模拟集成电路的低电压系统-Analog ICs for Lo
Introduction
Low voltages are most appropriate for use in systems where size, weight, and power consumption are especially critical such as PDAs, cell phones, and other battery-operated portable equipment. Low voltages also benefit line-powered systems because the lower power dissipation associated with lower voltage operation allows the use of smaller power supplies, heat-sinks, and fans.Low-voltage ICs are available in many of Maxim's product families including op amps, comparators, microprocessor supervisors, interface, data converters, analog switches and multiplexers, voltage references, DC-DC converters, digital potentiometers, and timing components such as real-time clocks.
This discussion covers many of the analog IC families mentioned above, the power savings inherent in their operation, and how to handle some of the issues associated with low-voltage operation. It also presents methods for generating the lower voltages from a 5V supply. Table 1 presents a selection of Maxim's 1.8V, 2.5V, 3.0V, and 3.3V integrated circuits.
Table 1. A Selection of Maxim's Low-Voltage Parts
| Category | 1.8V | 2.5V | 3V | 3.3V |
| µP Supervisors | MAX6326 | MAX6742 | MAX6745 | MAX6745 |
| A/D Converters | MAX1122 | MAX1462 | MAX1115 | MAX1144 |
| Analog Switches | MAX4695 | MAX4644 | MAX4653 | MAX4592 |
| Charge-Pump Voltage Converters |
|
MAX619 | MAX1673 | MAX1730 |
| Inductor-Based, Step-Up Regulators | MAX1687 | MAX1706 | MAX1678 | MAX1709 |
| Inductor-Based, Step-Down Regulators | MAX1928 | MAX1928 | MAX1921 | MAX1921 |
| Comparators, Fast | LMX331 | MAX997 | MAX997 | MAX997 |
| Comparators, Low Current | MAX9020 | MAX9020 | MAX9020 | MAX9020 |
| Comparators, Low Offset | MAX966 | MAX997 | MAX997 | MAX997 |
| D/A Converters | MAX5522 | MAX5523 | MAX5811 | MAX5355 |
| Digital Pots |
|
DS4301 | MAX5408 | MAX5408 |
| Linear Regulators |
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