LT3493 Datasheet | Linear Technology

Features n Wide Input Range: 3.6V to 36V Operating, 40V Maximum n 1.2A Output Current n Fixed Frequency Operation: 750k Hz n Output Adjustable Down to 780m V n Short-Circuit Robust n Uses Tiny Capacitors and Inductors n Soft-Start n Internally pensated n Low Shutdown Current: <2μA n Low VCESAT Switch: 330m V at 1A n Thermally Enhanced, Low Profile DFN Package APPLICATIONS n Automotive Battery Regulation n Industrial Control Supplies n Wall Transformer Regulation n Distributed Supply Regulation n Battery-Powered Equipment 1.2A, 750k Hz Step-Down Switching Regulator in 2mm × 3mm DFN DESCRIPTION The LT®3493 is a current mode PWM step-down DC/DC converter with an internal 1.75A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3493 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple. 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. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION VIN 4.2V TO 36V ON OFF 3.3V Step-Down Converter BOOST SHDN GND FB 1μF 0.1μF 10μH 32.4k 10k VOUT 3.3V 1.2A, VIN > 12V 0.95A, VIN > 5V 22p F 10μF 3493 TA01a EFFICIENCY (%) Efficiency 60 VIN = 12V 55 VOUT = 3.3V L = 10μH 50 0 0.2 0.4 0.6 0.8 LOAD CURRENT (A) 1.0 1.2 3493...