Overview
The L4931ABD120TR is a very low drop voltage regulator produced by STMicroelectronics. It is part of the L4931 series, which is known for its very low dropout voltage and low quiescent current, making it suitable for low noise, low power applications, especially in battery-powered systems.
This regulator is available in various packages, including SO-8, DPAK, and TO-92, and offers a range of output voltages. The L4931ABD120TR specifically provides an output voltage of 12V, although the '120' in the part number seems to be a misinterpretation since the standard output voltages for this series are 3.3V, 3.5V, and 5V. However, the general features and specifications apply broadly across the series.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (nom) | Typically 3.3V, 3.5V, 5V (Note: The '120' in the part number is likely incorrect for this series) | V |
| Output Tolerance (typ) | ±1% (AB) or ±2% (C) at 25°C | % |
| Output Current (nom) | Up to 250 mA | mA |
| Droopout Voltage | 0.4 V | V |
| Quiescent Current | Typ. 50 µA in OFF mode, 600 µA in ON mode | µA |
| Operating Temperature Range | -40 to 125 °C | °C |
| Supply Voltage Rejection | 70 dB typ. for 5 V version | dB |
| Package | SO-8, DPAK, TO-92 |
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
- High supply voltage rejection (70 dB typ. for 5 V version)
- Wide operating temperature range (-40 to 125 °C)
Applications
The L4931 series is particularly suitable for low noise, low power applications and especially in battery-powered systems. It is ideal for use in:
- Battery-powered devices
- Low power consumer electronics
- Industrial automation systems
- Automotive systems (for automotive-grade versions)
- Any application requiring low dropout voltage and low quiescent current
Q & A
- What is the typical dropout voltage of the L4931 regulator?
The typical dropout voltage is 0.4 V.
- What are the available output voltages for the L4931 series?
The available output voltages are typically 3.3V, 3.5V, and 5V.
- What is the maximum output current of the L4931 regulator?
The maximum output current is up to 250 mA.
- What is the quiescent current in ON and OFF modes?
The quiescent current is typically 50 µA in OFF mode and 600 µA in ON mode.
- What is the operating temperature range of the L4931 regulator?
The operating temperature range is from -40 to 125 °C.
- Does the L4931 have a shutdown feature?
- What is the supply voltage rejection of the L4931 regulator?
The supply voltage rejection is typically 70 dB for the 5 V version.
- What packages are available for the L4931 regulator?
The regulator is available in SO-8, DPAK, and TO-92 packages.
- How much capacitance is required for stability?
Only 2.2 µF capacitor is required for stability.
- Is the L4931 suitable for battery-powered systems?
