MP8869WGL datasheet(26/41 Pages) MPS

26 / 41 page

MP8869W

– 3V - 18V, 12A, SYNCHRONOUS STEP-DOWN CONVERTER

MP8869W Rev. 1.02

www.MonolithicPower.com

1/18/2018

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

REGISER DESCRIPTION

The MP8869W contains six write or read registers.

users can use it to set the slew rate, hiccup OCP,

etc. Register 02 is the second system control

frequency, current limit, etc.

output voltage indicating registers. Register 05 is

the IC ID register. Register 06 is the IC status

indication register, and users can use it to check if

the

over-current

protection,

over-

temperature protection status, etc. The register

map is shown below.

ADD

NAME

R/W

VSEL

R/W

V_BOOT

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

The

MP8869W

default

output

voltage

determined by the FB resistor divider after the

MP8869W power start-up or EN start-up. The

reference voltage in the FB control loop is fixed at

0.6V.

After the MP8869W starts up, the output voltage

can be controlled by the I2C through setting the

highest bit V_BOOT = 0. 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 output reference voltage can be

adjusted by the lower seven bits of register 00 in

the I2C loop. 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 in the I2C loop.

Table 3 shows the output voltage selection chart

from 0.6V to 1.55V in the I2C control loop.

NAME

BITS

DEFAULT

DESCRIPTION

V_BOOT

D[7]

FB control loop enable bit. V_BOOT = 1 means the output voltage is

determined by the resistor divider connecting to FB. The FB reference

voltage is fixed at 0.6V. V_BOOT = 0 means the output voltage is controlled

by I2C through VOUT. This bit is helpful for the default output voltage setting

before the I2C signal is active. If the I2C is not used, the part works well with

FB.

Output

reference

D[6:0]

001 1110

Set the output voltage from 0.6V to 1.55V (see Table 3). The default value is

0.825V.

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