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Table 3. PCB Layout guidelines

Table 4. Component list

The component list is shared in two sections: the first for the general-purpose component, the second for power

section:

GENERAL-PURPOSE SECTION

Goal

Suggestion

Low radiation and low magnetic coupling

with the adjacent circuitry.

Side and Low side MOSFETS, Shottky diode as close as possible).

2) Controller placed as close as possible to the power MOSFET.

3) Group the gate drive component (Boot cap and diode together near

the IC.

Don’t penalty the efficiency.

Keep power traces and load connections short and wide.

Ensure high accuracy in the current sense

system.

Phase pin and PGND pin must be made with Kelvin connection and as

close as possible to the Low Side MOSFETS.

Reduce the noise effect on IC.

1) Put the feedback component (like output divider, integrator network,

etc) as close as possible to the IC.

2) The feedback traces must be parallel and as close as possible.

Moreover they must be routed as far as possible from the switching

current loops.

3) Make the controller ground connection like the figure 19.

Part name

Value

Dimension

Notes

RESISTOR

R1

100

Ω

0603

Output resistor divider for the

linear regulator.

R2

300

Ω

0603

R3

560k

Ω

0603

Input resistor divider

(To set switching frequency)

R4

33k

Ω

0603

R5

47

Ω

0603

R6, R7, R11, R12

33k

Ω

0603

R8

47k

Ω

0603

Current limit resistor

(To set current limit)

R9

390

Ω

0603

Output resistor divider

(To set output voltage)

R10

1K

Ω

0603

R13

220

Ω

0603

CAPACITOR

C1

220nF

0805

C2

47

µF

KEMET-16V

C3

220nF

0805

C4

330pF

0603

First integrator capacitor

C5

47pF

0603

C6

10nF

0603

C7

N.M.

0603

Second integrator capacitor

C19

220nF

0805

C20

220nF

0603

Softstart capacitor