General Description

The Micrel MIC22400 is a high-efficiency, 4A integrated switch synchronous buck (step-down) regulator. The MIC22400 is optimized for highest efficiency, achieving over 90 efficiency while still switching at 1MHz over a broad load range. The ultra-high-speed control loop keeps the output voltage within regulation even under extreme transient load swings commonly found in FPGAs and lowvoltage ASICs.

Features

• Input voltage range: 2.6V to 5.5V

• Output voltage adjustable down to 0.7V

• Output load current up to 4A

• Full sequencing and tracking ability

• Power-On-Reset (POR)

• Efficiency > 90 across a broad load range

• Programmable frequency 300kHz to 4MHz

• Easy Ramp Control™ (RC) compensation

• Ultra-fast transient response

• 100 maximum duty cycle

• Fully-integrated MOSFET switches

• Micropower shutdown

• Thermal-shutdown and current-limit protection

• 20-pin 3mm x 4mm MLF®

• 20-pin ePad TSSOP

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

Applications

• High power density point-of-load conversion

• Servers and routers

• DVD recorders

• Computing peripherals

• Base stations

• FPGAs, DSP and low-voltage ASIC power