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LDO Linear RegulatorsHow to use
Line regulation refers to what extent the output voltage varies as the input voltage changes.
The following figure describes a specification example of line regulation.
Symbol | Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
---|---|---|---|---|---|---|
ΔVOUT / ΔVIN | Line Regulation | Set VOUT + 0.5 V ≤ VIN ≤ 5.25 V, VIN ≥ 1.4 V | 0.02 | 0.10 | %/V |
Symbol | ΔVOUT / ΔVIN |
---|---|
Parameter | Line Regulation |
Test Conditions | Set VOUT + 0.5 V ≤ VIN ≤ 5.25 V, VIN ≥ 1.4 V |
Min. | |
Typ. | 0.02 |
Max. | 0.10 |
Unit | %/V |
This figure suggests that when the input voltage within the range mentioned in the condition changes by 1 V, the output voltage varies by typically 0.02 % / maximum 0.10%.
With an example of a 1.8 V output LDO regulator whose input voltage varies from 3 V to 4.2 V, the extent of variations of the LDO output voltage by line regulation can be estimated as below:
Typ. | 0.02%/V × 1.2 V = 0.024% | 1.8 V × 0.024% = 0.432 mV |
---|---|---|
Max. | 0.10%/V × 1.2 V = 0.12% | 1.8 V × 0.12% = 2.16 mV |
In short, by the input voltage difference between 3 V and 4.2 V, the 1.8 V output changes by typically 0.432 mV / maximum 2.16 mV. The output voltage may be affected both positively and negatively.
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