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AMS3121T-XX датащи(PDF) 7 Page - Advanced Monolithic Systems Ltd |
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AMS3121T-XX датащи(HTML) 7 Page - Advanced Monolithic Systems Ltd |
7 / 9 page 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. |
Аналогичный номер детали - AMS3121T-XX |
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Аналогичное описание - AMS3121T-XX |
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