• ·       Low R_DS(ON) for Internal MOSFETs: 500mΩ Top, 240mΩ Bottom
• ·       7V to 100V Input Voltage Range
• ·       Up to 1A Output Current Capability
• ·       Adjustable Switching Frequency
• ·       COT Ripple-Based Control to Achieve Fast Transient Responses
• ·       2ms Internal Soft-start Limits the Inrush Current
• ·       Precise ±2% 1.2V Reference
• ·       Output Short Circuit Protection
• ·       Cycle-by-Cycle Peak and Valley Current Limit
• ·       Over Temperature Protection
• ·       Output Auto-Discharge Function
• ·       RoHS Compliant and Halogen Free
• ·       Compact Package: SO8E

The SY21051 high-efficiency synchronous Buck converter can deliver 1A output current over a wide input voltage range from 7V to 100V. The SY21051 employs a constant on-time and ripple-based control strategy to achieve fast transient responses. The SY21051 integrates the top FET and bottom FET with very low R_DS(ON) to minimize the conduction loss.

Silergy’s constant on-time (COT) ripple-based control method supports high input/output voltage ratios (low duty cycles), and fast transient response while maintaining a near constant operating frequency over line, load, and output voltage ranges. This control method provides stable operation without complex compensation and even with low ESR ceramic capacitors.

The SY21051 also provides cycle-by-cycle current limit, over temperature protection, and output short circuit protection.

The SY21051 is available in a compact SO8E package.