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MIC2185 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2185 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 15 page October 2005 1 MIC2185 MIC2185 Micrel, Inc. MIC2185 Low Voltage Synchronous Boost PWM Control IC General Description Micrel’s MIC2185 is a high efficiency synchronous boost PWM control IC. With its wide input voltage range of 2.9V to 14V, the MIC2185 can be used to efficiently boost voltages in 1- or 2-cell Li Ion battery powered applications, as well as fixed 3.3V and 5V systems. Its powerful 5Ω output drivers allow the MIC2185 to supply large output currents with the selection of the proper external MOSFETs. With it’s fixed frequency PWM architecture, and easily synchronized drive, the MIC2185 is ideal for noise-sensi- tive telecommunications applications. The nominal 400kHz operating frequency of the MIC2185 can be divided by two, allowing the device to be externally synchronized to frequen- cies below 400kHz. The MIC2185 also features a low current shutdown mode and a programmable undervoltage lockout. A skipped pulse mode of operation can be manually set to achieve higher efficiencies at light load conditions. The MIC2185 is available in a 16 pin SOIC package and 16 pin QSOP package with an ambient temperature operating range from –40°C to 85°C. Typical Application VINA EN/UVLO FREQ/2 VDD COMP VREF SYNC SKIP SS MIC2185 SGND OUTP VINP FB CIN COUT VOUT = 5V OUTN CSH VIN = 3.3V PGND 5 12 9 13 6 16 14 3 2 11 8 4 10 15 7 1 Si9803DY (x2) Si4884DY (x2) 2.4µH 8m 70 75 80 85 90 95 100 0 1 2 3 4 5 OUTPUT CURRENT (A) 5V Output Efficiency VIN = 3.3V 200kHz P WM Adjustable Output Synchronous Boost Converter Features • Input voltage range: 2.9V to 14V • 95% efficiency • Oscillator frequency of 200kHz/400kHz • Frequency sync to 600kHz • 0.5µA shutdown current • Two 5Ω output drivers • Front edge blanking • PWM current mode control • Cycle-by-cycle current limiting • Frequency foldback protection • Adjustable under-voltage lockout • Precision 1.245V reference output • 16 pin SOIC narrow body package Applications • 3.3V to 5V conversion in telecom systems • Satellite phones • Cable modems • 1-and 2-cell Li Ion battery operated equipment Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com Ordering Information Part Number Frequency Voltage Junction Temp. Range Package Standard Pb-Free MIC2185BM MIC2185YM 200/400kHz Adj –40ºC to +125ºC 16-pin SOIC MIC2185BQS MIC2185YQS 200/400kHz Adj –40ºC to +125ºC 16-pin QSOP |
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