LT3684 Datasheet | Linear Technology

LT3684 36V, 2A, 2.8MHz Step-Down Switching Regulator Features - - - - - - - - - - - DESCRIPTION The LT®3684 is an adjustable frequency (300k Hz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum). A high efficiency 0.18Ω 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. The LT3684’s high operating frequency allows the use of small, low cost inductors and ceramic capacitors resulting in low output ripple while keeping total solution size to a minimum. The low current shutdown mode 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 flag signals when VOUT reaches 90% of the programmed output voltage. The LT3684 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with Exposed Pads for low thermal resistance. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Wide Input Range: 3.6V to 34V Operating, 36V Maximum 2A Maximum Output Current Adjustable Switching Frequency: 300k Hz to 2.8MHz Low Shutdown Current: IQ < 1µA Integrated Boost Diode Power Good Flag Saturating Switch Design: 0.18Ω On-Resistance 1.265V Feedback Reference Voltage Output Voltage: 1.265V to 20V Soft-Start Capability Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages APPLICATIONS - - - - - Automotive Battery Regulation Power for Portable Products Distributed Supply Regulation Industrial Supplies Wall Transformer Regulation .. TYPICAL APPLICATION 3.3V Step-Down Converter Efficiency VOUT 3.3V 2A 0.47µF VC LT3684 330p F RT PG 60.4k GND BIAS 324k FB 200k 22µF 40 30 0 0.5 1 1.5 LOAD CURRENT (A) 2 3684 TA01b VIN 4.5V TO 34V VIN OFF ON 16.2k 4.7µF SW RUN/SS BD BOOST...