Overview
The LM2931AD33R is a very low drop voltage regulator produced by STMicroelectronics. It is designed to provide a fixed output voltage of 3.3V and is particularly suitable for low noise, low power applications and battery-powered systems. The regulator features a very low dropout voltage and low quiescent current, making it ideal for extending the useful life of batteries in various devices. The LM2931AD33R is available in several package options, including SO-8, DPAK, and TO-92, with the SO-8 package being fully compatible with the older L78L family and offering a shutdown logic control function.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage | 3.175 | 3.3 | 3.425 | V |
| Maximum Operating Input Voltage | - | - | 26 | V |
| Output Current | - | - | 100 mA | mA |
| Dropout Voltage (IO = 10 mA) | - | 90 mV | 200 mV | mV |
| Dropout Voltage (IO = 100 mA) | - | 250 mV | 600 mV | mV |
| Quiescent Current (ON Mode, IO = 100 mA) | 2.5 mA | - | 30 mA | mA |
| Quiescent Current (OFF Mode) | 0.3 mA | - | 1 mA | mA |
| Operating Junction Temperature Range | -40°C | - | 125°C | °C |
| Transient Input Voltage (t < 100 ms) | - | - | 60 V | V |
| Reverse Polarity Input Voltage Transient (t < 100 ms) | -50 V | - | - | V |
Key Features
- Very low dropout voltage (typ. 90 mV at 10 mA load)
- Low quiescent current (typ. 2.5 mA at 100 mA load)
- Output current up to 100 mA
- Fixed 3.3 V output voltage version
- Internal current and thermal limit
- Load dump protection up to 60 V
- Reverse transient protection up to -50 V
- Shutdown logic control function in SO-8 package
- AEC-Q100 qualified (DPAK only)
- Low output noise voltage (330 µVRMS from 10 Hz to 100 kHz)
Applications
The LM2931AD33R is designed for various applications, particularly in harsh environments such as:
- Automotive systems: It protects against reverse battery connections, two battery jump starts, and excessive line transients during load dump.
- Battery-powered industrial and consumer equipment: Its low dropout voltage and low quiescent current make it ideal for extending battery life.
- Low noise, low power systems: Suitable for applications requiring minimal power consumption and low noise levels.
Q & A
- What is the typical dropout voltage of the LM2931AD33R?
The typical dropout voltage is 90 mV at a 10 mA load.
- What is the maximum output current of the LM2931AD33R?
The maximum output current is 100 mA.
- What are the available package options for the LM2931AD33R?
The available packages are SO-8, DPAK, and TO-92.
- Is the LM2931AD33R AEC-Q100 qualified?
Yes, it is AEC-Q100 qualified, but only in the DPAK package.
- What is the operating junction temperature range of the LM2931AD33R?
The operating junction temperature range is -40°C to 125°C.
- Does the LM2931AD33R have load dump protection?
Yes, it has load dump protection up to 60 V.
- What is the quiescent current in ON mode at 100 mA load?
The quiescent current in ON mode at 100 mA load is typically 2.5 mA.
- Does the LM2931AD33R have a shutdown logic control function?
Yes, the SO-8 package includes a shutdown logic control function.
- What is the reverse polarity input voltage transient protection?
The regulator can withstand reverse polarity input voltage transients up to -50 V.
- What is the output noise voltage of the LM2931AD33R?
The output noise voltage is 330 µVRMS from 10 Hz to 100 kHz.
