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发布者:来自网络 发布时间:2022/8/8 阅读:362次    关键字: DC-DC
AX3903-18V 3A 500kHz Synchronous Buck Converter


AX3903-18V 3A 500kHz Synchronous Step-Down DC/DC Converter SOT23-6 DataSheet

GENERAL DESCRIPTION
    The AX3903 is a high efficiency, 3A current mode synchronous step-down DC/DC converterwith a wide input voltage range from 4.7V to 18V. The device integrates high side and low sideMOSFETs to achieve high efficiency conversion. The current mode architecture supports fasttransient response and internal compensation.
    The AX3903 provides complete fault protection including input under-voltage lockout, outputshort circuit protection,over current protection, and thermal shutdown. The switching frequencyis internally set at 500kHz.
    To improve the light load efficiency,AX3903has proprietary light load power saving mode(PSM) to minimize the switching loss by reducing the switching frequency.
    The AX3903 is available in the SOT23_6L package.

FEATURES
-Input Voltage Range from 4.7V to 18V
-Adjustable Output Voltage from 0.8V to 12V
-Support 100% Duty Cycle Operation
-500kHz Switching Frequency
-Built-in 110mΩ/60mΩ Power Switch
-3A Continuous Output Current
-High Efficiency up to 95%
-Internal 1msec Soft-Start
-Peak Current Mode Operation
-Over-temperature Protection
-Input Under Voltage Lockout (UVLO)
-Cycle-by-Cycle Current Limit Protection
-Over-Load and Short Circuit Protection
-Thermal Shutdown Protection
-Available ina Small SOT23_6L Package
-Pb-Free RoHS Compliant
-RoHS and Halogen free compliance

APPLICATION
-Wireless and DSL Card
-Portable/Handheld Device
-STB, TV, Sound Bar, MP3 Player
-Microprocessor and DSP Core Supply

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