Overview
The LM2931CDG 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, protecting against input fault conditions such as reverse battery connection, two battery jump starts, and excessive line transients during load dump.
Key Specifications
| Parameter | Conditions | Typical | Minimum | Maximum |
|---|---|---|---|---|
| Output Voltage (Fixed) | Vin = 14 V, IO = 10 mA, TA = 25°C | 5.0 V | 4.75 V | 5.25 V |
| Output Voltage (Fixed) | 6.0 V ≤ Vin ≤ 26 V, IO ≤ 100 mA, -40°C ≤ TJ ≤ 125°C | 5.0 V | 4.5 V | 5.5 V |
| Line Regulation | 9 V ≤ Vin ≤ 16 V | 10 mV | -2.0 mV | 10 mV |
| Load Regulation | 5 mA ≤ IO ≤ 100 mA | 50 mV | -14 mV | 50 mV |
| Output Impedance | IO = 10 mA, ΔIO = 1.0 mA, f = 100 Hz to 10 kHz | 200 mΩ | - | - |
| Bias Current | IO = 10 mA, 6 V ≤ Vin ≤ 26 V | 0.4 mA | - | 1.0 mA |
| Load Dump Protection | - | - | - | 60 V |
| Reverse Transient Protection | - | - | - | -50 V |
| Internal Current Limiting | - | - | - | Yes |
| Thermal Shutdown | - | - | - | Yes |
Key Features
- Input-to-Output Voltage Differential of < 0.6 V @ 100 mA
- Output Current in Excess of 100 mA
- Low Bias Current of 0.4 mA at 10 mA output
- 60 V Load Dump Protection
- -50 V Reverse Transient Protection
- Internal Current Limiting with Thermal Shutdown
- Temporary Mirror-Image Protection
- Output Inhibit Pin (for 'C' suffix adjustable output regulators)
- Ideally suited for battery powered industrial and consumer equipment
- Available in various packages including TO-220, TO-92, TO-263, and SOIC-8
Applications
- Automotive systems
- Battery powered consumer products
- Handheld instruments
- Memory standby power systems
- CMOS and other low power processor power supplies
- Industrial and consumer equipment requiring extended battery life
Q & A
- What is the typical output current of the LM2931CDG?
The LM2931CDG can supply output currents in excess of 100 mA.
- What is the input-to-output voltage differential of the LM2931CDG?
The input-to-output voltage differential is less than 0.6 V at 100 mA output current.
- Does the LM2931CDG have load dump protection?
Yes, the LM2931CDG has 60 V load dump protection.
- What kind of thermal protection does the LM2931CDG have?
The LM2931CDG features internal thermal shutdown.
- Is the LM2931CDG protected against reverse battery connection?
Yes, the LM2931CDG is protected against reverse battery connection and reverse transients up to -50 V.
- What packages are available for the LM2931CDG?
The LM2931CDG is available in packages such as TO-220, TO-92, TO-263, and SOIC-8.
- Does the LM2931CDG have an output inhibit feature?
Yes, the 'C' suffix adjustable output regulators feature an output inhibit pin.
- What is the typical bias current of the LM2931CDG at 10 mA output?
The typical bias current is 0.4 mA at 10 mA output.
- Can the LM2931CDG be used in microprocessor-based systems?
Yes, the output inhibit pin makes it extremely useful in microprocessor-based systems.
- What are the common applications of the LM2931CDG?
Common applications include automotive systems, battery powered consumer products, handheld instruments, and industrial equipment.
