LTC4063 查看數據表（PDF） - Linear Technology

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LTC4063

Standalone Linear Li-Ion Charger with Micropower Low Dropout Linear Regulator

Linear Technology 

LTC4063

Standalone Linear Li-Ion

Charger with Micropower

Low Dropout Linear Regulator

FEATURES

■ Charge Current Programmable up to 1A

■ Integrated 100mA Adjustable Low Dropout Linear

Regulator

■ Charges Single Cell Li-Ion Batteries Directly from

USB Port

■ Preset Charge Voltage with ±0.35% Accuracy

■ No External MOSFET, Sense Resistor or Blocking

Diode Needed

■ Thermal Regulation Maximizes Charge Rate

Without Risk of Overheating*

■ Adjustable LDO Output Voltage Range:

1.2V to 4.2V

■ Programmable Charge Termination Timer

■ Programmable Charge Current Detection/Termination

■ SmartStartTM Prolongs Battery Life

■ Charge Status Output

■ 35µA Charger Quiescent Current in Shutdown

■ 15µA LDO Quiescent Current

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

(3mm × 3mm) DFN Package

U

APPLICATIO S

■ Handheld Computers

■ Portable MP3 Players

■ Digital Cameras

DESCRIPTIO

The LTC®4063 is a standalone linear charger for single cell

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 35µA and

the battery drain current to less than 2µA.

Other features include smart recharge, undervoltage lock-

out, LDO current limiting and a charge status pin to

indicate when the charge cycle has completed.

, 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

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

(C/10 Termination)

VIN

4.3V TO 8V

1µF

715Ω

VCC

BAT

LTC4063

OUT

TIMER

PROG

FB

IDET

GND

700mA

VOUT

3V

440k

+ 4.2V

SINGLE CELL

2.2µF

Li-Ion BATTERY

160k

4063 TA01a

Complete Charge Cycle (900mAh Battery)

800

CONSTANT CURRENT

700

600

4.75

CONSTANT

4.50

VOLTAGE

4.25

500

4.00

400

3.75

300

3.50

200

3.25

100 VCC = 5V

3.00

TA = 25°C

0

2.75

0 0.25 0.50 0.75 1 1.25 1.50 1.75 2 2.25

TIME (HOURS)

4063 TA01b

4063fb

1

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