MP8864

– SYNCHRONOUS STEP-DOWN CONVERTER

MP8864 Rev. 1.02

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17

1/18/2018

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If

V_BOOT=

“0,”

the

output

voltage

is

voltage is sensed through VOUT), and the FB

feedback control loop is disabled.

If FB is pulled up to VCC, the chip starts up

directly to the default 0.9 V output voltage. In

this case, the output voltage is determined by

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 MP8864 receives a

valid data byte of the output reference voltage

setting, it searches the truth table for the

corresponding

reference

voltage

and

then

sends the command to adjust Vref with the

controlled

slew

rate.

The

slew

rate

is

determined by 3 bits of another register, which

can be read and write, accordingly.