LTC4052-42 데이터 시트보기 (PDF) - Linear Integrated System

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LTC4052-42

Lithium-Ion Battery Pulse Charger with Overcurrent Protection

Linear Integrated System 

FEATURES

s Complete Standalone Pulse Charger for 1-Cell

Lithium-Ion Batteries

s Requires No Microcontroller

s Internal 0.35Ω NMOS Switch

s Sense Resistor Limits Maximum Current for Safety

s Programmable Charge Termination Timer for

Maximum Capacity Charging

s No Blocking Diode Required

s 1% Float Voltage Accuracy

s Near End-of-Charge (C/10) Detection Output

s Low Battery Drain when Input Supply Is Removed

s Automatic Trickle Charge for Low Battery

s Automatic Battery Refresh

s Thermal Shutdown Protection

s Small 8-Pin Thermally Enhanced MSOP Package

U

APPLICATIO S

s Standalone Lithium-Ion Battery Charger

s Personal Information Appliances

s Cellular Telephones

s Cradle Chargers

Final Electrical Specifications

LTC4052-4.2

Lithium-Ion Battery

Pulse Charger with

Overcurrent Protection

DESCRIPTIO

July 2002

The LTC®4052 is a complete standalone pulse charger

with integrated MOSFET for 1-cell lithium-ion batteries.

An external sense resistor provides maximum charge

current limiting as a safety precaution against a user

connecting a wall adapter with the incorrect or no current

limit. The internal MOSFET prevents reverse battery

current from flowing if the input voltage is shorted to

ground, eliminating the need for a blocking diode.

As the battery accepts charge and approaches the

programmed float voltage, the internal MOSFET begins

switching off and on with the duty cycle gradually decreas-

ing as the battery approaches a fully charged condition.

A programmable timer ends the charge cycle. The near

end-of-charge C/10 condition is indicated at the CHRG pin

when the average charge current falls to one-tenth of the

wallpack current. Removing the input voltage puts the

LTC4052 into a sleep mode, dropping the battery current

drain to less than 1µA (maximum).

The LTC4052 is available in a tiny 8-pin thermally

enhanced MSOP package.

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

TYPICAL APPLICATIO

Single Cell 4.2V, 1A, Standalone Li-Ion Battery Charger

VIN = 4.5V TO 10V

WITH 1A

CURRENT LIMIT

4.7Ω

1k

1µF

1k

VIN

LTC4052

10k

0.047µF

RSENSE

0.05Ω

CHARGE STATUS

AC PRESENT

CHRG

GATE

0.022µF

ACPR

TIMER

SENSE

BAT

GND

CTIMER

0.1µF

1-CELL 4.2V

Li-Ion

BATTERY

4052 TA01

LTC4052 Charge Profile

4.5

4.0

3.5

3.0

CONSTANT

CURRENT

1.0

CHARGE

CYCLE

ENDS

PULSING

CURRENT

0.5

0

C/10

5

0

0 0.5 1.0 1.5 2.0 2.5 3.0

TIME (HOURS)

4052 • TA01b

405242i

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

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