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LT3505EMS8E Datasheet(PDF) 1 Page - Linear Technology |
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LT3505EMS8E Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3505 1 3505fc TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 1.2A, Step-Down Switching Regulator in 3mm × 3mm DFN The LT®3505 is a current mode PWM step-down DC/DC converter with an internal 1.4A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3505 ideal for regulating power from a wide variety of sources, including unregulated wall transform- ers, 24V industrial supplies and automotive batteries. The oscillatorcanbeprogrammedforhighfrequencyoperation allowing the use of tiny, low cost external components or it can be programmed for lower frequency operation to maximize efficiency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The low current (<2µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. 750kHz, 3.3V Step-Down Converter , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ! Wide Input Range: 3.6V to 36V Operating, 40V Maximum ! Up to 1.2A Output Current ! Resistor-Programmable Fixed-Frequency Operation from 200kHz to 3MHz ! Output Adjustable Down to 780mV ! Short-Circuit Robust ! Uses Tiny Capacitors and Inductors ! Soft-Start ! Low Shutdown Current: <2µA ! Low VCESAT Switch: 350mV at 1A ! Thermally Enhanced, Low Profile 3mm x 3mm DFN-8 and MSOP-8 Packages ! Automotive Battery Regulation ! Industrial Control Supplies ! Wall Transformer Regulation ! Distributed Supply Regulation ! Battery-Powered Equipment VIN 4.2V TO 36V ON OFF 0.1 µF 10µH 36.5k 10 µF 3505 TA01 22pF 68pF 1 µF 75.0k 11.3k VOUT 3.3V 1.1A, VIN > 5V 1.2A, VIN > 8V 69.8k GND BOOST FB VC SW LT3505 VIN SHDN RT Efficiency LOAD CURRENT (A) 70 80 60 50 0.4 0.8 1.2 0.2 0 0.6 1.0 90 65 75 55 85 VIN = 12V VOUT = 3.3V fSW = 750kHz L = 10 H |
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