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MIC5238-1.1YD5 Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC5238-1.1YD5 Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 12 page  Micrel, Inc. MIC5238 November 2008 10 M9999-111209 Dual Supply Mode Efficiency By utilizing a bias supply the conversion efficiency can be greatly enhanced. This can be realized as the higher bias supply will only consume a few µA’s while the input supply will require a few mA’s. This equates to higher efficiency saving valuable power in the system. As an example, consider an output voltage of 1V with an input supply of 2.5V at a load current of 150mA. The input ground current under these conditions is 2mA, while the bias current is only 20µA. If we calculate the conversion efficiency using the single supply approach, it is as follows: Input power = VIN × output current + VIN × (VBIAS ground current + VIN ground current) Input power = 2.5V × 150mA + 2.5 × (0.0002+0.002) = 380.5mW Output power = 1V × 0.15 = 150mW Efficiency = 150/380.5 × 100 = 39.4% Now, using a lower input supply of 1.5V, and powering the bias voltage only from the 2.5V input, the efficiency is as follows: Input power = VIN × output current + VIN × VIN ground current + VBIAS x VBIAS ground current Input power = 1.5 × 150mA + 1.5 × 0.002 + 2.5 × 0.0002 = 225mW Output power = 1V × 150mA = 150mW Efficiency = 150/225 × 100 = 66.6 % Therefore, by using the dual supply MIC5238 LDO the efficiency is nearly doubled over the single supply version. This is a valuable asset in portable power management applications equating to longer battery life and less heat being generated in the application. This in turn will allow a smaller footprint design and an extended operating life. |
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