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LTC4095EDC Datasheet(PDF) 10 Page - Linear Technology |
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LTC4095EDC Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC4095 10 4095fa OPERATION Figure 2. State Diagram of LTC4095 Operation NTC Thermistor The battery temperature is measured by placing a nega- tive temperature coefficient (NTC) thermistor close to the battery pack. The NTC circuitry is shown in Figure 3. To use this feature, connect the NTC thermistor, RNTC, between the NTC pin and ground, and a bias resistor, RNOM, from IN to NTC. RNOM should be a 1% resistor with a value equal to the value of the chosen NTC thermistor at 25°C (R25). A 100k thermistor is recommended since thermistor current is not measured by the LTC4095 and its current will have to be considered for compliance with USB specifications. The LTC4095 will pause charging when the resistance of the NTC thermistor drops to 0.54 times the value of R25 or approximately 54k (for a Vishay “Curve 1” thermistor, this corresponds to approximately 40°C). If the battery charger is in constant voltage mode, the safety timer will pause until the thermistor indicates a return to a valid temperature. As the temperature drops, the resistance of the NTC therm- istor rises. The LTC4095 is also designed to pause charging when the value of the NTC thermistor increases to 3.25 times the value of R25. For a Vishay “Curve 1” thermistor, this resistance, 325k, corresponds to approximately 0°C. The hot and cold comparators each have approximately 3°C of hysteresis to prevent oscillation about the trip point. Grounding the NTC pin disables all NTC functionality. IF SUSP < 0.4V AND IN > 4V AND IN > BAT + 165mV DUVLO, UVLO AND SUSPEND SUSPEND/SHUTDOWN MODE 1/10 FULL CHARGE CURRENT CHRG STRONG PULL-DOWN 30 MINUTE TIMER BEGINS TRICKLE CHARGE MODE FULL CHARGE CURRENT CHRG STRONG PULL-DOWN CONSTANT CURRENT MODE BATTERY CHARGING SUSPENDED CHRG PULSES NTC FAULT NO CHARGE CURRENT CHRG PULSES DEFECTIVE BATTERY 4 HOUR TERMINATION TIMER BEGINS BAT DROPS BELOW 0.105V 4 HOUR TERMINATION TIMER RESETS CONSTANT VOLTAGE MODE NO CHARGE CURRENT CHRG HIGH IMPEDANCE STANDBY MODE CHRG HIGH IMPEDANCE BAT > 2.9V 4095 F02 NO FAULT, BAT ≤ 2.9V 30 MINUTE TIMEOUT 4 HOUR CHARGE CYCLE BEGINS 2.9V < BAT < 4.105V TRUE 4 HOUR TIMEOUT NO FAULT FAULT FALSE POWER ON |
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