8.1 Overview

The TPD1S514 Family provides single-chip ESD, surge, and over voltage protection solutions for portable USB Charging and Host interfaces. Each device offers over voltage protection at the V_{BUS_CON} pin up to 30-V DC. The TPD1S514 Family offers an ESD and Precision Clamp for the V_{BUS_CON} pin, thus eliminating the need for external TVS clamp circuits in the application.

Each device has an internal oscillator and charge pump which controls turning ON the internal nFET switch. The internal oscillator controls the timers which enable the charge pump. If V_{BUS_CON} is less than V_OVP, the internal charge pump is enabled. After a 20 ms internal delay, the charge-pump starts-up, and turns ON the internal nFET switch through a soft start. If at any time V_{BUS_CON} rises above V_OVP, the nFET switch is turned OFF within 100 ns.

The TPD1S514 Family of devices also have a V_{BUS_POWER} pin which follows V_{BUS_CON} up to 4.9 V at 3 mA (except for TPD1S514, which follows V_{BUS_CON} up to 6.48 V, after which it is regulated to that voltage) to power the system from V_{BUS_CON}. In the case where the system battery state cannot power the system, voltage from an external charger can be provided to power the system. V_{BUS_POWER} is supplied by an always on LDO regulator supplied by V_{BUS_CON}. V_{BUS_POWER} output voltage remains regulated to 4.9 V (except for TPD1S514, which follows V_{BUS_CON} up to 6.48 V, after which it is regulated to that voltage) at up to 30-V DC on V_{BUS_CON} and during IEC 61000-4-5 surge events of up to 100 V open circuit voltage on V_{BUS_CON}.