• Low RDS(ON) for Internal Switches (Top/Bottom): 70 mΩ /40 mΩ
• 4.5-30V Input Voltage Range
• Instant PWM Architecture to Achieve Fast Transient Responses
• External Soft-start Limits the Inrush Current
• Pseudo-constant Frequency: 500kHz at Heavy Loads
• 5A Continuous, 6A Peak Load Current Capability
• 1.5% 0.6V Reference
• Output Over Current Limit
• Output Short Circuit Protection with Current Fold Back
• Thermal Shutdown and Auto Recovery
• RoHS Compliant and Halogen Free
• Compact Package:DFN4×3-12

The SY21211, high efficiency synchronous step-down DC/DC converter is capable of delivering 5A output current while operating over a wide input voltage range from 4.5V to 30V. The device integrates very low RDS(ON) main and synchronous MOSFETs to minimize the conduction loss and deliver high efficiency.

The SY21211 uses the instant PWM architecture to achieve fast transient responses for high step-down ratio applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500kHz under continuous conduction mode to minimize the size of inductor and capacitor.

The device is available in a 3mm x 4 mm DFN package.