)

k

*

k

K

(

R

)

K

*

K

K

(

*

R

)

K

K

(

*

R

*

R

2

R

2

1

2

tl

2

1

1

th

1

2

th

tl

−

−

−

−

=

Where

resistances of thermistors are specified by the thermistor

manufacturer. If the temperature monitoring func�on is not

desired, there's an easy method to connect TEMP pin to

GND to disable this func�on.

Increase the heat regulating current

Reduce the voltage drop across the internal MOSFET can

significantly reduce the power consump�on of the IC.

During thermal regula�on, this has an increased current

supplied to the ba�ery. One strategy is accomplished by an

external element (e.g., a resistor or a diode) will be part of

the power consump�on.

Example: FC9056 is powered by a 5v AC adapter, it charge to

one with a 3.75V voltage lithium-ion ba�ery, and set the

full-scale charge current 800mA by programming. Assuming

the charging current is approximately:

Increase the voltage across the resistor in series with a 5V

AC adapter(Figure 3), the on-chip power dissipa�on can be

reduced, thereby increasing the heat regula�ng current:

Figure 3: One kind of maximizing charge current thermal

regula�on circuit mode

CC

A

can be full scale output 800mA charging current at higher

ambient temperatures.

Although this applica�on can deliver more energy to the

ba�ery in heat regula�ng mode and shorten the charging

�me, But in voltage mode, if VCC becomes low enough

leaving FC9056 state at low voltage drop, It is actually

possible to extend the charging �me. Figure 4 shows how

When in order to maintain a smaller component size and to

technology can play a role in the best. Keep in mind: you

should select a sufficient power handling capability resistor.

Figure 4: Charging current rela�onship with the RCC curve

Automatic restart

Once the charge cycle is terminated, FC9056 immediately

adopt a comparator with 1.8ms filter �me con�nuously

monitor the BAT pin voltage. When the ba�ery voltage

drops below 4.05V or less (Generally corresponding to the

ba�ery capacity from 80 to 90%), charging cycle restart.

This ensures that the battery is maintained at (or near) a

full charge state, and eliminates the periodic need to

1A Stand alone Linear Li-Ion Battery Charger with Thermal Regulation

2018. 05. 15

7/9

Revision No : 0

FC9056