SC2441AEVB(2006) 查看數據表（PDF） - Semtech Corporation

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SC2441AEVB
(Rev.:2006)

1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter

Semtech Corporation 

POWER MANAGEMENT

Applications Information

Control Section

6) The frequency-setting resistor Rosc should be placed

close to Pin 10. Trace length from this resistor to the

analog ground should be minimized.

7) Solder the VCC decoupling capacitor next to the VCC

and power ground PGND pins.

8) Place the current-sensing components away from the

power circuit and close to the corresponding CS+ and

CS- pins. Use X7R type ceramic capacitors for current

sensing due to their thermal stability. The distance

between the two trace should be as close as possible to

minize the noise pick-up.

9) Use an isolated local ground plane for the controller

and tie it to the negative side of output capacitor bank.

10) A large copper area underneath the SC2441A IC is

nessary for heat sinking purpose. And multiple layers of

large copper area connected through vias can be used

for better thermal performance. The size of the vias as

the connection between multiple layers should not be

too large or solder may seep through the big vias to the

the bottom layer during the re-flow process.

SC2441A

 2006 Semtech Corp.

36

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