The  SM5451  is a  highly integrated quadruple-mode switched capacitor charger that integrates an infinite regulation loop and a very accurate 12-Bit ADC. The device features not only a  switched-capacitor architecture for a current doubler mode but also a path- through topology for a bypass mode.  

This very high efficiency switched capacitor charger with a very low R DS_ON  resistance reduces the thermal dissipation of a fast-charging system, which results in shorter charging time. The device integrates a stand-alone infinite regulation loop for IBUS, VBAT and IBAT using an internal Q RB  switch. The device also includes a  very accurate  12-bit  ADC  to provide input voltage, input current, output voltage, output current, THEM pin and die temperature needed to manage the charging profile of fast charging system. The device integrated powerful protection schemes such as over-voltage, over-current, under-current, over-temperature, a  flying capacitor short-circuit, and a watchdog timer to secure a robust charging for the system.  

The SM5451 is available in 42-bumps WLCSP package.