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LTM8061EV-4.1PBF Datasheet(PDF) 7 Page - Linear Technology |
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LTM8061EV-4.1PBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  LTM8061 7 8061f PIN FUNCTIONS GND (Bank 1): Power and Signal Ground Return. BAT (Bank 2): Battery Charge Current Output Bus. The charge function operates to achieve the final float voltage at this pin. The auto-restart feature initiates a new charge cycle when the voltage at the BAT pin falls 2.5% below the float voltage. Once the charge cycle is terminated, the input bias current of the BAT pin is reduced to minimize battery discharge while the charger remains connected. In most applications, connect BIAS to BAT. VINA (Bank 3): Anode of Input Reverse Protection Schottky Diode. Connect the input power here if input voltage protection is desired. VINC/CLP (Bank 4): This pad bank connects to the cathode of the input reverse protection diode. In addition, system current levels can be monitored by connecting a sense resistor from this pin to the VIN pin. Additional system load is drawn from the VIN pin connection, and maximum system load is achieved when VVINC/CLP – VVIN= 50mV. The LTM8061 servos the charge current required to maintain programmed maximum system current. If this function is not desired, connect the VINC/CLP pin to the VIN pin (see the Applications Information section). Do not raise this pin above VIN + 0.5V. VIN (Bank 5): Charger Input Supply. Apply CIN here. Con- nect the input power here if no input power rectification is required. BIAS (Pin G7): The BIAS pin connects to the internal power bus. Connect to a power source greater than 2.5V and less than 10V. In most applications, connect BIAS to BAT. CHRG (Pin K7): Open-Collector Charger Status Output. Typically pulled up through a resistor to a reference volt- age. This status pin can be pulled up to voltages as high as VIN and can sink currents up to 10mA. During a battery charge cycle, CHRG is pulled low. When the charge cycle terminates, the CHRG pin becomes high impedance. If the internal timer is used for termination, the pin stays low during the charge cycle until the charge current drops below a C/10 rate even though the charger will continue to top off the battery until the end-of-charge timer terminates the charge cycle. A temperature fault also causes this pin to be pulled low (see the Applications Information sec- tion). If RUN is low, or the LTM8061 is otherwise powered down, the state of the CHRG pin is invalid. NTC (Pin H6): Battery Temperature Monitor Pin. This pin is the input to the NTC (negative temperature coefficient) thermistor temperature monitoring circuit. This function is enabled by connecting a 10kΩ, β = 3380 NTC thermistor from the NTC pin to ground. The pin sources 50μA, and monitors the voltage across the 10kΩ thermistor. When the voltage on this pin is above 1.36V (T < 0°C) or below 0.29V (T > 40°C), charging is disabled and the CHRG and FAULT pins are both pulled low. If internal timer termina- tion is being used, the timer is paused, suspending the charge cycle. Charging resumes when the voltage on NTC returns to within the 0.29V to 1.36V active region. There is approximately 5°C of temperature hysteresis associated with each of the temperature thresholds. The temperature monitoring function remains enabled while thermistor resistance to ground is less than 250kΩ. If this function is not desired, leave the NTC pin unconnected. |
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