2 MHz Dual 2A Integrated Switch Buck Regulator

General Description
The Micrel MIC4742 is a high efficiency dual PWM buck (step-down) regulator that provides dual 2A current output. The MIC4742 operates at 2MHz. A proprietary internal compensation technique allows a closed loop bandwidth of over 200kHz.
The low on-resistance internal P-Channel MOSFET of the MIC4742 allows efficiencies over 92%, reduces external components count and eliminates the need for an expensive current sense resistor.
The MIC4742 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 MIC4742 is available in the exposed pad 16-pin 3mm x 3mm MLF® and EPAD TSSOP-16 packages with a junction operating range from -40CC 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
2MHzPWMmode
2A Dual output
Greater than 92% efficiency
100% maximum duty cycle
Adjustable output voltage option down to 0.6V
Ultra-fast transient response
Ultra-small external components
Stable with a 1uH inductor and a 4.7uF output
capacitor
Fully integrated 2A MOSFET switches
Micro-power shutdown
Thermal shutdown and current limit protection
Available in a 3mm x 3mm 16-pin MLF® and 16-pin
TSSOP
-40°C 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