Overview
The LM2931ACDG is a part of the LM2931 series, which consists of positive fixed and adjustable output low dropout (LDO) linear voltage regulators. These regulators are designed to maintain proper regulation with an extremely low input-to-output voltage differential. They are capable of supplying output currents in excess of 100 mA and feature a low bias current of 0.4 mA at 10 mA output. The LM2931 series is primarily designed to survive in harsh automotive environments and protects external load circuitry from various input fault conditions such as reverse battery connection, two battery jump starts, and excessive line transients during load dump. The 'C' suffix adjustable output regulators, like the LM2931ACDG, include an output inhibit pin, which is particularly useful in microprocessor-based systems.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage Continuous | VI | - | - | 40 | Vdc |
| Transient Input Voltage (t ≤ 100 ms) | VI(t) | - | - | 60 | Vpk |
| Transient Reverse Polarity Input Voltage | -VI(t) | -50 | - | - | Vpk |
| Output Voltage (Adjustable) | VO range | 2.7 | - | 29.5 | V |
| Reference Voltage | Vref | 1.14 | 1.20 | 1.26 | V |
| Output Current | IO | - | - | 100 | mA |
| Line Regulation | Regline | - | - | 2.0 | mV |
| Quiescent Current | Iq | - | 0.4 | 1.0 | mA |
| Thermal Resistance, Junction-to-Ambient | RθJA | - | - | 178 | °C/W |
| Package Type | - | - | - | SOIC-8 | - |
Key Features
- Low input-to-output voltage differential of less than 0.6 V at 100 mA output current.
- Output current in excess of 100 mA.
- Low bias current of 0.4 mA at 10 mA output.
- 60 V load dump protection and -50 V reverse transient protection.
- Internal current limiting and thermal shutdown protection.
- Temporary mirror-image insertion protection.
- Output inhibit pin for adjustable output versions, useful in microprocessor-based systems.
- High accuracy (+/-2%) reference voltage for certain models.
- Available in various packages including TO-220, TO-92, TO-263, and SOIC-8.
Applications
- Battery powered consumer products.
- Handheld instruments.
- Automotive systems, particularly those requiring robust protection against harsh environments.
- Memory standby circuits and CMOS processor power supplies).
- Industrial and consumer equipment where extended battery life is desirable).
Q & A
- What is the maximum output current of the LM2931ACDG?
The LM2931ACDG can supply output currents in excess of 100 mA).
- What is the input-to-output voltage differential of the LM2931ACDG?
The input-to-output voltage differential is less than 0.6 V at 100 mA output current).
- Does the LM2931ACDG have protection against reverse battery connection?
- What is the quiescent current of the LM2931ACDG?
The quiescent current is 0.4 mA at 10 mA output).
- In what packages is the LM2931ACDG available?
The LM2931ACDG is available in the SOIC-8 package).
- Does the LM2931ACDG have an output inhibit pin?
- What is the thermal shutdown protection feature of the LM2931ACDG?
The LM2931ACDG includes internal thermal shutdown protection to prevent overheating).
- Can the LM2931ACDG withstand temporary mirror-image insertion?
- What are the typical applications of the LM2931ACDG?
- What is the reference voltage range for the adjustable output of the LM2931ACDG?
