MP8865 Synchronous Step-Down Converter

By Monolithic Power Systems 102

MP8865 Synchronous Step-Down Converter

MPS' MP8865 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with an I2C control interface. It offers a very compact solution to achieve a 6 A continuous output current with excellent load and line regulation over a wide input supply range. The MP8865 has synchronous-mode operation for higher efficiency over the output load range.

The reference voltage level can be controlled on-the-fly through the 3.4 Mbps I2C serial interface. The voltage range can be adjusted from 0.6 V to 1.87 V in 10 mV steps. Also, the voltage slew rate, switching frequency, enable, and power-saving mode are selectable through the I2C interface.

Current-mode operation provides fast transient response and eases loop stabilization. Full protection features include over-current protection (OCP), over-voltage protection (OVP), and thermal shutdown (TSD).

The MP8865 requires a minimal number of readily available, standard, external components, and is available in a QFN-15 3 mm x 3 mm package.

Features
  • Wide 4.5 V to 21 V operation input range
  • 45 mΩ / 18 mΩ low RDS(ON) internal power MOSFETs
  • 1% VOUT accuracy
  • Programmable output voltage
  • I2C selectable switching frequency
  • Default 600 kHz switching frequency.
  • I2C programmable reference voltage range from 0.6 V to 1.87 V in 10 mV steps with slew rate control
  • Power saving
  • Power good indication
  • 1-bit I2C address set 
  • OCP protection in hiccup mode
  • External soft start
  • Available in a QFN-15 3 mm x 3 mm package
 Applications
  • SoC and media processors
  • General consumers
   
  • Distributed power systems

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