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General Description

The MIC2171 is a complete 100 kHz SMPS

current-mode controller with an internal 65V 2.5A

power switch.

Although primarily intended for voltage step-up

applications, the floating switch architecture of the

MIC2171 makes it practical for step-down, inverting,

and Cuk configurations, as well as isolated topologies.

Operating from 3V to 40V, the MIC2171 draws only

7 mA of quiescent current, making it attractive for

battery-operated applications.

The MIC2171 is available in a 5-pin TO-220 or TO-263

package that allows ¨C40¡ãC to +85¡ãC ambient

temperature operation.

Features

? 2.5A, 65V Internal Switch Rating

? 3V to 40V Input Voltage Range

? Current Mode Operation, 2.5A Peak

? Internal Cycle-by-Cycle Current Limit

? Twice the Frequency of the LM2577

? Low External Electronic Components Count

? Suitable for Most Switching Topologies

? 7 mA Quiescent Current (Operating)

? Fits LT1171/LM2577 TO-220 and TO-263 Sockets

Applications

? Laptop/Palmtop Computers

? Battery Operated Equipment

? Handheld Instruments

? Off-Line Converter up to 50W (Requires External

Power Switch)

? Predriver for Higher Power Capability