The LT1506 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1374 but optimized for lower input voltage applications. It will operate over a 4V to 15V input range compared with 5.5V to 25V for the LT1374. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available. A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by keeping quiescent supply current to 4mA and by utilizing a supply boost capacitor to saturate the power switch. The LT1506 fits into standard 7-pin DD and fused lead SO-8 packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20µA. Synchronization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz. Applications * Portable Computers * Battery-Powered Systems * Battery Charger * Distributed Power * Constant 500kHz Switching Frequency * Easily Synchronizable * Operates with Input as Low as 4V * Uses All Surface Mount Components * Inductor Size Reduced to 1.8µH * Saturating Switch Design: 0.07Ω * Shutdown Current: 20µA * Cycle-by-Cycle Current Limiting https://elecena.pl/product/377709/4-5a-500khz-step-down-switching-regulator 2007-04-23 https://elecena.pl/product/377709/4-5a-500khz-step-down-switching-regulator 2014-05-15 https://elecena.pl/product/377709/4-5a-500khz-step-down-switching-regulator 2025-01-21