? GENERAL DESCRIPTION

The AX3007 series are monolithic IC designed for a step down DC/DC converter, and own the ability of driving a 2A load without additional transistor. It saves board space. The external shutdown f unction 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 tempe rature 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 AX3007 series operates at a switching fre quency 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 chips are available in standard 8-lead SOP, SOP-8L with Exposed pad and TO263-5L packages.

? FEATURES

- Output voltage: 3.3V, 5V, 12V and adjustable output version1.

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

- 150KHz fixed switching frequency.

- Voltage mode non synchronous PWM control.

- Thermal sh utdown and current limit protection.

- ON/OFF shutdown control input.

- Short Circuit Protect (SCP).

- Operating voltage can be up to 40V.

- Output load current: 2A.

- SOP-8L, SOP-8L-EP and TO263-5L Pb-Free packages.

- Low power standby mode.

- Built in switching transi stor on chip.

- RoHS and Halogen free compliance.