S-8244AAAFN-CEAT2G Seiko Instruments, S-8244AAAFN-CEAT2G Datasheet - Page 13

• Manufacturer Part Number: S-8244AAAFN-CEAT2G
• Description: IC LI-ION BATT PROTECT 8-MSOP
• Manufacturer: Seiko Instruments

Specifications of S-8244AAAFN-CEAT2G

• Function: Over/Under Voltage Protection
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 3.6 V ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Product: Li-Ion Protection
• Output Voltage: 4.45 V
• Operating Supply Voltage: 3.6 V to 24 V
• Supply Current: 3 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Rev.6.0
Operation
BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
1. Overcharge Detection
2. Delay Circuit
Remark Refer to “
• Product with CMOS output active “H”, Nch open drain output active “H”
• Product with CMOS output active “L”, Nch open drain output active “L”, Pch open drain output active “L”
During charging in the normal status, any of battery voltages exceeds overcharge detection voltage (V
status is maintained for overcharge detection delay time (t
Connecting an FET to the CO pin enables charge-control and the second protect.
In this case, the IC maintains the overcharge status until all battery voltages decreases, to the overcharge
hysteresis voltage (V
During charging in the normal status, any of battery voltages exceeds overcharge detection voltage (V
status is maintained for overcharge detection delay time (t
Connecting an FET to the CO pin enables charge-control and the second protect.
In this case, the IC maintains the overcharge status until all battery voltages decreases, to the overcharge
hysteresis voltage (V
The delay circuit rapidly charges the capacitor connected to the delay capacitor connection pin up to a specified
voltage when the voltage of one of the batteries exceeds the overcharge detection voltage (V
circuit gradually discharges the capacitor at 100 nA and inverts the CO output when the voltage at the delay
capacitor connection pin goes below a specified level. Overcharge detection delay time (t
upon the external capacitor.
Each delay time is calculated using the following equation.
Because the delay capacitor is rapidly charged, the smaller the capacitance, the larger the difference between the
maximum voltage and the specified value of delay capacitor pin (ICT pin). This will cause a deviation between the
calculated delay time and the resultant delay time. Also, delay time is internally set in this IC to prevent the CO
output from inverting until the charge to delay capacitor pin is reached to the specified voltage.
capacitance is used, output may be enabled without delay time because charge is disabled within the internal delay
time.
Please note that the maximum capacitance connected to the delay capacitor pin (ICT pin) is 1 μ F.
_00
t
CU
[s] = Delay Coefficient (10,
Battery Protection IC Connection Example ”.
CD
CD
) from the overcharge detection voltage (V
) from the overcharge detection voltage (V
Min.
Seiko Instruments Inc.
Typ.
15,
Max.
20) × C
CU
ICT
CU
) or longer, CO gets “H”. This is overcharge status.
) or longer, CO gets “L”. This is overcharge status.
[ μ F]
CU
CU
).
).
CU
CU
S-8244 Series
). Then, the delay
) varies depending
CU
CU
), and this
), and this
If large
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