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LTC4065/LTC4065A

4065fb

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Cellular Phones

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Portable Electronics

Standalone 750mA Li-Ion

Battery Charger in 2

× 2 DFN

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Complete Linear Charger in 2mm

××××× 2mm DFN

Package

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C/10 Charge Current Detection Output

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Timer Termination

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Charge Current Programmable up to 750mA with

5% Accuracy

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No External MOSFET, Sense Resistor or Blocking

Diode Required

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Preset 4.2V Float Voltage with 0.6% Accuracy

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Constant-Current/Constant-Voltage Operation with

Thermal Feedback to Maximize Charging Rate

Without Risk of Overheating

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ACPR Pin Indicates Presence of Input Supply

(LTC4065A Only)

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Charge Current Monitor Output for Gas Gauging

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Automatic Recharge

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Charges Single Cell Li-Ion Batteries Directly from

USB Port

µA Supply Current in Shutdown Mode

× 2mm) DFN Package

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

+

R1

510

Ω

R2*

1

Ω

500mA

R3

2k

4065 TA01

4.2V

Li-Ion

BATTERY

4.3V TO 5.5V

C1

1

µF

*SERIES 1

Ω RESISTOR ONLY NEEDED FOR INDUCTIVE INPUT SUPPLIES

LTC4065

CHRG

EN

BAT

PROG

GND

The LTC

voltage linear charger for single-cell lithium-ion batteries.

Its 2mm

×2mmDFNpackageandlowexternalcomponent

count make the LTC4065 especially well-suited for por-

table 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 manufac-

turer specifications.

No external sense resistor or blocking diode is required

due to the internal MOSFET architecture. Thermal feed-

back 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 1

µA.With

power applied, LTC4065 can be put into shutdown mode,

reducing the supply current to less than 20

µA.

The full-featured LTC4065 also includes automatic re-

charge, low-battery charge conditioning (trickle charg-

ing), 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.

Standalone Li-Ion Battery Charger

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.