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LTC3550EDHC Datasheet(PDF) 10 Page - Linear Technology |
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LTC3550EDHC Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LTC3550 10 3550fa PI FU CTIO S USBIN (Pin 1): USB Input Supply Pin. Provides power to the battery charger. The maximum supply current is 650mA. This should be bypassed with a 1µF capacitor. IUSB (Pin 2): USB Charge Current Program and Monitor Pin. The charge current can be set by connecting a resis- tor, 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 charge current delivered from the USB input using the following formula: I V R BAT IUSB IUSB = • 1000 ITERM (Pin 3): Termination Current Threshold Program Pin. The current termination threshold, ITERMINATE, can be set by connecting a resistor, RITERM, to ground. ITERMINATE is set by the following formula: I V R TERMINATE ITERM = 100 When the charge 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. Driv- ing 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 sufficient to begin charging (i.e., when the supply is greater than the undervoltage 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. The 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 LTC3550 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. VFB (Pin 6): Voltage Feedback Pin. Receives the feedback voltage from an external resistor divider across the buck regulator output. VCC (Pin 7): Buck Regulator Input Supply Pin. Must be closely decoupled to GND (Pins 8, 9) with a 2.2µF or greater ceramic capacitor. GND (Pins 8, 9): Ground. SW (Pin 10): Buck Regulator Switch Node Connection to Inductor. This pin connects to the drains of the internal main (top) and synchronous (bottom) power MOSFET switches. RUN (Pin 11): Buck Regulator Run Control Input. Forcing this pin above 1.5V enables the regulator. Forcing this pin below 0.3V shuts it down. In shutdown, all buck regulator functions are disabled drawing <1µA supply current from VCC. Do not leave RUN floating. EN (Pin 12): Charger Enable Input. A logic low on this pin enables the charger. If this input is left floating, an internal 2M Ω pull-down resistor defaults the LTC3550 to charge mode. Pull this pin high to disable the charger. HPWR (Pin 13): USB High/Low Power Mode Select 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 2M Ω pull-down resistor defaults the charger to its low current state. IDC (Pin 14): Wall Adapter Charge Current Program and Monitor Pin. The charge current is set by connecting a resistor, 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 charge current using the following formula: I V R BAT IDC IDC = • 1000 BAT (Pin 15): Charger Output. This pin provides charge current to the battery and regulates the final float voltage to 4.2V. |
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