Overview
The TLV431 series, including the TLV431BSN1T1, are precision low voltage shunt regulators produced by ON Semiconductor. These devices are programmable over a wide voltage range of 1.24V to 16V, making them versatile for various applications. The TLV431 series features high reference accuracy, with the TLV431B series, which includes the TLV431BSN1T1, offering a guaranteed reference accuracy of ±0.5% at 25°C and ±1.0% over the entire industrial temperature range of -40°C to 85°C. These regulators exhibit a sharp low current turn-on characteristic and a low dynamic impedance of 0.20 Ω over an operating current range of 0.1mA to 20mA.
Key Specifications
| Characteristic | Symbol | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Reference Voltage (at 25°C, IK = 10 mA) | Vref | V | 1.228 | 1.240 | 1.252 |
| Reference Voltage Tolerance (at 25°C) | - | - | ±0.5% | - | - |
| Reference Voltage Tolerance (over -40°C to 85°C) | - | - | ±1.0% | - | - |
| Cathode to Anode Voltage | VKA | V | - | - | 18 |
| Cathode Current Range, Continuous | IK | mA | -20 | - | 25 |
| Reference Input Current Range, Continuous | Iref | mA | 0.05 | - | 10 |
| Thermal Resistance, Junction-to-Ambient (TO-92 package) | RJA | °C/W | - | - | 178 |
Key Features
- Precision Reference Voltage: Guaranteed reference accuracy of ±0.5% at 25°C and ±1.0% over the industrial temperature range of -40°C to 85°C for the TLV431B series.
- Adjustable Output Voltage: Programmable output voltage range of 1.24V to 16V.
- Low Dynamic Impedance: 0.20 Ω over an operating current range of 0.1mA to 20mA.
- Sharp Low Current Turn-On Characteristic: Ideal for applications requiring precise voltage regulation at low currents.
- Compact Packaging: Available in TO-92, TSOP-5, and SOT23-3 packages.
- Pb-Free Packages Available: Compliant with lead-free requirements.
Applications
- Low Output Voltage Switching Power Supplies: Can be used as an error amplifier for controlling the feedback loop in isolated low output voltage switching power supplies.
- Voltage Monitoring: Suitable for voltage monitoring circuits due to its precise reference voltage.
- Current Source and Sink Circuits: Can be used in current source and sink circuits requiring stable voltage references.
- Analog and Digital Circuits: Ideal for analog and digital circuits that require precise reference voltages.
- Zener Diode Replacements: Excellent replacement for zener diodes in various applications.
- Power Supplies: Used in power supply circuits for voltage regulation.
- Smart Phone Chargers/Adapters: Can be used in smart phone chargers and adapters for precise voltage regulation.
Q & A
- What is the reference voltage accuracy of the TLV431B series at 25°C?
The reference voltage accuracy of the TLV431B series at 25°C is ±0.5%.
- What is the operating temperature range for the TLV431 series?
The operating temperature range for the TLV431 series is -40°C to 85°C.
- What is the dynamic impedance of the TLV431 series?
The dynamic impedance of the TLV431 series is 0.20 Ω over an operating current range of 0.1mA to 20mA.
- What are the available package types for the TLV431 series?
The TLV431 series is available in TO-92, TSOP-5, and SOT23-3 packages.
- Can the TLV431 be used as a replacement for zener diodes?
Yes, the TLV431 is an excellent replacement for zener diodes in numerous applications due to its precise reference voltage and low dynamic impedance.
- What is the maximum cathode to anode voltage for the TLV431 series?
The maximum cathode to anode voltage for the TLV431 series is 18V.
- What is the reference input current range for the TLV431 series?
The reference input current range for the TLV431 series is 0.05mA to 10mA.
- Is the TLV431 series Pb-free?
Yes, Pb-free packages are available for the TLV431 series.
- Can the TLV431 be used in low output voltage switching power supplies?
Yes, the TLV431 can be used as an error amplifier for controlling the feedback loop in isolated low output voltage switching power supplies.
- What are some common applications of the TLV431 series?
The TLV431 series is commonly used in voltage monitoring, current source and sink circuits, analog and digital circuits, and power supplies, among other applications.
