LTC4061

1

4061fc

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

TIME (HOURS)

0

0.5

1.5

2.5

3.0

2.0

900

800

700

600

500

400

300

200

100

0

4.3

4.2

4.1

4.0

3.9

3.8

3.7

3.6

3.5

3.4

4061 TA01b

1.0

BATTERY

CURRENT

BATTERY

VOLTAGE

TIMER

PROG

BAT

800mA

4.3V TO 8V

4.2V

SINGLE-CELL

Li-Ion BATTERY

+

619

Ω

1

µF

ACPR

NTC

LTC4061

GND

4061 TA01a

CHRG

EN

C/5

■

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

■

■

20µA Charger Quiescent Current in Shutdown

■

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

(3mm

× 3mm) DFN Package

Standalone Linear Li-Ion Battery

Charger with Thermistor Input

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 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

battery temperature sensing and the SmartStart charg-

ing 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 5µA.

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

rent programming input, undervoltage lockout and AC

Present logic output.

800mA Single-Cell Li-Ion Battery Charger

(C/10 Termination)

Features

■

Handheld Computers

■

Portable MP3 Players

■

Digital Cameras

Complete Charge Cycle (1100mAh Battery)

, 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.