Typical applications

description

The LT3684 is an adjustable frequency (300kHz to 2.8MHz) monolithic step-down switching regulator that accepts input voltages up to 34V (36V maximum). With a boost Schottky diode and the necessary oscillator, the control and logic chips contain a high efficiency 0.18Ω switch. Current mode topologies for fast transient response and good loop stability. The LT3684's high operating frequency allows the use of small, low cost inductors and low output ripple while maintaining the smallest ceramic capacitors in the overall solution size. A low-current shutdown mode reduces input supply current to less than 1μA, while resistors and capacitors on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signal is V_OUTUp to 90% of the programmed output voltage. The LT3684 is a 3mm × 3mm DFN package with 10-lead MSOP and low thermal resistance exposed pads.