LITHIUM-ION AND LITHIUM-POLYMER

DESCRIPTION

UTC  UB2011 used for 1-4 Series Circuit cells charging  is

designed for portable electronics with lower cost. Its advantages of

high-accuracy voltage/current regulation, charging status indication,

temperature monitoring. In applications, the battery temperature is

continuously under monitor by using an external thermistor, if the

temperature is over user-defined threshold; UTC UB2011 inhibits

charge for safety concern.

UTC  UB2011 charges the battery in conditioning, constant

voltage and constant current phases. If the battery voltage is lower

than the low-voltage threshold, a low current is used for

conditioning the battery. After the conditioning phase, the UTC

UB2011 applies a constant current that be set by an external

sense-resistor to the battery. The sense-resistor can be on the

battery without additional components. The constant current phase

continues until the battery reaches the charge-regulation voltage,

then the constant voltage phase is beginning. Charge stops when

the current tapers to the charge termination threshold.

FEATURES

* Ideal for 1-4 Series Circuit Cell Li-Ion or Li-Pol Packs

* High Accuracy of Voltage Regulation With Preset Voltages

* Optional Cell-Temperature Monitoring

* Current Regulation With Programmable Charge-Current

* Charge Termination by Minimum Current

* With Short-Circuit Protection

* With Thermal Protection

* Charge Status Output Pin

* Available for Linear and Switch-Mode charging