• 4.2–40V Input Voltage Range
• 3.5A Output Current Capability
• Low RDS(ON) for Internal Switches:115mΩ Top, 80mΩ Bottom
• 18µA Quiescent Current
• Internal Compensation 
• Internal 1ms Soft-Start Limits Inrush Current
• Adjustable Switching Frequency Range: 300kHz to 2.2MHz
• ±2% 0.6V Reference over the -40°C to +125°C Temperature Range
• Cycle-by-Cycle Peak Current Limit
• Short-Circuit Protection
• Thermal Shutdown and Automatic Recovery
• RoHS-Compliant and Halogen-Free
• Compact SO8E Package
• Automotive AEC-Q100 Grade 1 Certified

The SY2A22404 high-efficiency synchronous step-down DC-DC converter operates over a wide input voltage range (4.2V to 40V) and can deliver 3.5A load current. The device integrates the main switch and synchronous switch with very low RDS(ON) to minimize conduction loss.

The SY2A22404 employs a peak-current-mode control strategy with a constant switching frequency that is adjustable from 300kHz to 2.2MHz using an external resistor. When the internal clock becomes active, the top FET switches on. When the top FET current-sense signal reaches internal VCOMP, the top FET switches off and the bottom FET switches on. The internal clock frequency is programmable using the external resistor RFS.

The device operates with low quiescent current (18µA typical) to achieve high efficiency under light load, and it features an internal soft-start to limit inrush current during power-on.

The SY2A22404 is available in a compact 8-pin SO8E package.