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如果要降低电源电压，选择DC-DC转换器还是LDO稳压器？
降压型DC-DC转换器和LDO稳压器均具有降压功能。
下面对DC-DC转换器和LDO稳压器进行比较。
| LDO | DC-DC转换器 | |
|---|---|---|
| 外围器件数量 |
✔✔✔ | ✔ |
| 待机功耗 |
✔✔✔ | ✔ |
| 噪音特性 |
✔✔✔ | ✔ |
| 功率效率 |
✔ | ✔✔✔✔ |
✔：一般 ✔✔：良好 ✔✔✔：很好 ✔✔✔✔：优异
通常在以下情况下选用DC-DC转换器：
- 强调功率转换效率
- 不需担心噪声
在下列情况下，常选用LDO：
- 我想减少降低供电电压所需的元器件数量
- 降低待机功耗
- 噪声特性很重要
LDO的主要优点如下所述。
LDO的优点1：电路简单，元器件较少
LDO的电路较小，可由外部元器件供电。因此，其价格更便宜并且耗电量更少。另外，由于控制方式也很简单，因此无需微调即可输出电压。
LDO的优点2：低噪声功率输出
由于LDO通过可变电阻的移动来控制电压，因此可以输出噪声相对较低的电压。
DC-DC通过开关操作输出电压，并通过LC滤波器使其平滑，因此可以在稳定状态下使用。
电压波动。（电压波纹）
相关链接
以下文档也包含相关信息：
产品列表
应用说明
- Basics of Low-Dropout (LDO) Regulator ICs (PDF:1.45MB)
- LDO Regulator Application to Power Supply Circuits for MCUs (PDF:2.62MB)
- Thermal Design to Maximize the Performance of LDO Regulators (PDF:768KB)
- Simple Guide to Improving Ripple Rejection Ratio of LDO Regulators (PDF:1.30MB)
- Mechanism of LDO Oscillation and Reducing the Susceptibility to Oscillation (PDF:1.43MB)
- LDO Regulators Glossary (PDF:388KB)
- Power Efficiency Optimization and Application Circuits Using Dual-power-supply LDO Regulators (PDF:824KB)
- Improving the Load Transient Response of LDOs (PDF1.24MB)
- LDO Regulator Application to Power Supply Circuits for Digital Cores of CMOS Image Sensors (PDF:2.50MB)
- LDO Regulator Application to Power Supplies for High-Frequency Circuits (PDF:3.55MB)
