GENERAL DESCRIPTION

AX2003 consists of step-down switching regulator with PWM control. These devise

include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and

etc.

AX2003 provides low-ripple power, high efficiency, and excellent transient

characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to 100%.

An enable function, an over current protect function and short circuit protect function are

built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also,

an internal compensation block is built in to minimum external component count.

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 package,

providing such outstanding features as low current consumption. Since this converter can

accommodate an input voltage up to 23V, it is also suitable for the operation via an AC

adapter.

FEATURES

- Input voltage：3.6V to 23V

- Output voltage：0.25V to VCC

- LED Backlight and High Power LED Application

- Duty ratio：0% to 100% PWM control

- Oscillation frequency：330KHz typ.

- Enable/Disable function.

- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).

- Built-in internal SW P-channel MOS.

- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.

- SOP-8L Pb-Free package.