AP9211

Document number: DS37596 Rev. 2 - 2

2 of 17

www.diodes.com

December 2015

© Diodes Incorporated

AP9211

U1

AP9211

(U-DFN2030-6)

BAT

P+

C1

100n

R2

2.7kohm

P-

VDD

VSS

S1

S2

VM

1

2

3

5

6

R1

330ohm to 470ohm

Note: 4. R1 and C1 are used to stabilize the supply voltage of the AP9211

. The recommended range of R1 value is 330Ω to 470Ω and C1 value is

charge/discharge current. The R2 should be between 300

Ω 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

4k

Ω resistor, charge may not be off due to the voltage drop on R2.

For power down mode, when first connecting AP9211 system board to the battery, it is necessary to use charger or to short P- to the

battery negative polarity. Once the AP9211 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

Negative power supply pin

3

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

4

NC

Not connected, leave this pin floating

5

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.