LT1374IR#PBF

The LT1374 is a 500kHz monolithic buck mode switching regulator. 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 using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. The LT1374 is available in standard 7-pin DD, TO-220, fused lead SO-8 and 16-pin exposed pad TSSOP packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts may be 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 Chargers
• Distributed Power

Key features

• Fixed 500kHz switching frequency
• Available in high-power 16-pin TSSOP package
• All SMT components
• Reduced inductor size to 1.8µH
• Saturating switch design: 0.07Ω
• Active supply current: 2.5mA
• Shutdown current: 20µA
• Cycle-by-cycle current limiting
• Easy synchronization