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SY21051 - Synchronous Buck Converter

Datasheet Summary

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.

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.

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Datasheet preview – SY21051

Datasheet Details

Part number SY21051
Manufacturer Silergy
File Size 1.39 MB
Description Synchronous Buck Converter
Datasheet download datasheet SY21051 Datasheet
Additional preview pages of the SY21051 datasheet.

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Full PDF Text Transcription

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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.
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