MP8869GL datasheet(23/37 Pages) MPS

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MP8869

– 17V, 12A, SYNCHRONOUS STEP-DOWN CONVERTER

MP8869 Rev.1.0

www.MonolithicPower.com

6/8/2016

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

REGISER DESCRIPTION

The MP8869 contains six write or read registers.

hiccup OCP, etc. Register 02 is the second

system control register, and users can use to set

the switching frequency, current limit, etc.

and 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 IC is in an over-current protection,

over-temperature protection status, etc. The

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

determined by the FB resistor divider after the

MP8869 power start-up or EN start-up. The

reference voltage in the FB control loop is fixed

at 0.6V.

After the MP8869 starts up, the output voltage

can be controlled by the I

2C 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 I

2C 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 I

loop.

Table 3 shows the output voltage selection chart

from 0.6V to 1.87V in the I

2C 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 the I

2C through VOUT. This bit is helpful for the default output voltage

setting before the I

2C 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 1.87V (see Table 3). The default value

is 0.9V.

MP8869GL Datasheet(PDF) 23 Page - Monolithic Power Systems

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