Dual Out-of-Phase SynchronousBuck Controller with Remote Sense

Overview

The CS5421 is a dual N-channel synchronous buck regulator controller. It contains all the circuitry required for two independent buck regulators and utilizes the V2™ control method to achieve the fastest possible transient response and best overall regulation, while using the least number of external components. The CS5421 features out-of-phase synchronization between the channels, reducing the input filter requirement. The CS5421 also provides undervoltage lockout, soft start, built in adaptive FET non-overlap and remote sense capability. The part is available in a 16 Lead SO Narrow package allowing the designer to minimize solution size.

  • V2™ Control Topology
  • 150ns Transient Response
  • Programmable Soft Start
  • 25ns Gate Rise and Fall Times (with 1.0 nF load)
  • 40ns Adaptive FET Nonoverlap Time
  • 100% Duty Cycle for Enhanced Transient Response
  • Internal Slope Compensation
  • 1V 0.8% and 2.0% Error Amplifier References
  • 150kHz to 750kHz Fixed Frequency Operation
  • Switching Frequency Set by Single Resistor
  • Out-Of-Phase Synchronization Between the Channels Reduces the Input Filter Requirement
  • Undervoltage Lockout
  • On/Off Control Through Use of the COMP Pins

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