Questions about MP8796B?

DC-DC Power Converters
1

HI MPS expert,
1.MP8796B datasheet describes the register has default value as below：
MFR_CTRL_VOUT [1:0]=00 =>Vref/Vout=1
VOUT_SCALE_LOOP=0X28C =>Vref/Vout=0.652
VOUT_COMMAND=0X1CC =>Vout=0.92v

In default mode, VOUT_SCALE_LOOP=0X28C (Vref/Vout=0.652) is not matched with MFR_CTRL_VOUT [1:0]=00 (Vref/Vout=1)
If we design it in internal voltage divider mode, what is the voltage output without any resigter programming?
2. datasheet secribes: It is not recommended to change VOUT_SCALE_LOOP (29h) and MFR_CTRL_VOUT (D1h[1:0]) when the power stage is enabled.
Does it mean MP8796B can’t be permitted to change the output voltage after power up?

Thanks

2

Hello allen.li,

I have seen your response and will get to it as soon as possible. I apologize for the delay, we are currently very limited on bandwidth.

Thank you,
Vinh Tran
Field Applications Engineer

3

Hello allen.li,

  1. The device comes default programmed to 0.92V. Please see table 1 and 2 for internal divider configurations:
    image
    image
  2. Do not change VOUT_SCALE_LOOP during output enable.

Thank you,
Vinh Tran
Field Applications Engineer