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FAN5632MPX Datasheet(PDF) 10 Page - Fairchild Semiconductor |
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FAN5632MPX Datasheet(HTML) 10 Page - Fairchild Semiconductor |
10 / 13 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5631/FAN5632 Rev. 1.0.2 10 Applications Information The FAN5631/FAN5632 requires one ceramic bucket capacitor in the 0.1µF to 1µF range, one 10µF output bypass capacitor, and one 10µF input bypass capacitor. To obtain optimum output ripple and noise performance, low-ESR (<0.05 Ω) ceramic input and output bypass capacitors are recommended. X5R- and X7R-rated capacitors provide adequate performance over the -40°C to 85°C temperature range. The bucket capacitor’s value is dependent on load current requirements. A 1µF bucket capacitor works well in all applications at all load currents, while a 0.1µF capacitor supports most applications under 100mA of load current. The choice of bucket capacitor values should be verified in the actual application at the lowest input voltage and highest load current. A 30% margin of safety is recommended to account for the tolerance of the bucket capacitor and the variations in the on- resistance of the internal switches. One of the key benefits of the ScalarPump architecture is that the dynamically scaled on resistance of the switches effectively reduces the peak current in the bucket capacitor and therefore input and output ripple currents are also reduced. Nevertheless, due to the ESR of the input and output bypass capacitors, these current spikes generate voltage spikes at the input and output pins. These ESR spikes can be filtered because their frequencies lie at up to 12 times the clock frequencies. In applications where conductive and radiated EMI/RFI interference must be low as possible, consider additional input and output filtering. Layout Considerations While evaluating any switched capacitor DC-DC converter, be careful to keep the power supply source impedance low; use of long wires causing high lead inductances and resistive losses should be avoided. A carefully laid-out ground plane is essential because current spikes are generated as the bucket capacitor is charged and discharged. The input and output bypass capacitors should be placed as close to the device pins as possible. |
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