LT1933 Datasheet | Linear Technology

Features n Wide Input Range: 3.6V to 36V n 5V at 600m A from 16V to 36V Input n 3.3V at 600m A from 12V to 36V Input n 5V at 500m A from 6.3V to 36V Input n 3.3V at 500m A from 4.5V to 36V Input n Fixed Frequency 500k Hz Operation n Uses Tiny Capacitors and Inductors n Soft-Start n Internally pensated n Low Shutdown Current: <2μA n Output Adjustable Down to 1.25V n Low Profile (1mm) SOT-23 (Thin SOT™) and (2mm × 3mm × 0.75mm) 6-Pin DFN Packages APPLICATIONS n Automotive Battery Regulation n Industrial Control Supplies n Wall Transformer Regulation n Distributed Supply Regulation n Battery-Powered Equipment 600m A, 500k Hz Step-Down Switching Regulator in SOT-23 and DFN Packages DESCRIPTION The LT®1933 is a current mode PWM step-down DC/DC converter with an internal 0.75A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 36V makes the LT1933 suitable 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 provides output disconnect, enabling easy power management in battery-powered systems. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION VIN 4.5V TO 36V OFF ON 3.3V Step-Down Converter BOOST SHDN 16.5k 1N4148 0.1μF 22μH MBRM140 2.2μF 10k VOUT 3.3V/500m A 22μF 1933 TA01a EFFICIENCY (%) Efficiency 95 VIN = 12V 90 VOUT = 5V 85 VOUT = 3.3V 80 65 0 100 200 300 400 500 600 LOAD CURRENT (m A) 1933...