AP9101C

Document number: DS37771 Rev. 3 - 2

2 of 18

www.diodes.com

December 2015

© Diodes Incorporated

AP9101C

AP9101C

VDD

VSS

DO

CO

VM

Battery

R1

330Ω to 470Ω

C1

100nF

Q1

Q2

R2

2.7KΩ

P+

P-

2(5)

3(6)

1(2)

4(1)

5(3)

A(B)

A for SOT25

B for SOT26

Note: 4. R1 and C1 are used to stabilize the supply voltage of the AP9101C. The recommended range of 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 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, CO may not cut off Q2 due to the voltage drop on R2.

For power down mode, when first connecting AP9101C system board to the battery, it is necessary to use charger or to short P- to the battery negative polarity.

Once the AP9101C 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.

Pin Descriptions

Pin Number

Pin Name

Function

SOT25

SOT26

1

2

Charger Negative Input Pin

2

5

Positive Power Input Pin

3

6

Negative Power Input Pin

4

1

DO

FET Gate Control Pin for Discharge

5

3

CO

FET Gate Control Pin for charge

—

4

NC

No Connected