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LT3481HMSE-TR Datasheet(PDF) 1 Page - Linear Technology |
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LT3481HMSE-TR Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3481 1 3481fb 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Current The LT®3481 is an adjustable frequency (300kHz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum). A high efficiency 0.18 Ω 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. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3481 can fur- ther enhance low output current efficiency by drawing bias current from the output when VOUT is above 3V. 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. The LT3481 is available in 10-Pin MSOP and 3mm x 3mm DFN packages with exposed pads for low thermal resistance. ■ Automotive Battery Regulation ■ Power for Portable Products ■ Distributed Supply Regulation ■ Industrial Supplies ■ Wall Transformer Regulation ■ Wide Input Range: 3.6V to 34V Operating, 36V Maximum ■ 2A Maximum Output Current ■ Low Ripple Burst Mode® Operation 50μA IQ at 12VIN to 3.3VOUT Output Ripple < 15mV ■ Adjustable Switching Frequency: 300kHz to 2.8MHz ■ Low Shutdown Current: IQ < 1μA ■ Integrated Boost Diode ■ Power Good Flag ■ Saturating Switch Design: 0.18 Ω On-Resistance ■ 1.265V Feedback Reference Voltage ■ Output Voltage: 1.265V to 20V ■ Soft-Start Capability ■ Synchronizable Between 275kHz to 475kHz ■ Small 10-Pin Thermally Enhanced MSOP and (3mm x 3mm) DFN Packages 3.3V Step-Down Converter SW BIAS FB VC PG RT VIN BD VIN 4.5V TO 34V VOUT 3.3V 2A 4.7μF 0.47μF 330pF 22μF 200k 16.2k 60.4k 4.7μH 324k GND OFF ON LT3481 3481 TA01 RUN/SS BOOST Efficiency , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LOAD CURRENT (A) 0.0001 40 30 0.001 0.01 0.1 1 10 3481 TA01b 60 50 90 80 70 0.1 0.01 10.0 1.0 10000.0 1000.0 100.0 VIN = 12V VOUT = 3.3V L = 4.7μ F = 800 kHz TYPICAL APPLICATION DESCRIPTION FEATURES APPLICATIONS |
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