Overview
The L4931CDT33 is a very low drop voltage regulator produced by STMicroelectronics. It is available in the DPAK package and is part of the L4931 series, which is known for its very low dropout voltage and low quiescent current. This regulator is particularly suitable for low noise, low power applications, especially in battery-powered systems. It features a TTL compatible shutdown logic control function, which allows for reducing total power consumption by putting parts of the board into standby mode.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (nom) | 3.3 | V |
| Output Tolerance (typ) | ±1% (AB) or ±2% (C) | % |
| Output Current (nom) | 0.25 | A |
| Dropout Voltage | 0.4 | V |
| Quiescent Current (ON mode) | 600 µA | µA |
| Quiescent Current (OFF mode) | 50 µA | µA |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage Rejection (typ) | 70 dB at 1 kHz | dB |
| Package | DPAK | |
| RoHS Compliance Grade | Ecopack2 |
Key Features
- Very low dropout voltage (0.4 V)
- Very low quiescent current (Typ. 50 µA in OFF mode, 600 µA in ON mode)
- Output current up to 250 mA
- Logic controlled electronic shutdown
- Internal current and thermal limit
- Only 2.2 µF capacitor required for stability
- Supply voltage rejection: 70 dB typ. for 5 V version
- Temperature range: from -40 to 125 °C
Applications
The L4931CDT33 is ideal for low noise, low power applications, particularly in battery-powered systems. It is suitable for use in various industrial and automotive applications where low dropout voltage and low quiescent current are critical. Other potential applications include local voltage regulation in larger systems, where the ability to put parts of the board into standby mode is beneficial.
Q & A
- What is the typical dropout voltage of the L4931CDT33? The typical dropout voltage is 0.4 V.
- What is the maximum output current of the L4931CDT33? The maximum output current is up to 250 mA.
- What is the quiescent current in ON and OFF modes? The quiescent current is typically 600 µA in ON mode and 50 µA in OFF mode.
- What is the operating temperature range of the L4931CDT33? The operating temperature range is from -40 to 125 °C.
- What package is the L4931CDT33 available in? The L4931CDT33 is available in the DPAK package.
- Does the L4931CDT33 have a shutdown feature? Yes, it has a TTL compatible shutdown logic control function.
- What is the supply voltage rejection of the L4931CDT33? The supply voltage rejection is typically 70 dB at 1 kHz for the 5 V version.
- How much capacitance is required for stability? Only 2.2 µF capacitor is required for stability.
- Is the L4931CDT33 RoHS compliant? Yes, it is RoHS compliant with an Ecopack2 grade.
- What are the typical output voltage tolerances? The output voltage tolerances are ±1% (AB) or ±2% (C) at 25 °C.
