SLUSAU4B DECEMBER 2011 – February 2019 TPS53219A
When EN becomes low, the TPS53219A discharges output capacitor using internal MOSFET connected between the SW pin and the PGND pin while the high-side and low-side MOSFETs are maintained in the OFF state. The typical discharge resistance is 40 Ω. The soft discharge occurs only as EN becomes low. After VREG becomes low, the internal MOSFET turns off and the discharge function becomes inactive.