S-8241ACFMC-GCFT2G Seiko Instruments, S-8241ACFMC-GCFT2G Datasheet - Page 20

• Manufacturer Part Number: S-8241ACFMC-GCFT2G
• Description: IC LI-ION BATT PROTECT SOT23-5
• Manufacturer: Seiko Instruments

Specifications of S-8241ACFMC-GCFT2G

• Function: Over/Under Voltage Protection
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-74A, SOT-753
• Product: Li-Ion Protection
• Output Voltage: 4.295 V
• Operating Supply Voltage: 1.5 V to 8 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

20
BATTERY PROTECTION IC FOR 1-CELL PACK
S-8241 Series
4. Overdischarge Status
5. Charger Detection
With power-down function
When the battery voltage drops below the overdischarge detection voltage (V
and it continues for the overdischarge detection delay time (t
off and stops discharging. This status is called overdischarge status. After the discharging control FET is turned off, the
VM pin is pulled up by the R
and VDD drops below 1.3 V (typ.) (the load short-circuiting detection voltage), current consumption of the IC is reduced
to the power-down current consumption (I
shorted by the R
The power-down status is released when a charger is connected and the potential difference between VM and VDD
becomes 1.3 V (typ.) or higher (load short-circuiting detection voltage). At this time, the FET is still off. When the battery
voltage becomes the overdischarge detection voltage (V
normal status from the overdischarge status.
Without power-down function
When the battery voltage drops below the overdischarge detection voltage (V
and it continues for the overdischarge detection delay time (t
off and stops discharging. When the discharging control FET is turned off, the VM pin is pulled up by the R
between VM and VDD in the IC. Meanwhile the potential difference between VM and VDD drops below 1.3 V (typ.) (the
load short-circuiting detection voltage), current consumption of the IC is reduced to the overdischarge current
consumption (I
in the IC under the overdischarge status.
When a charger is connected, the overdischarge status is released in the same way as explained above in respect to
products having the power-down function. For products without the power-down function, in addition, even if the charger
is not connected, the S-8241 turns the discharging control FET on and changes to the normal status from the
overdischarge status provided that the load is disconnected and that the potential difference between VM and VSS
drops below the overcurrent 1 detection voltage (V
VM and VSS in the IC when the battery voltage reaches the overdischarge release voltage (V
If the VM pin voltage is lower than the charger detection voltage (V
connected to a charger, overdischarge hysteresis is released, and when the battery voltage becomes equal to or higher
than the overdischarge detection voltage (V
turned on). This action is called charger detection. (The charger detection reduces the time for charging in which
charging current flows through the internal parasitic diode in the discharging control FET) .
If the VM pin voltage is not lower than the charger detection voltage (V
connected to a charger, the overdischarge status is released (the discharging control FET is turned on) as usual, when
the battery voltage reaches the overdischarge release voltage (V
*1. If the VM pin voltage is no less than the charger detection voltage (V
status is connected to a charger, the overdischarge status is released (the discharging control FET is turned on) as
usual, provided that the battery voltage reaches the overdischarge release voltage (V
OPED
VMD
). This status is called overdischarge status. The VM and VDD pins are shorted by the R
resistor in the IC under the overdischarge and power-down statuses.
VMD
resistor between VM and VDD in the IC. Meanwhile the potential difference between VM
PDN
Seiko Instruments Inc.
DL
). This status is called power-down status. The VM and VDD pins are
), the overdischarge status is released (the discharging control FET is
IOV1
), since the VM pin is pulled down by the R
DL
) or higher
DL
DL
) or longer, the S-8241 turns the discharging control FET
) or longer, the S-8241 turns the discharging control FET
DU
) or higher.
*1
, the S-8241 turns the FET on and changes to the
CHA
CHA
) when a battery in overdischarge status is
CHA
) when a battery in overdischarge status is
DL
DL
), when the battery under overdischarge
) during discharging under normal status
) during discharging under normal status
DU
) or higher.
DU
) or higher.
VMS
resistor between
Rev.9.0
VMD
VMD
resistor
resistor
_00