ISL9214A: Li-ion/Li-Polymer Battery Charger Accepting Two Power Sources

The ISL9214A is a fully integrated low-cost single-cell Li-ion or Li-polymer battery charger. The charger accepts two power inputs, normally one from a USB (Universal Serial Bus) port and the other from a desktop cradle. The ISL9214A is an ideal charger for smart handheld devices that need to communicate with a personal computer via USB.

The ISL9214A features 28V maximum voltages for both the cradle and the USB inputs. Due to the 28V rated inputs, low-cost, large output tolerance adapters can be used safely. When both inputs are powered, the cradle input is used to charge the battery. The charge current is programmable for the cradle input with a small resistor. The end-of-charge current is also programmable by another external resistor. The charger incorporates Thermaguard™ which protects the IC against over-temperature. If the die temperature rises above a typical value of +125°C, a thermal foldback function reduces the charge current automatically to prevent further temperature rise. The charger has two indication pins. The PPR (power present) pin outputs an open-drain logic LOW when either the cradle or the USB input power is attached. The CHG (charge) pin is also an open-drain output that indicates a logic LOW when the charge current is above a minimum current level. When the charge current is below the preset minimum current, the CHG pin will indicate a logic HIGH signal. This status is latched and will be reset under one of the following events:

1. The part is disabled and re-enabled
2. The selected input source has been removed and reapplied
3. The USBON turns LOW
4. The BAT pin voltage falls below the recharge threshold (~3.9V)

Key Features
  • Complete Charger for Single-Cell Li-ion/Polymer Batteries
  • Dual Input Power Sources for Cradle and USB
  • Low Component Count
  • Integrated Pass Elements
  • Fixed 380mA USB Charge Current
  • Programmable Cradle Charge Current
  • Charge Current Thermaguard™ for Thermal Protection
  • 28V Maximum Voltages for Cradle and USB Inputs
  • Adapter Presence and Charge Indications
  • Less than 0.5µA Leakage Current Off the Battery When No Input Power Attached
  • Programmable End-of-Charge Current
  • Ambient Temperature Range: -40°C to +85°C
  • No External Blocking Diode Required
Applications
  • Smart Handheld Devices
  • Cell Phones, PDAs, MP3 Players
  • Digital Still Cameras
  • Handheld Test Equipment
Typical Diagram
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL9214A DatasheetPDF17 Nov 2014196 KB
Design Files
TitleTypeUpdatedSizeOther Languages
ISL9214AEVAL1Z Design FilesZIP----192 KB
User Guides
TitleTypeUpdatedSizeOther Languages
ISL9214AEVAL1Z User GuidePDF13 Nov 2014212 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Five Easy Steps to Create a Multi-Load Power SolutionPDF30 Jan 2017502 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL9214AIRZ10 Ld DFN0.022101260RoHS
ISL9214AIRZ-T10 Ld DFN T+R0.022101260RoHS
ISL9214AEVAL1ZN/ARoHS
Datasheet
ISL9214A Datasheet 17 Nov 2014
Other
ISL9214AEVAL1Z User Guide 13 Nov 2014
ISL9214A
ISL9214AEVAL1Z Design Files ----
10 Ld DFN ISL9000AM
Five Easy Steps to Create a Multi-Load Power Solution 30 Jan 2017