NCP1575 Low Voltage Synchronous Buck Controller with Adjustable Switching
Frequency
The NCP1575 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. 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. The NCP1575 operates at a default switching
frequency of 200 kHz, but switching frequency is user?programmable
with an additional resistor between ROSC and ground. This device
provides undervoltage lockout protection, soft?start, and built?in
adaptive nonoverlap and is assembled in an SOIC?8 package.
The NCP1575?based solution requires a bias supply of 12 V, and it
can convert from a bulk power supply ranging from 2 V to 12 V.
Conversion from bulk supplies greater than 7 V is best accomplished
by using an external doubler circuit to raise the enhancement voltage
for the external NFET switches.