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CAT3604 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT3604 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 11 page CAT3604 9 Doc. No. 5008, Rev. I © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice TYPICAL CHARACTERISTICS V IN = 3.6V, EN = VIN, CIN = COUT = 1µF, unless otherwise specified. Foldback Current Limiting 0 1 2 3 4 5 0 100 200 300 400 500 OUTPUT CURRENT [mA] 1x mode RECOMMENDED LAYOUT When the driver is in the 1.5x charge pump mode, the 1MHz switching frequency operation requires to minimize trace length and impedance to ground on all 4 capacitors. A ground plane should cover the area on the bottom side of the PCB opposite to the IC and the bypass capacitors. Capacitors Cin and Cout require short connection to ground which can be done with multiple vias as shown on Figure 2. A Figure 2: PCB Layout square copper area matches the QFN16 exposed pad (GND) which is connected by a trace to the pin 12 pad (GND). A large via (metalized hole) centered in the square pad provides a low impedance connection to the ground plane on the opposite side of the PCB and allows the heat dissipated by the driver IC to spread out resulting in excellent thermal performance. Figure 3: Recommended QFN 16 Package Land Pattern 2.25 mm 0.35 mm 0.65 mm |
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