• Low R_DS(ON) for Internal MOSFETs: 150mΩ Top, 115mΩ Bottom
• Wide Input Voltage Range: 4.5V ~ 30V 
• Up to 2A Output Current
• ±1% 0.6V Reference over Temperature from -40°C to 125°C
• Precise EN Threshold
• PFM Light Load Operation for High Efficiency
• Internal Soft-Start Limits the Inrush Current
• Support Smooth Startup with Pre-Biased Output
• 600kHz Switching Frequency Minimizes the External Components
• Advanced Constant On-time and Ripple-Based Control to Achieve Fast Transient Responses
• Cycle-by-Cycle Valley and Peak Current Limit Protection
• Hic-Cup Mode Output Under Voltage Protection
• Auto-Recovery Mode Over Temperature Protection
• Input Under Voltage Lockout (UVLO)
• RoHS-Compliant and Halogen-Free
• Compact Package: SOT23-6

The SY21213 high efficiency 600kHz synchronous buck converter operates over a wide input voltage range of 4.5V to 30V, and can deliver an output current up to 2A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The 600kHz pseudo-constant switching frequency enables using small external inductor and capacitor values.

The SY21213 uses advanced constant on-time and ripple-based control strategy to achieve fast transient response for applications with high step-down ratios, and high efficiency at light loads. It also provides cycle-bycycle current limit protection, output under voltage protection and over temperature protection.

Only the input and output capacitors, inductor, feedback resistor divider and feedforward capacitor need to be selected for the targeted application specifications.

The SY21213 is available in a compact SOT23-6 package.