GENERAL DESCRIPTION
    AX3164 is a step-down switching PWM controller. These devise include a reference voltage source, oscillation circuit, error amplifier. External P-channel MOSFET is need in application circuit for switching driver.
    AX3164 controller provides low-ripple power, high efficiency, and excellent transient characteristics control. The AX3164 PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This controller is build out soft start function that prevents overshoot and inrush current at startup. An over current protect function and short circuit protect function are determined external VCC-SENSE resistor, and when OCP or SCP happens, the operation frequency will be reduced. An external compensation is easily to system stable; the low ESR output capacitor can be used. 
     With the addition of a P-channel Power MOSFET, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L package, providing such outstanding features as low current consumption. Since this controller can accommodate an input voltage up to 58V, it is also suitable for the operation via an AC adapter.

FEATURES
- Input voltage：10V to 58V
- Output voltage：3.3V to 56V
- Duty ratio：0% to 100% PWM control
- Soft-Start function
- Current limit, Short Circuit Protect (SCP) protection and thermal Shutdown protection
- External SW P-channel MOSFET.
- SOP-8L Pb-Free package.