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Rev.1.1 Oct 02, 2019

AX3901

18V/2A High Efficiency Synchronous Rectified

Step-Down DC/DC Converter



GENERAL DESCRIPTION

The AX3901 is a high efficiency synchronous step-down DC/DC converter series with 2A

continuous output current supplied.

A built-in Under Voltage Lockout (UVLO) circuit is provided to prevent start-up until the input

voltage reaches to 4.5V. In addition, it features over-current protection and thermal shutdown.

To improve the light load efficiency, it is designed as the power saving mode (PSM) to

minimize the switching loss by reducing the switching frequency.

The AX3901 is available in SOT-23-6L and TDFN-6L Packages.



FEATURES

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Input Voltage Supply Range from 4.5V to 18V

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Power Saving Mode (PSM) during the light Load Operation1.2MHz

Constant Frequency Operation

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High Efficiency up to 95%

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Adjustable Output Voltage from 0.6V to 12V

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2 A Continuous Output Current

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500kHz Constant Frequency Operation

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Current Mode Operation

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Over-temperature Protection

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Over-current Protection

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Input Under Voltage Lockout (UVLO)

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10µA Shutdown Current

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RoHS Compliant (100% Green Available)

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RoHS and Halogen free compliance