AP9234L Datasheet, PDF (2/14 Pages) Diodes Incorporated – HIGH ACCURACY SINGLE CHIP SOLUTION FOR 1-CELL Li plus BATTERY PACK

Typical Applications Circuit (Note 4)
AP9234L
B+
BAT
R1
330Ω to 470Ω
C1
100nF
VDD
U1
AP9234L
(U-DFN2535-6)
VSS
S1
S2
B-
C3 100nF
(Option)
DS
VM
R2
2.7kΩ
P+
C2
100nF
(Option)
P-
Note: 4. R1 and C1 are used to stabilize the supply voltage of the AP9234L. 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 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 (please contact Diodes Inc. sales team), when first connecting AP9234L system board to the battery, it is necessary to use charger or
to short P- to the battery negative polarity. Once the AP9234L 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
1
2
3
4
5
6
EP
Pin Name
S1
VSS
VDD
DS
VM
S2
D
Function
Source pin of discharging MOSFET, connecting this pin to battery negative pole
Negative power input.
Positive power supply pin, connecting this pin to battery positive pole through R1
Test Pin, leave it open
Charger negative input pin, short this pin to S2 pin through R2
Source pin of charging MOSFET, connecting this pin to charge negative input
Exposed 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
AP9234L
Document number: DS38205 Rev. 1 - 2
2 of 14
www.diodes.com
December 2015
© Diodes Incorporated