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PDF R5438L Data sheet ( Hoja de datos )
| Número de pieza | R5438L | |
| Descripción | Li-ION/POLYMER 1/2/3-CELL PROTECTOR Second protection IC | |
| Fabricantes | RICOH electronics devices division | |
| Logotipo |  |
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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
1 page  
PIN CONFIGURATIONS
DFN1814-6
654
R5437/R5438L
123
PIN DESCRIPTION
R5437
Pin No.
1
2
3
4
5
6
Symbol
VC1
VC2
VSS
VC3
VDD
COUT
Description
Positive terminal pin for Cell-1
Positive terminal pin for Cell-2
VSS pin. Ground pin for the IC
Positive terminal Pin for Cell-3
VDD Pin
Output pin of over-charge detection
R5438
Pin No.
1
2
3
4
5
6
Symbol
COUT
VDD
VC1
VC2
VC3
VSS
Description
Output pin of over-charge detection
VDD Pin
Positive terminal pin for Cell-1
Positive terminal pin for Cell-2
Positive terminal Pin for Cell-3
VSS pin. Ground pin for the IC
5
5 Page 
R5437/R5438L
OPERATION
• VDET1n / Over-Charge Detectors (n=1, 2, 3)
While the cells are charged, the voltage between VC1 pin and VC2 pin (voltage of the Cell-1), the voltage between
VC2 pin and VC3 pin (voltage of the Cell-2), and the voltage between VC3 pin and Vss pin (voltage of the Cell-3) are
supervised. If at least one of the cells’ voltage becomes equal or more than the over-charge detector threshold,
the over-charge is detected, and an external charge control Nch MOSFET turns on with COUT pin being at "H"
level and by cutting a fuse on the charger path, and charge stops.
To reset the over-charge and make the COUT pin level to "L" again after detecting over-charge, in such conditions
that a time when all the cells’ voltages are down to a level lower than over-charge released voltage.
Internal fixed output delay times for over-charge detection and release from over-charge exist. Even if one of
voltage of the cells keeps its level more than the over-charge detector threshold, and output delay time passes,
over-charge voltage is detected. After detecting over-charge, even if all the cell voltages become equal or less
than the released voltage from over-charge, if at least one of the cells voltage becomes higher than the released
voltage from over-charge within the output delay time of the release from over-charge, then over-charge is not
released.
The output type of the COUT pin is CMOS output between VSS and the built-in regulator, and "H" level of COUT
pin is the output voltage of the built-in regulator. (Typ. 4.7V)
• Shutdown Function
The voltage between VC1 pin and VC2 pin (the voltage of Cell-1), the voltage between VC2 pin and VC3 pin (Cell-
2 voltage), and the voltage between VC3 pin and VSS pin (Cell-3 voltage) are supervised. 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. (Max. 0.1μA)
After detecting shutdown, at least one of the cell voltages becomes equal or more than the shutdown detector
threshold, the shutdown state is released.
• DS (Delay Shortening) Function
By applying the voltage of 4V±0.2V to VDD-VC1, over-charge delay time can be shortened to about 1/90 and
released delay time can be shortened to about 1/60.
• 1-cell/ 2-cell/ 3-cell protection alternative
When the IC should be used as a 1-cell protection IC, connect short VC1 pin – VC2 pin and VC3 pin - VSS pin.
When the IC should be used as a 2-cell protection IC, connect short VC1 pin – VC2 pin or VC3 pin - VSS pin.
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet R5438L.PDF ] | |
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