LT3663 Datasheet | Linear Technology

.. LT3663 1.2A, 1.5MHz Step-Down Switching Regulator with Output Current Limit DESCRIPTION The LT®3663 is a 1.5MHz current mode step-down switching regulator with programmable output current limit. The current limit accurately controls the system power dissipation and reduces the size of the power path ponents. The wide operating input voltage range of 7.5V to 36V (60V transient) suits the LT3663 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, and automotive power. The LT3663 includes a low current shutdown mode, input overvoltage and undervoltage lockout, and thermal shutdown. Internal pensation and boost diode minimize the number of external exponents. The LT3663 is available in an 8-lead (2mm × 3mm) package with an exposed pad for low thermal resistance. 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. Features n n n n n n n n Wide Input Range: Operation from 7.5V to 36V Overvoltage Lockout Protects Circuit through 60V Transients Programmable Output Current Limit (0.4A to 1.2A) Integrated Boost Diode 1.5MHz Fixed Frequency, Peak Current Mode Control Low Switch VCESAT: 275m V at 1A Internally pensated Thermal Protection Thermally Enhanced 2mm × 3mm DFN Package APPLICATIONS n n n n Distributed Supply Regulation Automotive Battery Regulation Industrial Supplies Wall Transformer Regulation TYPICAL APPLICATION 5V Step-Down Converter 100 VIN 2.2μF VIN BOOST LT3663 SW ON OFF RUN ISENSE ILIM 28.7k FB GND 3663 TA01 Efficiency 0.1μF EFFICIENCY (%) 90 80 70 60 50 40 0.1 VIN = 8V VIN = 15V VIN = 30V 6.8μH VOUT 59k 22μF VOUT 11k 0.5 0.7 0.9 OUTPUT CURRENT (A) 3663 TA01b 3663f .. (Note...