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