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RT2855B - Synchronous Step-Down Converter

Download the RT2855B datasheet PDF. This datasheet also covers the RT2855A variant, as both devices belong to the same synchronous step-down converter family and are provided as variant models within a single manufacturer datasheet.

General Description

The RT2855A/B are high-performance 650kHz 4A stepdown regulators with internal power switches and synchronous rectifiers.

Key Features

  • a power-saving discontinuous operating mode at light loads. Features.
  • Fast Transient Response.
  • Steady 650kHz Switching Frequency at all Load Current (RT2855B).
  • Discontinuous operating mode at Light Load (RT2855A).
  • 4A Output Current.
  • Advanced Constant On-Time (ACOT®) Control.
  • Optimized for Ceramic Output Capacitors.
  • 4.5V to 18V Input Voltage Range.
  • Internal 70mΩ Switch and 30mΩ Synchronous Rectifier.
  • 0.765V to 7V Adjustable Output Voltage.
  • Externa.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (RT2855A-Richtek.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number RT2855B
Manufacturer Richtek
File Size 275.90 KB
Description Synchronous Step-Down Converter
Datasheet download datasheet RT2855B Datasheet

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Other Datasheets by Richtek

Part Number Description
RT2855A Synchronous Step-Down Converter
RT2852BH Synchronous Step-Down Converter
RT2853A Synchronous Step-Down Converter
RT2853B Synchronous Step-Down Converter
RT2856 Synchronous Step-Down Converter

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.

View original datasheet text
® RT2855A/B 4A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter General Description The RT2855A/B are high-performance 650kHz 4A stepdown regulators with internal power switches and synchronous rectifiers. They feature quick transient response using theirAdvanced Constant On-Time (ACOT®) control architecture that provides stable operation with small ceramic output capacitors and without complicated external compensation, among other benefits. The input voltage range is from 4.5V to 18V and the output is adjustable from 0.765V to 7V. The proprietary ACOT®control improves upon other fastresponse constant on-time architectures, achieving nearly constant switching frequency over line, load, and output voltage ranges.