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LM3641 Scheda tecnica(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM3641
Spiegazioni elettronici  Lithium-Ion Battery Pack Protection Circuit
Download  16 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3641 Scheda tecnica(HTML) 9 Page - National Semiconductor (TI)

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Product Description (Continued)
Fail Safe Features
The safety provided by the LM3641 goes beyond the normal
operation of the IC. The design of the IC includes many as-
pects that continue to assure protection of the cells even
when malfunctions occur.
A rugged internal sense resistor offers precise overcur-
rent response (magnitude and time) which allows smaller
volume power MOSFETs to be used. If the internal resis-
tor’s sense circuitry’s input open circuit (very unlikely),
the MOSFET pair will turn OFF. The IC will fail safe.
If any pin becomes detached from the PCB, either the
MOSFETs will turn OFF or the part will continue to protect
the Cell.
The maximum cell voltage limit is trimmed by EEPROM
and offers optimal accuracy. Each EEPROM cell has re-
dundant EEPROM transistors for additional reliability.
The EEPROM register also contains a parity check bit. In
the rare event that an EEPROM bit would change state,
the power MOSFETs will be turned OFF rather than allow
the IC to operate out of specification.
The external MOSFETs are specified to provide ad-
equate illegal charger withstand capability. Because of
M3, the IC is designed to never be exposed to more than
the actual cell voltage. Therefore the IC’s maximum rated
supply voltage does not limit the magnitude of illegal
charger voltages that can be protected by the IC. M3’s Vt
also guarantees that shorted cells can not be charged.
DS012931 13
FIGURE 2. Normal Termination of Discharging
DS012931 14
FIGURE 3. Termination of Illegally High Charging
DS012931 15
FIGURE 4. Load Applied in Overcharged State
www.national.com
9


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