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MIC2141 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2141 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 16 page MIC2141 Micropower Boost Converter Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com December 2006 1 M9999-122006 General Description The MIC2141 is a micropower boost switching regulator that can operate from 3- or 4-cell nickel-metal-hydride batteries or a single Li-ion cell. This regulator employs a constant 330kHz, fixed 18% duty-cycle, gated-oscillator architecture. The MIC2141 can be used in applications where the output voltage must be dynamically adjusted. The device features a control signal input which is used to proportionally adjust the output voltage. The control signal input has a gain of 6, allowing a 0.8V to 3.6V control signal to vary a 4.8V to 22V output. The MIC2141 requires only three external components to operate and is available in a tiny 5-pin SOT-23 package for space and power-sensitive portable applications. The MIC2141 draws only 70µA of quiescent current and can operate with an efficiency exceeding 85%. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features • Implements low-power boost, SEPIC, or flyback • 2.2V to 14V input voltage • 330kHz switching frequency • <2µA shutdown current • 70µA quiescent current • 1.24V bandgap reference • Typical output current 1mA to 10mA • SOT23-5 package Applications • LCD bias supply • CCD digital camera supply ___________________________________________________________________________________________________________ Typical Application MIC2141 Variable V OUT V C* (from DAC) 10µF 10µH 15 2 34 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 5 10 15 20 25 V OUT (V) Control Voltage vs. Output Voltage DAC-Controlled LCD Bias Voltage Supply |
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