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NCP1571 Low Voltage Synchronous Buck ControllerThe NCP1571 is a low voltage buck controller. It provides thecontrol for a DC−DC power soluTIon producing an output voltage aslow as 0.980 V over a wide current range. The NCP1571−basedsoluTIon is powered from 12 V with the output derived from a 2−7 Vsupply. It contains all required circuitry for a synchronous NFET buckregulator using the V2 control method to achieve the fastest possibletransient response and best overall regulaTIon. NCP1571 operates at afixed internal 200 kHz frequency and is packaged in an SOIC−8.This device provides undervoltage lockout protecTIon, Soft−Start,Power Good with delay, and built−in adaptive non−overlap. Duringundervoltage lockout, the NCP1571 controller allows the powersupply output to drift down, allowing the load time to shut off. Thisoperation distinguishes the NCP1571 from other parts in its family.Features• Pb−Free Package is Available• 0.980 V ± 1.0% Reference Voltage• V2 Control Topology• 200 ns Transient Response• Programmable Soft−Start• Power Good• Programmable Power Good Delay• 40 ns Gate Rise and Fall Times (3.3 nF Load)• Adaptive FET Non−Overlap Time• Fixed 200 kHz Oscillator Frequency• Undervoltage Lockout Holds Both Gate Outputs Low• On/Off Control Through Use of the COMP Pin• Overvoltage Protection through Synchronous MOSFETs• Synchronous N−Channel Buck Design• Dual Supply, 12 V Control, 2−7 V Power Source
