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LT1959 - 4.5A, 500kHz Step-Down Switching Regulator

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 LT1959 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.

Features Operates with Input as Low as 4V Output Range Down to 1.21V Constant 500kHz Switching Frequency Uses All Surface Mount Components Inductor Size Reduced to 1.8µH Saturating Switch Design: 0.07 Ohms Shutdown Current: 20µA Easily Synchronizable Cycle-by-Cycle Current Limiting 4.5A Switch Current Mode Control Typical Application

Applications Portable Computers Battery-Powered Systems Battery Chargers Distributed Power 5V to 3.3V Conversion 5V to 2.5V Conversion 5V to 1.8V Conversion Packaging

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