Overview
The TLV431ALPG is a precision low-voltage shunt regulator produced by onsemi. It is part of the TLV431 series, which are three-terminal, adjustable shunt regulators known for their excellent temperature stability and output current handling capability up to 20mA. The TLV431ALPG is specifically designed for low-voltage operation, with a reference voltage (VREF) of 1.24V and an adjustable output voltage range from 1.24V to 16V. This device is ideal for applications requiring precise voltage references and can be used as a replacement for zener diodes in many circuits.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Reference Voltage (VREF) | 1.24V | |
| Adjustable Output Voltage Range | 1.24V to 16V | |
| Reference Voltage Tolerance at 25°C | 1.0% (TLV431A) | |
| Temperature Range | -40°C to 85°C | Industrial temperature range |
| Output Current Range | 0.1mA to 20mA | |
| Dynamic Output Impedance | 0.20Ω (typical) | Over the operating current range |
| Minimum Cathode Current | 80µA (typical) | |
| Package Types | TO-92, TSOP-5, SOT-23-3 | |
| Lead-Free and RoHS Compliant | Yes |
Key Features
- Low-voltage operation with VREF = 1.24V
- Adjustable output voltage from 1.24V to 16V using external resistors
- Sharp low current turn-on characteristic
- Low dynamic output impedance of 0.20Ω
- High accuracy: 1.0% for TLV431A, 0.5% for TLV431B, and 0.2% for TLV431C at 25°C
- Temperature stability over -40°C to 85°C range
- Ultra-small packages including TSOP-5 and SOT-23-3
- Pb-free and RoHS compliant
Applications
- Isolated low-output voltage power supplies
- Improving the accuracy and/or extending the range and flexibility of fixed-voltage regulators
- Voltage monitoring and current source/sink circuits
- Analog and digital circuits requiring precision references
- Low-voltage zener diode replacements
- Power supplies, including smartphone chargers and adapters
Q & A
- What is the reference voltage of the TLV431ALPG?
The reference voltage (VREF) of the TLV431ALPG is 1.24V.
- What is the adjustable output voltage range of the TLV431ALPG?
The output voltage can be adjusted from 1.24V to 16V using external resistors.
- What are the temperature range and stability of the TLV431ALPG?
The device operates over a temperature range of -40°C to 85°C with specified thermal stability.
- What is the typical output impedance of the TLV431ALPG?
The typical output impedance is 0.20Ω over the operating current range.
- Can the TLV431ALPG be used as a replacement for zener diodes?
Yes, it is an excellent replacement for low-voltage zener diodes due to its sharp turn-on characteristic and low dynamic impedance.
- What are the package options available for the TLV431ALPG?
The device is available in TO-92, TSOP-5, and SOT-23-3 packages.
- Is the TLV431ALPG RoHS compliant and lead-free?
Yes, it is RoHS compliant and lead-free.
- What is the minimum cathode current required for the TLV431ALPG?
The minimum cathode current is 80µA (typical).
- Can the TLV431ALPG be used in isolated feedback circuits for switching power supplies?
Yes, when used with an optocoupler, it is ideal for isolated feedback circuits in 3V to 3.3V switching-mode power supplies.
- What are some common applications of the TLV431ALPG?
Common applications include isolated low-output voltage power supplies, voltage monitoring, current source/sink circuits, and analog/digital circuits requiring precision references.
