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LTC4069 Datasheet(PDF) 11 Page - Linear Integrated Systems |
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LTC4069 Datasheet(HTML) 11 Page - Linear Integrated Systems |
11 / 18 page 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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