LT3682 Datasheet | Linear Technology

LT3682 1A Micropower Step-Down Switching Regulator Features n DESCRIPTION The LT®3682 is an adjustable frequency (250k Hz to 2.2MHz) monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 0.5Ω switch is included on the device along with a boost diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. A SYNC pin allows the user to synchronize the part to an external clock, and to choose between Low Ripple Burst Mode operation and standard PWM operation. The Low Ripple Burst Mode maintains high efficiency at low output currents while keeping output ripple below 15m V in typical applications. 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 flag signals when VOUT reaches 90% of the programmed output voltage. Protection circuitry senses the current in the power switch and external Schottky catch diode to protect the LT3682 against short-circuit conditions. Frequency foldback and thermal shutdown provide additional protection. The LT3682 is available in a 12-Pin 3mm × 3mm DFN with exposed pad for low thermal resistance. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n n n n n n n n n n Wide Input Range: Operation from 3.6V to 36V Overvoltage Lockout Protects Circuits through 60V Transients 1A Output Current Low Ripple Burst Mode® Operation IQ = 75μA at 12VIN to 3.3VOUT Output Ripple < 15m VP-P Adjustable Switching Frequency: 250k Hz to 2.2MHz Short-Circuit Protected Synchronizable Between 300k Hz and 2.2MHz 0.8V Feedback Reference Voltage Output Voltage 0.8V to 20V Soft-Start Capability Power Good Flag Small 12-Pin Thermally Enhanced 3mm × 3mm DFN Package APPLICATIONS Au...