DESCRIPTION
The LTC®4088-1/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.

FEATURES
■ Switching Regulator Makes Optimal Use of Limited
   Power Available from USB Port to Charge Battery
   and Power Application
■ 180mΩ Internal Ideal Diode Plus External Ideal Diode
   Controller Seamlessly Provide Low Loss Power Path
   When Input Power is Limited or Unavailable
■ Automatic Charge Current Reduction Maintains 3.6V Minimum VOUT
■ Full Featured Li-Ion/Polymer Battery Charger
■ VBUS Operating Range: 4.25V to 5.5V (7V Absolute Maximum—Transient)
■ 1.2A Maximum Input Current Limit
■ 1.5A Maximum Charge Current with Thermal Limiting
■ Bat-Track™ Adaptive Output Control
■ Slew Control Reduces Switching EMI
■ Low Profile (0.75mm) 14-Lead 4mm × 3mm DFN Package

APPLICATIONS
■ Media Players
■ Digital Cameras
■ GPS
■ PDAs
■ Smart Phones