Question 1

What is a PSRR? (Linear Regulators (LDO Regulators))

Accepted Answer

PSRR is an acronym for Power Supply Rejection Ratio.it refers to the ability to block the transmission of ripple voltage from the input source to the output side in linear regulators (LDO regulators),

Question 2

What is a Over Current Protection? (Linear Regulators (LDO Regulators))

Accepted Answer

Over Current protection is a protection circuit that turns off the output when a large current flows through the regulator, such as when there is a short between the output terminal and the ground terminal, to prevent destruction.

Question 3

What is a thermal shutdown circuit? (Linear Regulators (LDO Regulators))

Accepted Answer

The Thermal Shutdown Circuit detects overheating of the regulator if the output pin (VOUT) is shorted to the ground pin (GND) and stops the regulator operation to protect it from damage.

Question 4

What is  a Reverse current protection function? (Linear Regulators (LDO Regulators))

Accepted Answer

The reverse current protection function prevents current from flowing from the output to the input side when the potential of the output side becomes higher than that of the input side.

Question 5

What is a Soft Start? (Linear Regulators (LDO Regulators))

Accepted Answer

Soft-start is function for slowly starting the output power. ABLIC's products are available with output voltage rise time adjustable with an external capacitor or with time fixed internally in the IC.

Question 6

What is a Output voltage external setting? (Linear Regulators (LDO Regulators))

Accepted Answer

Output voltage external setting is a function that sets the output voltage by using an external feedback resistor.

Question 7

What is a  Inrush current limit circuit? (Linear Regulators (LDO Regulators))

Accepted Answer

Inrush current is a large current that temporarily flows when a linear regulator (LDO regulator) starts up, which may cause unstable operation of the equipment.The inrush current limit circuit limits the inrush current for a certain period of time.

Question 8

What is a Output noise? (Linear Regulators (LDO Regulators))

Accepted Answer

Output noise is the noise generated by the linear regulator (LDO regulator) IC itself.

Question 9

What is the supply voltage divided output? (Linear Regulators (LDO Regulators))

Accepted Answer

The supply voltage divided output is a function that divides the input voltage (Vin) of the regulator into Vin/2 or Vin/3 and outputs the voltage. For example, this function makes it possible that the IC connects to a low voltage microcontroller A/D converter directly and the microcontroller monitors a battery voltage.

Question 10

What is a discharge shunt circuit ? (Linear Regulators (LDO Regulators))

Accepted Answer

The discharge shunt function compresses the output voltage fall time during power-off. The discharge shunt circuit quickly discharges the charge of the output capacitor to bring the output pin to VSS level in a short time.

Question 11

In the S-19212 Series, how should the ON/OFF pin be handled if not in use? (Linear Regulators (LDO Regulators))

Accepted Answer

The ON/OFF should be connected directly to the VIN pin. Connecting the ON/OFF pin via a resistor is also an option.

Question 12

Does the S-19212 Series require an external current limiting resistor for the ON/OFF pin? (Linear Regulators (LDO Regulators))

Accepted Answer

The S-19212 Series does not require an external current limiting resistor.

Question 13

Is there a recommended value for the input capacitor (CIN) for the S-19212 Series? (Linear Regulators (LDO Regulators))

Accepted Answer

We recommend an input capacitance (CIN) of 1.0μF or more.

Question 14

For the S-19212 Series, in what frequency range should the ESR of the output capacitor (CL) be considered? (Linear Regulators (LDO Regulators))

Accepted Answer

The frequency range that affects the stability of the IC is 1kHz to 1MHz. Please ensure that the ESR is 100Ω or less within this range.

Question 15

Is there a recommended output capacitance (CL) for the S-19212 Series when using a ceramic capacitor? Also, what's the reason for this selection? (Linear Regulators (LDO Regulators))

Accepted Answer

The S-19212 Series recommends an output capacitance of 1μF or more. We've confirmed that the device operates stably without oscillation, even with a capacitor having an ESR of about 100Ω. This is due to a design that prevents oscillation by maintaining a stable phase. Specifically, we recommend ceramic capacitors like the TDK CGA5L3X8R1H105M (1μF), as listed in the datasheet.

FAQ Frequently Asked Questions

Product Category

What is a PSRR?

What is a Over Current Protection?

What is a thermal shutdown circuit?

What is a Reverse current protection function?

What is a Soft Start?

What is a Output voltage external setting?

What is a Inrush current limit circuit?

What is a Output noise?

What is the supply voltage divided output?

What is a discharge shunt circuit ?

In the S-19212 Series, how should the ON/OFF pin be handled if not in use?

Does the S-19212 Series require an external current limiting resistor for the ON/OFF pin?

Is there a recommended value for the input capacitor (CIN) for the S-19212 Series?

For the S-19212 Series, in what frequency range should the ESR of the output capacitor (CL) be considered?

Is there a recommended output capacitance (CL) for the S-19212 Series when using a ceramic capacitor? Also, what's the reason for this selection?