MIC4742 Datasheet, PDF (1/23 Pages) Micrel Semiconductor – 2 MHz Dual 2A Integrated Switch Buck Regulator

MIC4742
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 adjusted 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 –40°C to +125°C.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
• 2.9 to 5.5V supply voltage
• 2MHz PWM mode
• 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 1µH inductor and a 4.7µF 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
Typical Application
5.0Vin 3.3Vout Efficiency
100
98
96
94
92
90
88
86
84
82
80
0
0.4
0.8
1.2
1.6
2
OUTPUT CURRENT (A)
2A 2MHz Dual Buck Regulator
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 2009
1
M9999-030209-D