LTC4065
LTC4065A

PRODUCTION

Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN

Part Models: 4
1ku List Price: Starting From $1.33

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Part Details

Complete Linear Charger in 2mm × 2mm DFN Package
C/10 Charge Current Detection Output Timer Termination
Charge Current Programmable up to 750mA with 5% Accuracy
No External MOSFET, Sense Resistor or Blocking Diode Required
Preset 4.2V Float Voltage with 0.6% Accuracy
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate Without Risk of Overheating
ACPR Pin Indicates Presence of Input Supply (LTC4065A Only)
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
Soft-Start Limits Inrush Current
Tiny 6-Lead (2mm × 2mm) DFN Package

The LTC4065 is a complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. Its 2mm × 2mm DFN package and low external component count make the LTC4065 especially well-suited for portable applications. Furthermore, LTC4065 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 internal timer terminates charging according to battery manufacturer specifications.

No external sense resistor or blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates charge current to limit the die temperature during high power operation or high ambient temperature conditions.

When the input supply (wall adapter or USB supply) is removed, the LTC4065 automatically enters a low current state, dropping battery drain current to less than 1µA. With power applied, LTC4065 can be put into shutdown mode, reducing the supply current to less than 20µA.

The full-featured LTC4065 also includes automatic recharge, low-battery charge conditioning (trickle charging), soft-start (to limit inrush current) and an open-drain status pin to indicate the presence of an adequate input voltage (LTC4065A only).

The LTC4065 is available in a tiny 6-lead, low profile (0.75mm) 2mm × 2mm DFN package.


	Float Voltage (V)	Charge Current Range	Pin 5 Is EN or ACPR?	Trickle Charge?
LTC4065	4.2V	40mA to 750mA	EN	Yes
LTC4065A	4.2V	40mA to 750mA	ACPR	Yes
LTC4065-4.4	4.2V	40mA to 750mA	EN	Yes
LTC4065L	4.2V	8mA to 250mA	EN	Yes
LTC4065LX	4.2V	8mA to 250mA	EN	No
LTC4065L-4.1	4.1V	8mA to 250mA	EN	Yes

Applications

Wireless PDAs
Cellular Phones
Portable Electronics

Part Models: 4
1ku List Price: Starting From $1.33

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4065AEDC#TRMPBF	6-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4065AEDC#TRPBF	6-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4065EDC#TRMPBF	6-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4065EDC#TRPBF	6-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog Temperature Sensors 1
LTC2997	PRODUCTION	Remote/Internal Temperature Sensor
Battery Fuel Gauge and Coulomb Counter 1
LTC2942	NOT RECOMMENDED FOR NEW DESIGNS	Battery Gas Gauge with Temperature, Voltage Measurement
Low Voltage Hot Swap Controllers 1
LTC4361-1 LTC4361-2		Overvoltage/Overcurrent Protection Controller

Parts	Product Life Cycle	Description
LTC4065L LTC4065LX LTC4065L-4.1 LTC4065LX-4.1		Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN

Tools & Simulations

LTspice 1

LTC4065 - Battery Charger IC

Models for the following parts are available in LTspice:

LTC4065

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC4065EDC Demo Board | VIN = 3.75V to 5.25V, 650mA Standalone Li-Ion Linear Battery Charger

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Product Details

Demonstration circuit DC763 is a complete constant-current, constant-voltage battery charger designed to charge single-cell lithium-ion batteries. The DC763 is based on the LTC4065 that is available in a 2mm × 2mm DFN package and features an exposed bottom-side metal pad for soldering to the PC board. The LTC4065 features an internal MOSFET with thermal feedback loop that regulates the charge current to limit the die temperature during high power operation or high ambient thermal conditions. The preset float voltage is 4.2V with 0.6% accuracy, and the constant charge current is 650mA.