ZHCSNO6B February 2023 – March 2024 TPS628301 , TPS628302 , TPS628303 , TPS628304
PRODUCTION DATA
There is no limitation for small duty cycles because, even at very low duty cycles, the switching frequency is reduced as needed to always make sure of a proper regulation.
If the output voltage (VOUT) comes close to the input voltage (VIN), the device enters 100% mode. While the high-side switch is constantly turned on, the low-side switch is switched off. This action is particularly useful in battery-powered applications to achieve longest operation time by taking full advantage of the whole battery voltage range. The difference between VIN and VOUT is determined by the voltage drop across the high-side FET and the DC resistance of the inductor. The minimum VIN that is needed to maintain a specific VOUT value is estimated as:
where