UB10803

DESCRIPTION

The UTC UB10803 is a fully-integrated single-cell Li-ion/Polymer

battery charger. The device operates without external FET and

blocking diode, and employs a constant-current constant-voltage

(CC/CV) charging profile.

The  fast-charge  and  end-of-charge  (EOC)  currents  are

programmable with independent external resistors. When the battery

is deeply discharged to lower than 2.75V, the charger firstly

pre-charges the battery with typically 20% of the programmable

fast-charge current. When the charge current is reduced to the

programmed EOC current level (almost works completely in a

constant-voltage (CV) mode), an EOC indication is displayed through

the CHG pins. The UTC UB10803 is protected by thermal regulation

technology to prevent the IC from over-heat during charging.

Two status indication pins (PPR and CHG), which are both

implemented as an open-drain outputs, can be used to drive LEDs or

work as logic interface to a microprocessor. When no adapter is

attached or when the charger is disabled, the leakage current from

battery cell is less than 1uA typically.

FEATURES

* A Constant-Current/Constant-Voltage Linear Charger

for Single-Cell Li-ion/Polymer Batteries

* Integrated Pass Element and Current Sensor

* Highly-Integrated, Requiring No External FETs or

Blocking Diode

* 4.2V Voltage Accuracy: ±1.2% All Temperatures

(Available with 4.10V and 4.36V options upon request)

* Programmable Charge Current 50mA to 500mA

* Programmable End-Of-Charge Current by Current

Recharge Algorithm

* Pre-Charge for Fully Discharged Batteries

* 1μA (Typ.) Leakage Current of the Battery when No

Input Power is Attached or Charger is Disabled

* Power Present and Charge Status Indications

* Thermal Regulation on Charging Current to Prevent

Over-Heat

* Few Components, Cost-Effective Solutions

规格书UB10803