General Description

The Micrel MIC2174/MIC2174C is a fixed-frequency, synchronous buck controller featuring adaptive on-time control. The MIC2174/MIC2174C operates over an input supply range of 3V to 40V at a fixed switching frequency of 300kHz and is capable of driving 25A of output current. The output voltage is adjustable down to 0.8V.

Features

• Hyper Speed Control™ architecture enables:

– High delta V operation (VHSD = 40V and VOUT = 0.8V)

– Smaller output capacitors than competitors

• 3V to 40V input voltage

• Any CapacitorTM stable

- Zero ESR to high ESR

• 300kHz switching frequency

• Adjustable output from 0.8V to 5.5V (VHSD ≤ 28V)

• Adjustable output from 0.8V to 3.6V (VHSD > 28V)

• ±1 FB accuracy (MIC2174)

• ±3 FB accuracy (MIC2174C)

• Up to 94 efficiency

• Foldback current limit and “hiccup” mode short-circuit protection

• Thermal shutdown

• Safe start-up into pre-biased loads

• –40°C to +125°C junction temperature range

Applications

• Telecom Networking

• Industrial Equipment

• Distributed DC power systems