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 –40°C to +85°C 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