HY2120
2-Cell Lithium-ion/Lithium Polymer Battery Packs Protection ICs
10.Battery Protection IC Connection Example
Symbol Device Name
Purpose
Min.
Typ.
Max.
Remark
Resistor
limit current, stabilize VDD and
strengthen ESD protection
100Ω
470Ω
*1
R1
330Ω
.
Resistor
limit current, stabilize VC and
100Ω
470Ω
*1
R2
330Ω
strengthen ESD protection
Resistor
limit current
1 kΩ
4kΩ
*2
*3
*3
*4
*5
R3
C1
C2
M1
M2
2kΩ
Capacitor
Capacitor
N-MOSFET
N-MOSFET
Filter, stabilize VDD
Filter, stabilize VDD
Discharge control
Charge control
0.01μF
1.0μF
0.1μF
0.01μF
1.0μF
0.1μF
-
-
-
-
-
-
*1. If R1 or R2 connects with an over-spec resistor, battery accuracy may be influenced due to R1 or R2
voltage drop that caused by current consumption. When a charger is connected in reversed, the
current flows from the charger to the IC. At this time, if R1 or R2 is too high, the voltage between VDD
pin and VSS pin may exceed the absolute maximum rating.
*2. If R3 connects with an over-spec resistor, the charging current may not be cut off when a
high-voltage charger is connected. Please select as large a resistor as possible to control current
when a charger is connected in reversed.
*3. C1 & C2 can stabilize the supply voltage of VDD, the value of C1 & C2 should be equal to or more
than 0.01μF.
*4. If a MOSFET with a threshold voltage that is the same or more than overdischarge detection voltage
is applied, discharging may be stopped before overdischarge is detected.
*5. If the withstanding voltage between the gate and source is lower than the charger voltage, the FET
may be destroyed.
© 2009-2015 HYCON Technology Corp
www.hycontek.com
DS-HY2120-V15_EN
page10
HYCON [ HYCON Technology Corporation ]
