The device provides an overvoltage protection (OVP) for boost converter output. The OVP comparator monitors the VOUT pin through internal resistor voltage dividers. If the VOUT pin voltage rises above the overvoltage threshold (V_OVTH), OVP is activated. When OVP is triggered, the device turns off the low-side driver and turns on the high-side driver until zero current is detected in diode emulation or skip mode. In FPWM mode, the low-side driver is not turned off when the OVP is triggered.

After at least 40 μs in OVP status, the device enters deep sleep mode and LM5152-Q1 turns on the high-side driver 100% while LM51521-Q1 turns the high-side driver off. The recommended VOUT capacitor (C_VOUT) is
0.1 μF.