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SY21051 - Synchronous Buck Converter

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.

Key Features

  • Low RDS(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.

📥 Download Datasheet

Datasheet Details

Part number SY21051
Manufacturer Silergy
File Size 1.39 MB
Description Synchronous Buck Converter
Datasheet download datasheet SY21051 Datasheet

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.