Overview
The L4931CD120-TR is a very low drop voltage regulator produced by STMicroelectronics. This regulator is available in various packages, including SO-8, DPAK, PPAK, and TO-92, and offers a range of output voltages. The L4931 series is particularly suited for low noise, low power applications, especially in battery-powered systems, due to its very low dropout voltage (0.4 V) and very low quiescent current.
The device features a TTL compatible shutdown logic control function in PPAK and SO-8 packages, allowing for part of the board to be put in standby mode to reduce total power consumption. It requires only a 2.2 µF capacitor for stability, which helps in saving space and cost.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (V) | IO = 5 mA, VI = 14 V | 11.76 | 12 | 12.24 | V |
| Operating Input Voltage | IO = 250 mA | 20 | V | ||
| Output Current Limit | TA = 25 °C | 300 | mA | ||
| Line Regulation | VI = 12.8 to 20 V, IO = 0.5 mA | 20 | mV | ||
| Load Regulation | VI = 13 V, IO = 0.5 to 250 mA | 15 | mV | ||
| Quiescent Current (ON mode) | VI = 6 to 20 V, IO = 0 mA | 0.6 | 1 | mA | |
| Quiescent Current (OFF mode) | VI = 6 V | 50 | 100 | µA | |
| Dropout Voltage | IO = 250 mA | 0.4 | 0.6 | 0.8 | V |
| Temperature Range | -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 (TTL compatible in PPAK and SO-8 packages)
- Output voltages: 3.3 V, 3.5 V, 5 V, 12 V
- 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 L4931CD120-TR is particularly suitable for low noise, low power applications, including:
- Battery-powered systems
- Industrial automation
- Automotive systems (for automotive-grade versions)
- Consumer electronics requiring low power consumption and high efficiency
- Medical devices where low noise and low power are critical
Q & A
- What is the typical dropout voltage of the L4931CD120-TR?
The typical dropout voltage is 0.4 V.
- What is the maximum output current of the L4931CD120-TR?
The maximum output current is up to 250 mA.
- What is the quiescent current in OFF mode for the L4931CD120-TR?
The quiescent current in OFF mode is typically 50 µA.
- What is the operating temperature range of the L4931CD120-TR?
The operating temperature range is from -40 to 125 °C.
- Does the L4931CD120-TR have a shutdown function?
- What is the supply voltage rejection of the L4931CD120-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 capacitance is required for stability.
- What are the available output voltage options for the L4931 series?
The available output voltages are 3.3 V, 3.5 V, 5 V, and 12 V.
- Is the L4931CD120-TR available in automotive-grade?
No, the automotive-grade version is available only for the 3.3 V output voltage in SO-8 package.
- What is the maximum operating input voltage for the L4931CD120-TR?
The maximum operating input voltage is 20 V.
