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 

U

OPERATIO

SINGLE CELL +

Li-Ion BATTERY

BAT

OUT

LTC4063

FB

GND

VOUT

R2

COUT

R1

4063 F01

Figure 1. Adjustable Linear Regulator

Figure 1 shows how an external resistor divider sets the

regulator output voltage. The output voltage can be set

LTC4063

anywhere between 1.2V and 4.2V, although the upper limit

is limited by the battery voltage minus the regulator

dropout voltage.

VOUT = 800mV • ⎛⎝⎜1+ RR21⎞⎠⎟

In order to maintain stability under light load conditions,

the maximum recommended value of R1 is 160k.

APPLICATIO S I FOR ATIO

Programming Charge Termination

The LTC4063 terminates a charge cycle using several

methods, allowing the designer considerable flexibility in

choosing an ideal charge termination algorithm. Table 1

shows a brief description of the different termination

methods and their behavior.

Charge Time Termination

Connecting a capacitor (CTIMER) to the TIMER pin enables

the timer and selects Charge Time Termination. The total

charge time is set by:

Time(Hours) = 0.1µF • 3 Hours

CTIMER

When the programmed time has elapsed, the charge cycle

terminates and the charger enters standby mode. Subse-

quent recharge cycles terminate when half the programmed

time has elapsed.

The IDET pin determines the behavior of the CHRG output.

Connecting a resistor (RDET) from the IDET pin to ground

sets the charge current detection threshold, IDETECT:

IDETECT

=

RPROG

10RDET

• ICHG

=

100V

RDET

or

RDET

=

100V

IDETECT

Table 1

METHOD

Charge Time

Termination

TIMER

0.1µF to

GND

IDET

RDET to

GND

CHARGER DESCRIPTION

Charges for 3 Hours. After 3 Hours, the Charger

Stops Charging and Enters Standby Mode.

Recharge Cycles Last for 1.5 Hours

CHRG OUTPUT DESCRIPTION

Pull-Down State While IBAT > IDETECT. High Impedance

State While IBAT < IDETECT or When Charging is Stopped

0.1µF to NC Charges for 3 Hours. After 3 Hours, the Charger Pull-Down State When Charging. High Impedance State

GND

Stops Charging and Enters Standby Mode.

When Charging is Stopped

Recharge Cycles Last for 1.5 Hours

Charge Current

Termination

GND RDET to Charges Until Charge Current Drops Below

GND IDETECT, Then Enters Standby Mode

Pull-Down State When Charging. High Impedance State

When Charging is Stopped

GND

NC Charges Indefinitely Until CHGEN Pin is Pulled Pull-Down State When Charging. High Impedance State

High

When Charging is Stopped

User-Selectable VCC RDET to Charges Indefinitely Until CHGEN Pin is Pulled Pull-Down State While IBAT > IDETECT. High Impedance

Charge

GND High. SmartStart is Disabled

State While IBAT < IDETECT or When Charging is Stopped

Termination

VCC

NC Charges Indefinitely Until CHGEN Pin is Pulled Pull-Down State When Charging. High Impedance State

High. SmartStart is Disabled

When Charging is Stopped

4063fb

11

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