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LTC4061EDD-4.4 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4061EDD-4.4 Datasheet(HTML) 7 Page - Linear Technology |
7 / 20 page LTC4061 4061fd pin FuncTions BAT(Pin1): Charge Current Output. This pin provides charge current to the battery and regulates the final float voltage to 4.2V. NTC(Pin2): Input to the NTC (Negative Temperature Coef- ficient)ThermistorTemperatureMonitoringCircuit.Under normal operation, connect a thermistor from the NTC pin to ground and a resistor of equal value from the NTC pin to VCC. When the voltage at this pin drops below 0.35 • VCC at hot temperatures or rises above 0.76 • VCC at cold, charging is suspended, the internal timer is frozen and the CHRG pin output will start to pulse at 1.5Hz. Pulling this pin below 0.016 • VCC disables the NTC feature. There is approximately 2°C of temperature hysteresis associated with each of the input comparators thresholds. TIMER(Pin3):TimerProgramandTerminationSelectPin. This pin selects which method is used to terminate the charge cycle. Connecting a capacitor, CTIMER, to ground selects charge time termination. The charge time is set by the following formula: TIME HOURS HOURS C µF or C µF TI TIMER TIMER ( ) • . . • = = 3 0 1 0 1 M ME HOURS HOURS ( ) ( ) 3 Connecting the TIMER pin to ground selects charge cur- rent termination, while connecting the pin to VCC selects user termination. See Applications Information for more information on current and user termination. ACPR(Pin4): Open-Drain Power Supply Present Status Output. The power supply status indicator pin has two states: pull-down and high impedance. This output can be used as a logic interface or as a LED driver. In the pull-down state, an NMOS transistor capable of sinking 10mA pulls down on the ACPR pin. The state of this pin is dependent on the value of VCC and BAT: it requires that VCC is 190mV greater than VBAT and greater than VUVLO. See Applications Information. CHRG (Pin 5): Open-Drain Charge Status Output. The charge status indicator pin has three states: pull-down, pulse at 1.5Hz or 6Hz and high impedance. This output can be used as a logic interface or as a LED driver. In the pull-down state, an NMOS transistor capable of sinking 10mA pulls down on the CHRG pin. The state of this pin depends on the value of IDETECT as well as the termina- tion method being used and the state of the NTC pin. See Applications Information. C/5(Pin6): C/5 Enable Input. Used to control the amount of current drawn from the USB port. A logic high on the C/5 pin sets the current limit to 100% of the current programmed by the PROG pin. A logic low on the C/5 pin sets the current limit to 20% of the current programmed by the PROG pin. An internal 3M Ω pull-down resistor defaults the C/5 pin to its low current state. EN(Pin7):ChargerEnableInput.Alogichighonthe ENpin places the charger into shutdown mode, where the input quiescent current is less than 50µA. A logic low on this pin enables charging. An internal 3M Ω pull-down resistor to ground defaults the charger to its enabled state. IDET(Pin8): Current Detection Threshold Program Pin. The current detection threshold, IDETECT, is set by con- necting a resistor, RDETECT, to ground. IDETECT is set by the following formula: I R R I V R or R V I DETECT PROG DET CHG DET DET DE = = = 10 100 100 • TTECT The CHRG pin becomes high impedance when the charge current drops below IDETECT. IDETECT can be set to 1/10th the programmed charge current by connecting IDET di- rectly to PROG. If the IDET pin is not connected, the CHRG output remains in its pull-down state until the charge time elapses and terminates the charge cycle. See Applications Information. Thispinisclampedtoapproximately2.4V.Drivingthispinto voltages beyond the clamp voltage should be avoided. PROG(Pin9): Charge Current Program and Charge Cur- rent Monitor. The charge current is set by connecting a |
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