ISL6292

Li-ion/Li Polymer Battery Charger

OVERVIEW

The ISL6292 is an integrated single-cell Li-ion or Li-polymer battery charger capable of operating with an input voltage as low as 2.4V. This charger is designed to work with various types of AC adapters or a USB port.

The ISL6292 operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a CC/CV (constant current/constant voltage) profile. The charge current is programmable with an external resistor up to 2A. The ISL6292 can also work with a current-limited adapter to minimize the thermal dissipation, in which case, the ISL6292 combines the benefits of both a linear charger and a pulse charger.

The ISL6292 features charge current thermal foldback to guarantee safe operation when the printed circuit board is space limited for thermal dissipation. Additional features include preconditioning of an over-discharged battery, an NTC thermistor interface for charging the battery in a safe temperature range, automatic recharge, and thermally enhanced QFN or DFN packages.

KEY FEATURES

  • Complete Charger for Single-Cell Li-ion Batteries
  • Very Low Thermal Dissipation
  • Integrated Pass Element and Current Sensor
  • No External Blocking Diode Required
  • 1% Voltage Accuracy
  • Programmable Current Limit up to 2A
  • Programmable End-of-Charge Current
  • Charge Current Thermal Foldback
  • NTC Thermistor Interface for Battery Temperature Monitor
  • Accepts Multiple Types of Adapters or USB BUS Power
  • Guaranteed to Operate at 2.65V After Start-Up
  • Ambient Temperature Range: -20°C to +70°C
  • Thermally-Enhanced QFN Packages
  • Handheld Devices, including Medical Handhelds
  • PDAs, Cell Phones and Smart Phones
  • Portable Instruments, MP3 Players
  • Self-Charging Battery Packs
  • Stand-Alone Chargers
  • USB Bus-Powered Chargers
  • Pb-Free Available (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6292
Basic Information
Production Status
Mass Production
Output Voltage Typ (V)
4.1, 4.2
Voltage Accuracy (%)
1
VIN1 (max) (V)
7
Output Current 1 Max (A)
2.1
Safety Timer
Yes
Self Termination
Yes
Accepts CC Adapter
Yes
VIN1 Trickle Charge (min) (% CC)
10
Thermal Regulation
Yes
Function(s)
Enable, Charge Status, Fault Indication, NTC Input, Timeout Disable, Programmable IMIN, Reference Voltage
Battery Chemistry
Single Cell Li+/Polymer
Qualification Level
Standard
Can Sample
YES
Temperature Range
See Datasheet

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