ACT2802 datasheet(15/21 Pages) ACTIVE-SEMI

15 / 21 page

ACT2802

Rev 0, 21-Jan-14

Innovative PowerTM

- 15 -

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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 the

AC loop size, VIN pin, Vout pin, SW pin and the

schottky diode.

2. Place input decoupling ceramic capacitor C3

and R10 as close to VIN pin as possible.

Resistor R10 is added in series with capacitor

C3 to damp the potential LC resonance .

3. Use copper plane for power GND for best heat

dissipation and noise immunity.

4. Place CSP and CSN capacitor C6 (10nF) close

to CSP and CSN pin as possible, use Kevin

Sense from sense resistor R2 and R2A to CSP

and CSN pins. 22uF decoupling capacitor is

added close to BAT pin.

5. Place the ceramic capacitor C2 and D1 as

close to VOUT and PGND as possible, SW

goes under the C2 (recommend C2 to use 1206

size). SW pad is a noisy node switching. It

should be isolated away from the rest of circuit

for good EMI and low noise operation.

6. Thermal pad is connected to GND layer through

vias (recommend 4X4 pins and the aperture is

10mil). Ground plane, PGND and AGND is

single point connected under the ACT2802

thermal pad through vias to limited SW area.

7. From BAT pin to the Battery positive terminal,

need to lay the divided line to ensure the

battery voltage accuracy of sampling.

8. RC snubber is recommended to add across SW

to PGND to reduce EMI noise. 1A /20V schottky

is added to across VOUT and SW pins.

A demo board PCB layout example is shown in the

figure 19.

Top Layer

Figure 19.

PCB Layout

Bottom Layer

PC Board Layout Guidance

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