Alpha & Omega Semiconductor AOZ1239PI

Description

The AOZ1239 demo board is a fully assembled and tested circuit board built with the AOZ1238 buck regulator IC. It outputs an adjustable voltage up to 10A of continuous current. The evaluation board requires an input voltage from 4.5V to 28V. The output voltage is preset at 1.05V and can be adjusted down to 0.6V.

AOZ1238 operate at constant on-time mode. The demo board circuit operates at about 600KHz switching frequency. The frequency can be set by changing on-time setting. The AOZ1239-DEMO-02 circuit incorporates features like current limit, short circuit protection, Vcc under voltage lock out, output overvoltage protection and thermal shut down.

The AOZ1239-DEMO-02 demonstrates the COT buck converter design. Different output voltage designs need follow application note to change parameters.

Features

• 4.5V to 28V operating input voltage range
• 10A continuous output current
• Output voltage adjustable to 0.6V±1.0%
• Two bits VID control
• Constant On-Time with input feed-forward
• Programmable frequency up to 1MHz
• Ceramic capacitor stable
• Adjustable soft start
• Internal 5.3V/20mA linear regulator
• Power Good output
• Integrated bootstrap diode
• Cycle-by-cycle current limit
• Short-circuit protection
• Thermal shutdown
• Thermally enhanced 5mmX5mm QFN-30L package

Typical applications

• Point of load DC/DC converters
• Graphics cards
• Cable modems
• LCD TVs
• Compact desktop PCs
• Portable computers
• Set top boxes
• Telecom/Networking/Datacom equipment
• Servers