LT1912 36V, 2A, 500kHz Step-Down Switching Regulator FEATURESDESCRIPTION ■ Wide Input Range: Operation From 3.6V to 36V The LT®1912 is an adjustable frequency (200kHz to 500kHz) ■ 2A Maximum Output Current monolithic step-down switching regulator that accepts ■ Adjustable Switching Frequency: 200kHz to 500kHz input voltages up to 36V. A high efficiency 0.25Ω switch ■ Low Shutdown Current: IQ < 1µA is included on the die along with a boost Schottky diode ■ Integrated Boost Diode and the necessary oscillator, control and logic circuitry. ■ Synchronizable Between 250kHz to 500kHz Current mode topology is used for fast transient response ■ Saturating Switch Design: 0.25Ω On-Resistance and good loop stability. The LT1912 allows the use of ■ 0.790V Feedback Reference Voltage ceramic capacitors resulting in low output ripple while ■ Output Voltage: 0.79V to 20V keeping total solution size to a minimum. The low current ■ Soft-Start Capability shutdown mode reduces input supply current to less than ■ Small 10-Pin Thermally Enhanced MSOP and 1µA while a resistor and capacitor on the RUN/SS pin (3mm × 3mm) DFN Packages provide a controlled output voltage ramp (soft-start). The LT1912 is available in 10-pin MSOP and 3mm × 3mm DFN APPLICATIONS packages with exposed pads for low thermal resistance. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the ■ Automotive Battery Regulation property of their respective owners. ■ Set-Top Box ■ Distributed Supply Regulation ■ Industrial Supplies ■ Wall Transformer Regulation TYPICAL APPLICATION3.3V Step-Down ConverterEfficiency VIN V 100 4.5V TO 36V OUT 3.3V V 2A V IN BD OUT = 5V 90 OFF ON RUN/SS BOOST VOUT = 3.3V 0.47µF 80 20k 6.8µH VC LT1912 SW 4.7µF R 70 T 470pF EFFICIENCY (%) 316k 60 68.1k SYNC FB VIN = 12V GND L = 6.8µF 100k 47µF 50 F = 500kHz 0 0.5 1.0 1.5 2 LOAD CURRENT (A) 1912 TA01 1912 TA01b 1912fa 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
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