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AMS3121T-XX датащи(PDF) 7 Page - Advanced Monolithic Systems Ltd

номер детали AMS3121T-XX
подробное описание детали  2A Fast Transient Linear Regulator
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производитель  AMS [Advanced Monolithic Systems Ltd]
домашняя страница   http://www.ams-semitech.com
Logo AMS - Advanced Monolithic Systems Ltd

AMS3121T-XX датащи(HTML) 7 Page - Advanced Monolithic Systems Ltd

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AMS3121
2A Fast Transient Linear Regulator
02/11/2010
www.advanced-monolithic.com
Phone (925) 443-0722
7
Fax (925) 443-0723
Device Summary
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.
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.
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.
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 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.
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.
Tjmax=Pd·θjc+Tpcb+Tamb
The internal losses contribute to the junction
temperature rise above the paddle and PCB
temperature.


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