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PDF R5478N185CJ Data sheet ( Hoja de datos )

Número de pieza R5478N185CJ
Descripción Li-ION/POLYMER 1CELL PROTECTOR
Fabricantes RICOH 
Logotipo RICOH Logotipo



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Li-ION/POLYMER 1CELL PROTECTOR
R5475N/R5478N SERIES
No. EA-291-121009
OUTLINE
The R5475N/R5478Nxxxxx Series are high voltage CMOS-based protection ICs for over-charge/discharge of
rechargeable one-cell Lithium-ion (Li+) / Lithium polymer excess load current, further include a short circuit
protector for preventing large external short circuit current and Excess discharge-current.
Each of these ICs is composed of three voltage detectors, a reference unit, a delay circuit, a short circuit
protector, an oscillator, a counter, and a logic circuit. When the over-charge voltage crosses the detector
threshold from a low value to a high value, the output of COUT pin switches to low level after internal fixed delay
time. The conditions to release over-charge detector are different by mask options. In terms of so called “Latch
function” version, after detecting over-charge, the detector can be reset and the output of COUT becomes "H"
when a kind of load is connected to VDD after a charger is disconnected from the battery pack, and the cell
voltage becomes lower than over-charge detector threshold. If a charger is continue to be connected to the
battery pack, even the cell voltage becomes lower than over-charge detector threshold, over-charge state is not
released. On the other hand, in terms of so called, “ Released by voltage level” version, after detecting
over-charge, when the cell voltage reaches the released voltage from over-charge, the output of COUT becomes
“H”
The output of DOUT pin, the output of Over-discharge detector and Excess discharge-current detector,
switches to “L” level after internally fixed delay time, when discharged voltage crosses the detector threshold
from a high value to a value lower than VDET2.
The conditions to release over-discharge detector are also different by mask options. In terms of so called
“Latch function” version, after detecting over-discharge voltage, connect a charger to the battery pack, and
when the battery supply voltage becomes higher than over-discharge detector threshold, VD2 is released and
the voltage of DOUT pin becomes "H" level. On the other hand, in terms of so called “Released by voltage level”
version, in case that the charger is not connected, when the cell voltage becomes equal released voltage from
over-discharge, over-discharge detector is released. In case that a charger is connected, and when the cell
voltage becomes the released voltage from over-discharge, the over-discharge detector is released.
An excess discharge-current and short circuit state can be sensed and cut off through the built in excess
current detector, VD3, with DOUT being enabled to low level. Once after detecting excess discharge-current or
short circuit, the VD3 is released and DOUT level switches to high by detaching a battery pack from a load
system.
After detecting over-discharge, supply current will be kept extremely low by halting internal circuits' op-
eration.
When the output of COUT is “H”, if V- pin level is set at Vss-2V, the delay time of detector can be shortened.
Especially, the delay time of over-charge detector can be reduced into approximately 1/57. Therefore, testing
time of protector circuit board can be reduced. Output type of COUT and DOUT are CMOS. 6-pin, SOT-23-6 is
available.
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R5478N185CJ pdf
R5475N/R5478Nxxxxx
PIN DESCRIPTION
Pin No.
SOT23-5
4
1
5
2
3
SOT23-6
1
2
3
4
5
6
Symbol
DOUT
V-
COUT
NC
VDD
VSS
Description
Output of over-discharge detection, CMOS output
Pin for charger negative input
Output of over-charge detection, CMOS output
No Connection
Power supply pin, the substrate voltage level of the IC.
Vss pin. Ground pin for the IC
ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
V-
VCOUT
VDOUT
PD
Topt
Tstg
Item
Supply voltage
Input Voltage
V- pin
Output voltage
COUT pin
DOUT pin
Power dissipation
Operating temperature range
Storage temperature range
Ratings
-0.3 to 12
VDD -30 to VDD +0.3
VDD -30 to VDD +0.3
VSS -0.3 to VDD +0.3
150
-40 to 85
-55 to 125
VSS=0V
Unit
V
V
V
V
mW
°C
°C
*Note: Exposure to the condition exceeded Absolute Maximum Ratings may cause the permanent
damages and affects the reliability and safety of both device and systems using the device.
The functional operations cannot be guaranteed beyond specified values in the Recommended conditions.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the per-
manent damages and may degrade the life time and safety for both device and system using the device in
the field. The functional operation at or over these absolute maximum ratings is not assured.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate
within the recommended operating conditions. The semiconductor devices cannot operate normally
over the recommended operating conditions, even if when they are used over such conditions by
momentary electronic noise or surge. And the semiconductor devices may receive serious damage
when they continue to operate over the recommended operating conditions.
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R5478N185CJ arduino
R5475N/R5478Nxxxxx
When a cell voltage equals to zero, if the voltage of a charger is equal or more than 0V-charge minimum
voltage (Vst), COUT pin becomes "H" and a system is allowable to charge.
An output delay time for over-discharge detection is fixed internally. When the VDD level is down to a equal or
lower level than VDET2 if the VDD voltage would be back to a level higher than the VDET2 within a time period of the
output delay time, VD2 would not output a signal for turning off the discharge control FET. Output delay time
for release from over-discharge is also set.
After detecting over-discharge by VD2, supply current would be reduced and be into standby by halting
unnecessary circuits and consumption current of IC itself is made as small as possible.
The output type of DOUT pin is CMOS having "H" level of VDD and "L" level of VSS.
VD3 /Excess discharge-current Detector, Short Circuit Protector
Both of the excess current detector and short circuit protection can work when the both of control FETs are
in "ON" state.
When the V- pin voltage is up to a value between the short protection voltage Vshort /VDD and excess dis-
charge-current threshold VDET3, VD3 operates and further soaring of V- pin voltage higher than Vshort makes
the short circuit protector enabled. This leads the external discharge control Nch MOSFET turns off with the
DOUT pin being at "L" level.
An output delay time for the excess discharge-current detector is internally fixed.
A quick recovery of V- pin level from a value between Vshort and VDET3 within the delay time keeps the discharge
control FET staying "H" state. Output delay time for Release from excess discharge-current detection is also
set.
When the short circuit protector is enabled, the DOUT would be "L" and the delay time is also set.
The V - pin has a built-in pull-down resistor to the Vss pin, that is, the resistance to release from ex-
cess-discharge current.
After an excess discharge-current or short circuit protection is detected, removing a cause of excess dis-
charge-current or external short circuit makes an external discharge control FET to an "ON" state automati-
cally with the V- pin level being down to the VSS level through built-in pulled down resistor. The reset resistor of
excess discharge-current is off at normal state. Only when detecting excess discharge-current or short circuit,
the resistor is on.
Output delay time of excess discharge-current is set shorter than the delay time for over-discharge detector.
Therefore, if VDD voltage would be lower than VDET2 at the same time as the excess discharge-current is detected,
the R5478xxxxxx is at excess discharge-current detection mode. By disconnecting a load, VD3 is automatically
released from excess discharge-current.
DS (Delay Shorten) function
Output delay time of over-charge, over-discharge, and release from those detecting modes can be shorter
than those setting value by forcing equal or less than the delay shortening mode voltage to V- pin.
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