Features and Benefits
- 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|
- Wireless PDAs
- Cellular Phones
- Portable Electronics
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
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.
Tools & Simulations
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.
Models for the following parts are available in LTspice:
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.