General Description

The MIC2171 is a complete 100kHz 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 7mA of quiescent current, making it attractive for battery operated supplies.

The MIC2171 is available in a 5-pin TO-220 or TO-263 for –40°C to +85°C 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

• Thermal shutdown

• Twice the frequency of the LM2577

• Low external parts count

• Operates in most switching topologies

• 7mA quiescent current (operating)

• Fits LT1171/LM2577 TO-220 and TO-263 sockets

Applications

• Laptop/palmtop computers

• Battery operated equipment

• Hand-held instruments

• Off-line converter up to 50W(requires external power switch)

• Pre-driver for higher power capability