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LTC4097 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4097 Datasheet(HTML) 8 Page - Linear Technology |
8 / 20 page LTC4097 8 4097f PIN FUNCTIONS DCIN (Pin 1): Wall Adapter Input Supply Pin. Provides power to the battery charger. The maximum supply current is 1.2A. This pin should be bypassed with a 1µF capacitor. USBIN (Pin 2): USB Input Supply Pin. Provides power to the battery charger. The maximum supply current is 1A. This pin should be bypassed with a 1µF capacitor. VNTC (Pin 3): Output Bias Voltage for NTC. A resistor from this pin to the NTC pin sets up the bias for an NTC thermistor. When the DCIN or USBIN pin voltage is sufficient to begin charging (i.e. when the DCIN or USBIN supply is greater than the undervoltage lockout thresholds and at least 100mV or 150mV, respectively, above the battery terminal), the VNTC pin is connected to the appropriate input through an internal P-channel MOSFET. If sufficient voltage to charge is not present on DCIN or USBIN the VNTC pin is high impedance. This output can source up to 120mA. ⎯C⎯H⎯R⎯G (Pin 4): Open-Drain Charge Status Output. When the LTC4097 is charging, the ⎯C⎯H⎯R⎯G pin is pulled low by an internal N-channel MOSFET. When the charge cycle is com- pleted, ⎯C⎯H⎯R⎯G becomes high impedance. This output can sink up to 10mA, making it suitable for driving a LED. SUSP (Pin 5): Charge Enable Input. A logic low on this pin enables the charger. If left floating, an internal 3.4MΩ pull-down resistor defaults the LTC4097 to charge mode. Pull this pin high for shutdown. NTC (Pin 6): Input to the NTC (Negative Temperature Coefficient) Thermistor Temperature Monitoring Circuit. For normal operation, connect a thermistor from the NTC pin to ground and a resistor of equal value from the NTC pin to VNTC. When the voltage at this pin drops below 0.349 • VNTC at hot temperatures or rises above 0.765 • VNTC at cold, charging is suspended and the ⎯C⎯H⎯R⎯G pin output will keep the state in which it was be- fore the event (low-Z or high-Z). Pulling this pin below 0.017 • VNTC disables the NTC feature. There is approxi- mately 2°C of temperature hysteresis associated with each of the input comparator’s thresholds. HPWR (Pin 7): HPWR Enable Input. Used to control the amount of current drawn from the USB port. A logic high on the HPWR pin sets the charge current to 100% of the current programmed by the IUSB pin. A logic low on the HPWR pin sets the charge current to 20% of the current programmed by the IUSB pin. An internal 3.4MΩ pull-down resistor defaults the HPWR pin to its low current state. ITERM (Pin 8): Charge Termination Current Threshold Program. The termination current threshold, ITERMINATE, is set by connecting a resistor, RITERM, to ground. ITERMINATE is set by the following formula: I V R TERMINATE ITERM = 100 When the battery current, IBAT, falls below the termination threshold, charging stops and the ⎯C⎯H⎯R⎯G output becomes high impedance. |
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