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MIC4782 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC4782 Datasheet(HTML) 1 Page - Micrel Semiconductor |
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1 / 23 page  MIC4782 1.8 MHz Dual 2A Integrated Switch Buck Regulator General Description The Micrel MIC4782 is a high efficiency dual PWM buck (step-down) regulator that provides dual 2A output current. The MIC4782 operates at 1.8MHz. A proprietary internal compensation technique allows a closed loop bandwidth of over 200kHz. The low on-resistance internal P-Channel MOSFET of the MIC4782 allows efficiencies over 92%, reduces external components count and eliminates the need for an expensive current sense resistor. The MIC4782 operates from 3.0V to 6.0V 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 MIC4782 is available in the exposed pad 16-pin 3mm x 3mm MLF ® with a junction operating range from –20°C to +125°C. All support documentation can be found on Micrel’s web site at: www.micrel.com. Features • 3.0 to 6.0V supply voltage • 1.8MHz 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 × 3mm 16-pin MLF ® • –20 °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 80 82 84 86 88 90 92 94 96 98 100 0 0.4 0.8 1.2 1.6 2 OUTPUT CURRENT (A) 2A, 1.8MHz Dual Buck Regulator MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com August 2009 1 M9999-081709-D |
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