Alpha & Omega Semiconductor AOZ1231Q1

Description

The AOZ1231 demo board is a fully assembled and tested circuit board built with the AOZ1231-01 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.

AOZ1231 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 AOZ1231-DEMO-01 circuit incorporates features like current limit, short circuit protection, Vcc under voltage lock out, output overvoltage protection and thermal shut down.

The AOZ1231-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

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