FAN2560 Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN2560

350mA Low-VIN LDO with Fast Transient Response

Fairchild Semiconductor 

Application Example: Post Regulator for a Switching Converter

The FAN2560 is an ideal choice for battery-powered

equipment. The low quiescent bias current can be

supplied directly from the battery, while the input

voltage can come from a high-efficiency buck regulator,

like FAN5350. This combination provides both best

efficiency and low noise output. As can be seen in the

scope pictures below the schematic, the already-low

output voltage ripple, inherent to a switching regulator,

is significantly attenuated by the FAN2560 at any

frequency within the switching operating range.

Figure 23. Post Regulator for a Switching Converter

Figure 24. PFM Mode (100mA Load) Buck Ripple

Rejection, Horizontal Scale: 500ns/div.

Figure 25. PWM, 3MHz (300mA Load) Buck Ripple

Rejection, Horizontal Scale: 200ns/div.

© 2006 Fairchild Semiconductor Corporation

FAN2560 • Rev. 1.0.1

9

www.fairchildsemi.com

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