AP9221

Document number: DS42177 Rev. 3 - 2

2 of 16

www.diodes.com

May 2021

© Diodes Incorporated

AP9221

Typical Applications Circuit (Note 4)

U1

AP9221

(U-DFN2030-6

(Type C))

BAT

P+

C1

100n

R2

2.7k

Ω

P-

VDD

VSS

S1

S2

VM

1

2

3

5

6

R1

330

Ω to 470Ω

Note:

4. R1 and C1 are used to stabilize the supply voltage of the AP9221. The recommended range of the R1 value is 330Ω to 470Ω and C1 value is 10nF to

1000nF, typical value is 100nF. R2 should be connected between P- to VM sense terminal to monitor the status of charger and the charge/discharge

current. The R2 should be between 300Ω and 4kΩ, typical value is 2.7kΩ. R1 and R2 are also used as current limit resistors if the battery or charger is

connected reversely. Polarity reversing may cause the power consumption of R1 and R2 to go over their power dissipation rating, therefore R1 and R2

values should be selected appropriately for the actual application. If R2 is more than 4kΩ resistor, charge may not be off due to the voltage drop on R2.

For power down mode, when first connecting AP9221 system board to the battery, it is necessary to use charger or to short P- to the battery negative

polarity. Once the AP9221 is activated, the charger or connection can be removed, otherwise the battery cannot discharge current through system board.

The values selected should follow the recommended typical range mentioned above. It has not been confirmed whether the operation is normal or not in

circuits other than the above example of connection. In addition, the example of connection shown above and the typical value do not exactly guarantee

proper operation. Please perform the actual application to set the suitable value through your complete evaluation.

Pin Descriptions

Pin Number

Pin Name

Function

1

S1

Source pin of discharging MOSFET, connecting this pin to battery negative pole.

2

VSS

Negative power supply pin

3

VDD

Positive power supply pin, connecting this pin to battery positive pole through R1

4

NC

Not connected, leave this pin floating

5

VM

Charger negative input pin, short this pin to S2 pin through R2

6

S2

Source pin of charging MOSFET, connecting this pin to charge negative input.

EP

D

Thermal PAD is common drain of charge and discharge MOSFET, so in PCB layout, prefer to use

large copper area to cover this pad for better thermal dissipation, then leave it open.