LTC4069
Standalone 750mA Li-Ion
Battery Charger in 2 Г— 2 DFN
with NTC Thermistor Input
Description Features Complete Linear Charger in 2mm Г— 2mm DFN Package
n C/10 Charge Current Detection Output
n Timer Charge Terminatio Charge Current Programmable Up to 750mA with 5% Accuracy
n No External MOSFET, Sense Resistor or Blocking Diode Required
n NTC Thermistor Input for Temperature Qualified Charging
n Preset 4.2V Float Voltage with 0.6% Accuracy
n Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating
n Charge Current Monitor Output for Gas Gauging
n Automatic Recharge
n Charges Single-Cell Li-Ion Batteries Directly from USB Port
n 20ВµA Supply Current in Shutdown Mode
n Soft-Start Limits Inrush Current
n Tiny 6-Lead (2mm Г— 2mm) DFN Package
n Applications The LTCВ®4069 is a complete constant-current/constant-voltage linear charger for single-cell lithium-ion
batteries. The 2mm Г— 2mm DFN package and low external
component count make the LTC4069 especially well-suited
for portable applications. Furthermore, LTC4069 is specifically designed to work within USB power specifications.
The CHRG pin indicates when charge current has dropped
to ten percent of its programmed value (C/10). An …