MP8868 – SYNCHRONOUS STEP-DOWN CONVERTER

MP8868 Rev.1.1

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17

5/15/2015

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voltage scaling instruction, if V_BOOT=“1”,

output voltage is determined by the resistor

default value is 0.6V):

)

R2

R1

(1

V

V

REF

OUT

+

×

=

If V_BOOT=“0”, the output voltage will be

loop is disabled.

The output reference voltage scaling is realized

by adjusting internal reference voltage V_REF

which is the non-invert input of error amplifier.

After MP8868 receives a valid data byte of

output reference voltage setting, it searches the

corresponding reference voltage from the truth

table and then sends the command of adjusting

Vref with controlled slew rate. The slew rate is

determined by 3 bits of another register which

can be read and write accordingly.