LTC4061| Datasheet

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LTC4061 Standalone Linear Li-Ion Battery Charger with Thermistor Input

Charge Current Programmable Up to 1A Charges Single-Cell Li-Ion Batteries Directly from USB Port Preset Charge Voltage with 0.35% Accuracy Thermistor Input for Temperature Qualified Charging Input Supply Present Logic Output Thermal Regulation Maximizes Charge Rate Without Risk of Overheating Programmable Charge Current Detection/ Termination Programmable Charge Termination Timer Smart Pulsing Error Feature SmartStartTM Prolongs Battery Life 20uA Charger Quiescent Current in Shutdown Available in a Low Profile (0.75mm) 10-Lead (3mm 3mm) DFN Package

The LTC 4061 is a full-featured, flexible, standalone linear charger for single-cell Lithium-Ion batteries. It is capable of operating within USB power specifications. Both programmable time and programmable current based termination schemes are available. Furthermore, the CHRG open-drain status pin can be programmed to indicate the battery charge state according to the needs of the application. Additional safety features designed to maximize battery lifetime and reliability include NTC battery temperature sensing and the SmartStart charging algorithm. No external sense resistor or external blocking diode is required for charging due to the internal MOSFET architecture. Internal thermal feedback regulates the charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The charge current is programmed with an external resistor. With power applied, the LTC4061 can be put into shutdown mode to reduce the supply current to 20uA and the battery drain c
urrent to less than 5uA. Other features include smart recharge, USB C/5 current programming input, undervoltage lockout and AC Present logic output.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. SmartStart is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118.

APPLICATIO S

Handheld Computers Portable MP3 Players Digital Cameras

800mA Single-Cell Li-Ion Battery Charger (C/10 Termination)
VIN 4.3V TO 8V 1uF 800mA VCC EN C/5 BAT CHRG LTC4061 ACPR NTC GND
4061 TA01a

CHARGE CURRENT (mA)

TIMER PROG IDET 619

TYPICAL APPLICATIO

Complete Charge Cycle (1100mAh Battery)
900 800 700 600 500 400 300 200 100 0 0 VCC = 5V TA = 25 C 0.5 1.0 1.5 2.0 TIME (HOURS) 2.5 BATTERY VOLTAGE BATTERY CURRENT 4.3 4.2 4.1 BATTERY VOLTAGE (V) 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.0

4.2V SINGLE-CELL Li-Ion BATTERY

U
4061 TA01b

FEATURES

DESCRIPTIO

4061fc