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What is PSRR of an LDO ?
PSRR of an LDO
PSRR (Power Supply Rejection Ratio) is a measure of an LDO regulator’s ability to suppress ripple noise from the input voltage at its output.
A higher PSRR indicates better noise suppression capability.
In our datasheets, this characteristic is expressed as Ripple Rejection Ratio (R.R.), which has the same meaning as PSRR.
Definition of PSRR
PSRR is defined by the following equation.
For example, if the input ripple voltage is 200 mV and the output ripple voltage is 0.2 mV, the PSRR would be 60 dB.
Frequency Characteristics of PSRR
PSRR has frequency characteristics, meaning the suppression level varies depending on the frequency of the ripple noise.
Even when using the same LDO, differences in the switching frequency of the power supply (e.g., switching regulator) can result in different ripple frequencies, which in turn affect the attenuation performance.
It is important to keep in mind the frequency characteristics of PSRR when selecting and using an LDO.
Introduction of High-PSRR LDOs
We have released several high PSRR LDO regulators such as TCR3RM series, TCR5RG series, and TCR5FM series. The main characteristics are as follows.
| Series | TCR3RM series | TCR5RG series | TCR5FM series | ||
|---|---|---|---|---|---|
| Package | Name | DFN4C, DFN4F | WCSP4F | DFN4D | |
| Size typ. (mm) | 1.0×1.0×0.38 | 0.645×0.645×0.33 | 1.0×1.0×0.37 | ||
| Operating ranges | Input voltage VIN (V) | 1.8～5.5 | 1.8～5.5 | 1.55～5.5 | |
| Output current IOUT (mA) | 300 | 500 | 500 | ||
| Operation temperature Topr (°C) | -40～85 | -40～85 | -40～125 | ||
| Electrical characteristics （Unless otherwise specified, Tj=25°C、VIN= 3.3V、VOUT=2.8V） |
Output voltage VOUT (V) | 0.9～4.5 | 0.9～5.0 | 0.9～5.0 | |
| Output voltage accuracy VOUT (%) |
IOUT=1～500mA Tj=-40～125°C |
±2 | ±1.5 | ±2.2 | |
| Quiescent current IB(ON) typ. (μA) |
IOUT=0mA | 7 | 7 | 10 | |
| Stand-by current IB(OFF) typ. (μA) |
VCT=0V | 0.1 | 0.08 | 0.1 | |
| Drop-out voltage VDO typ. (mV) |
IOUT=300mA or 500mA | 130 | 150 | 220 | |
| Ripple rejection ratio R.R. typ. (dB) |
IOUT=10mA, VRipple=200mVp-p, f=1kHz | 100 | 100 | 91 | |
| IOUT=10mA, VRipple=200 mVp-p, f=10kHz | 93 | 93 | 89 | ||
| IOUT=10mA, VRipple=200 mVp-p, f=100kHz | 68 | 67 | 67 | ||
| IOUT=10mA, VRipple=200 mVp-p, f=1MHz | 68 | 59 | 59 | ||
| Sample Check & Availability |  |
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Related Links
The following documents also contain related information.
