LM385Z/NOPB

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The LM385Z/NOPB is a voltage reference integrated circuit in PMIC - Voltage Reference family from Texas Instruments. It is designed to provide precise, low cost, temperature-stable reference voltages in applications such as voltage regulation, current limiting, overvoltage detection, and ADC reference generation. It contains two voltage references with two output pins, one at +2.5 volts and one at -2.5 volts, as well as an output current limiter. The device operates from a single supply voltage of +3.0V to +25V and also requires an output filter capacitor for stability.

The LM385Z/NOPB has a wide range of applications such as voltage regulation, current limiting, overvoltage detection and ADC reference generation. Its high-precision references provide precise reference voltages in adjustable circuits and can be used to set the regulated voltage of a regulated DC power supply, voltage dividers and instrumentation amplifiers. It can also be used in AC-to-DC power converters by setting a fixed offset voltage and an operational amplifier configured with a gain of +1 as a voltage regulator in applications such as battery-powered devices.

The LM385Z/NOPB offers low temperature drift and low noise, making it suitable for precision measurement and calibration applications. It usually requires an additional capacitor for stability, and its reference voltage accuracy is typically 0.2%. For best thermal stability, the LM385Z/NOPB is operated at or near its clip current rating when it is used in a voltage reference application.

The LM385Z/NOPB works by using an input voltage to set an output voltage by means of a transistor, forming a series-type voltage comparator. The output voltage is a fraction of the input voltage, controlled by the emitter base voltage of the transistor, which is derived from the reference voltage. This reference voltage is maintained by a precision bandgap reference and current source configuration, allowing for very precise voltage reference accuracy. The output voltage of the device is also adjustable by adjusting the current into the reference pin.

The LM385Z/NOPB can also be used in applications where extremely low temperature drifts are essential, such as in A/D conversions, or in circuits where the output voltage needs to be held with linearity and accuracy. With the added external compensation capacitor, the LM385Z/NOPB’s temperature drift is negligible, typically exhibiting less than 0.1% drift in 1°C to 3°C temperature range, making it ideal for temperature calibrated circuits.

The LM385Z/NOPB also features an output current limiter, which helps limit the maximum current drawn through the output pins while a voltage load is applied. In addition, the LM385Z/NOPB’s output current limiting allows it to be used in applications where the power supply voltage must be maintained at a particular level. The device also features a full-scale accuracy of 0.5%, which helps ensure precise regulation of power supply voltages.

In conclusion, the LM385Z/NOPB from Texas Instruments is an excellent voltage reference device for applications that require precise regulation of power supply voltages, or for precision measurement and calibration. It offers high precision, temperature compensated references and adjustable output currents. Its output current limiter also helps keep the power supply voltage at its intended level. The LM385Z/NOPB is an ideal choice for precision applications that require accurate, temperature-compensated voltage references.

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