LT1432 Datasheet PDF | Linear Technology

Linear Technology LT1432

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. 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 100mA) such as memory keep-alive.

Part No.	LT1432
Datasheet	LT1432 Download
Manufacturer	Linear Technology
Description	5V High Efficiency Step-Down Switching Regulator Controller
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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 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 15µA battery current. In normal switching mode, the standby power loss is about 60mW, limiting efficiency at light loads. In burst mode, standby loss is reduced to approximately 15mW. Output current in this mode is typically in the 5mA to 100mA range. The LT1432 is available in 8-pin surface mount and DIP packages. The LT1170/LT1270 family will also be available in a surface mount version of the 5-pin TO-220 package. For 3.3V versions contact Linear Technology Corporation.