特点
Constant 500kHz Switching Frequency
Easily Synchronizable
Uses All Surface Mount Components
Inductor Size Reduced to 5μH
Saturating Switch Design: 0.4 ohms
Effective Supply Current: 2.5mA
Shutdown Current: 20μA
Cycle-by-Cycle Current Limiting
典型应用
典型应用
描述
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.
For low input voltage applications with 3.3V output, see LT1507. This is a functionally identical part that can operate with input voltages between 4.5V and 12V.