Dual Out−of−Phase Synchronous Buck Controller with Remote Sense

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.

FEATUREs
• V2 Control Topology
• 150 ns Transient Response
• Programmable Soft Start
• 25 ns Gate Rise and Fall Times (with 1.0 nF load)
• 40 ns Adaptive FET Nonoverlap Time
• 100% Duty Cycle for Enhanced Transient Response
• Internal Slope Compensation
• 1.0 V 0.8% and 2.0% Error Amplifier References
• 150 kHz to 750 kHz Programmable 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