GENERAL D*CRIPTION
The AMS1117 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V at maximum output current, decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload conditions on both the regulator and power source circuitry.

FEATUR*
APPLICATIONS
• Three Terminal Adjustable or Fixed Voltages*
• High Efficiency Linear Regulators
1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V
•Post Regulators for Switching Supplies
• Output Current of 1A
• 5V to 3.3V Linear Regulator
• Operates Down to 1V Dropout
• Battery Chargers
• Line Regulation: 0.2% Max.
• Active SCSI Terminators
• Load Regulation: 0.4% Max.
• Power Management for Notebook
• SOT-223, TO-252 and SO-8 package available
• Battery Powered Instrumentation

APPLICATION HINTS
The AMS1117 series of adjustable and fixed regulators are easy to use and are protected against short circuit and thermal overloads. Thermal protection circuitry will shut-down the regulator should the junction temperature exceed 165°C at the sense point.
Pin compatible with older three terminal adjustable regulators, these devices offer the advantage of a lower dropout voltage, more precise reference tolerance and improved reference stability with temperature.
Stability
The circuit design used in the AMS1117 series requires the use of an output capacitor as part of the device frequency compensation. The addition of 22μF solid tantalum on the output will ensure stability for all operating conditions.
When the adjustment terminal is b**ed with a capacitor to improve the ripple rejection, the requirement for an output capacitor increases. The value of 22μF tantalum covers all cases of b**ing the adjustment terminal. Without b**ing the adjustment terminal *aller capacitors can be used with equally good results.
To further improve stability and transient response of these devices larger values of output capacitor can be used.
Protection Diodes
Unlike older regulators, the AMS1117 family does not need any protection diodes between the adjustment pin and the output and from the output to the input to prevent over-stressing the die. Internal resistors are limiting the internal current paths on the AMS1117 adjustment pin, therefore even with capacitors on the adjustment pin no protection diode is needed to ensure device safety under short-circuit conditions.
Diodes between the input and output are not usually needed. Microsecond surge currents of 50A to 100A can be handled by the internal diode between the input and output pins of the device. In normal operations it is difficult to get those values of surge currents even with the use of large output capacitances. If high value output capacitors are used, such as 1000μF to 5000μF and the input pin is instantaneously shorted to ground, damage can occur. A diode from output to input is recommended, when a crowbar circuit at the input of the AMS1117 is used (Figure 1).

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经营范围：全系列二*管有：TVS瞬变抑制二*管，稳压二*管，快速二*管，*快速二*管，整流二*管，肖特基二*管，快恢复二*管，开关二*管，整流二*管，全系列桥堆等。

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主要封装有：SMA，S*，SMC，DO-35，DO-41，DO-15，DO-27，DO-201，SOD-123（1206），SOD-323（0805），SOD-523，SOT23-5，P-600（R-6），DIP-4，WOB，SOP-4，TO-92，TO-126，TO-220，TO-*，TO-247，TO-263，TO-252，TO-251，SOT-23，SOT-323，SOT-523，SOT-89，SOT-223等.全系列直插/贴片，品种广泛,竭诚欢迎海内外用户前来洽谈合作，共谋发展和建立长期的合作关系！感谢您关注本公司，更欢迎您选购本公司产品.  诚信合作--共赢未来

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