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LT3970IDDB-3.3-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3970IDDB-3.3-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 22 page LT3970/LT3970-3.3/LT3970-5 1 3970fa TYPICAL APPLICATION DESCRIPTION 40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes 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 neces- sary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV 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. 5V Step-Down Converter FEATURES APPLICATIONS n Low Ripple Burst Mode® Operation 2.5μA IQ at 12VIN to 3.3VOUT Output Ripple < 5mVP-P n Wide Input Voltage Range: 4.2V to 40V Operating n Adjustable Switching Frequency: 200kHz to 2.2MHz n Integrated Boost and Catch Diodes n 350mA Output Current n Fixed Output Voltages: 3.3V, 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 Compensation n Small 10-Pin MSOP and (3mm × 2mm) DFN Packages n Automotive Battery Regulation n Power for Portable Products n Industrial Supplies VIN BOOST LT3970 SW EN PG RT 0.22μF 22pF 22μF 2.2μF VIN 6V TO 40V VOUT 5V 350mA 1M 316k 226k f = 600kHz 22μH BD FB GND OFF ON 3490 TA01a Efficiency L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LOAD CURRENT (mA) 50 70 90 40 60 80 0.01 1 10 100 3970 TA01b 1 10 100 1000 0.01 0.1 0.1 VIN = 12V |
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