LT1936 Datasheet | Linear Technology

LT1936 1.4A, 500k Hz Step-Down Switching Regulator .. Features - - - - - - - - - - - - - - DESCRIPTION The LT®1936 is a current mode PWM step-down DC/DC converter with an internal 1.9A power switch, packaged in a tiny, thermally enhanced 8-lead MSOP . The wide input range of 3.6V to 36V makes the LT1936 suitable for regulating power from a wide variety of sources, including automotive batteries, 24V industrial supplies and unregulated wall adapters. Its high operating frequency allows the use of small, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple. Cycle-by-cycle current limit, frequency foldback and thermal shutdown provide protection against shorted outputs, and soft-start eliminates input current surge during start-up. Transient response can be optimized by using external pensation ponents, or board space can be minimized by using internal pensation. The low current (<2μA) shutdown mode enables 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. Wide Input Range: 3.6V to 36V Short-Circuit Protected Over Full Input Range 1.9A Guaranteed Minimum Switch Current 5V at 1.4A from 10V to 36V Input 3.3V at 1.4A from 7V to 36V Input 5V at 1.2A from 6.3V to 36V Input 3.3V at 1.2A from 4.5V to 36V Input Output Adjustable Down to 1.20V 500k Hz Fixed Frequency Operation Soft-Start Uses Small Ceramic Capacitors Internal or External pensation Low Shutdown Current: <2μA Thermally Enhanced 8-Lead MSOP Package APPLICATIONS - - - Automotive Battery Regulation Industrial Control Supplies Unregulated Wall Adapters TYPICAL APPLICATION 3.3V Step-Down Converter 95 VIN 4.5V TO 36V VIN ON OFF 4.7μF SHDN LT1936 17.4k P VC FB GND 10k 22μF BOOST SW 0.22μF 10μH EFFICIENCY (%) VOUT 3.3V 1.2A 90 85 VOUT = 3.3V 80 75 70 1936 TA01a Efficiency VIN = 12V VOUT = 5V 0.5 1...