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R5438L Schematic ( PDF Datasheet ) - RICOH electronics devices division

Teilenummer R5438L
Beschreibung Li-ION/POLYMER 1/2/3-CELL PROTECTOR Second protection IC
Hersteller RICOH electronics devices division
Logo RICOH electronics devices division Logo 




Gesamt 21 Seiten
R5438L Datasheet, Funktion
R5437/R5438L
Li-ION/POLYMER 1/2/3-CELL PROTECTOR Second protection IC
NO.EA-324-140808
OUTLINES
R5437/R5438 Series are CMOS-based high voltage tolerant over-charge protection ICs for Li-ion/Li-polymer
secondary battery. The R5437/R5438 can detect overcharge of 1-cell to 3-cell Li-ion/ Li-polymer batteries. The
R5437/R5438 is consists of 3 voltage detectors, a voltage reference unit, an internal voltage regulator, an
oscillator, a counter, a delay circuit, a logic circuit.
When the over-charge is detected, after the IC internally fixed delay time, the output of COUT becomes "H".
After detecting over-charge, when the cell voltage becomes lower than the over-charge released voltage, the
over-charge state is released.
If all the cells voltages become equal or less than the shutdown detector threshold, all the circuits are halted
and shut down, as a result, the consumption current of IC itself (Shutdown current) is extremely reduced.
The output type is CMOS.
FEATURES
Manufactured with High Voltage Tolerant Process ...... Absolute Maximum Rating
26V
Low supply current ........................................... Cell voltage 3.9V, for 3-cell
Typ. 0.85µA
High accuracy detector threshold .................... Over-charge detector (Ta=25°C)
±20mV
(Ta=0 to 60°C)
±25mV
Variety of detector threshold
Over-charge detector threshold
4.1V-4.6V step of 0.005V (VDET1n) (n=1, 2, 3)
Over-charge released voltage
VDET1n-0V to VDET1n-0.5V step of 0.05V (VREL1n) (n=1, 2, 3)
Setting of Output delay time............................. Over-charge detector Output Delay options 2, 4, 6s(Built-in delay)
Shutdown Function ............................................When all the cell voltages become equal or less than shutdown
detector threshold, the IC will be into shutdown mode and the consumption current of IC itself becomes extremely small.
Even if one of the cells becomes equal or more than shutdown released voltage, the shutdown mode is released.
Shutdown detector threshold ............................Typ. 3.5V±0.3V
Shutdown Release Hysteresis ..........................none
Shutdown current ..............................................Max. 0.1μA
1/2/3 cell protection enabler..............................By external wiring, 1 or 2 or 3-cell protection can be selected.
Over-charge released condition........................Released by voltage type
COUT output ........................................................COUT: 4.7V regulator power supply CMOS output. Active "H"
Delay Time Shortening Function.......................By applying the voltage of 4V±0.2V to VDD-VC1, over-charge
and released delay time can be shortened to 1/90.
Small package.................................................. DFN1814-6
1






R5438L Datasheet, Funktion
R5437/R5438L
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
VDD Supply voltage
VC1
VC2
VC3
VCOUT
PD
Ta
Tstg
Input voltage
Positive input pin voltage for Cell-1
Positive input pin voltage for Cell-2
Positive input pin voltage for Cell-3
Output voltage
COUT pin voltage
Power dissipation
Operating temperature range
Storage temperature range
Ta=25°C, VSS=0V
Ratings
Unit
VC1 -0.3 to VC1+6.5
VC1 -0.3 to 26
V
VC2 -0.3 to VC2+6.5
VC3 –0.3 to VC3+6.5
–0.3 to 6.5
-0.3 to VOH1+0.3
150
-40 to 85
-55 to 125
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.
6

6 Page









R5438L pdf, datenblatt
R5437/R5438L
TIMING CHART
Over-charge operation
VCELL1
VDET11
VREL11
Connect Charger
VCELL2
VDET12
VREL12
VCELL3
VDET13
VREL13
COUT
VR
VSS
Charge/Discharge
Current
Charge
Current
0
Discharge
Current
tVDET1
Connect Load
t
t
tVREL1
tVDET1
t
tVREL1
t
t
12

12 Page





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