LTC4065LLTC4065LXLTC4065L-4.1LTC4065LX-4.1 Series

Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN

Catalog

Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN

Part	Supplier Device Package	Battery Chemistry	Battery Pack Voltage	Package / Case	Voltage - Supply (Max)	Number of Cells	Current - Charging	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Charge Current - Max [Max]
Analog Devices LTC4065LXEDC-4.1#TRPBF	6-DFN (2x2)	Lithium Ion	4.1 V	6-WFDFN Exposed Pad	5.5 V	1	Constant - Programmable	Surface Mount	85 °C	-40 °C	250 mA
Analog Devices LTC4065EDC-4.4#TRMPBF	6-DFN (2x2)	Lithium Ion	4.4 V	6-WFDFN Exposed Pad	5.5 V	1	Constant - Programmable	Surface Mount	85 °C	-40 °C	750 mA
Analog Devices LTC4065LXEDC#TRMPBF	6-DFN (2x2)	Lithium Ion	4.2 V	6-WFDFN Exposed Pad	5.5 V	1	Constant - Programmable	Surface Mount	85 °C	-40 °C	250 mA
Analog Devices LTC4065LEDC#TRPBF	6-DFN (2x2)	Lithium Ion	4.2 V	6-WFDFN Exposed Pad	5.5 V	1	Constant - Programmable	Surface Mount	85 °C	-40 °C	250 mA
Analog Devices LTC4065LXEDC#TRPBF	6-DFN (2x2)	Lithium Ion	4.2 V	6-WFDFN Exposed Pad	5.5 V	1	Constant - Programmable	Surface Mount	85 °C	-40 °C	250 mA
Analog Devices LTC4065LEDC-4.1#TRMPBF	6-DFN (2x2)	Lithium Ion	4.1 V	6-WFDFN Exposed Pad	5.5 V	1	Constant - Programmable	Surface Mount	85 °C	-40 °C	250 mA

Catalog

Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN

Key Features

• Charge Current Programmable up to 250mA with 5% Accuracy

• Complete Linear Charger in 2mm × 2mm DFN Package

• C/10 Charge Current Detection Output

• Timer Termination

• No External MOSFET, Sense Resistor or Blocking Diode Required

• Preset Float Voltage with 0.6% Accuracy:4.2V for LTC4065L/LTC4065LX4.1V for LTC4065L-4.1/LTC4065LX-4.1

• 4.2V for LTC4065L/LTC4065LX

• 4.1V for LTC4065L-4.1/LTC4065LX-4.1

• Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating

• Charge Current Monitor Output for Gas Gauging

• Automatic Recharge

• Charges Single Cell Li-Ion Batteries Directly from USB Port

• 20µA Supply Current in Shutdown Mode

• Available Without Trickle Charge (LTC4065LX/ LTC4065LX-4.1)

• Tiny 6-Lead (2mm × 2mm) DFN Package

Description

The LTC4065L is a complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. Its small size and ability to accurately regulate low charge currents make the LTC4065L especially well-suited for portable applications using low capacity rechargeable lithium-ion cells. Furthermore, LTC4065L is specifically designed to work within USB power specifications.TheCHRGpin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal timer terminates charging according to battery manufacturer specifications.The LTC4065L-4.1/LTC4065LX-4.1 features a constant-voltage float voltage of 4.1V. This 4.1V version of the standard LTC4065L/LTC4065LX is intended for back-up or high ambient temperature applications. Under these conditions, a reduced float voltage will trade-off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells.When the input supply (wall adapter or USB supply) is removed, the LTC4065L automatically enters a low current state, dropping battery drain current to less than 1µA. With power applied, LTC4065L can be put into shutdown mode, reducing the supply current to less than 20µA.The full-featured LTC4065L also includes automatic recharge, low-battery charge conditioning (trickle charging) and soft-start (to limit inrush current).Float Voltage (V)Charge Current RangePin 5 Is EN or ACPR?Trickle Charge?LTC40654.2V40mA to 750mAENYesLTC4065A4.2V40mA to 750mAACPRYesLTC4065-4.44.4V40mA to 750mAENYesLTC4065L4.2V8mA to 250mAENYesLTC4065LX4.2V8mA to 250mAENNoLTC4065L-4.14.1V8mA to 250mAENYesApplicationsCharger for Li-Ion Coin Cell BatteriesPortable MP3 Players, Wireless HeadsetsBluetooth ApplicationsMultifunction Wristwatches