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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
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
  • Category1.8V2.5V3V3.3V
    μP SupervisorsMAX6326MAX6742MAX6745MAX6745
    A/D ConvertersMAX1122MAX1462MAX1115MAX1144
    Analog SwitchesMAX4695MAX4644MAX4653MAX4592
    Charge-Pump Voltage Converters
    —
    		MAX619MAX1673MAX1730
    Inductor-Based, Step-Up RegulatorsMAX1687MAX1706MAX1678MAX1709
    Inductor-Based, Step-Down RegulatorsMAX1928MAX1928MAX1921MAX1921
    Comparators, FastLMX331MAX997MAX997MAX997
    Comparators, Low CurrentMAX9020MAX9020MAX9020MAX9020
    Comparators, Low OffsetMAX966MAX997MAX997MAX997
    D/A ConvertersMAX5522MAX5523MAX5811MAX5355
    Digital Pots
    —
    		DS4301MAX5408MAX5408
    Linear Regulators

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