Datasheet PAM8907 (Diodes) - 7

PAM8907 Application Information
(continued)
Capacitor Selection Guide
The external capacitors are required to use low ESR ceramic capacitors. It is strongly recommended to place them at the same layout layer as PAM8907.
Power Supply Decoupling – VIN (Pin 10)
Capacitor Value: 1μF +10μF Voltage Rating: 2 x VIN
N
Capacitor layout: place the 1μF capacitor close to VIN (Pin 10), and 10μF close to the inductor
IO External LDO – VCC (Pin 1) T
Capacitor Value: 1μF
A
Voltage Rating: 10V or 16V
M R
Capacitor layout: place the capacitor close to VCC (Pin 1)
O Bootstrap – BOOT (Pin 3) F
Capacitor Value: 0.1μF
IN
Voltage Rating: 25V or higher
D
Capacitor layout: place the capacitor close to BOOT (Pin 3)
E C Boost Output – VOUT (Pin 5) N
Capacitor Value: 1μF or 2.2μF, for smoke alarm application, if loading is higher than 100nF, put a 10μF capacitor at the VOUT pin.
A
Voltage Rating: 25V or higher
V D
Capacitor layout: place the capacitor close to VOUT (Pin 5)
A Schottky Diode
This is optional. A Schottky diode between SW and VOUT (in parallel with high-side FET of the Boost converter) can reduce the power consumption by approximately 20%. A 20V Schottky with current rating of 1A is preferred.
GND Layout Guideline
The GND layout is important to enable PAM8907 to operate under optimal conditions. Suggested layout for GND is illustrated below. Please consult with Diodes Incorporated’s technical support team or field representative for any further assistance, if necessary. Connect first GND (Pin 2) to PAM8907’s epoxy pad, then expand the GND line to VCC/VIN’s capacitor’s GND and place many vias on the GND trace, then connect with VOUT pin’s CAP GND. Place these capacitors as close as possible to PAM8907. PAM8907 7 of 10 May 2021 Document number: DS43314 Rev. 2 - 2
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