LTC4061(RevA) Просмотр технического описания (PDF) - Linear Technology

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LTC4061
(Rev.:RevA)

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 Charge Voltage with ±0.35% 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

Standalone Linear Li-Ion Battery

Charger with Thermistor Input

DESCRIPTIO

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

charger for single-cell 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 ⎯C⎯H⎯R⎯G 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 SmartStartTM 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 condi-

tions. The charge current is programmed with an external

resistor. With power applied, the LTC4061 can be put into

shutdown mode to reduce the supply current to 20µA and

the battery drain current to less than 2µA.

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

rent programming input, undervoltage lockout and AC

Present logic.

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

All other trademarks are the property of their respective owners.

SmartStart is a trademark of Linear Technology Corporation.

*Protected by U.S. Patents including 6522118.

TYPICAL APPLICATIO

800mA Single Cell Li-Ion Battery Charger

(C/10 Termination)

VIN

4.3V TO 8V

1µF

619Ω

VCC

BAT

EN LTC4061

C/5

CHRG

TIMER ACPR

PROG

IDET

NTC

GND

800mA

+ 4.2V

SINGLE CELL

Li-Ion BATTERY

4061 TA01a

Complete Charge Cycle (1100mAh Battery)

900

4.3

800

4.2

700

4.1

600

4.0

500

3.9

400

BATTERY

VOLTAGE

BATTERY

CURRENT

3.8

300

3.7

200

100 VCC = 5V

TA = 25°C

0

0 0.5 1.0 1.5 2.0

TIME (HOURS)

3.6

3.5

3.4

2.5 3.0

4061 TA01b

4061fa

1

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