? GENERAL DESCRIPTION

The AX3005 series are monolithic IC designed for a step down DC/DC converter, and own the ability of driving a 3A load without additional transistor. It saves board space. The external shutdown funct ion can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperatu re operating from damage, and current limit is against over current operating of the output switch. If current limit function occurs and VFB is down below 0.5V, the switching frequency will be reduced. The AX3005 series operates at a switching frequency of 150KHz thus allow smaller sized filter components than what would be needed with lower frequency switching regulators. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The chip is available in a 5-Lead TO263 package.

? FEATURES

- Outp ut voltage: 3.3V, 5V, 12V and adjustable output version.

- Adjustable version output voltage range, 1.23V to 38.5V.

- 150KHz fixed switching frequency.

- Voltage mode non synchronous PWM control.

- Thermal shutdown and current limit protection.

- ON/OFF shutdown con trol input.

- Short Circuit Protect (SCP).

- Operating voltage can be up to 40V.

- Output load current: 3A.

- 5-Lead TO263 Pb-Free packages.

- Low power standby mode.

- Built-in switching transistor on chip.

- RoHS and Halogen free compliance.