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LT3581 Datasheet(PDF) 1 Page - Linear Technology |
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LT3581 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LT3581 3581f Typical applicaTion DescripTion 3.3A Boost/Inverting DC/DC Converter with Fault Protection The LT®3581 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltages, and overtemperature conditions. The part consists of a 42V master switch, and a 42V slave switch that can be tied together for a total current limit of 3.3A. The LT3581 is ideal for many local power supply designs. It canbeeasilyconfiguredinBoost,SEPIC,InvertingorFlyback configurations, and is capable of generating 12V at 830mA, or –12V at 625mA from a 5V input. In addition, the LT3581’s slave switch allows the part to be configured in high voltage, high power charge pump topologies that are very efficient and require fewer components than traditional circuits. TheLT3581’sswitchingfrequencyrangecanbesetbetween 200kHz and 2.5MHz. The part may be clocked internally at a frequency set by the resistor from the RT pin to ground, or it may be synchronized to an external clock. A buffered version of the clock signal is driven out of the CLKOUT pin, and may be used to synchronize other compatible switching regulator ICs to the LT3581. The LT3581 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjust- able undervoltage lockout function. Additional features such as frequency foldback and soft-start are integrated. The LT3581 is available in 14-Pin 4mm × 3mm DFN and 16-Lead MSE packages. Output Short Protected, 5V to 12V Boost Converter Operating at 2MHz FeaTures applicaTions n 3.3A, 42V Combined Power Switch n Master/Slave (1.9A/1.4A) Switch Design n Output Short Circuit Protection n Wide Input Range: 2.5V to 22V Operating, 40V Maximum Transient n Switching Frequency Up to 2.5MHz n Easily Configurable as a Boost, SEPIC, Inverting or Flyback Converter n User Configurable Undervoltage Lockout n Low VCESAT Switch: 250mV at 2.75A (Typical) n Can be Synchronized to External Clock n Can Be Synchronized to other Switching Regulators n High Gain SHDN Pin Accepts Slowly Varying Input Signals n 14-Pin 4mm × 3mm DFN and 16-Lead MSE Packages n Local Power Supply n Vacuum Fluorescent Display (VFD) Bias Supplies n TFT-LCD Bias Supplies n Automotive Engine Control Unit (ECU) Power L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7579816. VIN 5V VIN 6.04k 100k 130k 43.2k 4.7µF 1.5µH 1nF 3581 TA01 0.1µF 4.7µF 10.5k 4.7µF VOUT 12V 830mA SW1 SW2 FB CLKOUT GATE VC SS VIN RT GND SYNC FAULT SHDN LT3581 56pF 18.7k 10k LOAD CURRENT (mA) 0 50 55 65 70 75 400 100 95 3581 TA01b 60 200 1000 800 600 80 85 90 0 200 600 2000 1200 1400 1600 1800 400 800 1000 Efficiency and Power Loss vs Load Current |
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