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LTC4063

4063fb

Standalone Linear Li-Ion

Charger with Micropower

Low Dropout Linear Regulator

Regulator

USB Port

±0.35% Accuracy

Diode Needed

Without Risk of Overheating*

1.2V to 4.2V

µA Charger Quiescent Current in Shutdown

µA LDO Quiescent Current

(3mm

× 3mm) DFN Package

■

Handheld Computers

Single Cell Li-Ion Battery Charger with Regulated 3V Output

(C/10 Termination)

The LTC

lithium-ion batteries with an adjustable low dropout linear

regulator (LDO). The adjustable LDO regulates an output

voltage between 1.2V to 4.2V at up to 100mA load current.

When the input supply (wall adapter or USB supply) is

removed, the LDO regulates the output voltage without

interruption. The battery charger and LDO regulator can be

enabled individually.

No external sense resistor or external blocking diode is

required for charging due to the internal MOSFET architec-

ture. Internal thermal feedback regulates the charge cur-

rent to maintain a constant die temperature during high

power operation or high ambient temperature conditions.

The float voltage is fixed at 4.2V and the charge current is

programmed with an external resistor. Charge termination

methods include minimum charge current or maximum

time. With power applied, the LTC4063 can be put into

shutdown mode to reduce the supply current to 35

µA and

the battery drain current to less than 2

µA.

Other features include smart recharge, undervoltage lock-

out, LDO current limiting and a charge status pin to

indicate when the charge cycle has completed.

Complete Charge Cycle (900mAh Battery)

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

+

TIMER

PROG

IDET

BAT

OUT

FB

LTC4063

GND

440k

700mA

160k

715

Ω

2.2

µF

1

µF

4.3V TO 8V

4063 TA01a

3V

4.2V

SINGLE CELL

Li-Ion BATTERY

TIME (HOURS)

0

400

500

600

2

4063 TA01b

300

200

0

0.50

1

1.50

0.25

2.25

0.75

1.25

1.75

100

800

700

3.75

4.00

4.25

3.50

3.25

2.75

3.00

4.75

4.50

CONSTANT CURRENT

CONSTANT

VOLTAGE

, 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.