General Description
The Micrel MIC2166 is a synchronous adaptive on-time buck controller targeting high-performance, cost-sensitive applications such as set-top boxes, gateways, routers, computing peripherals, and telecom/networking equipment.

Features
• Hyper Speed Control™ architecture enables
    - High delta V operation (VIN=28V and VOUT=0.8V)
    - Small output capacitance
• Built-in 5V regulator for single-supply operation
• Any CapacitorTM stable
    - Zero ESR to high ESR
• Power-Good (PGOOD) output
• Input voltage range: 4.5V to 28V
• 5μA typical shutdown current
• 25A output current drive capability
• Adjustable output from 0.8V to 5.5V with ±1% FB accuracy
• 600kHz switching frequency
• Internal 5ms digital soft-start
• Thermal-shutdown and hiccup current-limit protection
• No external current-sense resistor required
• Safe start-up into pre-biased loads
• 10-pin MSOP ePad package
• –40°C to +125°C junction temperature range

Applications
• Set-top box, gateways, routers and DSL modems
• Printers, scanners, graphic and video cards
• Servers, PCs and processor core supply
• Low-Voltage Distributed Power