PAM8906

Document number: DS44739 Rev. 1 - 2

8 of 11

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December 2022

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PAM8906

Application Information (continued)

Capacitor Selection Guide

For external capacitors, use low ESR ceramic capacitors. It is strongly recommended to place them at the same layout layer as PAM8906.



Power Supply Decoupling Capacitor

– VIN (Pin 10)

Capacitor Value: 1

μF + 10μF

Voltage Rating: 3 x VIN

Capacitor Layout: place the 1

μF capacitor close to VIN (Pin 10), and 10μF close to the inductor



External LDO Capacitor

– VCC (Pin 1)

Capacitor Value: 1

μF

Voltage Rating: 16V

Capacitor Layout: place the capacitor close to VCC (Pin 1)



Bootstrap Capacitor

– BOOT (Pin 3)

Capacitor Value: 0.1

μF

Voltage Rating: 25V or higher

Capacitor Layout: place the capacitor close to BOOT (Pin 3)



Boost Output Capacitor

– VOUT (Pin 5)

Capacitor Value: 1

μF to 2.2μF, for smoke alarm application, if loading higher than 100nF, put a 10μF cap at the VOUT pin.

Voltage Rating: 3 x VOUT

Capacitor Layout: place the capacitor close to VOUT (Pin 5)

Schottky:



This is optional.



Place between SW and VOUT.



Schottky diode can help to reduce power consumption by approximately 20%.



Use a 20V Schottky with 1A or greater current rating.

GND Layout Guideline

The GND layout is very important for PAM8906 to operate under optimal conditions. Suggested ground layout is illustrated below. Please consult

with Diodes

Incorporated’s technical support team or field representative for any further assistance, if necessary.

Connect GND (Pin

2) to the bottom of IC, then expand to VCC/VIN/VOUT’s capacitor GND. Put more via on the other layer then connect to power

GND.