JAJSBO6B June 2012 – May 2019 TPS54678
PRODUCTION DATA.
The TPS54678 has an integrated boot regulator and requires a small ceramic capacitor between the BOOT and PH pin to provide the gate drive voltage for the high-side MOSFET. The value of the ceramic capacitor should be 0.1 µF. A ceramic capacitor with an X7R or X5R grade dielectric is recommended because of the stable characteristics over temperature and voltage.
To improve dropout, the TPS54678 is designed to operate at 100% duty cycle as long as the BOOT to PH pin voltage is greater than 2.2 V. The high-side MOSFET is turned off using an UVLO circuit, allowing for the low-side MOSFET to conduct, when the voltage from BOOT to PH drops below 2.2 V. Because the supply current sourced from the BOOT pin is low, the high-side MOSFET can remain on for more switching cycles than are required to refresh the capacitor, thus the effective duty of the switching regulator is high.