A Design of 5W High Voltage Low Drop Out Regulator in WPT System for Wearable device

In this paper, a High Voltage Low Drop Out Regulator for Wireless Power Transfer system is proposed. The proposed circuit consists Charge Pump, Over Current Protection, Error Amplifier and Soft Starter circuit. HV LDO can Sense & Limit 100mA to 1.6A. Charge Pump gives Supply Voltage to Error Amplifier. The Reason to use Charge Pump is to get low drop out. Charge Pump voltage has Rectifier Voltage plus 4V. Supply Voltage is 5V. Rectifier Voltage is 3.7V to 13.2V. LDO Input Voltage is LDO Output Voltage is 3.4 to 12.9V. LDO PSR is −53.8dB in 2kHz. The total size of the proposed circuit is
$\mathbf{1509}\mathbf{um}\times \mathbf{808}\mathbf{um}$
, which was designed in the BCD process. Also In this Process, when the voltage at both ends of the capacitor is different by 5V or more, break down is applied. A compensation method has been proposed to avoid breakdown.