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LM2776: LM2776DBVR design

ilya tashaev
Prodigy 115 points
Part Number: LM2776

Hello

i have designed a negative 5V supply with the LM2776DBVR

as i read the datasheet i'm not sure what would be the best C FLY to chose ?

i chose 2 x 4.7uF  ?

for the input / output i chose 10uF / 10uF (although the EVM has 2 x 10uF at the input)

i have attached the schematic please check if it is ok ?

  • 0
    TI__Mastermind 21810 points

    Hi,

    Please note that it is not possible to get exactly -5Vout from +5Vin due to the inherent losses in the Charge pump.

    The schematic looks good. However, I would recommend to use a lower Cfly like 1uF with 10uF input & output capacitor. 

    Regards,

    Febin