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PDF EC9522T Data sheet ( Hoja de datos )
| Número de pieza | EC9522T | |
| Descripción | LI-ION PROTECTION IC | |
| Fabricantes | E-CMOS | |
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LI-ION PROTECTION IC
EC9522T
Ver2.4 2004 / 05
Features
Low supply current
Supply current
TYP. 3.5uA
Standby current (after detecting over-discharge) TYP. 0.25uA
High accuracy detector
Over-charge detector(Topt=25ºC)
+/- 50mV
Threshold
Over-charge detector (Topt=0 to 50ºC)
+/- 60mV
Over-discharge detector
+/- 3.0%
Variety of detector threshold Over-charge detector threshold
4.0V to 4.4V step of 0.005V
Over-discharge detector threshold 2.0V to 3.0V step of 0.005V
Built in protection circuit
Excess current protection
0.04V to 0.32V step of 0.04V
Accuracy
±20%
Output delay of over charge Time delay at VDD=4.3V
1.2S note1
Output delay of over-discharg
VDD=2.4V with built-in capacitor
10mS
Small package
SOT23-6/6-pin
Note1: The result was measured from EC9522T0001
Part Number Examples
Part No.
Over charge detection
voltage
EC9522T003
…*note2
4.30V
….
Note2: New model version and specific
characteristics may be order by customer.
Over charge release
voltage
4.10V
….
marking
E21-
Pack type
SOT-23-6
….
General Description
The EC9522T is protection IC for over-charge/discharge of rechargeable one-cell
Lithium-ion(Li+) excess load current, further include a short circuit protector for preventing large
external short circuit current.
Each of these IC is composed of three voltage detectors, a reference unit, a delay circuit, a
short circuit protector, and a logic circuit. When charging voltage crosses the detector threshold
from a low value to value higher than VDET1, the output of Cout pin, the output of over-charge
detector/VD1, switches to low level, charger’s negative pin level. After detecting over-charge the
VD1 can be reset and the output of Cout becomes high when the VDD voltage is coming down to a
level lower than “VREL1”, or when a kind of loading is connected to VDD after a charger is
disconnected from the battery pack while the VDD level is in between “VDET1” and “VREL1” in
the EC9522T.
The output of Dout pin, the output of over-discharge detector/VD2, switches to low level after
internally fixed delay time passed, when discharging voltage crosses the detector threshold from a
high value lower than VDET2. After EC9522T detect the over-discharge voltage, connect a charger
Page 1 of 8
1 page  
LI-ION PROTECTION IC
EC9522T
Ver2.4 2004 / 05
OPERATION
VD1/Over-Charge Detector
The VD1 monitors VDD pin voltage. When the VDD voltage crosses over charge detector
threshold VDET1 from a low value to a value higher than the VDET1, the VD1 can sense a
over-charging and an external charge control Nch-MOS-FET turns to “OFF” with Cout pin being at
“L” level.
There can be two cases to reset the VD1 making the Cout pin level to “H” again after detecting
over-charge. Resetting the VD1 can make charging system allowable to resumption of charging
process. The first case is in such conditions that a time when the VDD voltage is coming down to a
level lower than “VREL1”. While in the second case, connecting a kind of loading to VDD after
disconnecting a charger from the battery pack can make the VD1 resetting when the VDD level is
in between “VDET1” and “VREL1”.
After detecting over-charge with the VDD voltage of higher than VDET1, connecting system load
to the battery pack makes load current allowable through parasitic diode of external charge control
FET. The Cout level would be high when the VDD level is coming down to a level below the
VDET1 by continuous drawing of load current.
An output delay time for over-charge detection can be set by external capacitor C3 connecting
between the Vss pin and Ct pin. The external capacitor can make a delay time from a moment
detecting over-charge to a time output a signal which enables charge control FET turn off.
When the VDD level is going up to a higher level than VDET1 if the VDD voltage would be back
to a level lower than the VDET1 within a time period of the output delay time, VD1 would not
output a signal for turning off the charge control FET.
A level shifter incorporated in a buffer driver for the Cout pin makes the “L” level of Cout pin to
the V- pin voltage and the “H” level of Cout pin is set to VDD voltage with CMOS buffer
VD2/Over-Discharge Detector
The VD2 is monitoring a VDD pin voltage. When the VDD voltage crosses the over-discharge
detector threshold VDET2 from a high value to a value lower than the VDET2, the VD2 can sense
an over-discharging and the external discharge control Nch MOSFT turns to “OFF” with the Dout
pin being at “L” level.
To reset the VD2 with the Dout pin level being “H” again after detecting over-discharge it is
necessary to connect a charger to the battery pack for EC9522T. When the VDD voltage stays
under over-discharge detector threshold VDET2 charge current can flow through parasitic diode of
external discharge control MOSFET, then after the VDD voltage comes up to a value larger than
VDET2, Dout becomes “H” and discharging process would be able to advance through ON state
MOSFET for discharge control.
Connecting a charger to the battery pack makes the Dout level being “H” instantaneously when the
VDD voltage is higher than VDET2.
Besides, for EC9522T, when a cell voltage reaches equal or more than over-discharge released
voltage, or VDET2, over-discharge condition can be also released.
Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet EC9522T.PDF ] | |
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