LM431AIM3X Rectifier Diode Adjustable Precision Zener Shunt Regulator

LM431 Adjustable Precision Zener Shunt Regulator

General Description

The LM431 is a 3-terminal adjustable shunt regulator with guaranteed temperature stability over the entire temperature range of operation. It is now available in a chip sized package (4-Bump micro SMD) using National’s micro SMD package technology. The output voltage may be set at any level greater than 2.5V (V_REF) up to 36V merely by selecting two external resistors that act as a voltage divided network. Due to the sharp turn-on characteristics this device is an excellent replacement for many zener diode applications.

Features

• Average temperature coefficient 50 ppm/˚C

• Temperature compensated for operation over the full temperature range

• Programmable output voltage

• Fast turn-on response

• Low output noise

• LM431 in micro SMD package

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Storage Temperature Range                                        −65˚C to +150˚C

Operating Temperature Range

    Industrial (LM431xI)                                                     −40˚C to +85˚C

    Commercial (LM431xC)                                                   0˚C to +70˚C

Soldering Information

    Infrared or Convection (20 sec.)                                                235˚C

    Wave Soldering (10 sec.)                                        260˚C (lead temp.)

Cathode Voltage                                                                              37V

Continuous Cathode Current                                     −10 mA to +150 mA

Reference Voltage                                                                         −0.5V

Reference Input Current                                                                10 mA

Internal Power Dissipation (Notes 3, 4)

    TO-92 Package                                                                        0.78W

    SO-8 Package                                                                          0.81W

    SOT-23 Package                                                                      0.28W

    micro SMD Package                                                                 0.30W

Operating Conditions

                                                                       Min             Max

Cathode Voltage                                            V_REF           37V

Cathode Current                                           1.0 mA        100 mA

Connection Diagrams

Symbol and Functional Diagrams

DC Test Circuits

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