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MIC2285 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2285 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 14 page MIC2285 8MHz PWM Synchronous Buck Regulator with LDO Standby Mode Patent Pending LOWQ is a trademark of Micrel, Inc MLF and MicroLeadFrame are 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 January 2006 M9999-012406 www.micrel.com General Description The Micrel MIC2285 is a high efficiency 8MHz pulse width modulated (PWM) synchronous buck (step- down) regulator that features a LOWQ™ LDO standby mode that draws only 18µA of quiescent current. The MIC2285 allows an ultra-low noise, small size, and high efficiency solution for portable power applications. In PWM mode, the MIC2285 operates with a constant frequency 8MHz PWM control. Under light load conditions, such as in system sleep or standby modes, the PWM switching operation can be disabled to reduce switching losses. In this light load LOWQ™ mode, the LDO maintains the output voltage and draws only 18µA of quiescent current. The LDO mode of operation saves battery life while not introducing spurious noise and high ripple as experienced with pulse skipping or bursting mode regulators. The MIC2285 operates from a 2.7V to 5.5V input voltage and features internal power MOSFETs that can supply up to 500mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. The MIC2285 is available in the 10-pin 3mm x 3mm MLF™ package with a junction operating range from –40 °C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features • 2.7 to 5.5V supply/input voltage • Light load LOWQ™ LDO mode 20µA quiescent current Low noise, 75µVrms • 8MHz PWM mode Output current to 500mA >90% efficiency 100% maximum duty cycle • Adjustable output voltage option down to 1V Fixed output voltage options available • Ultra-fast transient response • Uses a tiny 0.47µH inductor • Enables sub 1mm profile solution • Fully integrated MOSFET switches • Micropower shutdown • Thermal shutdown and current limit protection • Pb-free 10-pin 3mm x 3mm MLF package • –40°C to +125°C junction temperature range Applications • Cellular phones • PDAs • USB peripherals ____________________________________________________________________________________________________ Typical Application Adjustable Output Buck Regulator with LOWQ™ Mode 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) 1.8VOUT Efficiency 0 100 200 300 400 500 VIN=3.2V VIN=3.6V VIN=4.2V |
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