3.3V High Efficiency Step-Down Switching Regulator Controller

The LT1432-3.3 is a control chip designed to operate with the LT1171 LT1271 family of Switching Regulators to make a very high efficiency 3.3V Step-down (buck) switch- ing Regulator A minimum of external components is needed. Included is an accurate current limit which uses only 60mV sense voltage and uses free PC board trace material for the sense resistor. Logic controlled electronic shutdown mode draws only 15A battery current. The Switching Regulator operates down to 4.5V input. By Linear Technology Corporation