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LQH31C Datasheet(PDF) 3 Page - Linear Integrated Systems |
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LQH31C Datasheet(HTML) 3 Page - Linear Integrated Systems |
3 / 8 page 3 LT3463/LT3463A 3463f TYPICAL PERFOR A CE CHARACTERISTICS PI FU CTIO S VOUT1 (Pin 1): Output Voltage Switcher 1. This is the cathode of an internal Schottky diode whose anode is connected to the SW1 pin. SW1 (Pin 2): Switch Pin for Switcher 1. This is the collector of the internal NPN switch. Minimize the metal trace area connected to this pin to minimize EMI. VIN (Pin 3): Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. SW2 (Pin 4): Switch Pin for Switcher 2. This is the collector of the internal NPN switch. Minimize the metal trace area connected to this pin to minimize EMI. D2 (Pin 5): Diode for Switcher 2. This is the anode of an internal Schottky diode whose cathode connected to the GND pin. FB2 (Pin 6): Feedback Pin for Switcher 2. Set the output voltage by selecting values for R3 and R4. VREF (Pin 7): Voltage Reference Pin (1.25V). This pin is used along with FB2 to set the negative output voltage for Switcher 2. SHDN2 (Pin 8): Shutdown Pin for Switcher 2. Pull this pin above 1.5V to enable Switcher 2. Pull below 0.3V to turn it off. Do not leave this pin floating. VCESAT and VDIODE Voltage VREF and VFB1 Voltage VFB2 Voltage Switch Off Time Switch Current Limit Quiescent Current 900 800 700 600 500 400 300 200 100 0 3463 G01 TEMPERATURE ( °C) –50 100 050 –25 25 75 125 IDIODE = 150mA ISWITCH = 150mA FOR BOTH SWITCHERS 1.27 1.26 1.25 1.24 1.23 1.22 3463 G02 TEMPERATURE ( °C) –50 100 050 –25 25 75 125 VREF VFB1 10 8 6 4 2 0 3463 G03 TEMPERATURE ( °C) –50 25 75 –25 0 50 100 125 TEMPERATURE ( °C) –50 100 3463 G04 050 400 350 300 250 200 150 100 50 0 –25 25 75 125 TEMPERATURE ( °C) –50 100 3463 G05 050 450 400 350 300 250 200 150 100 50 0 –25 25 75 125 LT3463 SW1, SW2 LT3463A SW1 LT3463A SW2 TEMPERATURE ( °C) –50 60 50 40 30 20 10 0 25 75 3463 G06 –25 0 50 100 125 NOT SWITCHING VFB1 = 1.3V VFB2 = –0.1V |
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