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LTC4075HVXEDD Datasheet(PDF) 7 Page - Linear Technology |
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LTC4075HVXEDD Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page LTC4075HVX 7 4075hvxf PIN FUNCTIONS USBIN (Pin 1): USB Input Supply Pin. This input provides power to the battery charger assuming a voltage greater than VUVUSB and less than VOVUSB is present (typically 3.95V to 6V respectively). However, the DCIN input will take priority if a voltage greater than VUVDC and less than VOVDC is present at DCIN (typically 4.15V to 6V respectively). The USBIN input allows charge currents up to 850mA. This pin should be bypassed with a 1μF capacitor. IUSB (Pin 2): Charge Current Program for USB Power. The charge current is set by connecting a resistor, RIUSB, to ground. When charging in constant-current mode, this pin servos to 1V. The voltage on this pin can be used to measure the battery current delivered from the USB input using the following formula: I V R BAT IUSB IUSB = • 1000 ITERM (Pin 3): 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. This pin is internally clamped to approxi- mately 1.5V. Driving this pin to voltages beyond the clamp voltage should be avoided. ⎯P⎯W⎯R (Pin 4): Open-Drain Power Supply Status Output. When the DCIN or USBIN pin voltage is valid to begin charg- ing (i.e. when the supply is greater than the undervoltage lockout threshold, less than the overvoltage lockout thresh- old and at least 120mV above the battery terminal), the ⎯P⎯W⎯R pin is pulled low by an internal N-channel MOSFET. Otherwise ⎯P⎯W⎯R is high impedance. This output is capable of driving an LED (see Table 1 for more detail). ⎯C⎯H⎯R⎯G (Pin 5): Open-Drain Charge Status Output. When the LTC4075HVX is charging, the ⎯C⎯H⎯R⎯G pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, ⎯C⎯H⎯R⎯G becomes high impedance. This output is capable of driving an LED. ENABLE (Pin 6): Enable Input. When the LTC4075HVX is charging from the DCIN source, a logic low on this pin enables the charger. When the LTC4075HVX is charging from the USBIN source, a logic high on this pin enables the charger. If this input is left floating, an internal 2MΩ pull-down resistor defaults the LTC4075HVX to charge when a wall adapter is applied and to shut down if only the USB source is applied. USBPWR (Pin 7): Open-Drain USB Power Status Output. When the voltage on the USBIN pin is sufficient to begin charging and there is insufficient power at DCIN, the USB- PWR pin is high impedance. In all other cases, this pin is pulled low by an internal N-channel MOSFET, provided that there is power present at either DCIN, USBIN, or BAT inputs. This output is capable of driving an LED. IDC (Pin 8): Charge Current Program for Wall Adapter Power. The charge current is set by connecting a resis- tor, RIDC, to ground. When charging in constant-current mode, this pin servos to 1V. The voltage on this pin can be used to measure the battery current delivered from the DC input using the following formula: I V R BAT IDC IDC = • 1000 BAT (Pin 9): Battery Charger Output. This pin provides charge current to the battery and regulates the final float voltage to 4.2V. DCIN (Pin 10): Wall Adapter Input Supply Pin. This input provides power to the battery charger assuming a voltage greater than VUVDC and less than VOVDC is present (typi- cally 4.15V to 6V respectively). A valid voltage on the DCIN input will always take priority over the USBIN input. The DCIN input allows charge currents up to 950mA. This pin should be bypassed with a 1μF capacitor. Exposed Pad (Pin 11): GND. The exposed backside of the package is ground and must be soldered to PC board ground for electrical connection and maximum heat transfer. |
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