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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.
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If input voltage (VIN) has noise such as ripples, it is advisable to select an LDO regulator with a high ripple rejection ratio (R.R.).
R.R. is a figure of merit that represents the capability of an LDO regulator to filter out the ripples superimposed on VIN from the output.
Use R.R. as a guide when using an LDO regulator in analog and other highly noise-sensitive circuits. In cases where an LDO regulator is preceded by a DC-DC converter, an LDO regulator with a higher R.R. is more suitable for CMOS sensor and other high-precision analog circuits because a high-R.R. LDO regulator provides an excellent noise suppression capability. The ripple rejection ratio is calculated as follows:
R.R. varies with ripple frequency. R.R. decreases as ripple frequency increases.
The R.R. curve shown in Figure 2 indicates that 200-Hz ripples can be suppressed to roughly 1/30000th whereas 100,000-Hz ripples can be suppressed to only roughly 1/800th.
The ripple rejection ratio is also called the power supply rejection ratio (PSRR) or the supply voltage rejection ratio (SVRR).
For LDO’s ripple rejection ratio, please refer to
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