Overview
The LM2931CD2TR4G is part of the LM2931 series, which consists of positive fixed and adjustable output low dropout (LDO) linear voltage regulators. These devices 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 external load circuitry from input fault conditions such as reverse battery connection, two battery jump starts, and excessive line transients during load dump. Additionally, these regulators include internal current limiting, thermal shutdown, and temporary mirror-image protection, making them ideal for battery-powered industrial and consumer equipment where extended battery life is desirable.
Key Specifications
| Characteristic | Symbol | Value | Unit |
|---|---|---|---|
| Input Voltage Continuous | VI | 40 | Vdc |
| Transient Input Voltage (t ≤ 100 ms) | VI(τ) | 60 | Vpk |
| Transient Reverse Polarity Input Voltage | −VI(τ) | −50 | Vpk |
| Output Current | IO | 100 | mA |
| Bias Current at 10 mA Output | IB | 0.4 | mA |
| Output Voltage Range (Adjustable) | VO range | 2.7 to 29.5 | V |
| Reference Voltage (IO = 10 mA, TA = 25°C) | Vref | 1.14 to 1.26 | V |
| Line Regulation (Vin = VO + 0.6 V to 26 V) | Regline | 2.0 | mV |
| Thermal Resistance, Junction-to-Ambient | RθJA | 178 | °C/W |
| Package Type | D2PAK-5 |
Key Features
- Low Dropout Voltage: Input-to-output voltage differential of less than 0.6 V at 100 mA output current.
- High Output Current: Capable of supplying output currents in excess of 100 mA.
- Low Bias Current: 0.4 mA at 10 mA output current.
- Load Dump Protection: 60 V load dump protection and -50 V reverse transient protection.
- Internal Protection: Internal current limiting and thermal shutdown.
- Mirror-Image Protection: Able to withstand temporary power-up with mirror-image insertion.
- Adjustable Output: The 'C' suffix models feature an adjustable output voltage range from 2.7 V to 29.5 V.
- Output Inhibit Pin: Useful in microprocessor-based systems for controlling the output voltage.
- High Accuracy Reference: Available with a high accuracy (+/-2%) reference voltage option.
Applications
- Automotive Systems: Designed to survive in harsh automotive environments, protecting against various fault conditions.
- Battery Powered Consumer Products: Ideal for extending the useful life of batteries in consumer devices.
- Handheld Instruments: Suitable for handheld devices requiring stable and efficient power supply.
- Industrial Equipment: Used in industrial applications where reliable and stable voltage regulation is crucial.
Q & A
- What is the maximum input voltage for the LM2931CD2TR4G?
The maximum continuous input voltage is 40 Vdc, with transient input voltage up to 60 Vpk for t ≤ 100 ms.
- What is the output current capability of the LM2931CD2TR4G?
The device can supply output currents in excess of 100 mA.
- What is the bias current at 10 mA output for the LM2931CD2TR4G?
The bias current is 0.4 mA at 10 mA output.
- What are the key protection features of the LM2931CD2TR4G?
The device features 60 V load dump protection, -50 V reverse transient protection, internal current limiting, and thermal shutdown).
- What is the output voltage range for the adjustable models of the LM2931 series?
The adjustable output voltage range is from 2.7 V to 29.5 V).
- What is the thermal resistance, junction-to-ambient for the D2PAK-5 package?
The thermal resistance, junction-to-ambient (RθJA) is 178 °C/W).
- In what types of applications is the LM2931CD2TR4G commonly used?
Common applications include automotive systems, battery-powered consumer products, handheld instruments, and industrial equipment).
- Does the LM2931CD2TR4G have an output inhibit pin?
- What is the package type for the LM2931CD2TR4G?
The package type is D2PAK-5).
- Is the LM2931CD2TR4G suitable for battery-powered devices?
