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TPS62822: FB Resister

Satoshi Yone
Expert 3600 points
Part Number: TPS62822

Hi, Team,

In the datasheet 9.2.2, it is recommended that the current value of the FB circuit is around 5μA. For 1.8 V, a customer would like to use the below value. Since the IC inflow current of FB is described as 10 nA, it means that the output voltage drops by about 0.2%. The resistance value of the capacitor of CNF also becomes 1/10, so they plans to change capacitor 120PF ⇒ 1000PF. If there any concern with the above setting?

FB/GND 10kohm
FB/Vout 20kohm

Best Regards,
Satoshi Yone

  • 0
    TI__Genius 17301 points

    Hi Satoshi,

    Equation 8 in TPS62822 data sheet shows cff value depends on FB/GND resistor and according to me this values are fine. Please can you explain more about  "the IC inflow current of FB is described as 10 nA, it means that the output voltage drops by about 0.2%".

    Best Regards,

    Tanvee