LTC4061-4.4 데이터 시트보기 (PDF) - Linear Technology

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LTC4061-4.4

Standalone Linear Li-Ion Battery Charger with Thermistor Input

Linear Technology 

FEATURES

■ Charge Current Programmable Up to 1A

■ Charges Single-Cell Li-Ion Batteries Directly from

USB Port

■ Preset 4.375V Float Voltage with ±0.4% Accuracy

■ Thermistor Input for Temperature Qualified

Charging

■ Input Supply Present Logic Output

■ Thermal Regulation Maximizes Charge Rate

Without Risk of Overheating

■ Programmable Charge Current Detection/

Termination

■ Programmable Charge Termination Timer

■ Smart Pulsing Error Feature

■ SmartStartTM Prolongs Battery Life

■ 20µA Charger Quiescent Current in Shutdown

■ Available in a Low Profile (0.75mm) 10-Lead

(3mm × 3mm) DFN Package

U

APPLICATIO S

■ Handheld Computers

■ Portable MP3 Players

■ Digital Cameras

LTC4061-4.4

Standalone Linear Li-Ion Battery

Charger with Thermistor Input

DESCRIPTIO

The LTC®4061-4.4 is a full-featured, flexible, standalone

linear charger for single-cell 4.375V Lithium-Ion batteries. It

is capable of operating within USB power specifications.

Both programmable time and programmable current

based termination schemes are available. Furthermore,

the CHRG open-drain status pin can be programmed to

indicate the battery charge state according to the needs

of the application. Additional safety features designed to

maximize battery lifetime and reliability include NTC bat-

tery temperature sensing and the SmartStart charging

algorithm.

No external sense resistor or external blocking diode is

required for charging due to the internal MOSFET archi-

tecture. Internal thermal feedback regulates the charge

current to maintain a constant die temperature during high

power operation or high ambient temperature conditions.

The charge current is programmed with an external resis-

tor. With power applied, the LTC4061-4.4 can be put into

shutdown mode to reduce the supply current to 20µA and

the battery drain current to less than 5µA.

Other features include smart recharge, USB C/5 cur-

rent programming input, undervoltage lockout and AC

Present logic output.

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

SmartStart is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6522118.

TYPICAL APPLICATIO

VIN

4.5V TO 8V

800mA Single-Cell Li-Ion Battery Charger

(C/10 Termination)

1µF

619Ω

VCC

BAT

EN

C/5

CHRG

LTC4061-4.4

TIMER ACPR

PROG

IDET

NTC

GND

800mA

+ 4.4V

SINGLE-CELL

Li-Ion BATTERY*

*SANYO BATTERIES:

UF553436T OR

UF553450T

40614.4 TA01a

Complete Charge Cycle (1100mAh Battery)

900

4.5

800

4.4

700

4.3

600 BATTERY

VOLTAGE

500

400

300

4.2

4.1

BATTERY

CURRENT

4.0

3.9

200

100 VCC = 5V

TA = 25°C

0

0

0.5 1.0 1.5 2.0

TIME (HOURS)

3.8

3.7

3.6

2.5

40614.4 TA01b

406144fb

1

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