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Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.1.5 Oct.15, 2019

AX3117

PWM Control 3A Step-Down Converter

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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 switching 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.

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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 mode 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