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LTC4076 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4076 Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page LTC4076 7 4076fa USBIN (Pin 1): USB Input Supply Pin. Provides power to thebatterycharger.Themaximumsupplycurrentis650mA. 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 HPWR HIGH I V R BAT IUSB IUSB BAT IUSB = = = • ( ) 1000 IIUSB HPWR LOW • ( ) 200 = 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 CHRG output becomes high impedance. This pin is internally clamped to approximately 1.5V. Driv- ing this pin to voltages beyond the clamp voltage should be avoided. PWR (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 PWR pin is pulled low by an internal N-channel MOSFET. Otherwise PWR is high impedance. This output is capable of sinking up to 10mA, making it suitable for driving an LED. CHRG (Pin 5): Open-Drain Charge Status Output. When the LTC4076 is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, CHRG becomes high impedance. This output is capable of sinking up to 10mA, making it suitable for driving an LED. EN (Pin 6): Charge Enable Input. A logic low on this pin enables the charger. If left floating, an internal 2MΩ pull- down resistor defaults the LTC4076 to charge mode . Pull this pin high for shutdown. 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 2MΩ pull-down resistor defaults the HPWR pin to its low current state. 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. 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 1μF capacitor. Exposed Pad (Pin 11): GND. The exposed backside of the packageisgroundandmustbesolderedtoPCboardground for electrical connection and maximum heat transfer. PI FU CTIO S |
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