Alpha & Omega Semiconductor AOZ1233Q1

Description

The AOZ1233 demo board is a fully assembled and tested circuit board built with the AOZ1233-01 buck regulator IC. It outputs an adjustable voltage up to 4A 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 0.8V.

AOZ1233 operate at constant on-time mode. The demo board circuit operates at about 400KHz switching frequency. The frequency can be set by changing on-time setting. The AOZ1233-DEMO-01 circuit incorporates features like current limit, short circuit protection, Vcc under voltage lock out, output overvoltage protection and thermal shut down.

The AOZ1233-DEMO-01 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
• 4A continuous output current
• Output voltage adjustable to 0.8V±1.0%
• Low Rds(on) internal NFETs
• – 40mΩ high-side
• – 25mΩ low-side SRFET™
• Constant On-Time with input feed-forward
• Programmable frequency up to 1MHz
• Ceramic capacitor stable
• Adjustable soft start
• Safe start with pre-biased output
• Power Good output
• Integrated bootstrap diode
• Cycle-by-cycle current limit
• Short-circuit protection
• Thermal shutdown
• Thermally enhanced 5mmX5mm QFN-30L packageREMARKS:-IC AVAILABLE IN IC FOLDER

Typical applications

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