LT3694-1

FEATURES n Wide Input Range: 4V to 36V n Overvoltage Shutdown Protects Circuit Through 70V Transients n 2.6A Output Switching Regulator with Internal Power Switch n Dual, Low Dropout, Linear Regulator Controllers with Programmable Current Limit n Tracking/Soft-Start Inputs and Power Good Output Simplify Soft-Start and Supply Sequencing n Uses Small Inductors and Ceramic Capacitors n VOUT(MIN) = 0.75V (Buck and LDOs) n Adjustable 250kHz to 2.5MHz Switching Frequency n Accurate Enable Threshold Allows User Programmable Undervoltage Lockout n Options for Clock Synchronization (LT3694) or Clock Output to Enable Synchronization to Other Switching Regulators (LT3694-1) n Thermally Enhanced 28-Lead 4mm × 5mm QFN and 20-Lead TSSOP Packages APPLICATIONS n Automotive n Industrial n DSL and Cable Modems n Distributed Power Regulation n Wall Transformer Regulation LT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO DESCRIPTION The LT®3694/LT3694-1 are monolithic, current mode DC/DC converters with dual, low dropout regulator controllers. The switching converter is a step-down converter capable of generating up to 2.6A at its output. Each regulator has independent track/soft-start circuits simplifying power supply sequencing and interfacing with microcontrollers and DSPs. The switching frequency is set with a single resistor with a range of 250kHz to 2.5MHz. The high switching frequency permits the use of small inductors and ceramic capacitors leading to very s...