The AMS1117 is a forward low voltage drop regulator with a voltage drop of 1.2V at 1A current.
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The AMS1117 is available in two versions: fixed output version and adjustable version, with fixed output voltage of 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0V, with 1% accuracy; A fixed output voltage of 1.2V has an accuracy of 2%.
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The AMS1117 has an integrated overheat protection and current limiting circuit, making it the best choice for battery-powered and portable computers.
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The AMS1117 series regulators are available in adjustable and multiple fixed voltage versions and are designed to provide 1A output current with operating voltage differentials as low as 1V. At maximum output current, the minimum differential pressure of the AMS1117 device is guaranteed not to exceed 1.3V, and gradually decreases as the load current decreases.
ams1117 buck circuit principle:
AMS1117 chip is a forward low-voltage differential regulator with integrated overheating protection and current limiting circuit. Its fixed output version voltage can be 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0V. The 3.3V output is ASM1117-3.3 chip. AMS1117 step-down circuit
C25 and C27 are input capacitors, which are used to prevent voltage inversion after power failure. C26 and C28 are output filter capacitors, which are used to suppress self-excited oscillation and stabilize output voltage.