MP8869GL datasheet(26/37 Pages) MPS

26 / 37 page

MP8869

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

PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE

MP8869 Rev.1.0

www.MonolithicPower.com

6/8/2016

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

3) Reg02 SysCntlreg2

The highest two bits of the PG deglitch time D[7:6]

defines the power good signal rising and falling

edge delay times. When output OVP or UVP is

triggered, the PG signal turns low or high after a

delay time. There are four levels of PG delay time

that can be programmed by the I

2C in different

conditions.

The two switching frequency bits D[5:4] are used

for switching frequency selection. The MP8869

supports up to 1.25MHz of switching frequency by

setting the two bits to 11. The MP8869 maximum

programmable switching frequency is limited by the

internal minimum on-time (see Table 1).

The bit Soft Stop defines the output voltage

discharge behavior after EN shutdown. When Soft

Stop is set to 0, the output voltage is not controlled

after EN shutdown. When Soft Stop is set to 1, the

output voltage is discharged linearly to zero with

the set soft-stop time.

The lowest three bits, Current Limit Adjust D[2:0],

are used for peak and valley current-limit selection.

There are eight levels of current limit that can be

selected for different application conditions.

NAME

BITS

DEFAULT

DESCRIPTION

PG deglitch

time

D[7:6]

Power good signal rising and falling edges

’ delay time. When FB or

VOUT is out of the regulation window, the PG comparator is triggered,

but needs a delay time before the PG signal can turn high or low.

D[7:6]

PG deglitch

D[7:6]

PG deglitch

μs

Switching

frequency

D[5:4]

Switching frequency set bit. There is no dedicated frequency oscillator

inside the part. The switching frequency is fairly fixed by controlling the

TON timer.

D[5:4]

Frequency

D[5:4]

Frequency

500kHz

1MHz

750kHz

1.25MHz

Soft stop

D[3]

This bit defines the VOUT discharge behavior after EN

shutdown. “0”

means VOUT

is not controlled after EN shutdown; “1” means VOUT is

discharged linearly to zero with the set soft-stop time.

Current limit

adjust

D[2:0]

001

D[2:0]

Valley current limit (A)

D[2:0]

Valley current limit (A)

000

100

8.5

001

101

010

110

011

111

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