ACT2103 datasheet(9/16 Pages) ACTIVE-SEMI

9 / 16 page

ACT2103

Rev 2, 23-May-12

Innovative PowerTM

- 9 -

www.active-semi.com

PC Board Layout Guidance

When laying out the printed circuit board, the

following checklist should be used to ensure proper

operation of the IC.

1) Arrange the power components to reduce both

the AC loop and DC loop size. AC loop includes

input cap, VIN pin and VIN ground pin, DC loop

includes SW pin, inductor, output capacitor and

ground pin.

2) Place input decoupling ceramic capacitor CIN as

close to IN pin as possible. CIN is connected

power GND with vias or short and wide path.

3) Return FB, COMP and ISET to signal GND pin,

and connect the signal GND to power GND at a

single point for best noise immunity.

4) Use copper plane for power GND for best heat

dissipation and noise immunity.

5) Place feedback resistor close to FB pin.

6) Use short trace connecting HSB-CHSB-SW loop

Figure 3 shows an example of PCB layout.

Figure 4 and Figure 5 give two typical car charger

application schematics and associated BOM list.

Figure 3: PCB Layout

ACT2103 数据表(PDF) 9 Page - Active-Semi, Inc