APW7004 Datasheet | Anpec Electronics Coropration

Synchronous-Rectifier PWM Controller for Pentium TM II Microprocessor Features - - - Simple Single-Loop Control Design-Voltage Mode 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 Alpha TM 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 Power PC TM is a trademark of IBM General Description The APW7004 provides a plete 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 200k Hz 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 simple, single feedback loop, voltage-mode control topology with high transient performance. The APW7004 also Features with multiple protections against over-current and over-voltage conditions by inhibiting PWM operation. The APW7004 uses the RDS(ON) of the upper MOSFET as the current sensing element which eliminates the demend for an extra ponent. The APW7004 also monitors the output voltage using a parator with hysteresis that tracks the DAC output and issues a Power Good signal once...