LM3655 Datasheet | National Semiconductor

Description The LM3655 provides plete charge control, discharge control and battery safety of a single Lithium-Ion cell. It supports battery charging by using a variety of power supply types including unregulated current-limited wall adapters, regulated wall adapters and vehicle power adapters. Charge current control is achieved using an external bipolar PNP power transistor. Furthermore, the LM3655 provides effective and prehensive discharge control functionality. All operating load current is supplied by the Li-Ion battery and passes through this IC. This allows the battery power to disconnect due to overload, short-circuit or low battery conditions. The IC also offers extensive battery safety protection against overvoltage and over-current. The internal safety circuit is backed up by an identical circuit to provide safety redundancy. The LM3655 requires minimal external ponents and is packaged in a micro surface mount device for integration in a single cell battery pack. 3.0 Features n n n n n n n n n n n n Input over-voltage protection for load and battery pack Input over-current protection for load and battery pack Reverse current protection Reverse charger protection Input short circuit protection that protects the cell from a short on the charger-connector Output overload current and short circuit protection plete charge control with pre-charging for depleted batteries, full-rate and trickle charging. Support for charging with regulated and non-regulated wall adapters and vehicle power adapters. Power regulation of the external Power PNP Chemistry selection for Li-ion and Li-polymer plete linear Peak detector function for filtering ripple on input power supply Digital filtering of the cell voltage transients during transmit pulses when LM3655 is used in a battery pack for cell phones. 25-pin, 2.5 mm x 2.5 mm micro SMD package for mounting on four layered PCB inside the battery pack. 2.0 Key Specifications n 1% precision pin-selectable nominal 4.10V and...