The LTC4095EDC is a complete constant-current/constant-voltage linear charger for single-cell lithium-ion/polymer batteries. Its small 2mm × 2mm DFN package and low external component count make the LTC4095EDC especially well-suited for portable USB power applications.
Up to 950mA of charge current may be programmed via a single resistor from the PROG pin to ground. The HPWR pin allows the charge current to be set at 20% or 100% of its full-scale programmed value. An internal safety timer terminates charge current. The final float voltage is preset to 4.2V and held to a tight 0.5% tolerance. Also featured is an NTC thermistor input to monitor battery temperature while charging, a C/10 current detection output, automatic recharge, bad-battery detection and low-battery trickle charge. A thermal feedback loop regulates the charge current to limit the die temperature during high power operation or high ambient thermal conditions.
The LTC4095EDC is available in a tiny, low profile (0.75mm) 8-lead 2mm × 2mm DFN package.
Feature
- Full-Featured Standalone USB Li-Ion/Polymer Battery Charger
- 100mA to 950mA Programmable Charge Current
- C/10 Charge Current Detection Output
- Internal Safety Timer Termination
- NTC Thermistor Input for Temperature Qualified Charging
- Preset 4.2V Float Voltage with 0.5% Accuracy
- Constant-Current/Constant-Voltage Operation with Thermal Feedback
- Charge Current Monitor Output for Gas Gauging
- Automatic Recharge
- Bad-Battery Detection
- 8.5µA Input Supply Current in Suspend Mode
- Tiny 8-Lead (2mm × 2mm) DFN Package
Applications
- PDAs
- Media Players
- Cellular Phones
- Other Portable Electronics
(Picture: Pinout)
