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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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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)
