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LTC4069 Datasheet(PDF) 11 Page - Linear Integrated Systems

Part # LTC4069
Description  Standalone 750mA Li-Ion Battery Charger in 2 2 DFN with NTC Thermistor Input
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LTC4069 Datasheet(HTML) 11 Page - Linear Integrated Systems

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LTC4069
11
4069fc
For more information www.linear.com/LTC4069
operaTion
4069 F03
RNOM
RNTC
VCC
+
TOO COLD
TOO HOT
NTC_ENABLE
0.76 • VCC
0.35 • VCC
0.016 • VCC
6
NTC
Figure 3. NTC Circuit Information
value of the NTC thermistor drops to 0.53 times the value
of RNOM, which corresponds to approximately 40°C, and
when the value of the NTC thermistor increases to 3.26
times the value of RNOM, which corresponds to approx-
imately 0°C. Hold mode freezes the timer and stops the
charge cycle until the thermistor indicates a return to a
valid temperature. For a Vishay NTHS0603N01N1003J
thermistor, this value is 32.6k which corresponds to
approximately 0°C. The hot and cold comparators each
haveapproximately3°Cofhysteresistopreventoscillation
about the trip point.
When the charger is in Hold mode (battery temperature is
either too hot or too cold) the CHRG pin pulses in a 2Hz,
25%dutycyclefrequencyunlessthechargetaskisfinished
or the battery is assumed to be defective. If the NTC pin
is grounded, the NTC function will be disabled.


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