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LTC4075 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4075 Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page LTC4075/LTC4075X 7 4075Xfa USBIN (Pin 1): USB Input Supply Pin. Provides power to the battery charger. The maximum supply current is 650mA. 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 approximately 1.5V. Driving this pin to voltages beyond the clamp voltage can draw large currents and should be avoided. ⎯P⎯W⎯R (Pin 4): Open-Drain Power Supply Status Output. When the DCIN or USBIN pin voltage is sufficient to begin charging (i.e. when the supply is greater than the under- voltage lockout threshold and at least 180mV 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 sinking up to 10mA, making it suitable for driving an LED. ⎯C⎯H⎯R⎯G (Pin 5): Open-Drain Charge Status Output. When the LTC4075 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 sinking up to 10mA, making it suitable for driving an LED. ENABLE (Pin 6): Enable Input. When the LTC4075 is charging from the DCIN source, a logic low on this pin enables the charger. When the LTC4075 is charging from the USBIN source, a logic high on this pin enables the charger. If this input is left floating, an internal 2M Ω pulldown resistor defaults the LTC4075 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 the DCIN, USBIN, or BAT inputs. This output is capable of sinking up to 1mA, making it suitable for driving high impedance logic inputs. 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): Charger Output and Regulator Input. 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. Provides power to the battery charger. The maximum supply current is 950mA. This should be bypassed with a 1 μF 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. PI FU CTIO S |
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