SLUSCC7C July 2016 – June 2018 TPS546C23
The devices have two onboard linear regulators to provide suitable power for the internal circuitry of the device. Bypass the BP3 and BP6 pins externally for the converter to function properly. The BP3 pin requires a minimum of 2.2 µF of capacitance connected to AGND. The BP6 pin requires a minimum 2.2 µF of capacitance connected to PGND. TI recommends using a 4.7-µF capacitor and an additional 100-nF capacitor to reduce the ripple on the BP6 pin.
Place bypass capacitors as close as possible to the device pins, with a minimum return loop back to ground and the return loop should be kept away from fast switching voltage and main current path. For more information, see the Layout section. Poor bypassing can degrade the performance of the regulator.
The use of the internal regulators to power other circuits is not recommended because the loads placed on the regulators might adversely affect operation of the controller.