The LTC?3608 is a high effi ciency, monolithic synchronous
step-down DC/DC converter that can deliver up to 8A output
current from a 4V to 18V (20V maximum) input supply. It
uses a valley current control architecture to deliver very
low duty cycle operation at high frequency with excellent
transient response. The operating frequency is selected
by an external resistor and is compensated for variations
in VIN and VOUT.
The LTC3608 can be confi gured for discontinuous or
forced continuous operation at light load. Forced continuous
operation reduces noise and RF interference while
discontinuous mode provides high effi ciency by reducing
switching losses at light loads.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and an optional
short-circuit shutdown timer. Soft-start capability for supply
sequencing is accomplished using an external timing
capacitor. The regulator current limit is user programmable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3608 is available in a
compact 7mm × 8mm QFN package.