2.85V - 18V, 6A, High-Efficiency, Wide-Input, Synchronous, Step-Down Converter with Integrated Telemetry via I2C Interface

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Product Description

The MP8861 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with an I2C control interface. The MP8861 offers a fully integrated solution that achieves 6A of continuous output current with excellent load and line regulation over a wide input supply range.

The output voltage level can be controlled on-the-fly through an I2C serial interface. The reference voltage range can be adjusted from 0.6V to 1.108V in 4mV steps. The voltage slew rate, frequency, current limit, hiccup/latch-off protection, enable, and power-save mode (PSM) are also selectable through the I2C interface.

Constant-on-time (COT) control operation provides fast transient response. An open-drain power good (PG) pin indicates that the output voltage is in the nominal range. Full protection features include over-voltage protection (OVP), over-current protection (OCP), and thermal shutdown.

The MP8861 is available in a QFN-14 (3mmx4mm) package.

Product Features

  • Wide 2.85V to 18V Operating Input Range
  • 6A Continuous Output Current 
  • 1% Internal Reference Accuracy
  • I2C Programmable Reference Range from 0.6V to 1.108V in 4mV Steps with Slew Rate Control
  • 5% Accuracy Output Voltage and Output Current Monitoring via I2C
  • Selectable PFM/PWM Mode, Adjustable Frequency and Current Limit through I2C
  • Four Different Selectable I2C Addresses
  • External Soft Start (SS)
  • Open-Drain Power Good (PG) Indication
  • Output Over-Voltage Protection (OVP)
  • Hiccup/Latch-Off Over-Current Protection (OCP)
  • VOUT Adjustable up to 5.5V using FB pin
  • Available in a QFN-14 (3mmx4mm) Package


  • fsw (max) (kHz)1250
  • Vin (min) (V)2.85
  • Vin (max) (V)18
  • Iout (max) (A)6
  • Isw Limit (typ) (A)8.5
  • Vfb (typ) (V)0.72
  • Iq (typ) (mA)0.42
  • Regulated Outputs1
  • Vout (max) (V)5.5
  • Vout (min) (V)0.6
  • GradeCatalog
  • 封装QFN-14 (3x4)
  • Control ModeCOT
  • Common FeaturesExternal Soft Start, Light-Load Efficiency, Power Good, Synchronous Rectification
  • 特性4 Different I2C Addresses Selectable, 5% Accuracy Output Voltage and Output Current Readback via I2C, I2C Interface, Programmable Output Voltage, Selectable Current Limit, Selectable PFM/PWM Mode