LT1432
FEATURES s s s s s s s s
DESCRIPTIO
Accurate Preset +5V Output Up to 90% Efficiency Optional Burst Mode for Light Loads Can be Used with Many LTC Switching ICs Accurate Ultra-Low-Loss Current Limit Operates with Inputs from 6V to 30V Shutdown Mode Draws Only 15µA Uses Small 50µH Inductor
The LT1432 is a control chip designed to operate with the LT1170/LT1270 family of switching regulators to make a very high efficiency 5V step-down (buck) switching regulator. A minimum of external ponents is needed. Included is an accurate current limit which uses only 60m V sense voltage and uses “free” PC board trace material for the sense resistor. Logic controlled electronic shutdown mode draws only 15µA battery current. The switching regulator operates down to 6V input. The LT1432 has a logic controlled “burst” mode to achieve high efficiency at very light load currents (0 to 100m A) such as memory keep-alive. In normal switching mode, the standby power loss is about 60m W, limiting efficiency at...
