LTC4052EMS8E42 Linear Technology Corporation, LTC4052EMS8E42 Datasheet

LTC4052EMS8E42

Manufacturer Part Number

LTC4052EMS8E42

Description

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC4052EMS8E42.pdf (12 pages)

Specifications of LTC4052EMS8E42

Date_code

01+

Current page: 1 of 12
Download datasheet (167Kb)

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

Very Low Power Dissipation: 350mW at 1A

Complete Standalone Pulse Charger for 1-Cell

Lithium-Ion Batteries

Requires No Microcontroller, MOSFET or

Blocking Diode

Sense Resistor Limits Maximum Current for Safety

Programmable Charge Termination Timer for

Maximum Capacity Charging

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

AC Wall Adapter Present Output

Low Battery Drain when Input Supply Is Removed

Automatic Trickle Charge for Low Battery

Automatic Battery Refresh

Thermal Shutdown Protection

Tiny Thermally Enhanced MSOP Package

Handheld Computers

Cellular Telephones

Cradle Chargers

1% Float Voltage Accuracy

CURRENT LIMIT

= 4.5V TO 10V

CHARGE STATUS

AC PRESENT

WITH 1A

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

4.7

1 F

TIMER

0.1 F

CHRG

ACPR

TIMER

LTC4052

SENSE

GND

GATE

BAT

10k

1-CELL 4.2V

Li-Ion

BATTERY

0.047 F

0.022 F

DESCRIPTIO

The LTC

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

An external sense resistor provides overcurrent 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 terminates 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 wall adapter current. Removing the input

voltage puts the LTC4052 into a sleep mode, dropping the

battery current drain to less than 1 A.

The LTC4052 is available in a tiny 8-pin thermally

enhanced MSOP package.

0.05

4052 TA01

SENSE

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

Overcurrent Protection

4052 is a complete standalone pulse charger

Pulse Charger with

Lithium-Ion Battery

4.5

4.0

3.5

3.0

1.0

0.5

CONSTANT

CURRENT

0.5

LTC4052 Charge Profile

1.0

TIME (HOURS)

LTC4052-4.2

C/10

1.5

CURRENT

PULSING

2.0

CHARGE

CYCLE

ENDS

2.5

4052 • TA01b

3.0

405242f

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