低功耗、宽输入范围的单片式LDO设计

发布时间：2018-03-28 06:44

  本文选题：LDO　切入点：低功耗　出处：《电子科技大学》2014年硕士论文

【摘要】：电子技术的飞速发展使得便携式电子设备广泛普及,相应的电源管理技术也得到了前所未有的发展。作为电源管理产品中非常重要的一员,低压差线性稳压器(Low Dropout Regulator,LDO)因为其工作电压低、输出噪声低、输出纹波小、体积小以及应用电路简单等特点而得到了广泛应用。尤其是在一些低功耗、低噪声、高精度和低成本的应用中,LDO具有非常广阔的前景。本文设计了一款具有低功耗以及宽输入电压范围等特点的LDO芯片。该芯片空载时静态电流仅为2.12μA,全负载范围内输入电压范围是3.4V~24V,输出电压固定为2.5V,最大输出电流可达到80mA,并且无需外接电容即可保持系统环路稳定。此外,芯片内部集成了过流保护功能,采用恒定电流限和折返电流限相结合的方式对芯片进行过流保护。在芯片内部电路中,带隙运放(将带隙基准和误差放大器集成到一起)电路和折返电流限电路是主要特点。该芯片可为超低功耗微控制器和手持式电子设备等用电系统提供良好的电源解决方案。由于所设计的LDO芯片没有独立的基准电压源电路,而在绝大多数LDO芯片中基准电压源都是单独出现的一个重要模块,因此有必要进行基准电压源的设计。同时也为了适应无电阻的设计趋势,本文设计了一种适用于无电阻LDO以及SoC(System on Chip)中的连续输出全集成开关电容电压基准电路。这是一个输出电压为323mV的低压输出亚带隙基准,其在-20℃~80℃温度范围内的温度系数为15.4ppm/℃。本文首先介绍LDO的相关背景知识,再简述LDO的基本原理,接下来介绍所设计的LDO的主要性能指标、系统架构和一些主要模块的设计考虑,紧接着给出具体电路和仿真结果,最后介绍一种无电阻的连续输出全集成开关电容电压基准电路。本文采用0.35μm BCD(Bipolar、CMOS和DMOS)工艺,使用Hspice软件对电路进行了仿真验证。各项仿真结果表明,本文所设计的LDO芯片达到了预期的设计指标,开关电容电压基准电路也具有良好的性能。
[Abstract]:With the rapid development of electronic technology, portable electronic equipment has been widely spread, and the corresponding power management technology has been unprecedented development. As a very important member of power management products, Low Dropout regulator (LDO) has been widely used because of its low voltage, low output noise, small output ripple, small volume and simple application circuit, especially in some low power consumption, low noise, etc. In high precision and low cost applications, LDO has a very broad prospect. In this paper, a LDO chip with low power consumption and wide input voltage range is designed. The static current of the chip is only 2.12 渭 A when it is no load, and it is in the full load range. The input voltage ranges from 3.4 V to 24 V, the output voltage is fixed at 2.5 V, the maximum output current is up to 80 Ma, and the system loop is stable without external capacitance. The over-current protection function is integrated inside the chip, and the over-current protection is carried out by the combination of constant current limit and reentrant current limit. The circuit of bandgap operational amplifier (which integrates bandgap reference and error amplifier) and reentrant current limiting circuit are the main features. The chip can provide good electricity for ultra-low power consumption microcontroller and hand-held electronic equipment, etc. Source solution. Because the LDO chip has no independent reference voltage source circuit, In most LDO chips, the reference voltage source is a single important module, so it is necessary to design the reference voltage source. In this paper, a continuous output fully integrated switched capacitor voltage reference circuit suitable for resistive LDO and SoC(System on Chip is designed, which is a low-voltage output sub-band gap reference with 323mV output voltage. Its temperature coefficient is 15.4ppm/ 鈩，

本文编号：1675188