EUP9232
Application Circuit
Figure2.
Symbol
FET1
FET2
R1
C1
R2
C2
R4
C3
R3
Parts
Nch MOSFET
Nch MOS FET
Chip resistor
Chip capacitor
Chip resistor
Chip capacitor
Chip resistor
Chip capacitor
Chip resistor
Purpose
Discharge control
Charge control
ESD protection
Filter
ESD protection
Filter
ESD protection
Delay time setting
Protection for
charger
reverse
connection
Recommend
1kΩ
0.22
µF
1kΩ
0.22
µF
1 kΩ
0.22
µF
1 kΩ
min.
300
Ω
0
µF
300
Ω
0
µF
=
R1 min.
0
µF
300
Ω
max.
1 kΩ
1
µF
1 kΩ
1
µF
=
R1 max.
1
µF
5 kΩ
Remarks
Same value as R1 and R2.
*1
Attention should be paid to
*2
leak current of C3.
Discharge can’t be stopped at
less than 300
Ω
when a charger
is reverse-connected.
*3
*1
R4=R1 is required. Overcharge detection voltage increases by R4. For example 10 kΩ (R4) increases overcharge detection voltage
by 20 mV.
*2
The overcharge detection delay time (t
CU
), the overdischarge detection delay time (t
DD
), and the over current detection delay time
(t
IOV
) change with the external capacitor C3. Refer to the “Electrical
Characteristics”.
*3
When the resistor R3 is set less than 300Ω and a charger is reverse-connected, current which exceeds the power dissipation of the
package will flow and the IC may break.
Caution
1.The above constants may be changed without notice.
2. 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 constant do not guarantee proper
operation. Perform through evaluation using the actual application to set the constant.
DS9232 Ver1.1
Feb. 2007
4
EUTECH [ EUTECH MICROELECTRONICS INC ]
