Overview
The LM431SBIMFX is a programmable shunt regulator produced by onsemi. It is part of the LM431 series, which includes the LM431SA, LM431SB, and LM431SC models. These devices are three-terminal adjustable regulators known for their thermal stability over a wide operating temperature range. The LM431SBIMFX allows for the output voltage to be set to any value between approximately 2.5 V and 36 V using two external resistors, making it highly versatile for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage Range | 2.5 V to 36 V | V |
| Output Voltage Tolerance | 1% | % |
| Dynamic Output Impedance (Typical) | 0.2 Ω | Ω |
| Sink Current Capability | 1.0 to 100 mA | mA |
| Temperature Coefficient (Typical) | 50 ppm/°C | ppm/°C |
| Operating Temperature Range | -40°C to +85°C | °C |
| Storage Temperature Range | -65°C to +150°C | °C |
| Package Type | SOT-23FL | |
| Thermal Resistance Junction-Air | 350 °C/W | °C/W |
| Power Dissipation | 350 mW | mW |
| Junction Temperature | 150 °C | °C |
Key Features
- Programmable Output Voltage: The output voltage can be set to any value between approximately 2.5 V and 36 V using two external resistors.
- Low Dynamic Output Impedance: Typical dynamic output impedance of 0.2 Ω, ensuring stable voltage regulation.
- Sink Current Capability: Can sink current in the range of 1.0 to 100 mA.
- Temperature Stability: Equivalent full-range temperature coefficient of 50 ppm/°C, ensuring stable operation over the entire operating temperature range.
- Low Output Noise Voltage: Minimal noise in the output voltage, making it suitable for precision applications.
- Fast Turn-on Response: Active output circuit provides a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Environmental Compliance: Pb-free, halogen-free/BFR-free, and RoHS compliant.
Applications
The LM431SBIMFX is suitable for a wide range of applications due to its adjustable output voltage and thermal stability. Some common applications include:
- Voltage Regulation: Used in voltage regulation circuits where a precise and adjustable output voltage is required.
- Replacement for Zener Diodes: Its sharp turn-on characteristic and low dynamic output impedance make it an excellent replacement for Zener diodes in many applications.
- Space-Critical Applications: Available in space-saving packages such as SOT-23FL, making it ideal for applications where board space is limited.
- Precision Instrumentation: Suitable for precision instrumentation due to its low output noise voltage and temperature stability.
Q & A
- What is the output voltage range of the LM431SBIMFX?
The output voltage can be set to any value between approximately 2.5 V and 36 V using two external resistors.
- What is the typical dynamic output impedance of the LM431SBIMFX?
The typical dynamic output impedance is 0.2 Ω.
- What is the sink current capability of the LM431SBIMFX?
The device can sink current in the range of 1.0 to 100 mA.
- What is the operating temperature range of the LM431SBIMFX?
The operating temperature range is -40°C to +85°C.
- Is the LM431SBIMFX RoHS compliant?
Yes, the LM431SBIMFX is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What packages are available for the LM431SBIMFX?
The device is available in the SOT-23FL package.
- How do I set the output voltage of the LM431SBIMFX?
The output voltage can be set using two external resistors (R1 and R2) based on the internal reference voltage (VREF) and the ratio of these resistors.
- What are some common applications of the LM431SBIMFX?
Common applications include voltage regulation, replacement for Zener diodes, space-critical applications, and precision instrumentation.
- What is the thermal resistance junction-air of the LM431SBIMFX in the SOT-23FL package?
The thermal resistance junction-air is 350 °C/W.
- What is the maximum power dissipation of the LM431SBIMFX?
The maximum power dissipation is 350 mW.
