4A, 21V High Efficiency Synchronous Step-Down Converter with I2C Interface

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Product Description

The MP8864 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 4 A continuous output current with excellent load and line regulation over a wide input supply range. The MP8864 has synchronous-mode operation for higher efficiency over the output load range. The reference voltage level is controlled, on-the-fly through a 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 MP8864 requires a minimal number of readily available, standard external components and is available in a 15-pin QFN15 (3mm x 3mm) package.

Product Features

  • Wide 4.5 V to 21 V Operation Input Range
  • 50 mO/23 mO Low RDS(ON) Internal Power MOSFETs
  • 1% VOUT Accuracy
  • I2C Programmable Reference Voltage Range from 0.6 V to 1.87 V in 10 mV Steps with Slew-Rate Control
  • I2C Selectable Switching Frequency. Default 600 kHz Switching Frequency
  • Programmable Output Voltage
  • Power-Saving Mode, OTP, and OCP via I2C
  • Power Good Indication
  • 1-Bit I2C Address Set Pin
  • OCP in Hiccup Mode
  • External Soft-Start
  • Available in a QFN 3mm x 3mm Package


  • fsw (max) (kHz)1600
  • Vin (min) (V)4.5
  • Vin (max) (V)21
  • Iout (max) (A)4
  • Isw Limit (typ) (A)7.5
  • Max Duty Cycle (%)0.95
  • Vfb (typ) (V)0.6
  • Iq (typ) (mA)0.5
  • Regulated Outputs1
  • Vout (max) (V)5.2
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageQFN-15 (3x3)
  • Control ModeCurrent Mode
  • Common FeaturesExternal Soft Start, Light-Load Efficiency, Power Good, Synchronous Rectification
  • Special FeaturesI2C Interface, Programmable Frequency, Programmable Output Voltage, Selectable Power-Saving Mode

Evaluation Kit


Kit details

The EV8864-Q-00A is used for demonstrating the performance of MPS’s MP8864. MP8864 is a highly integrated and high frequency synchronous step-down switcher with I2C control interface. It is optimized to support up to 4A load current over an input supply range from 4.5V to 21V with excellent load and line regulation.

Current-Mode operation provides fast transient response and eases loop stabilization. The output voltage level can be controlled, on-the fly through a 3.4Mbps I2C serial interface. Voltage range can be adjusted from 0.6V to 1.87V in 10mV steps. Voltage slew rate, switching frequency and power savings mode are also selectable through the I2C interface. Fully protection features includes over current protection, over voltage protection and over temperature protection.

MP8864 is available in QFN15 (3mmx3mm) package.

$25.00 + tax

Evaluation Kit


Kit details

This GUI can be used for evaluating the output voltage options supported by the MP5416 and for optimizing output voltage selection.  It does not require evaluation board. Refer to app note AN139 for more details. 

System Requirements:

Windows 7 or later

.Net Framework 4 or later

$0.00 + tax