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LTC3417AIFE-1-PBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3417AIFE-1-PBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LTC3417A-1 6 3417a1fa (DFN/TSSOP) RUN1 (Pin 1/Pin 2): Enable for 1.5A Regulator. When at Logic 1, 1.5A regulator is running. When at 0V, 1.5A regulator is off. When both RUN1 and RUN2 are at 0V, the part is in shutdown. VIN1 (Pin 2/Pin 3): Supply Pin for P-Channel Switch of 1.5A Regulator. ITH1 (Pin 3/Pin 4): Error Amplifier Compensation Point for 1.5A Regulator. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 1.5V. VFB1 (Pin 4/Pin 5): Receives the feedback voltage from external resistive divider across the 1.5A regulator output. Nominal voltage for this pin is 0.8V. VFB2 (Pin 5/Pin 6): Receives the feedback voltage from external resistive divider across the 1A regulator output. Nominal voltage for this pin is 0.8V. ITH2 (Pin 6/Pin 7): Error Amplifier Compensation Point for 1A regulator. The current comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0V to 1.5V. RUN2 (Pin 7/Pin 8): Enable for 1A Regulator. When at Logic 1, 1A regulator is running. When at 0V, 1A regula- tor is off. When both RUN1 and RUN2 are at 0V, the part is in shutdown. VIN2 (Pin 8/Pin 9): Supply Pin for P-Channel Switch of 1A Regulator and Supply for Analog Circuitry. SYNC/MODE (Pin 9/Pin 12): Combination Mode Selection and Oscillator Synchronization Pin. This pin controls the op- eration of the device. When the voltage on the SYNC/MODE pin is >(VIN – 0.5V), Burst Mode operation is selected. When the voltage on the SYNC/MODE pin is <0.5V, pulse skipping mode is selected. When the SYNC/MODE pin is held at VIN/2, forced continuous mode is selected. The oscillation frequency can be synchronized to an external oscillator applied to this pin. When synchronized to an external clock, pulse skip mode is selected. SW2 (Pin 10/Pin 13): Switch Node Connection to the Inductor for the 1A Regulator. This pin swings from VIN2 to PGND2. POR (Pin 11/Pin 14): The Power-On-Reset Pin. This open drain-logic output is pulled to GND when the output voltage of either regulator falls 8% below regulation and goes high approximately 150ms after both regulators are above –6% of regulation. If either RUN1 or RUN2 is low (the respective regulator is in sleep mode and therefore the output voltage is low), then POR reflects the regulation of the running regulator. FREQ (Pin 12/Pin 15): Frequency Set Pin. When FREQ is at VIN, internal oscillator runs at 1.5MHz. When a resistor is connected from this pin to ground, the internal oscillator frequency can be varied from 0.6MHz to 4MHz. GNDA (Pin 13/Pin 16): Analog Ground Pin for Internal Analog Circuitry. PIN FUNCTIONS TYPICAL PERFORMANCE CHARACTERISTICS RDS(ON) vs VIN OUT2 Frequency vs VIN Frequency vs Temperature VIN (V) 2 0.18 0.19 0.20 3.5 4.5 3417A-1 G16 0.17 0.16 2.5 3 4 5 5.5 0.15 0.14 TA = 27°C P-CHANNEL SWITCH N-CHANNEL SWITCH VIN (V) 2 0 2 4 5 5.5 3417A-1 G17 –4 –10 2.5 3 3.5 4 4.5 6 –2 –6 –8 FREQ = 143k TO GROUND FREQ = VIN TEMPERATURE (°C) –50 5 10 15 25 75 3417A-1 G18 0 –5 –25 0 50 100 125 –10 –15 FREQ = 143k TO GROUND FREQ = VIN |
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