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■OPERATIONAL EXPLANATION (Continued)

<Charge Condition Status>

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

●High impedance: in shutdown mode.

<Connection of Shorted BAT Pin>

by over current.

<Under-voltage Lockout (UVLO)>

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>

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

4.20V

4.05V

2.9V

CC

CV

Trickle

Standby

Recharge Battery Time

(2ms, Typ)

Recharge

Battery

Voltage

Charge

Current

Battery Termination Detect Time

(1ms, Typ)

/CHG Pin

Status

Weak Pull Down

(20uA, Typ)

Strong Pull Down

(10mA, Typ)

Strong Pull Down

(10mA, Typ)