? GENERAL DESCRIPTION

AX3051/A is a wide input voltage, high efficiency Active CC step down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode.

AX3051/A consists of step down switching regulator with PWM control. The device includes a reference voltage source, oscillation circuit, error amplifier and etc.

AX3051/A 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 90%. An over current protection function is 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 N-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 packages, providing such outstanding features as low current consumption. Since this converter can acco mmodate an input voltage up to 34V.

? FEATURES

- Input Voltage 8V to 34V

- Vout Accuracy (VFB=1V) ±1%/±2%

- CC/CV mode(Constant Curr ent and Constant Voltage)

- Up to 2.8A output current

- ±5%/±15% Current limit Accuracy

- Duty ratio 0% to 90 % PWM control

- Oscillation frequency :

AX3051: 100KHz

AX3051A: 250KHz

- Thermal Shutdown function.

- Short Circuit Protect (SCP).

- Built in internal LX N-channel MOS.

- Current mode non synchronous PWM converter

- External current limit setting.

- Over Voltage Protection 5.8V.

- Built in adjustable line compensation.

- SOP-8L-EP Pb Free packages.

- RoHS and Halogen free compliance

? APPLICATIONS

- Car charger

- Portable charger Device.