ISL78228ARZ

The ISL78228 is a high efficiency, dual synchronous step-down DC/DC regulator that can deliver up to 800mA continuous output current per channel. The supply voltage range of 2.75V to 5.5V allows for the use of a 3.3V or 5V input. The current mode control architecture enables very low duty cycle operation at high frequency with fast transient response and excellent loop stability. The ISL78228 operates above the AM radio band as well as the 2.25MHz switching frequency, allowing for the use of small, low cost inductors and capacitors. Each channel is optimized for generating an output voltage as-low-as 0.6V. The ISL78228 offers a 1ms power-good (PG) to monitor both outputs at power-up. When shutdown, ISL78228 discharges the outputs capacitor. Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown. The ISL78228 is offered in a 3mm x 3mm 10 Ld DFN package with 1mm maximum height. The complete converter occupies less than 1.8cm2 area.

• Internal current mode compensation
• 100% maximum duty cycle for lowest dropout
• Selectable forced PWM mode and PFM mode
• External synchronization up to 4MHz
• Start-up with pre-biased output
• Soft-stop output discharge during disabled
• Internal digital soft-start - 2ms
• Power-good (PG) output with 1ms delay
• AEC-Q100 tested
• Pb-free (RoHS compliant)