Overview
The L4931CD33 is a very low drop voltage regulator produced by STMicroelectronics. It is available in various packages, including SO-8, DPAK, 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 device features a very low dropout voltage of 0.4 V and a very low quiescent current, making it ideal for applications where power efficiency is crucial.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (nominal) | 3.3 | V |
| Output Tolerance (typical) | ±1% (AB) or ±2% (C) at 25 °C | % |
| Output Current (nominal) | 250 mA | mA |
| Dropout Voltage | 0.4 V | V |
| Quiescent Current (ON mode) | 600 µA | µA |
| Quiescent Current (OFF mode) | 50 µA | µA |
| Operating Input Voltage | Up to 20 V | V |
| Operating Temperature Range | -40 to 125 °C | °C |
| Supply Voltage Rejection (typical) | 70 dB at 1 kHz for 5 V version | dB |
| Output Noise Voltage | 50 µV (B = 10 Hz to 100 kHz) | µV |
| 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 (available in PPAK and SO-8 packages)
- 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 L4931CD33 is suitable for a variety of applications, including:
- Low noise, low power systems
- Battery-powered devices
- Industrial automation
- Automotive systems (specific models like L4931CD33-TRY)
- Portable electronics
Q & A
- What is the typical dropout voltage of the L4931CD33?
The typical dropout voltage is 0.4 V.
- What is the maximum output current of the L4931CD33?
The maximum output current is 250 mA.
- What are the available output voltages for the L4931 series?
The available output voltages are 3.3 V, 3.5 V, and 5 V.
- What is the operating temperature range of the L4931CD33?
The operating temperature range is from -40 to 125 °C.
- Does the L4931CD33 have a shutdown feature?
- 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 supply voltage rejection of the L4931CD33?
The supply voltage rejection is typically 70 dB at 1 kHz for the 5 V version.
- What type of packages are available for the L4931CD33?
The device is available in SO-8, DPAK, and TO-92 packages.
- Is the L4931CD33 RoHS compliant?
- What is the recommended capacitor value for stability?
A 2.2 µF capacitor is recommended for stability.
