APW7004

APW7004 Synchronous-Rectifier PWM Controller for PentiumTM II Microprocessor Features Simple Single-Loop Control Design-VoltageMode PWM Control Fast Transient Response High-Bandwidth Error Amplifier 5-Bit Digital-to-Analog Output Voltage Selection Wide Range from1.3VDC to 3.5VDC 0.1V Binary Steps from 2.1VDC to 3.5VDC .05V Binary Steps from 1.3VDC to 2.05 VDC 6´ 86TM is a trademark of Cyrix Corporation AlphaTM is a trademark of Digital Equipment Corporation K6 TM is a trademark of Advanced Micro Devices, Inc. Pentium TM is a trademark of Intel Corporation PowerPC TM is a trademark of IBM General Description The APW7004 provides a complete control and multiple protection for a DC-DC converter optimized for high performance microprocessor applications. It is designed to drive two N-Channel MOSFETs in a synchronous-rectified buck topology. The APW7004 integrates output voltage control, output voltage programming, monitoring and protection functions into a single chip IC. The APW7004 includes a 5-bit digital-to-analog converter (DAC) that provides a easily adjustable and precisely output voltage from 2.1VDC to 3.5VDC in 0. 1 increments and from 1.3 VDC to 2.05 VDC in 0. 05V increments. Any selected output voltage can be maintained within ±1% accuracy over temperature and line voltage variations. With a 200kHz free-running triangle-wave oscillator and a error amplifier featuring a 15MHz unity-gain bandwidth and 6V/us slew rate inside the chip, APW7004 can implement a...