描述 Description

UTC UB2017 is a complete, constant current and constant voltage linear charger for single cell lithium-ion batteries. Its small size and ability to regulate low charge currents make UTC UB2017 especially well-suited for portable applications using low capacity rechargeable lithium-ion coin cells. Furthermore, UTC UB2017 is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. UTC UB2017 automatically terminates a charge cycle when the?charge current drops to 1/10th the programmed value after the final float voltage is reached.

特性 Features

? ?Programmable Charge Current Up to 500mA.
? ?No External MOSFET, Sense Resistor or Blocking Diode Required.
? ?Complete linear charger in Thin SOT Package for Single Cell / Coin Cell Lithium-lon Batteries.
? ?Constant Current / Constant Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk
? of Overheating.
? ?Charges Single Cell Li-lon Batteries Directly form USB Port.
? ?Preset 4.2V Charge Voltage with High Accuracy about ±1.2%.
? ?Automatic Recharge.
? ?2.9V Trickle Charge Threshold.
? ?25μA Max Supply Current in Shutdown Mode.
? ?Charge Status Output Pin.