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LCQF Datasheet(PDF) 7 Page - Linear Technology |
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LCQF Datasheet(HTML) 7 Page - Linear Technology |
7 / 24 page LT3498 7 3498f BLOCK DIAGRAM PIN FUNCTIONS VOUT2 (Pin 7): Drain of Output Disconnect PMOS. Place a bypass capacitor from this pin to GND. See the Applications Information section. CAP2 (Pin 8): Output of the OLED Driver. This pin is connected to the cathode of the internal Schottky diode. Place a bypass capacitor from this pin to GND. SW2 (Pin 9): Switch Pin. This is the collector of the in- ternal NPN power switch. Minimize the metal trace area connected to this pin to minimize EMI. VIN (Pin 10): Input Supply Pin. Must be locally by- passed. SW1 (Pin 11): Switch Pin. Connect the inductor of the white LED driver at this pin. Minimize metal trace area at this pin to minimize EMI. CAP1 (Pin 12): Output of the White LED Driver. This pin is connected to the cathode of the internal Schottky. Connect the output capacitor to this pin and the sense resistor from this pin to the LED1 pin. Exposed Pad (Pin 13): Ground. The Exposed Pad must be soldered to the PCB. – + – + + – + – + – + + 6 5 1 Σ 12 8 7 11 10 9 4 2 3 RAMP GENERATOR 2.3MHz OSCILLATOR SWITCH CONTROL START-UP CONTROL A2 VREF R S Q OVERVOLTAGE PROTECTION DISCONNECT CONTROL SHUNT CONTROL 3498 BD DRIVER DRIVER COMPARATOR SW2 CAP1 LED1 VIN RSENSE1 10 Ω VOUT2 CAP2 RC CC C1 1 µF C2 0.47 µF RFB2 2.21M Ω Q2 A5 A1 A4 A3 C3 10 µF L2 10 µF SW1 GND2 FB2 CTRL2 CTRL1 GND1 R Q1 182k Ω CIN 4.7 µF L1 15 µF |
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