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參數(shù)資料
| 型號： | AIC1802 |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Two-Cell Lithium-Ion Battery Protection IC |
| 中文描述： | 雙鋰離子電池保護IC |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 132K |
| 代理商： | AIC1802 |
AIC1802
7
n
APPLICATION INFORMATIONS
THE OPERATION
Overcharge Protection
When the voltage of either of the battery cells
exceeds V
OCP
(overcharge protection voltage)
beyond the overcharge delay time period,
charging is inhibited by the turning-off of the
charge control MOSFET M2. The overcharge
delay time (T
OC
) defaults to 25mS and can be
extended by adding a capacitor C
TC
. Inhibition of
charging is immediately released when the
voltage of the overcharged cell becomes lower
than V
OCR
(overcharge release voltage) through
discharge.
Overdischarge Protection
When the voltage of either of the battery cells
goes below V
ODP
(overdischarge protection
voltage) beyond the overdischarge delay time
period, discharging is inhibited by the turning-off
of the discharge control MOSFET M1. The
overdischarge delay time (T
OD
) defaults to 25mS
and can be extended by adding a capacitor C
TD
.
Inhibition of discharging is immediately released
when the voltage of the overdischarged cell
becomes higher than V
ODR
(overdischarge
release voltage) through charging.
Power-Down after Overdischarge
When overdischarge occurs, the AIC1802 will go
into power-down mode, turning off all the timing
generation and detection circuitry to reduce the
quiescent current to 0.8
μ
A (V
CC
=4.8V). In the
unusual case where one battery cell is
overdischarged while the other under overcharge
condition, the AIC1802 will turn off all the
detection circuits except the overcharge detection
circuit for the cell under overcharge condition.
Charge Detection after Overdischarge
When overcharge occurs, the discharge control
MOSFET M1 turns off and discharging is inhibited.
However, charging is still permitted through the
parasitic diode of M1. Once the charger is
connected to the battery pack, the AIC1802
immediately turns on all the timing generation and
detection circuitry and goes into normal mode.
Charging is determined to be in progress if the
voltage between CS and GND is below –0.4V
(charge detection threshold voltage V
CH
)
Overcurrent Protection
In normal mode, the AIC1802 continuously
monitors the discharge current by sensing the
voltage of CS pin. If the voltage of CS pin
exceeds V
OIP
(overcurrent protection voltage)
beyond overcurrent delay time T
OI
period, the
overcurrent protection circuit operates and
discharging is inhibited by turning-off of the
discharge control MOSFET M1. Discharging must
be inhibited for at least 256mS after overcurrent
takes place to avoid damage to external control
MOSFETs due to rapidly switching transient
between
V
BAT+
and
overcurrent condition returns to the normal mode
when the load is released and the impedance
between the V
BAT+
and V
BAT-
terminals is 10M
or
higher. For the sake of protection of the external
MOSFETs, the larger the CS pin voltage (which
means the larger discharge current) the shorter
V
BAT-
terminals.
The
the overcurrent delay time. The relationship
between voltage of CS pin and overcurrent delay
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