4 MHz Dual 2A Integrated Switch Buck Regulator

General Description
The Micrel MIC4744 is a high efficiency dual PWM buck (step-down) regulator that provides dual 2A current output. The MIC4744 operates at 4MHz. A proprietary internal compensation technique allows a closed loop bandwidth of over 200kHz.
The low on-resistance internal P-Channel MOSFET of the MIC4744 allows efficiencies over 90%, reduces external components count and eliminates the need for an expensive current sense resistor.
The MIC4744 operates from 2.9V to 5.5V input and the output can be ad;usted down to 0.6V. The device can operate with a maximum duty cycle of 100% for use in low-dropout conditions.
The MIC4744 is available in the exposed pad 16-pin 3mm x 3mm MLF® and ETSSOP-16 packages with junction operating temperature ranging from -40°C to +125CC.
All support documentation can be found on Micrel's web site at: www.micrel.com.

Features
• 2.9 to 5.5V supply voltage
• 4MHzPWMmode
• 2A Dual output
• Greater than 90% efficiency
• 100% maximum duty cycle
• Output voltage adjustable down to 0.6V
• Ultra-fast transient response
• Ultra-small external components
Stable with a 0.47uH inductor and a 10uF output capacitor
• Fully integrated 2A MOSFET switches
• Micro-power shutdown
• Thermal shutdown and current limit protection
• Available in 3mm x 3mm 16-pin MLF® and 16-pin TSSOP packages
• -40QC to +125°C junction temperature range
Applications
• Broadband: xDSL modems
• Automotive satellite radios
• HD STB, DVD/TV recorder
• Computer peripherals: printers and graphic cards
• FPGA/ASIC
• General point of load