AMS3131 datasheet(7/9 Pages) ADMOS

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AMS3131

3A Fast Transient Linear Regulator

02/11/2010

www.advanced-monolithic.com

Phone (925) 443-0722

Fax (925) 443-0723

Device Summary

The AMS3131 is a high voltage low drop out linear

regulator with a current capability of up to 3A. The

LDO has a recommended operating input voltage

range of 1.5V to 7V with an output voltage as low as

0.6V and is stable with a wide range of ceramic,

tantalum, and electrolytic output capacitors.

Fault Protection

Short circuit and over-temperature shutdown disable

the converter and LDO in the event of an overload

condition. Over-temp shutdown disables the device

when the junction temperature exceeds 145 ºC. The

output current is internally limited to 6A typical.

Input Capacitor

An input bypass capacitor ranging from 1µF to 22µF

is required. The capacitor should be placed as close

as possible to the device and not be placed more than

1 inch from the LDO.

Output Capacitor

The output capacitor requirements range from the

minimum value required to guarantee stability to

larger values required to meet the extreme transient

response requirements. Values range from 10 to

22µF X5R ceramic capacitors. Due to the extreme

voltage coefficient of X5R ceramic capacitors, the

voltage rating should be at least double the maximum

applied voltage.

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. Ground.

3. For good thermal performance vias are required

to couple the tab of the TO-220 and TO-263

packages 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 AMS3131 junction temperature and current

capability depends on the internal dissipation and the

junction to case thermal resistance of the TO-220 and

TO-263 exposed tab packages. Additionally, the tab

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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