LT3970 Datasheet | Linear Technology

LT3970 Series 40V, 350m A Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes Features n Low Ripple Burst Mode® Operation n 2.5µA IQ at 12VIN to 3.3VOUT n Output Ripple < 5m VP-P n Wide Input Voltage Range: 4.2V to 40V Operating n Adjustable Switching Frequency: 200k Hz to 2.2MHz n Integrated Boost and Catch Diodes n 350m A Output Current n Fixed Output Voltages: 3.3V, 3.42V, 5V 1.8µA IQ at 12VIN n Accurate 1V Enable Pin Threshold n Low Shutdown Current: IQ = 0.7µA n Internal Sense Limits Catch Diode Current n Power Good Flag n Output Voltage: 1.21V to 25V n Internal pensation n Small 10-Pin MSOP and (3mm × 2mm) DFN Packages n AEC-Q100 Qualified for Automotive Applications APPLICATIONS n Automotive Battery Regulation n Power for Portable Products n Industrial Supplies DESCRIPTION The LT®3970 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V, and consumes only 2.5µA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5m V in a typical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An enable pin with accurate threshold is available, producing a low shutdown current of 0.7µA. A power good flag signals when VOUT reaches 90% of the programmed output voltage. The LT3970 is available in small 10-pin MSOP and 3mm × 2mm DFN packages. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION 5V Step-Down Converter VIN 6V TO 40V OFF ON VIN BOOST LT3970 2.2µF GND 226k f = 600k Hz 0.22µF 22µH 22p F VOUT 5V 350m A 1M 22µF 316k 3490...