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模擬集成電路的低電壓系統(tǒng)-Analog ICs for Lo

作者: 時間:2012-01-30 來源:網絡 收藏
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MAX3471MAX3471MAX3076EUSBMAX3453MAX3453MAX3453MAX3453

Power Savings from Low-Voltage Operation

The power saved by reducing a system supply voltage from 5V to a lower value can be dramatic. For resistive and capacitive loads, power saved is proportional to the voltage squared. For constant-current loads such as references and op amps, the savings are linear. For constant-power loads such as hard-disk drives, the switch to low voltage does not save power, but requires the device to operate at a lower input voltage. Table 2 summarizes the power savings offered by lower voltage systems as compared to 5V systems.

Table 2. Power Savings Compared to 5V When Using Lower Voltages
        Load TypePower-Savings
        Formula
        Power Savings Compared to 5V (%)
        1.8V
        Operation
        2.5V
        Operation
        3V
        Operation
        3.3V
        Operation
        Resistive(1 - (V / 5)2) x 10087756456
        Capacitive(1 - (V / 5)2) x 10087756456
        Constant Current(V / 5) x 100645040

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