模擬集成電路的低電壓系統-Analog ICs for Lo

作者：時(shí)間：2012-01-30 來(lái)源：網(wǎng)絡(luò )

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Abstract: This article about low-voltage ICs discusses many types of low-voltage ICs, including voltage regulators, data converters, op amps and current monitors, comparators, microprocessor supervisors, voltage references, analog switches, and interface transceivers. It also present information on power savings and how to manage issues related to low-voltage operation.

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
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模擬集成電路的低電壓系統-Analog ICs for Lo

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