Alternative Parts

Overview

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

Product Details

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

Product Lifecycle icon-recommended 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)

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Models for the following parts are available in LTspice:

LTC4065

Product Recommendations

LTC4065 Companion Parts

Recommended Related Parts

Design Resources

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Evaluation Boards Pricing displayed is based on 1-piece.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.