ISL6294 В® Data Sheet July 9, 2007 FN9174.4 High Input Voltage Charger Features The ISL6294 is a cost-effective, fully integrated high input
voltage single-cell Li-ion battery charger. The charger uses a
CC/CV charge profile required by Li-ion batteries. The
charger accepts an input voltage up to 28V but is disabled
when the input voltage exceeds the OVP threshold, typically
6.8V, to prevent excessive power dissipation. The 28V rating
eliminates the overvoltage protection circuit required in a low
input voltage charger. Complete Charger for Single-Cell Li-ion/Polymer Batteries The charge current and the end-of-charge (EOC) current are
programmable with external resistors. When the battery voltage
is lower than typically 2.55V, the charger preconditions the
battery with typically 20% of the programmed charge current.
When the charge current reduces to the programmable EOC
current level during the CV charge phase, an EOC indication is
provided by the CHG pin, which is an open-drain output. An
internal thermal foldback function protects the charger from any
thermal failure. Programmable End-of-Charge Current Two indication pins (PPR and CHG) allow simple interface to
a microprocessor or LEDs. When no adapter is attached or
when disabled, the charger draws less than 1ВµA leakage
current from the battery. Integrated Pass Element and Current Sensor No External Blocking Diode Required Low Component Count and Cost 1% Voltage Accuracy Programmable Charge Current Charge Current Thermal Foldback for Thermal
Protection Trickle Charge for Fully Discharged Batteries 28V Maximum Voltage for the Power Input Power Presence and Charge Indications Less Than 1ВµA Leakage Current off the Battery When No
Input Power Attached or Charger Disabled Ambient Temperature Range: -40В°C to +85В°C 8 Ld 2x3 DFN and 8 Ld SOIC Packages Pb-Free Plus Anneal Available (RoHS Compliant) Ordering Information
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