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High Input Voltage 3.36V / 8A Synchronous Buck Converter with 100mA LDO

  • Wide Operating Range from +5.5V to +24V Input Voltages
  • Power-On-Reset Monitoring on VIN at 4.5V ~ 4.9V range
  • Built-in 100uA low quiescent current
  • Support IOUT=8A Application
  • Built in PWM & PFM Control Schemes with COT achitecture
  • Built in Integrated Bootstrap Forward P-CH MOSFET
  • Fixed Switching Frequency from 700KHz
  • Fixed 3.36V VOUT REF voltage with ±0.6% accuracy
  • Support Ultrasonic Mode selection on EN Pin
  • Support built-in fixed Soft Start time 2.4ms
  • Integrated 25mΩ N-Channel MOSFET For High Side MOS
  • Integrated 12mΩ N-Channel MOSFET For Low Side MOS
  • Built in Open-Drain Type POK function and EN control
  • Built in 3.36V / 100mA LDO and Switch-over MOSFET with PWM output
  • UVP setting at 70%of VREF & OVP setting at 125% of VREF & Thermal Shutdown
  • Built in Over Current Protection and Current Limit Protection using high-side MOSFET RDS(on) and low-side MOSFET RDS(on) sensing
  • Flip-Chip TQFN 2x3-12P with Lead Free & RoHS compliant

General Description
The APW8879A is a 8A, synchronous buck converter with integrated 25mΩ High-Side MOSFET and 12mΩ LowSide MOSFET. The APW8879A designed with a constant on-time control architecture can step down high voltage to accommodate low-voltage chipset for IMPV8 applications. The APW8879A is equipped with an automatic PFM/PWM mode operation. At light load, the converter operates in the PFM mode to reduce the switching losses and provide high efficiency. At heavy load, the converter works in PWM mode and operates nearly at constant frequency for lownoise requirements. The APW8879A is also equipped with Power-on-reset, soft-start, soft-stop, and whole protections (under-voltage, over-voltage, over-temperature, over-current and current-limit) into a single package. The charge pump circuit with 250kHz clock driver uses VOUT as its power supply to generate approximately 10~12V DC voltage. This device, available in TQFN 2x3-12 package, provides a very compact system solution to minimize external components and PCB area.

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