LT3972 pdf datasheet (Step-Dow

The LT®3972 is an adjustable frequency (200kHz to 2.4MHz)
monolithic buck switching regulator that accepts input
voltages up to 33V (62V Maximum). A high effi ciency
95mΩ switch is included on the die along with a boost
Schottky diode and the necessary oscillator, control, and
logic circuitry. Current mode topology is used for fast
transient response and good loop stability. Low ripple
Burst Mode operation maintains high effi ciency at low
output currents while keeping output ripple below 15mV
in a typical application. In addition, the LT3972 can further
enhance low output current effi ciency by drawing
bias current from the output when VOUT is above 3V.
Shutdown reduces input supply current to less than 1μA
while a resistor and capacitor on the RUN/SS pin provide a
controlled output voltage ramp (soft-start). A power good
fl ag signals when VOUT reaches 91% of the programmed
output voltage. The LT3972 is available in 10-Pin MSOP
and 3mm × 3mm DFN packages with exposed pads for
low thermal resistance.