lv5113t Sanyo Semiconductor Corporation, lv5113t Datasheet - Page 5

• Manufacturer Part Number: lv5113t
• Description: 2-cell Lithium-ion Secondary Battery Protection Ic
• Manufacturer: Sanyo Semiconductor Corporation

Functional Description
Over-charge detection
Over-charge return
Over-discharge detection
Over-discharge return
Over-current detection
Short circuit detection
Over-current/short-detection return
If either of the cell voltage is equal to or more than the over-charge detection voltage, stop further charging by
turning “L” the Cout pin and turning off external Nch MOS FET after the over-charge detection delay time. This
delay time is set by the internal counter.
The over-charge detection comparator has the hysteresis function. Note that this hysteresis can be cancelled by
connecting the load after detection of over-charge detection.
Once over-charge detection is made, over-current detection is not made to prevent malfunction. Note that short-
circuit can be detected.
If charger is connected and both cell voltages become equal to or lower than the over-charge recovery voltage or
over-charge detection voltage when load is connected, the Cout pin returns to “H” after the over-charge recovery
delay time set by the internal counter.
voltage, the Cout pin does not return to “H.” When the load current is passed through the external Cout pin parasite
diode of Nch MOS FET after the over-charge recovery delay time and each cell voltage becomes equal to or below
over-charge detection voltage, the Cout returns to “H.”
charger detection sequence starts after over-charge recovery.
When either cell voltage is equal to or below over-discharge voltage, stop further discharge by turning “L” the Dout
pin and turning off external Nch MOS FET after the over-charge detection delay time.
The IC becomes standby state after detecting over-discharge and its consumption current is kept at about 0A. After
detection, the V - pin will be connected to V DD pin via 200kΩ.
Return from over-discharge is made by connecting charger. If the V - pin voltage becomes equal to or lower than the
standby return voltage by connecting charger after detecting over-discharge, it returns from the standby state to start
cell voltage monitoring. If both voltages become equal to or more than the over-discharge detection voltage by
charging, the Dout pin returns to “H” after the over-discharge return delay time set by the internal counter.
When high current is passed through the battery, the V potential rises by the ON resister of external MOS FET and
becomes equal to or more than the over-current detection voltage, that will be deemed over-current state. Turn “L”
the Dout pin after the over-current detection delay time and turn off the external Nch MOS FET to prevent high
current in the circuit. The delay time is set by the internal counter. After detection, the V - pin will be connected to
V SS via 30kΩ. It will not go into standby state after detecting over-current.
If greater discharge current is passed and the V - pin voltage becomes equal to or more than the short-circuit detection
voltage, it will go into short-circuit detection state after the short circuit delay time shorter than the over-current
detection delay time. When short-circuit is detected, just like the time of over-current detection, turn Dout pin “L”
and turn off external Nch MOS FET to prevent high current in the circuit. The V - pin will be connected to V SS after
detection via 30kΩ. It will not go into standby state after detecting short-circuit.
After detecting over-current or short circuit, the return resistor (typ.30kΩ) between V - pin and V SS pin becomes
effective and if the resistor is opened the V - pin voltage will be pulled by the V SS pin voltage. Thereafter, the IC will
return from the over-current/short-circuit detection state when the V - pin voltage becomes equal to or below the over-
current detection voltage and the Dout pin returns to “H” after over-current return delay time set by the internal
counter.
When load is connected and either cell or both cell voltages are equal to or more than the over-charge detection
However, high voltage charger is connected as mentioned below, Cout pin does not return to “H” because over-
LV5113T
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