NCP1571 Low Voltage Synchronous Buck Controller
The NCP1571 is a low voltage buck controller. It provides the
control for a DC?DC power solution producing an output voltage as
low as 0.980 V over a wide current range. The NCP1571?based
solution is powered from 12 V with the output derived from a 2?7 V
supply. It contains all required circuitry for a synchronous NFET buck
regulator using the V2 control method to achieve the fastest possible
transient response and best overall regulation. NCP1571 operates at a
fixed 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. During
undervoltage lockout, the NCP1571 controller allows the power
supply output to drift down, allowing the load time to shut off. This
operation 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