When LDO is used in handheld products, attention must be paid to voltage spikes which could damage SGM2032.In such applications, voltage spikes will be generated at charger interface and V BUS pin of USB interface whencharger adapters and USB equipments are hot-plugged. Besides this, handheld products will be tested on theproduction line without battery. Test engineer will apply power from the connector pin which connects with positivepole of the battery. When external power supply is turned on suddenly, the voltage spikes will be generated at thebattery connector. The voltage spikes will be very high, and it always exceeds the absolute maximum input voltage(6.0V) of LDO. In order to get robust design, design engineer needs to clear up this voltage spike. Zener diode is acheap and effective solution to eliminate such voltage spike. For example, BZM55B5V6 is a 5.6V small packageZener diode which can be used to remove voltage spikes in cell phone designs. The schematic is shown below.