DESCRIPTION
The FUJITSU MB3871 is a pulse width modulation (PWM) DC/DC converter IC chip that provides a selection of 1.3 V to 2.0 V output voltages for Mobile Pentium® II* CPU’s, using a 4-bit input signal information.
The MB3871 utilizes synchronous rectification for high efficiency and features a soft-start/discharge control function for ease in designing power supplies in multi-supply systems, making it ideal for Mobile Pentium® II power supply systems.
   
FEATURES
• Highly efficient for using synchronous rectification scheme
• On-chip soft-start/discharge control circuit
• High precision output voltage: ±1.2%
• 4-bit, 16-step DAC: 2.0 V to 1.3 V in 50 mV steps
• Frequency range: 100 kHz to 500 kHz using variable resistance
    (on-chip frequency setting capacitance)
• Standby current: 0 µA TYP
• On-chip PWRGOOD circuit for output voltage state detection
• Timer-latch short-circuit protection circuit,
    and overvoltage protection circuit for output protection