The minimum input-to-output voltage difference a linear regulator needs to hold its output voltage. It increases with output current and, usually, with temperature; for LDOs it is typically tens to hundreds of mV.
Japanese name: ドロップアウト電圧
Dropout voltage appears in 2 practice questions across 2 topics, including Analog and electronic circuits, How to read datasheets.
Field: How to read datasheets
Answer: C. The minimum voltage difference between input and output needed to keep the output at its specified voltage
Dropout voltage is the minimum input-output difference at which a regulator can still hold its output. LDOs use a PMOS (or similar) pass transistor to bring it down to about 0.1–0.3 V—for example, producing 2.8 V from a lithium-ion cell (3.0–4.2 V). Loss is (Vin − Vout) × current, so a small difference means better efficiency. With high ripple rejection, LDOs are widely used to power noise-sensitive circuits.
Answer: A. 3.6 V
Dropout voltage is the minimum voltage difference required between input and output to maintain the output voltage. Adding the max of 300 mV to the 3.3 V output, the input must be 3.6 V or higher. Dropout voltage increases with output current and, in many cases, at higher temperature, so use the value specified under the current and temperature conditions of your application. For example, if a lithium-ion battery's voltage falls to 3.5 V, the output can no longer hold 3.3 V and begins to drop. 3.0 V is the mistake of subtracting the dropout voltage instead of adding it.
Dropout voltage is the minimum input-output difference at which a regulator can still hold its output.
What does the dropout voltage of an LDO (low-dropout linear…Dropout voltage is the minimum voltage difference required between input and output to maintain the output voltage.
A 3.3 V output LDO has a dropout voltage specified as max 3…As an Amazon Associate I earn from qualifying purchases.
LDO 5 V tolerant Absolute maximum ratings Allowable power dissipation Derating Errata Exposed pad Input offset voltage MSL (moisture sensitivity level) Noise margin