MP8861 datasheet(22/37 Pages) MPS

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MP8861 – 2.85V - 18V, 6A, SYNCHRONOUS, STEP-DOWN CONVERTER

MP8861 Rev. 1.1

www.MonolithicPower.com

5/28/2020

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

REGISER DESCRIPTION

The MP8861 contains six write or read registers.

hiccup OCP, etc. Register 02 is the second

system control register and can be used to set

the switching frequency, current limit, etc.

and

output

voltage

indicating

registers,

respectively. Register 05 is the IC ID register.

and can be used to check if the IC is in OCP,

OTP, etc. The register map is shown below.

ADD

NAME

R/W

VSEL

r/w

Reserved

Output Reference

SysCntlreg1

r/w

GO_BIT

Slew Rate

Retry

OVP

Hiccup

OCP

Mode

SysCntlreg2

r/w

PG Deglitch Time

Switching

Frequency

Soft

Stop

Current Limit Adjust

Output

Current

Output Current

Output

Voltage

Output Voltage

ID1

Vendor ID

Die ID

Status

Reserved

OTEW

1) Reg00 VSEL

selection register. The MP8861 default output

voltage is determined by the FB resistor divider

after the MP8861 power start-up or EN start-up.

The reference voltage is adjustable from 0.6V

1.108V.

Before

adjusting

the

output

reference voltage, the bit GO_BIT of the first

system control register 01 should be set to 1,

and then the reference voltage can be adjusted

by the lower seven bits of register 00. When the

output reference voltage setting command is

finished, GO_BIT auto-resets to 0 to prevent

false operation of the VOUT scaling. GO_BIT

should be set to 1 before adjusting the output

reference voltage via the I2C.

Table 3 shows the output reference voltage

selection chart from 0.6V to 1.108V via the I2C.

NAME

BITS

DEFAULT

DESCRIPTION

Reserved

D[7]

Reserved for further use.

Output

Reference

D[6:0]

001 1110

Sets the output voltage from 0.6V to 1.108V (see Table 3). The default

value is 0.72V.

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