V 1 0 0 1 1 3.2V 1 0 1 0 0 3.1V 1 0 1 0 1 3.0V 1 0 1 1 0 2.9V 1 0 1 1 1 2.8V 1 1 0 0 0 2.7V 1 1 0 0 1 2.6V 1 1 0 1 0 2.5V 1 1 0 1 1 2.4V 1 1 1 0 0 2.3V PIN 16:PGND - Driver power GND pin. PGND should be connected to a low impedance ground plane close to lower NMOSFET source. PIN 17:LGATE - Lower N-MOSFET gate driver pin. PIN 18: VCC - The chip power supply pin. It also serves as power supply for LGATE driver. Recommended supply voltage is 12V. PIN 19:OVP -Over voltage indicator pin. This pin also provides a driver source current to turn on an external SCR in the event of an over voltage condition. 6 AIC1569A PIN 20: RT - Frequency adjustment pin. Connecting a resistor (RT) from this pin to GND, increase the frequency by the following equation. FS ≅ 200KHz + PHYSICAL DIMENSIONS 20 LEAD PLASTIC SO (300 mil) (unit: mm) D H E e B A A1 5 × 10 5 log RT C L SYMBOL A A1 B C D E e H L MIN 2.35 0.10 0.33 0.23 12.60 7.40 MAX 2.65 0.30 0.51 0.32 13.00 7.60 1.27(TYP) 10.00 0.40 10.65 1.27 7