MP8861

2.85V - 18V, 6A, High-Efficiency, Wide-Input,

Synchronous, Step-Down Converter with

Integrated Telemetry via I2C Interface

MP8861 Rev. 1.1

www.MonolithicPower.com

1

5/28/2020

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2020 MPS. All Rights Reserved.

The Future of Analog IC Technology

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.

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

APPLICATIONS



Solid-State Drives (SSD)



Flat-Panel Televisions and Monitors



Digital Set-Top Boxes



Distributed Power Systems



Networking/Servers

All MPS parts are lead-free, halogen-free, and adhere to the RoHS

directive. For MPS green status, please visit the MPS website under Quality

Assurance. “MPS” and “The Future of Analog IC Technology” are registered

trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

0.01

0.1

1

VIN=4.5V

VIN=12V

60

64

68

72

76

80

84

88

92

96

100

VIN=18V

8