LT1376CS8#PBF

The LT1375/LT1376 are 500kHz monolithic buck mode switching regulators. A 1.5A 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. A shutdown signal will reduce supply current to 20µA on both parts. The LT1375 can be externally synchronized from 580kHz to 900kHz with logic level inputs. The LT1375/LT1376 fit into standard 8-pin PDIP and SO packages, as well as a fused lead 16-pin SO with much lower thermal resistance. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors.

Applications

• Portable Computers
• Battery-Powered Systems
• Battery Charger
• Distributed Power

Key features

• Constant 500kHz Switching Frequency
• Uses All Surface Mount Components
• Inductor Size Reduced to 5µH
• Easily Synchronizable
• Saturating Switch Design: 0.4Ω
• Effective Supply Current: 2.5mA
• Shutdown Current: 20µA
• Cycle-by-Cycle Current Limiting