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TPS631000: Switching from PFM to PWM

Part Number: TPS631000

Hi Team,

With the regulator enabled and stable input supply. How long will it take for the buck-boost to transition from PFM mode to PWM mode from the time MODE pin changes state?

Need to be in PFM mode while in essentially a standby output load and then transition to PWM before load transient because of the desire for a predictable Fsw when at max load. 

Thank you,

Trenton Reed