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 

LTC4052-4.2

BLOCK DIAGRA

45mV

VIN 3

+

BAT

–

GND 4

TIMER 5

OSCILLATOR

CHRG 6

40µA

ACPR

2

100ms SLEEP

IMAX

FILTER

CHARGE

PUMP

TRIPLER

TRICKLE FAST

CLK

VMIN

STOP

C/10

LOGIC

+

TIMERS

VRECHRG

VFLOAT

1–05m+V

VIN

24mA

10mΩ

1 SENSE

7 GATE

8 BAT

THERMAL

SHUTDOWN

TEMP

REFERENCE

1.23V

VMAX

1.23V

U

OPERATIO

The LTC4052 is a complete lithium-ion battery pulse

charger with an internal 0.35Ω N-MOSFET switch driven

by an internal charge pump. The charge current is set by

the current limit of the input supply (wall adapter). An

external RSENSE sets the maximum allowable charge

overcurrent and prevents a wall adapter with the wrong

current limit from damaging the battery. If the current limit

of the input supply is above IMAX, the charger will imme-

diately terminate charging and will retry after 640ms

(CTIMER = 0.1µF). If the battery is disconnected while in

4

4052 BD

fast charge mode, the charge pump will be turned off when

the voltage at the BAT pin rises above 4.7V and turned back

on when the voltage drops below the float voltage.

A charge cycle begins when the voltage at the VIN pin rises

above the BAT pin by 45mV. The charger will go into trickle

charge mode if the battery voltage is below 2.45V. The

trickle charge current is preset to 24mA and is provided by

an internal current source. In trickle mode, both the pass

transistor and charge pump are off.

405242i

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