LTC4057 datasheet, PDF - EEWORLD Datasheet

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LTC4057: DescriptionStandalone 250mA Li-Ion Battery Charger in 2 Ã 2 DFN; File Size198KB，18 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC4057 Overview

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

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FEATURES

LTC4065L/

LTC4065LX/LTC4065L-4.1

Standalone 250mA Li-Ion

Battery Charger in 2

2 DFN

DESCRIPTION

The LTC

4065L 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.

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.

The LTC4065L-4.1 features a constant-voltage float voltage

of 4.1V. This 4.1V version of the standard LTC4065L is in-

tended 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 re-

charge, low-battery charge conditioning (trickle charging)

and soft-start (to limit inrush current).

Complete Charge Cycle (180mAh Battery)

LTC4065L and LTC4065LX

110

100

100mA

BAT

CHARGE CURRENT (mA)

4.3

CONSTANT

VOLTAGE

CHRG

TRANSITION

4.1

3.9

3.7

CHARGE

TERMINATION

= 5V

PROG

= 2k

0.5

1.5 2 2.5 3

TIME (HOURS)

3.5

4.5

4065lfb

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/LTC4065LX

4.1V for LTC4065L-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)

Tiny 6-Lead (2mm

2mm) DFN Package

APPLICATIONS

Charger for Li-Ion Coin Cell Batteries

Portable MP3 Players, Wireless Headsets

Bluetooth Applications

Multifunction Wristwatches

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6522118, 6700364.

TYPICAL APPLICATION

Standalone Li-Ion Battery Charger

4.3V TO 5.5V

1μF

90 CONSTANT

CURRENT

BATTERY VOLTAGE (V)

510Ω

LTC4065L

CHRG

PROG

GND

4.2V

Li-Ion

BATTERY

4065L TA01

3.5

3.3

4065 TA02

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