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LTC3550-1 Datasheet(PDF) 10 Page - Linear Technology |
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LTC3550-1 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LTC3550-1 10 35501f 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 LTC3550-1 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. VOUT (Pin 6): Output Voltage Feedback Pin. Receives the feedback voltage from 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): 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. ENABLE (Pin 12): Charger Enable Input. When the LTC3550-1 is charging from the DCIN source, a logic low on this pin enables the charger. When the LTC3550-1 is charging from the USBIN source, a logic high on this pin enables the charger. If this input is left floating, an internal 2MΩ pulldown resistor defaults the LTC3550-1 to charge when a wall adapter is applied and to shut down if only the USB source is applied. USBPWR (Pin 13): 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 USBPWR 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 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 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. |
Similar Part No. - LTC3550-1_15 |
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Similar Description - LTC3550-1_15 |
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