AIC1568CS

AIC1568 4-bit DAC, Simple PWM Power Regulator FEATURE Compatible with HIP6008. Simple Voltage-Mode PWM Control. Fast Transient Response. ±1.5% 4-Bit Digital-to-Analog Output Voltage. Adjustable Current Limit without External Sense Resistors. Full 0% to 100% Duty Ratio. 200KHz Free-Running Oscillator, Programmable up to 350KHz. Power-Good Output Voltage Monitor. Short Circuit Protection with Low Short Circuit Output Current. The internal 4-bit Digital-to-Analog Converter (DAC) adjusts the output voltage from 2.0V to 3.5V in 0.1V increments. The precision reference and voltage-mode control can provide output regulation within ±1.5% over temperature and line voltage shifts. The internal oscillator of the AIC1568 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 a 11MHz bandwidth and 6V/µS slew rate, which enables high converter bandwidth for fast transient response. The AIC1568 provides adjustable over current and short circuit protections. It senses the output current across the on resistance of the N-channel 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. DESCRIPTION The AIC1568 is a high power, high efficiency switching regulator controller optimized for high performance microprocessor applications. It is designed to drive an N-channel MOSFET in a standard buck topology. Featuring a digitally programmable switching regulator, the AIC1568 includes monitoring and protection capabilities in addition to all the essential PWM control functions. APPLICATIONS Power Supply for Pentium, Pentium Pro, Power PC and Alpha Microprocessors. High-Power 5V to 3.xV DC/DC Regulators. Low-Voltage Distributed Power Supplies. Analog Integrations Corporation DS-1568-00 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1568 ORDERING INFORMATION AIC1568 XX PACKAGE TYPE S: SMALL OUTLINE TEMPERATURE RANGE C: 0°C~70°C ORDER NUMBER AIC1568CS (PLASTIC SO) PIN CONFIGURATION TOP VIEW OCSET 1 SS 2 VID0 3 VID1 4 VID2 5 VID3 6 COMP 7 FB 8 16 VSEN 15 RT/OVP 14 VCC 13 BOOT 12 UGATE 11 PHASE 10 PGOOD 9 GND TYPICAL APPLICATION CIRCUIT C9 1000P R2 2.2K C8 0.1µF VSEN OCSET RT/OVP SS VCC VID0 BOOT VID1 UDRI VID2 PHASE VID3 COMP PGOOD GND FB AIC1568 R4 15K R1 10 C2 0.1µF C1 1µF VDRI 12V L1 + VIN 1µH 5V C3 1000 µF x 2 L2 7µH 2.0V≤VOUT≤3.5V at 10A JUMPER C7 33P R6 90.9K C6 1000P RFP45N03L M1 BYV118 D1 + C4 1000 µF x 6 R5 3.01K R7 1.2M R3 47K C5 0.1µF Switching Regulator for Pentium VCORE Supply 2 AIC1568 ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC Boot Voltage, VBOOT ....…...............................................……………............................. 15V ……….......................…...........…………........................................ 15V VCC+0.3V Input, Output, or I/O Voltage ....................………….………......... GND - 0.3V to 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 150°C 300°C Maximum Junction Temperature (Plastic Package) ………………..……................... Maximum Lead Temperature (Soldering 10 Sec) ……………..…………......…......... Note 1: θJA is measured with the component mounted on an evaluation PC board in free air. ESD Classification ....................................…….............……....……….................... Class 2 Maximum Storage Temperature Range ………………………..........…......... -65°C ~150°C TEST CIRCUIT Refer to TYPICAL APPLICATION CIRCUIT. 3 AIC1568 ELECTRICAL CHARACTERISTICS PARAMETER VCC Supply Current Nominal Supply Power-On Reset VCC Threshold Rising VOCSET Threshold Oscillator Free Running Frequency Total Variation Ramp Amplitude DAC Output Voltage DAC Output Voltage Accuracy Error Amplifier DC Gain Gain-Bandwidth Product Slew Rate Gate Driver Upper Gate Source Upper Gate Sink Protection Over-Voltage Trip (VVSEN/VDAC) OCSET Current Source OVP Sourcing Current SS Current SS Sink Current under Current Limit SS Sink Current under Hard Current Limit Power Good Upper Threshold (VVSEN /VDAC) Lower Threshold (VVSEN /VDAC) Hysteresis (VVSEN /VDAC) PGOOD Voltage Low VVSEN rising VVSEN falling Upper and lower threshold IPGOOD=5mA VPGOOD 106 84 2 0.5 114 94 % % % V VVSEN =VDAC, VOCSET=5.0V, VPHASE=0V, VFB=VDAC - 50mV VVSEN=0, VOCSET =5.0V, VPHASE =0V, VFB=0V 65 mA VOCSET =4.5VDC VVSEN =5.5V, VOVP=0V IOCSET IOVP ISS 106 170 30 10 130 115 200 125 230 % µA mA µA µA RUGATE RUGATE 8 5.5 12 10 Ω Ω GBW SR 76 11 6 dB MHz V/µS -1.5 +1.5 % RT Open 6KΩ