ST431 2.5V Adjustable Precision Voltage Reference
Specifications
Cathode Voltage2.5~36V (programmable; max 40V)
Cathode Current1~100mA
Reference Voltage2.5V
Reference Accuracy0.4% (A) / 1.0% (B)
Min. Cathode Current for Regulation1.0mA (typ 0.4mA)
PackageTO-92, SOT23-3
Product details
Overview
The ST431 series ICs are three-terminal adjustable shunt regulators with guaranteed thermal stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger and other adjustable regulators. The ST431 voltage rating is 40V, and the output voltage can be set to any value between VREF (2.5V) and the corresponding maximum cathode voltage. The ST431 precision reference is offered in two band-gap tolerance grades: 0.4% and 1.0%.
Features
- Programmable precise output voltage from 2.5V to 36V
- Very accurate reference voltage: 0.15% typical
- High stability under capacitive load
- Low temperature deviation: 4.5mV typical
- Low equivalent full-range temperature coefficient: 20ppm/°C typical
- Low dynamic output resistance: 0.2Ω typical
- Sink current capacity from 1mA to 100mA
- Low output noise
- Wide operating range of -40°C to 150°C
- TO-92 and SOT23-3 packages
Typical Applications
- Chargers
- Voltage adapters
- Switching power supplies
- Graphic cards
- Precision voltage references
