SLVSDN4 June 2017 TPS82150
The TPS82150 offers a low input to output voltage differential by entering 100% duty cycle mode. In this mode, the high-side MOSFET switch is constantly turned on. This is particularly useful in battery powered applications to achieve longest operation time by taking full advantage of the whole battery voltage range. The minimum input voltage to maintain a minimum output voltage is given by:
RDP = Resistance from VIN to VOUT, including high-side FET on-resistance and DC resistance of the inductor
VOUT(min) = Minimum output voltage the load can accept.