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MIC2145 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2145 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 15 page May 2003 1 MIC2145 MIC2145 Micrel MIC2145 High Efficiency 2.5W Boost Converter Final General Description The MIC2145 is a small size boost switching regulator that can provide over 2.5W of output power. The input voltage range is between 2.4V to 16V, making the device suitable for one-cell Li-Ion and 3- to 4-cell alkaline/NiCad/NiMH applica- tions. The output voltage of the MIC2145 can be adjusted up to 16V. The MIC2145 is well suited for portable, space-sensitive applications. Its typical 450kHz operation allows small sur- face mount external components to be used. The MIC2145 has a low quiescent current of 200 µA, and a typical shutdown current of 0.5 µA. The MIC2145 is capable of high efficiencies in a small board area. The MIC2145 features a low-on resistance internal switch that allows it to provide over 2.5W of output power. The peak switch current can be programmed through an external resistor. This allows the user to set the peak switch current at the level where maximum efficiency occurs. It also allows the user to further optimize for efficiency and inductor size by setting the peak current below the level of inductor saturation. The MIC2145 is available in an MSOP-8 and 3mm ×3mm MLF™-10L package with an ambient operating temperature range from –40 °C to +85°C. Typical Application L1 10 H D1 MIC2145BMM RSET PGND EN SW VOUT 10V/150mA VDD FB SGND I Limit VIN 3.0V to 5.0V SS CIN 10 F/6.3V COUT 10 F/16V 15 6 7 8 4 3 2 60 65 70 75 80 85 90 10 100 1000 OUTPUT CURRENT (mA) 10V Output Efficiency V IN = 3.0V Adjustable Output Boost Converter with Programmable Peak Switch Current Features • 2.4V to 16V input voltage • Output adjustable to 16V • Programmable peak current limit • Soft start • Up to 450kHz switching frequency • 0.5 µA shutdown current • 200 µA quiescent current • Capable of 5V/ 500mA output with 3.3V input • Achieves over 85% efficiency • Implements low power BOOST, SEPIC, and FLYBACK topologies • MSOP-8 and 3mm ×3mm MLF™-10L Applications • Flash LED driver • LCD bias supply • White LED driver • DSL bias supply • Local 3V to 5V conversion Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com Ordering Information Part Number Voltage Ambient Temp. Range Package MIC2145BMM Adj –40 °C to +85°C 8-lead MSOP MIC2145BML Adj –40 °C to +85°C3×3 MLF™-10L |
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