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LTC4063

4063fc

pin FuncTions

BAT(Pin1): Charger Output and Regulator Input. This pin

provides charge current to the battery and regulates the

final float voltage to 4.2V. This pin also supplies power to

the LDO regulator.

OUT(Pin2): LDO Regulator Output. This pin should be

bypassed with a ≥2µF low ESR capacitor as close to the

pin as possible for best performance. The minimum VOUT

is 1.2V.

FB(Pin3): Regulator Feedback Input. The voltage on this

pin is compared to the internal reference voltage (800mV)

by the error amplifier to keep the output voltage in regula-

tion. An external resistor divider between OUT and FB sets

the output voltage.

LDOEN(Pin4): LDO Enable Input. A logic high on the

LDOENpinshutsdowntheLDO.Inthisstate,OUTbecomes

high impedance and the battery drain current drops to

less than 5µA. A logic low on the LDOEN pin enables the

LDO regulator. A 2M pull-down resistor defaults the LDO

to its enabled state.

CHGEN(Pin5): Charger Enable Input. A logic high on the

CHGENpinplacesthechargerintoshutdownmode,where

the ICC quiescent current is less than 65µA. A logic low on

this pin enables battery charging. A 2M pull-down resistor

to ground defaults the charger to its enabled state.

CHRG (Pin 6): Open-Drain Charge Status Output. The

charge status indicator pin has two states: pull-down

and high impedance. This output can be used as a logic

interface or an LED driver. In the pull-down state, an

NMOS transistor capable of sinking 10mA pulls down on

the CHRG pin. The state of this pin is dependent on the

value of IDETECT as well as the termination method being

used. See Applications Information.

TIMER(Pin7):TimerProgramandTerminationSelectPin.

This pin selects which method is used to terminate the

charge cycle. Connecting a capacitor, CTIMER, to ground

selects Charge Time termination. The charge time is set

by the following formula:

Time Hours

Hours

µF

TIMER

(

)

•

0 1

me Hours

Hours

(

)

(

)

Connecting the pin to ground selects Charge Current

termination, while connecting the pin to VCC selects User

termination. See Applications Information.

IDET(Pin8): Current Detection Threshold Program Pin.

The current detection threshold, IDETECT, is set by con-

necting a resistor, RDET, to ground. IDETECT is set by the

following formula:

DETECT

PROG

DET

CHG

DET

100

•

TTECT

The CHRG pin becomes high impedance when the charge

current drops below IDETECT. IDETECT can be set to 1/10th

theprogrammedchargecurrentbyconnectingIDETdirectly

to PROG. See Applications Information.

This pin is clamped to approximately 2.4V. Driving this

pin to voltages beyond the clamp voltage can draw large

currents and should be avoided.

PROG(Pin9): Charge Current Program and Charge Cur-

rent Monitor. The charge current is set by connecting a

resistor, RPROG, to ground. When charging in constant

current mode, this pin servos to 1V. The voltage on this

pin can be used to measure the charge current using the

following formula:

BAT

PROG

• 1000

VCC(Pin10): Positive Input Supply Pin. Provides power

to the battery charger. This pin should be bypassed with

a 1µF capacitor.

GND(ExposedPadPin11): Ground. This pin is the back

of the Exposed Pad package and must be soldered to the

PCB copper for minimal thermal resistance.

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