How does LDO regulator work?
The working principle of LDO regulator is just like that of an ordinary linear voltage regulator. The essential components of an LDO voltage regulator are a reference voltage source, error amplifier and series pass element (BJT or MOSFET). This increase in output voltage will increase the error voltage (VERR).
Where can I use LDO regulator?
An LDO regulator is a linear regulator that can operate at a very low potential difference between the input and output voltage. A linear regulator is a type of power supply IC that can output a steady voltage from an input voltage and is used in a variety of electronic devices.
Why are LDO’s called low dropout voltage regulators?
But, unlike normal Linear regulators, in an LDO the difference between the input voltage and the output voltage is less. This difference is called as dropout voltage. Since the LDO has very low dropout voltage it is called as Low dropout voltage regulators.
What is the definition of line regulation in LDO?
Line regulation is a measure of the LDO’s ability to maintain the specified output voltage with varying input voltage. Line regulation is defined as Figure 7 shows the output voltage of the ADM7172 vs. input voltage at different load currents.
How is the output voltage of a LDO measured?
When the load increase or decrease it’s current consumption the output voltage from the regulator should not fluctuate. The fluctuation of the output voltage is measured in mV range per ampere of current and called as accuracies. The output voltage accuracy of an LDO ranges from 5mV to 50mV range, a few percentages of the output voltage.
What happens when the LDO control loop is slow?
If the load transient is very slow, say 100 mA/μs, the control loop of the LDO may be able to follow the change. If, however, the load transient is faster than the loop can compensate, undesirable behavior such as excessive ringing due to low phase margin may occur.