Semtech’s TS51111 includes a high efficiency synchronous rectifier to convert the input AC power signal to a DC output level for battery charging. The device supports both direct battery charging and indirect power applications. Low R_DS-on switches minimize power dissipation. High voltage input capability allows for simple and robust secondary side charger implementation. An integrated switch provides the battery charging path and, combined with the rectifier, provides back feed protection to the AC inputs. A precharge current source is also included for low battery voltage precharge operation. Communication capability is achieved using integrated high voltage switches.

The TS51111 includes several additional modules to allow simple integration into wireless power systems. Integrated resistor dividers with zero-current off-mode allow external ADC measurement of PDC, PACKP, USB, and thermistor voltages. High voltage switches are included for communication modulation. Power to an external controller is provided through an integrated LDO. The ultra-low quiescent current regulator can supply high output currents at low dropout with minimal current draw from the battery.