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LT1912EMSE-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT1912EMSE-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LT1912 1 1912f TYPICAL APPLICATION APPLICATIONS 36V, 2A, 500kHz Step-Down Switching Regulator The LT®1912 is an adjustable frequency (200kHz to 500kHz) monolithic step-down switching regulator that accepts input voltages up to 36V. A high efficiency 0.25Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic cir- cuitry. Current mode topology is used for fast transient response and good loop stability. The LT1912 allows the use of ceramic capacitors resulting in low output ripple while keeping total solution size to a minimum. The low current shutdown mode 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). The LT1912 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance. ■ Automotive Battery Regulation ■ Set Top Box ■ Distributed Supply Regulation ■ Industrial Supplies ■ Wall Transformer Regulation 3.3V Step-Down Converter SW FB VC RT VIN BD VIN 4.5V TO 36V VOUT 3.3V 2A 4.7μF 0.47μF 470pF 47μF 100k 20k 68.1k 6.8μH 316k GND OFF ON LT1912 1912 TA01 RUN/SS BOOST SYNC Efficiency LOAD CURRENT (A) 0 50 0.5 1.0 1.5 2 1912 TA01b 60 100 90 80 70 VIN = 12V L = 6.8μF F = 500kHz VOUT = 3.3V VOUT = 5V , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Wide Input Range: Operation From 3.6V to 36V ■ 2A Maximum Output Current ■ Adjustable Switching Frequency: 200kHz to 500kHz ■ Low Shutdown Current: IQ < 1μA ■ Integrated Boost Diode ■ Synchronizable Between 250kHz to 500kHz ■ Saturating Switch Design: 0.25Ω On-Resistance ■ 0.790V Feedback Reference Voltage ■ Output Voltage: 0.79V to 20V ■ Soft-Start Capability ■ Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages FEATURES DESCRIPTION |
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