R5478N128EC Datasheet PDF - RICOH
| Part Number | R5478N128EC | |
| Description | Li-ION/POLYMER 1CELL PROTECTOR | |
| Manufacturers | RICOH | |
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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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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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| Information | Total 27 Pages | |
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