AIC1573 5-bit DAC, Synchronous PWM Power Regulator with Simple PWM Power Regulator, LDO And Linear Controller n FEATURES l l n DESCRIPTION The AIC1573 combines two PWM voltage mode controllers and two linear controllers as well as the monitoring and protection functions in this chip. One PWM controller regulates the microprocessor core voltage with a synchronous rectified buck converter. The second PWM controller provides AGP bus 1.5V or 3.3V power with a standard buck converter. Two linear controllers regulate power for the 1.5V GTL bus and 1.8V power for the chip set core voltage and/or cache memory circuits. An integrated 5 bit D/A converter that adjusts the microprocessor core voltage from 2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V in 0.05V increments. The second PWM controller for AGP bus power is selectable by means of SELECT pin status for 1.5V or 3.3V with 3% accuracy. Two linear controllers drive with external N-channel MOSFETs to provide 1.5V3% and fixed output voltage 1.8V3%. This chip monitors all the output voltages. Power Good signal is issued when the core voltage is within 10% of the DAC setting and the other levels are above their under-voltage levels. Over-voltage protection for the core output uses the lower Nchannel MOSFET to prevent output voltage above 116% of the DAC setting. The PWM over-current function monitors the output current by using the voltage drop across the upper MOSFET's RDS(ON), eliminating the need for a current sensing resistor. Compatible with HIP6020. Provides 4 Regulated Voltages for Microprocessor Core, AGP Bus, Memory and GTL Bus Power. TTL Compatible 5-bit Digital-to-Analog Core Output Voltage Selection. Range from 1.3V to 3.5V. 0.1V Steps from 2.1V to 3.5V. 0.05V Steps from 1.3V to 2.05V. l l l l 1.0% PWM Output Voltage for VCORE. 3% PWM Output Voltage for AGP Bus. 3.0% Reference Voltage for Chipset and/or C ache Memory and VGTL. Simple Voltage-Mode PWM Control with Built in Internal Compensation Networks. N-Channel MOSFET Driver for PWM buck converters. Linear Controller Drives Compatible with both N - Chanel MOSFET and NPN Bipolar Series Pass Transistor. l l l l l l l Operates from +3.3V, +5V and +12V Inputs. Fast Transient Response. Full 0% to 100% Duty Ratios. Adjustable Current Limit without External Sense Resistor. Microprocessor Core Voltage Protection against Upper MOSFET shorted to +5V. Power Good Output Voltage Monitor. Over-Voltage and Over-Current Fault Monitors. 200KHz Free-Running Oscillator Programmable up to 700KHz. l l l l n APPLICATIONS l Full Motherboard Power Regulation for Computers. Analog Integrations Corporation www.analog.com.tw DS-1573-01 Sep 10, 01 TEL: 886-3-5772500 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC FAX: 886-3-5772510 1 AIC1573 n APPLICATION CIRCUIT +12V IN + 4.7F C7 VCC 28 C5 1nF L3 +5V IN 1nF 9 23 OCSET2 OCSET1 UGATE1 PHASE1 R3 Q1 + CIN 10V 680F*7 1 H GND V OUT2 3.3V or 1.5V + COUT2 1000F*3 Q3 L2 7H UGATE2 PHASE2 1 2 27 26 V OUT1 Q2 R1 10K L1 3H + COUT1 1000F*7 25 LGATE1 VSEN2 24 10 PGND 21 FB1 C6 0.22F SELECT 11 20 NC R2 680K +3.3V IN VAUX 16 22 VSEN1 Q4 V OUT3 1.5V COUT3 + DRIVE3 18 7 19 6 5 4 3 VID0 VID1 VID2 VID3 VID4 VSEN3 Q5 VOUT4 1.8V + COUT4 DRIVE4 15 8 13 PGOOD FAULT/RT SS VESN4 14 17 GND 12 Css 2 AIC1573 n ORDERING INFORMATION AIC1573-CX PACKAGING TYPE S: SMALL OUTLINE ORDER NUMBER AIC157 3CS (SO28) PIN CONFIGURATION UGATE2 1 28 V C C 27 UGATE1 26 PHASE1 25 LGATE1 24 PGND 23 OCSET1 22 VSEN1 21 FB1 20 NC 19 VSEN3 18 DRIVE3 17 GND 16 VAUX 15 DRIVE4 PHASE2 2 VID 4 3 VID 3 4 VID 2 5 VID 1 6 VID0 7 PGOOD 8 OCSET2 9 VSEN2 10 SELECT 11 S S 12 FAULT/RT 13 VSEN4 14 n ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC .................. ... ... ... ... ........ ... ... ... ............ ..... ... ..................... +15V PGOOD, FAULT and GATE Voltage ........ ... ... ........ ... ... ..... .... GND -0.3V to VCC +0.3V Input, Output , or I/O Voltage ......... ...... ... ... ... ... ... ... ... ... ..... ... ............ GND -0.3V to 7V Recommended Operating Conditions Supply Voltage; VCC... ... ..... ... ... ... .............. ................... +12V10% Ambient Temperature Range ... ... ..... ... ..... ... ... ................. 0C~70C Junction Temperature Range ... ... ....... .... ... ... .................. 0C~125C Thermal Information Thermal Resistance, JA SOIC package ... ... ... ... ... ... ... ... ... ... ... ... ... ..... ..... .............. 70C/W SOIC package (with 3in2 of copper) ... ...... ..... ... .......... ......... 50C/W Maximum Junction Temperature (Plastic Package) Maximum Storage Temperature Range Maximum Lead Temperature (Soldering 10 sec) ... ... ... ... ... ... ... ..... ... ...... 150C ... ... ... ... ... ... ... ... ... ... ..... ... 300C ... ... ... ... ... ... ... ... ..... ... ... .... -65C ~ 150C 3 AIC1573 n ELECTRICAL CHARACTERISTICS PARAMETER VCC SUPPLY CURRENT Supply Current POWER ON RESET Rising VCC Threshold Falling VCC Threshold Rising VAUX Threshold VAUX Threshold Hysteresis Rising VOCSET1 Threshold OSCILLATOR Free Running Frequency Total Variation Ramp. Amplitude RT=Open 6k |