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A4001 Datasheet(PDF) 9 Page - AIT Components Ltd.

Part No. A4001
Description  BATTERY MANAGEMENT
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Manufacturer  AITCOMPONENTS [AIT Components Ltd.]
Direct Link  http://aitcomponents.com
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A4001 Datasheet(HTML) 9 Page - AIT Components Ltd.

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AiT Semiconductor Inc.
www.ait-ic.com
A4001
BATTERY MANAGEMENT
ONE CELL LITHIUM-ION/POLYMER BATTERY PROTECTION IC
REV1.0
- JUN 2014 RELEASED -
- 9 -
DETAILED INFORMATION
Normal Condition
This IC monitors the voltage of the battery connected between the VCC pin and GND pin and the voltage
difference between the CS pin and GND pin to control charging and discharging.
When the battery voltage is in the range from overdischarge detection voltage (VODP) to overcharge
detection voltage (VOCP), and the CS pin voltage is in the range from the charger detection voltage (VCH) to
discharge overcurrent detection voltage (VOI1), the IC turns both the charging and discharging control
MOSFET on. This condition is called the normal status. Under this condition, charging and discharging can
both be carried out freely.
Caution: Discharging may not be enacted when the battery is first time connected. To regain normal status,
CS and GND pin must be shorted or the charger must be connected.
Overcharge Protection
When the voltage of the battery cell exceeds the overcharge protection voltage (VOCP) beyond the
overcharge delay time (TOC) period, charging is inhibited by turning off of the charge control MOSFET. The
overcharge condition is released in two cases:
(1) The voltage of the battery cell becomes lower than the overcharge release voltage (VOCR) through
self-discharge.
(2) The voltage of the battery cell falls below the overcharge protection voltage (VOCP) and a load is
connected.
When the battery voltage is above VOCP, the overcharge condition will not release even a load is connected
to the pack.
Overdischarge Status
Products with Power-down Function
When the battery voltage falls below than the overdischarge detection voltage (VODR) during discharging in
the normal status and the detection continues longer than the overdischarge detection delay time (TOD), the
A4001 series will turn the discharging control MOSFET off(OD pin) so as to stop discharging. This condition is
called the overdischarge status.
When the MOSFET is off, CS pin voltage is pulled up by the resistor to VCC in the IC, at this time; the power
consumption is reduced to the lowest. This condition is called the SLEEP MODE .
The overdischarge status will be released by two cases:
(1) When CS pin voltage is equal to or lower than the charge overcurrent detection voltage (VCIP) by
charging and the VCC pin voltage is higher than the overdischarge detection voltage (VODR).


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