? GENERAL DESCRIPTION

AX3117/A/B consists of step down switching regulator with PWM control. The device includes a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.

AX3117/A/B provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly forms 0 up to 100%. An over current protection and short circuit protection functions are built outside that it can set by a resistance. An external compensation is easily to system stable; the low ESR output capacitor can be used.

With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step down s witching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L-EP package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 40V, it is also suitable for the operation via an AC adapter.

? FEATURES

- Input Voltage 8V to 40V

- Duty ratio 0% to 100% PWM control

- Oscillation frequency 100K/300KHz

- Thermal Shutdown function.

- Short Circuit Protect (SCP).

- Built in internal SW P-channel MOS.

- Current mo de non-synchronous PWM converter

- External current limit setting.

- Under Voltage Lockout.

- Over Voltage Protection.

- Line-compensation built in.

- SOP-8L-EP Pb-Free package.

- RoHS and Halogen free compliance.