JAJSHL2 June 2019 TPS652170
PRODUCTION DATA.
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The converter starts to go to the 100% duty-cycle mode after the input voltage (VIN) comes close to the nominal output voltage. To keep the output voltage steady, the high-side MOSFET is turned on 100% for one or more cycles. As the VIN voltage decreases further, the high-side MOSFET is turned on completely. In this case, the converter offers a low input-to-output voltage difference which is particularly useful in battery-powered applications to achieve longest operation time by taking full advantage of the whole battery voltage range.
Use Equation 2 to calculate the minimum input voltage to keep regulation (VIN,MIN) which depends on the load current and output voltage.
where