MP8867 datasheet(17/27 Pages) MPS

Part #	MP8867

Description	High-Efficiency, 8A, 17V, Synchronous Step-Down Converter with I2C Interface

PDF	27 Pages

Scroll/Zoom	100%

Manufacturer	MPS [Monolithic Power Systems]

Direct Link	http://www.monolithicpower.com

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17 / 27 page

MP8867 – SYNCHRONOUS STEP-DOWN CONVERTER

MP8867 Rev.1.01

www.MonolithicPower.com

2/21/2017

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

Once the I2C receives valid output reference

voltage scaling instructions and V_BOOT = “1,”

the output voltage is determined by the resistor

divider R1, R2, and the VREF voltage. The VOUT

value is calculated by Equation (2). The VREF

default value is 0.6V:

)

REF

OUT







(2)

If V_BOOT = “0”, the output voltage is

determined by the I2C control, and the FB loop

is disabled.

The output reference voltage scaling is realized

by adjusting the internal reference voltage

(V_REF), which is the non-inverted input of the

error amplifier. After the MP8867 receives a

valid data byte of the output reference voltage

setting,

searches

the

corresponding

reference voltage from the truth table and

sends the command to adjust VREF with a

controlled

slew

rate.

The

slew

rate

determined by 3 bits of another register, which

can be read and write accordingly.

MP8867 Datasheet(PDF) 17 Page - Monolithic Power Systems