LTC4063



4063fc

Typical applicaTion

FeaTures

DescripTion

Standalone Linear Li-Ion

Charger with Micropower

Low Dropout Linear Regulator

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 cur-

rent. 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 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 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 35µA and

the battery drain current to less than 2µA.

Other features include smart recharge, undervoltage

lockout, LDO current limiting and a charge status pin to

indicate when the charge cycle has completed.

L

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

SmartStart, ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All

other trademarks are the property of their respective owners. Protected by U.S. Patents

including 6522118.

applicaTions

n

ChargeCurrentProgrammableupto1A

n

Integrated100mAAdjustableLowDropoutLinear

Regulator

n

ChargesSingleCellLi-IonBatteriesDirectlyfrom

USBPort

n

PresetChargeVoltagewith±0.35%Accuracy

n

NoExternalMOSFET,SenseResistororBlocking

DiodeNeeded

n

ThermalRegulationMaximizesChargeRate

withoutRiskofOverheating

n

AdjustableLDOOutputVoltageRange:

1.2Vto4.2V

n

Programmable Charge Termination Timer

n

Programmable Charge Current Detection/Termination

n

SmartStart™ Prolongs Battery Life

n

Charge Status Output

n

35µA Charger Quiescent Current in Shutdown

n

15µA LDO Quiescent Current

n

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

(3mm

× 3mm) DFN Package

n

Handheld Computers

n

Portable MP3 Players

n

Digital Cameras

SingleCellLi-IonBatteryChargerwithRegulated3VOutput

(C/10Termination)

CompleteChargeCycle(900mAhBattery)

+

TIMER

PROG

IDET

BAT

OUT

FB

LTC4063

GND

440k

700mA

160k

715

2.2µF

1µF

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