PRELIMINARY
Li-Ion BATTERY PROTECTOR
鈥?9.12.9
R5422NxxxC/xxxE series
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OUTLINE
The R5422NxxxC/E Series are protection ICs 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 ICs 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 a value higher than V
DET1
, the output of C
OUT
pin, the output of over-charge detector/VD1, switches to low level, charger's negative pin level after the delay time by setting an
external capacitor. After detecting over-charge the VD1 can be reset and the output of C
OUT
becomes high when the V
DD
voltage
is coming down to a level lower than 鈥淰
REL1
鈥? or when a kind of loading is connected to V
DD
after a charger is disconnected from
the battery pack while the V
DD
level is in between 鈥淰
DET1
鈥?and 鈥淰
REL1
鈥?in the R5422NxxxC/E version.
The output of D
OUT
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 to a value lower than V
DET2
.
After R5422NxxxC/E Series detect the over-discharge voltage, connect a charger to the battery pack, and when the battery
supply voltage becomes higher than the over-discharge detector threshold, VD2 is released and the voltage of D
OUT
becomes
鈥淗鈥?level.
An excess load current can be sensed and cut off after internally fixed delay time passed through the built in excess current
detector, VD3, with D
OUT
being enabled to low level. Once after detecting excess current, the VD3 is released and D
OUT
level
switches to high by detaching a battery pack from a load system.
Further, short circuit protector makes D
OUT
level to low immediately with external short circuit current and removing external
short circuit leads D
OUT
level to high. After detecting over-discharge, supply current will be kept extremely low by halt some
internal circuits operation. Output type of C
OUT
and D
OUT
is CMOS. 6-pin, SOT23-6 is available.
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FEATURES
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High Voltage Process Technology
Absolute Maximum Rating of Voltage level between V
DD
-V- 28v
Low supply current....................................................Supply current
Typ. 6.0碌A(chǔ)
Standby current (detecting over-discharge)
Typ. 0.1碌A(chǔ)
High accuracy detector threshold ..............................Over-charge detector (Topt=25擄C)
鹵25mV
(Topt=0 to 50擄C)
鹵30 mV
Over-discharge detector
鹵2.5%
Excess current detector
鹵20mV
Variety of detector threshold .....................................Over-charge detector threshold
4.0V - 4.5V step of 0.01V
Over-discharge detector threshold
2.0V - 3.0V step of 0.01V
Built-in protection circuit ..........................................Excess current protection
0.05V - 0.4V step of 0.01V
Output delay of over-charge ......................................Time delay at C=0.01碌F tV
DET1
=75ms, tV
REL1
=20ms
Output delay of over-discharge .................................Internally fixed TYP. 17ms
Output delay of excess-current
Internally fixed TYP. 10ms
2 Over-current modes
Excess Current Mode / Short Mode
Charging Available / non-available at 0V Cell
Acceptable of 0V Cell
C version
Non-acceptable of 0V Cell E versi on
Small package............................................................SOT-23-6 / 6-pin
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APPLICATIONS
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Li+ one-cell protector for battery pack
Rev. 0.01
-1-
1
2
3
4
5
6
7
8
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