模擬集成電路的低電壓系統(tǒng)-Analog ICs for Lo
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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 Type | Power-Savings Formula | Power Savings Compared to 5V (%) | |||
| 1.8V Operation | 2.5V Operation | 3V Operation | 3.3V Operation | ||
| Resistive | (1 - (V / 5)2) x 100 | 87 | 75 | 64 | 56 |
| Capacitive | (1 - (V / 5)2) x 100 | 87 | 75 | 64 | 56 |
| Constant Current | (V / 5) x 100 | 64 | 50 | 40 |
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