SEPIC Regulators, Linear Technology

A range of SEPIC DC-DC Converters from Linear Technology which can be used in applications where the output voltage may be either higher or lower than the input voltage. The SEPIC (Single-Ended Primary-Inductor Converter) topology also allows these converters to produce a negative output from a positive input voltage. Some of these switching regulators include features such as multiple outputs, programmable current limit, low battery detection and burst-mode operation.

Wide Input Voltage Range: 3V to 60V

Low Quiescent Current: 6mA

Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172)

Shutdown Mode Draws Only 50μA Supply Current

Very Few External Parts Required

Self-Protected Against Overloads

Operates in Nearly All Switching Topologies

Flyback-Regulated Mode Has Fully Floating Outputs

Comes in Standard 5-Pin Packages

LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages

Can Be Externally Synchronized

User Note:

This data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in developing new designs. This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in the higher frequency. A CAD design program called SwitcherCAD® is also available.