Overview
The LM431BIM3/NOPB is an adjustable precision shunt voltage regulator produced by Texas Instruments. This device is designed to provide high accuracy and stability over a wide temperature range. It is available in a SOT-23 package, making it suitable for space-critical applications. The LM431BIM3/NOPB is part of the LM431 series, which offers adjustable output voltages from 2.5 V to 37 V, making it versatile for various voltage regulation needs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature Range | -40 | 85 | °C | |
| Minimum Operating Current | 1 | mA | ||
| Maximum Operating Current | 100 | mA | ||
| Reference Voltage (VREF) | 2.5 | V | ||
| Dynamic Output Impedance (rZ) | 0.5 | Ω | ||
| ESD Rating (Human-body model) | ±2500 | V | ||
| Package Type | SOT-23 | |||
| Lead Finish/Ball Material | Cu SN | |||
| Moisture Sensitivity Level (MSL) | Level-1-260C-UNLIM |
Key Features
- Adjustable output voltage from 2.5 V to 37 V using external resistors.
- High accuracy and temperature stability over the entire operating temperature range.
- Low dynamic output impedance.
- Small quiescent current requirement for regulation.
- Available in space-saving SOT-23, SOIC-8, and TO-92 packages.
- RoHS and Green compliant (no Chlorine or Bromine based flame retardants).
- Optional external capacitor for noise reduction on the input or output.
Applications
The LM431BIM3/NOPB is suitable for a variety of applications requiring precise voltage regulation, including:
- Power supplies and voltage regulators.
- Instrumentation and measurement equipment.
- Telecommunication systems.
- Aerospace and defense systems.
- Industrial control systems.
Q & A
- What is the operating temperature range of the LM431BIM3/NOPB?
The operating temperature range is -40°C to 85°C.
- What is the minimum and maximum operating current for the LM431BIM3/NOPB?
The minimum operating current is 1 mA, and the maximum operating current is 100 mA.
- How is the output voltage of the LM431BIM3/NOPB adjusted?
The output voltage is adjusted using external resistors (R1 and R2) based on the internal reference voltage (VREF).
- What is the typical dynamic output impedance of the LM431BIM3/NOPB?
The typical dynamic output impedance is 0.5 Ω.
- Is the LM431BIM3/NOPB RoHS and Green compliant?
Yes, it is RoHS and Green compliant, meaning it does not contain Chlorine or Bromine based flame retardants.
- What package types are available for the LM431 series?
The LM431 series is available in SOT-23, SOIC-8, and TO-92 packages.
- What is the ESD rating of the LM431BIM3/NOPB?
The ESD rating is ±2500 V according to the Human-body model.
- Can an external capacitor be used with the LM431BIM3/NOPB?
Yes, an external capacitor can be used on the input or output to reduce noise, although it is not required.
- What are the key considerations for selecting the series resistor (RS) in a shunt regulator application?
RS must be selected based on the supply voltage, desired load and operating current, and the output voltage to ensure the minimum acceptable current through the LM431 and to prevent exceeding the maximum current limit.
- What is thermal hysteresis in the context of the LM431BIM3/NOPB?
Thermal hysteresis refers to the change in output voltage measured after thermal cycling, which can be influenced by environmental storage, operating, and board mounting temperatures.
