AOS AOZ2387QI

The AOZ2387QI is a high-efficiency, easy-to-use, synchronous buck regulator optimized for notebook computers. The regulator is capable of supplying 20 A of continuous output current with an output voltage adjustable down to 0.6 V. The programmable on-time from 80 ns to 3.5 μs enables optimizing the configuration for PCB area and efficiency. The input voltage of AOZ2387QI can be as low as 5.5 V. The highest input voltage of AOZ2387QI can be 25 V. Constant on-time PWM with input feed-forward control scheme results in ultra-fast transient response while maintaining relatively constant switching frequency over the entire input range. True AC current mode control scheme guarantees the regulator can be stable with ceramics output capacitor. The switching frequency can be externally programmed. Protection features include VCC under-voltage lockout, current limit, output over voltage and under voltage protection, short-circuit protection, and thermal shutdown. The AOZ2387QI is available in 28-pin 5 mm × 5 mm QFN package.

• High-efficiency, easy-to-use DC/DC synchronous buck regulator
• Operates up to 25 V
• Capable of supplying 20 A of continuous output current
• Output voltage adjustable down to 0.6 V (±1.0%)
• Integrates an internal linear regulator to generate 5.3 V VCC from input
• Proprietary constant on-time PWM control with input feed-forward for ultra-fast transient response and relatively constant switching frequency
• Low 80 ns minimum on-time for very low output voltages at ultra-high operating frequencies
• Integrated AC ripple injection enables all-ceramic low ESR output filter capacitors and smaller PCB footprint
• Selectable PFM mode for light load efficiency optimization and forced PWM mode for lower harmonic noise
• Multiple protection functions: VCC under-voltage lockout, cycle-by-cycle current limit, output over-voltage protection, short-circuit protection, and thermal shutdown
• Available in a 5 mm × 5 mm QFN-28L package
• Rated over a -40°C to +85°C ambient temperature range
• Wide input voltage range: 5.5 V to 25 V if internal LDO supply VCC; 4 V to 25 V if external VCC supply
• Low RDS(ON) internal NFETs: 5 mΩ high-side, 1.8 mΩ low-side
• Internal LDO
• Constant On-Time with input feed-forward, programmable on-time up to 3.5 μs and down to 80 ns
• Programmable switching frequency range: 1 MHz (for 12 VIN to 1 VOUT)
• Selectable PFM or forced PWM light load operation
• Ceramic capacitor stable
• Remote Sense
• Adjustable current limit setting
• Adjustable soft start
• Power Good output
• Integrated bootstrap diode
• Under-voltage protection and over-voltage protection
• Cycle-by-cycle current limit
• Short-circuit protection
• Thermal shutdown
• Thermally enhanced 5 mm x 5 mm QFN-28L package

• Compact PCs and gaming systems
• Set-top boxes and LCD TVs
• Server and storage systems
• Datacom and networking
• Embedded computing
• Point-of load DC/DC converters