The LTC4088-1/LTC4088-2 is a high efficiency USB PowerPath™controller and Li-Ion/Polymer battery charger. It includes a synchronous switching input regulator, a full-featured battery charger and an ideal diode. Designed specifically for USB applications, the LTC4088-1/LTC4088-2's switching regulator automatically limits its input current to either 100mA, 500mA or 1A via logic control. The LTC4088-1 powers-up with the charger off; the LTC4088-2 powers-up with the charger on.The switching input stage provides power to VOUTwhere power sharing between the application circuit and the battery charger is managed. Charge current is automatically reduced to maintain a regulated 3.6V VOUTduring low-battery conditions. As the battery is charged, VOUTtracks VBATfor high efficiency charging. This feature allows the LTC4088-1/LTC4088-2 to provide more power to the application and eases thermal issues in constrained applications.An ideal diode ensures that system power is available from the battery when the input current limit is reached or if the USB or wall supply is removed. The LTC4088-1/LTC4088-2 is available in the low profile 14-Lead 4mm × 3mm × 0.75mm DFN surface mount package.Input Logic Truth TableAutomatic Charge Current Reduction3.3V LDOLTC4088Battery charger enabled with all logic inputs groundedNoYesLTC4088-1Battery charger enabled with all logic inputs groundedYesNoLTC4088-2Battery charger enabled with all logic inputs groundedYesNoApplicationsMedia PlayersDigital CamerasGPSPDAsSmart Phones