AMS3108 datasheet(8/10 Pages) ADMOS

Part #	AMS3108

Description	Low self noise

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Manufacturer	ADMOS [Advanced Monolithic Systems]

Direct Link	http://www.advanced-monolithic.com

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8 / 10 page

AMS3108

Micropower 700mA Low Noise Fast Transient Response LDO

02/11/2010

www.advanced-monolithic.com

Phone (925) 443-0722

8

Fax (925) 443-0723

PCB Layout

The following guidelines should be followed to insure

proper layout.

1. VIN Capacitor. A low ESR ceramic bypass

capacitor must be placed as close to the IC as

possible.

2. Adjustable (ADJ) Feedback Resistors. The

adjustable feedback resistors should be placed as

close as possible the IC. Minimize the length of

the trace from the feedback pin to the resistors.

This is a high impedance node susceptible to

interference from external RF noise sources.

3. Ground.

4. For good thermal performance vias are required

to couple the exposed tab of the SO-8 package to

the PCB ground plane. The via diameter should

be 0.3mm to 0.33mm positioned on a 1.2mm grid.

Output Power and Thermal Limits

The AMS3108 junction temperature and current

capability depends on the internal dissipation and the

junction to case thermal resistance of the SO-8

exposed paddle package.

Additionally, the paddle and PCB temperature will be

elevated due to the total losses of the LDO and of

other circuits mounted to the PCB.

Tjmax = Pd·θjc + Tpcb + Tamb

The internal losses contribute to the junction

temperature rise above the paddle and PCB

temperature.

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