XC6802 查看數據表（PDF） - TOREX SEMICONDUCTOR

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产品描述 (功能)

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XC6802

800mA Single Cell Li-ion Battery Linear Charger IC

TOREX SEMICONDUCTOR 

XC6802 Series

■OPERATIONAL EXPLANATION (Continued)

Charge

Current

Battery

Voltage

IBAT

IBAT/10

4.20V

4.05V

Trickle

CC

CV

Battery Termination Detect Time

(1ms, Typ)

/CHG Pin

Status

Strong Pull Down

(10mA, Typ)

2.9V

Standby

Weak Pull Down

(20uA, Typ)

Recharge

Recharge Battery Time

(2ms, Typ)

Strong Pull Down

(10mA, Typ)

<Charge Condition Status>

The /CHG pin constantly monitors the charge states classified as below:

●Strong pull-down: I/CHG=10mA (TYP.) in a charge cycle,

●Weak pull-down: I/CHG=20μA (TYP.) in a stand-by mode,

●High impedance: in shutdown mode.

<Connection of Shorted BAT Pin>

Even if the BAT pin is shorted to the VSS, a trickle charge mode starts to operate for protecting the IC from destruction caused

by over current.

<Under-voltage Lockout (UVLO)>

The UVLO circuit keeps the charger in shut-down mode until the input voltage, VIN, rises more than the UVLO voltage.

Moreover, in order to protect the battery charger, the UVLO circuit keeps the charger in shut-down mode when a voltage

between the input pin voltage and BAT pin voltage falls to less than 30mV (TYP.). The charge will not restart until the voltage

between the input pin voltage and BAT pin voltage rises more than 100mV (TYP.). During the shut-down mode, the driver

transistor turns off but a failure detection circuit operates, and supply current is reduced to 10μA (TYP.).

<Soft-start Function>

To protect against inrush current from the input to the battery, soft-start time is set in the circuit optimally (150μs, TYP.).

<Manual Shut-down>

During the charge cycle, the IC can be shifted to the shut-down mode by floating the ISEN pin. For this, a drain current to the

battery is reduced to less than 2μA and a shut-down current of the IC is reduced to less than 10μA (TYP.). A new charge

cycle starts when reconnecting the current sense resistor.

<Opened BAT Pin>

When the BAT pin is left open, the IC needs to be shut-down once after monitoring the CHG pin by a microprocessor etc and

keeping the ISEN pin in H level.

<Backflow Prevention Between the BAT Pin and the VIN Pin>

A backflow prevention circuit protects against current flowing from the BAT pin to the VIN pin even the BAT pin voltage is higher

than the VIN pin voltage.

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