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General Description
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 RDS(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.