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The LT®1375/LT1376 are 500kHz monolithic buck modeswitching regulators. A 1.5A switch is included on the diealong with all the necessary oscillator, control and logiccircuitry. High switching frequency allows a considerablereducTIon in the size of external components. The topologyis current mode for fast transient response and good loopstability. Both fixed output voltage and adjustable parts areavailable.A special high speed bipolar process and new designtechniques achieve high efficiency at high switching frequency.Efficiency is maintained over a wide output currentrange by using the output to bias the circuitry and byuTIlizing a supply boost capacitor to saturate the powerswitch. A shutdown signal will reduce supply current to20mA on both parts. The LT1375 can be externally synchronizedfrom 550kHz to 1MHz with logic level inputs.The LT1375/LT1376 fit into standard 8-pin PDIP and SOpackages, as well as a fused lead 16-pin SO with muchlower thermal resistance. Full cycle-by-cycle short-circuitprotecTIon and thermal shutdown are provided.Standard surface mount external parts are used, includingthe inductor and capacitors.
