Datasheet > AMS3121

AMS3121

更新时间： 2024-01-28 17:48:51

品牌	Logo	应用领域
奥地利微 - AMS		/
页数	文件大小	规格书
9页	327K
描述
2A Fast Transient Linear Regulator

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AMS3121 技术参数

生命周期：	Contact Manufacturer	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.59

AMS3121 数据手册

AMS3121

2A Fast Transient Linear Regulator

Device Summary

PCB Layout

The following guidelines should be followed to insure

proper layout.

The AMS3121 is a high voltage low drop out linear

regulator with a current capability of up to 2A. The

LDO has an 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.

1. V_INCapacitor. 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 exposed tab of both 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.

Fault Protection

Short circuit and over-temperature shutdown disable

the converter and LDO in the event of an overload

condition. Overtemp shutdown disables the device

when the junction temperature exceeds 145 ºC. The

output current is internally limited to 2.5A.

Output Power and Thermal Limits

The AMS3121 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.

Input Capacitor

An input bypass capacitor ranging from 1µF to 10µF

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.

Tjmax=Pd·θjc+Tpcb+Tamb

The internal losses contribute to the junction

temperature rise above the paddle and PCB

temperature.

02/11/2010

www.advanced-monolithic.com

Phone (925) 443-0722

Fax (925) 443-0723

1...4 5 678 9

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