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