MPQ8634B datasheet(19/20 Pages) MPS | 16V, 20A, Sync, Step-Down Converter with Adjustable Current Limit, Programmable Frequency, and Voltage Tracking

MPQ8634B – 16V, 20A, SYNC, STEP-DOWN CONVERTER W/ ADJUSTABLE CURRENT LIMIT,

PROGRAMMBALE FREQUENCY, AND VOLTAGE TRACKING

MPQ8634B Rev. 1.02

www.MonolithicPower.com

11/16/2018

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

PCB Layout Guidelines

Efficient PCB layout is critical for stable

operation. For optimal performance, refer to

Figure 6 and follow the guidelines below.

1. Place the input MLCC capacitors as close

to VIN and PGND as possible.

2. Place the major MLCC capacitors on the

same layer as the MPQ8634B.

3. Maximize the VIN and PGND copper plane

to minimize parasitic impedance.

4. Place as many PGND vias as possible as

close to PGND as possible to minimize both

parasitic impedance and thermal resistance.

5. Place the VCC decoupling capacitor close

to the device.

6. Connect AGND and PGND at the point of

the VCC capacitor’s ground connection.

7. Place the BST capacitor as close to BST

and SW as possible with 20 mil or wider

traces to route the path. It is recommended

to use a bootstrap capacitor of 0.1μF to 1μF.

8. Place the REF capacitor close to TRK/REF

to VSNS-.

9. Place via at least 10mm away from the

positive side of the first input decoupling

capacitor close to the IC if it must be placed

on the PGOOD pad.

10. Place the OSENSE capacitor in between

the output sense lines and close to the

device.

Figure 6: Recommended PCB Layout

MPQ8634B Datasheet(HTML) 19 Page - Monolithic Power Systems