LT3433 Datasheet | Linear Technology

LT3433 High Voltage Step-Up/Step-Down DC/DC Converter .. Features s s s s s s s s s s s s s s DESCRIPTIO U APPLICATIO S s s s Automatic Step-Up and Step-Down Conversion Uses a Single Inductor Wide 4V to 60V Input Voltage Range VOUT from 3.3V to 20V Dual Internal 500m A Switches 100µA No-Load Quiescent Current Low Current Shutdown ±1% Output Voltage Accuracy 200k Hz Operating Frequency Boosted Supply Pin to Saturate High Side Switch Frequency Foldback Protection Current Limit Foldback Protection Current Limit Unaffected by Duty Cycle 16-lead Thermally Enhanced TSSOP Package The LT®3433 is a 200k Hz fixed-frequency current mode switching regulator that provides both step-up and stepdown regulation using a single inductor. The IC operates over a 4V to 60V input voltage range making it suitable for use in various wide input voltage range applications such as automotive electronics that must withstand both load dump and cold crank conditions. Internal control circuitry monitors system conditions and converts from single switch buck operation to dual switch bridged operation when required, seamlessly changing between step-down and step-up voltage conversion. Optional Burst Mode® operation reduces no-load quiescent current to 100µA and maintains high efficiencies with light loads. Current limit foldback and frequency foldback help prevent inductor current runaway during start-up. Programmable soft-start helps prevent output overshoot at start-up. The LT3433 is available in a 16-lead thermally enhanced TSSOP package. 12V Automotive Systems Wall Adapter Powered Systems Battery Power Voltage Buffering , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. U.S. patent number: 5731694 TYPICAL APPLICATIO 4V to 60V to 5V DC/DC Converter with Burst Mode Operation 1N4148 VIN 2.2µF 0.01µF 330p F VIN SHDN SS VC 68k 1n F BURST_EN SWL VOUT 1N4148 VBIAS VFB 100k 3433...