Specifications
SKU: 11291544
LM431AIM3X Voltage Reference Power Management IC 2.495 V ~ 37 V SOT-23 marking N1E Adjustable ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Parameter | Symbol | Min | Typ | Max | Unit |
---|---|---|---|---|---|
Operating Voltage | Vref | 2.50 | 2.50 | 2.50 | V |
Operating Current | Iop | 0.4 | 1.0 | 1.5 | mA |
Cathode Current | Ik | 0.1 | 1.0 | 15.0 | mA |
Reference Voltage | Vref | 2.495 | 2.500 | 2.505 | V |
Temperature Coefficient | Tc | -10 | -3 | 0 | ppm/°C |
Output Impedance | Zout | 0.2 | 0.25 | 0.3 | Ω |
Storage Temperature | Tstg | -65 | - | 150 | °C |
Operating Junction Temp | Tj | -40 | - | 150 | °C |
Instructions for Use:
Circuit Configuration:
- The LM431 is typically used as a precision adjustable shunt regulator.
- Connect the cathode (K) to the reference voltage, the anode (A) to ground, and the reference (R) to the control point.
Setting the Output Voltage:
- The output voltage can be adjusted using two external resistors, R1 and R2, connected between the reference (R) and cathode (K) pins.
- The formula to calculate the output voltage (Vout) is: [ V_{text} = V_{text} left(1 + fracright) ]
- Ensure that the cathode current (Ik) is within the specified range to maintain regulation.
Thermal Considerations:
- Ensure adequate heat dissipation if operating at high currents or in high-temperature environments.
- The maximum junction temperature (Tj) should not exceed 150°C.
Stability:
- To ensure stability, a bypass capacitor (typically 1 μF) should be placed between the cathode (K) and anode (A) pins.
- For high-frequency applications, a smaller capacitor (e.g., 0.1 μF) may be used.
Storage and Handling:
- Store the device in a dry, cool place.
- Handle with care to avoid damage to the pins and the device itself.
Electrostatic Discharge (ESD) Protection:
- The device is sensitive to ESD. Use proper grounding and handling techniques to prevent damage.
Mounting:
- Ensure proper mounting on the PCB to avoid mechanical stress on the leads.
- Follow the recommended soldering profile to prevent thermal damage during assembly.
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