SC508 datasheet(29/32 Pages) SEMTECH

29 / 32 page

SC508/SC508A

Applications Information (continued)

Place the R

TON resistor near the TON pin. Route

TON to the TON pin and to AGND using short

traces and avoid all switching signals.

Bypass Capacitors

The device requires bypass capacitors for the following

pins.

VDDA pin with respect to AGND. This 0.1μF

minimum capacitor must be placed and routed

close to the IC pins, on the same layer as the IC.

This capacitor also functions as bypass for the

LDO output, since the VDDA and VLDO pins are

adjacent.

VDDP with respect to PGND. This 1μF minimum

capacitor must be placed and routed close to

the IC pins and on the same layer as the IC.

BST pin with respect to LX. This 0.1μF minimum

capacitor must be placed near the IC, on either

side of the PCB. Use short traces for the routing

between the capacitor and the IC.

VIN pin with respect to AGND. This 0.1μF

minimum capacitor must be placed and routed

close to the IC pins. This capacitor provides

noise filtering for the input to the internal LDO.

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SC508 数据表(PDF) 29 Page - Semtech Corporation