Micro SMD Wafer Level Chip Scale Package: PCB, Layout, and Mounting Considerations
www.ti.com
15.10.2 Bypass Capacitor Value Selection
Besides minimizing the input capacitor size, careful consideration should be paid to value of C
B
, the
capacitor connected to the BYPASS pin. Since C
B
determines how fast the LM49100 settles to quiescent
operation, its value is critical when minimizing turn-on pops. Choosing C
B
equal to 2.2µF along with a
small value of C
i
(in the range of 0.1µF to 0.33µF), produces a click-less and pop-less shutdown function.
As discussed above, choosing C
IN
no larger than necessary for the desired bandwidth helps minimize
clicks and pops. C
B
's value should be in the range of 4 to 5 times the value of C
IN
. This ensures that
output transients are eliminated when power is first applied or the LM49100 resumes operation after
shutdown.
16
Micro SMD Wafer Level Chip Scale Package: PCB, Layout, and Mounting
Considerations
Please refer to AN-1112 DSBGA Wafer Level Chip Scale Package (
SNVA009
) for possible updates to the
μ
SMD package information.
17
Demo Board Schematic
18
AN-1622 LM49100 Evaluation Board»
SNAA043A – October 2007 – Revised May 2013
Submit Documentation Feedback
Copyright © 2007–2013, Texas Instruments Incorporated