LT3502A Datasheet | Linear Technology

.. Features - - - LT3502/LT3502A 1.1MHz/2.2MHz, 500m A Step-Down Regulators in 2mm × 2mm DFN and MS10 DESCRIPTION The LT®3502/LT3502A are current mode PWM step-down DC/DC converters with an internal 500m A power switch, in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10 packages. The wide input voltage range of 3V to 40V makes the LT3502/LT3502A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capacitors, resulting in a very small solution. Constant frequency above the AM band avoids interfering with radio reception, making the LT3502A particularly suitable for automotive applications. Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminates input current surge during start-up. DA current sense provides further protection in fault conditions. An internal boost diode reduces ponent count. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. - - - - - - - 3V to 40V Input Voltage Range 500m A Output Current Switching Frequency: 2.2MHz (LT3502A), 1.1MHz (LT3502) 800m V Feedback Voltage Short-Circuit Robust Soft-Start Low Shutdown Current: <2μA Internally pensated Internal Boost Diode Thermally Enhanced 2mm × 2mm 8-Lead DFN and 10-lead MS10 Package APPLICATIONS - - - - Automotive Systems Battery-Powered Equipment Wall Transformer Regulation Distributed Supply Regulation TYPICAL APPLICATION 3.3V Step-Down Converter 90 VIN 4.7V TO 40V BD VIN 1μF SW LT3502A DA OFF ON SHDN GND 31.6k FB 10k 10μF BOOST EFFICIENCY (%) 0.1μF 6.8μH VOUT 3.3V 500m A 80 5VOUT 70 60 50 40 30 20 10 3502 TA01a LT3502A 12VIN Efficiency 3.3VOUT 0 0 0.1 0.3 0.2 LOAD CURRENT (A) 0.4 0.5 3502 TA01b 3502fc .. LT3502/LT3502A (Note 1) ABSOLUTE...