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TPS61251 Minimum Output Capacitance for Stability
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Q: TPS61251 Minimum Output Capacitance for Stability by 556517
TPS61251 Minimum Output Capacitance for Stability?
The datasheet indicates the TPS61251 is stable with output capacitor values greater than 150uF. The intent of the statement is to point out that this device can handle large output capacitances and not cause instability. What the statement doesn't clearly indicate is if 150uF is the absolute minimum required capacitance needed on the output to be stable.
Please help clarify: What is the minimum necessary output cap necessary for stability? Ceramic output caps are being assumed.
Background reason: Application would be to use the input current limiting feature of the boost + boost, but with minimum space required and hence low output capacitances.
A: Re: TPS61251 Minimum Output Capacitance for Stability by 1090425
If they don't need to charge large caps, then they should use the TPS61252 which is designed for regular output caps around 22uF. This will give the smallest solution size.
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