Overview
The L4931CD35-TR is a very low drop voltage regulator produced by STMicroelectronics. It is available in various packages, including SO-8, DPAK, PPAK, and TO-92, and offers a range of output voltages. This regulator is particularly suited for low noise, low power applications, especially in battery-powered systems. The very low dropout voltage of 0.4 V and the very low quiescent current make it an ideal choice for reducing power consumption and enhancing system efficiency.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (V) | 3.465 | 3.5 | 3.535 | V |
| Operating Input Voltage (V) | - | - | 20 | V |
| Output Current Limit (mA) | - | - | 300 | mA |
| Line Regulation (mV) | 3 | - | 17.5 | mV |
| Load Regulation (mV) | 3 | - | 15 | mV |
| Quiescent Current (µA) | 50 | 600 | 1000 | µA |
| Dropout Voltage (V) | 0.4 | - | 0.6 | V |
| Supply Voltage Rejection (dB) | 70 | - | - | dB |
| Operating Temperature Range (°C) | -40 | - | 125 | °C |
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 (available in PPAK and SO-8 packages)
- Internal current and thermal limit
- Only 2.2 µF capacitor required for stability
- Available in ± 1 % (AB) or 2 % (C) selection at 25 °C
- Supply voltage rejection: 70 dB typ. for 5 V version
- Temperature range: from -40 to 125 °C
Applications
The L4931CD35-TR is suitable for a variety of applications, including:
- Battery-powered systems where low power consumption is critical.
- Low noise, low power electronic devices.
- Industrial and automotive systems requiring high reliability and efficiency.
- Local voltage regulation in larger systems to reduce power consumption and heat generation.
Q & A
- What is the typical dropout voltage of the L4931CD35-TR?
The typical dropout voltage is 0.4 V.
- What is the maximum output current of the L4931CD35-TR?
The maximum output current is up to 250 mA.
- What is the quiescent current in OFF mode?
The quiescent current in OFF mode is typically 50 µA.
- What is the operating temperature range of the L4931CD35-TR?
The operating temperature range is from -40 to 125 °C.
- Does the L4931CD35-TR have a shutdown feature?
- What is the supply voltage rejection of the L4931CD35-TR?
The supply voltage rejection is typically 70 dB for the 5 V version.
- How much capacitance is required for stability?
Only 2.2 µF capacitor is required for stability.
- Is the L4931CD35-TR available in automotive-grade?
The L4931 is available as automotive-grade in the SO-8 package only.
- What are the available output voltages for the L4931 series?
The available output voltages include 3.3 V, 3.5 V, and 5 V.
- What is the thermal resistance junction-case for the SO-8 package?
The thermal resistance junction-case for the SO-8 package is 8 °C/W.
