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LTC4090EDJC-5-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC4090EDJC-5-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 28 page LTC4090/LTC4090-5 9 4090fa PIN FUNCTIONS SYNC (Pin 1): External Clock Synchronization Input. See synchronizing section in the Applications Information section. Ground pin when not used. PG (Pin 2): The PG pin is the open collector output of an internal comparator. PG remains low until the HVOUT pin is above 2.8V. PG output is valid when HVIN is above 3.6V and HVEN is high. RT (Pin 3): Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the switching frequency. VC (Pin 4): High Voltage Buck Regulator Control Pin. The voltage on this pin controls the peak switch current in the high voltage regulator. Tie an RC network from this pin to ground to compensate the control loop. NTC (Pin 5): Input to the NTC Thermistor Monitoring Circuits. The NTC pin connects to a negative temperature coefficient thermistor which is typically co-packaged with the battery pack to determine if the battery is too hot or too cold to charge. If the battery temperature is out of range, charging is paused until the battery temperature re-enters the valid range. A low drift bias resistor is required from VNTC to NTC and a thermistor is required from NTC to ground. If the NTC function is not desired, the NTC pin should be grounded. VNTC (Pin 6): Output Bias Voltage for NTC. A resistor from this pin to the NTC pin will bias the NTC thermistor. ⎯H⎯V⎯P⎯R (Pin 7): High Voltage Present Output (Active Low). A low on this pin indicates that the high voltage regulator has sufficient voltage to charge the battery. This feature is enabled if power is present on HVIN, IN, or BAT (i.e., above UVLO thresholds). ⎯C⎯H⎯R⎯G(Pin8):Open-DrainChargeStatusOutput.Whenthe battery is being charged, the ⎯C⎯H⎯R⎯G pin is pulled low by an internal N-channel MOSFET. When the timer runs out or the charge current drops below 10% of the programmed charge current or the input supply is removed, the ⎯C⎯H⎯R⎯G pin is forced to a high impedance state. PROG (Pin 9): Charge Current Program Pin. Connecting a resistor from PROG to ground programs the charge current: IA V R CHG PROG () , = 50 000 GATE (Pin 10): External Ideal Diode Gate Connection. This pin controls the gate of an optional external P-channel MOSFET transistor used to supplement the internal ideal diode. The source of the P-channel MOSFET should be connected to OUT and the drain should be connected to BAT. When not in use, this pin should be left floating. It is important to maintain high impedance on this pin and minimize all leakage paths. BAT (Pin 11): Single-Cell Li-Ion Battery. This pin is used as an output when charging the battery and as an input when supplying power to OUT. When the OUT pin potential drops below the BAT pin potential, an ideal diode function connects BAT to OUT and prevents OUT from dropping more than 100mV below BAT. A precision internal resistor divider sets the final float (charging) potential on this pin. The internal resistor divider is disconnected when IN and HVIN are in undervoltage lockout. IN (Pin 12): Input Supply. Connect to USB supply, VBUS. Input current to this pin is limited to either 20% or 100% of the current programmed by the CLPROG pin as deter- mined by the state of the HPWR pin. Charge current (to the BAT pin) supplied through the input is set to the current programmed by the PROG pin but will be limited by the input current limit if charge current is set greater than the input current limit or if the sum of charge current plus load current is greater than the input current limit. OUT (Pin 13): Voltage Output. This pin is used to provide controlled power to a USB device from either USB VBUS (IN), an external high voltage supply (HVIN), or the battery (BAT) when no other supply is present. The high voltage supply is prioritized over the USB VBUS input. OUT should be bypassed with at least 4.7μF to GND. |
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