LM136H-2.5/NOPB

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Analog integrated circuits (ICS) are electronic circuits that are designed to help with a wide range of tasks. Examples of these tasks can include providing an interface with a microprocessor, determining the absolute value of a signal, or providing a level shift from one voltage to another. Voltage reference ICS are a type of analog ICS that are used to provide a stable reference voltage independent of the changes in temperature, current, and voltage around it. This article will focus on the LM136H-2.5/NOPB voltage reference ICS and will cover the application field and working principle.

Application Field

The LM136 is a fixed output voltage reference ICS with a nominal voltage of 2.5V and is designed to provide a stable voltage independent of changes in temperature, current, and voltage around it. This fixed output voltage reference can be used as a bandgap reference, providing an accurate voltage source for linear circuits, amplifiers, analog-to-digital converters, DACs, and comparators.

The LM136 offers excellent temperature stability and is designed to be operated over a wide range of ambient temperatures making it a great option for many applications. It can also reduce power dissipation compared to other voltage references allowing it to be used in battery-powered devices. Additionally, the LM136 has adjustable output current and a low output noise level.

The LM136 is widely used in a variety of electronic applications such as medical devices, portable instrumentation, data acquisition systems, automotive, and other consumer electronics.

Working Principle

The LM136 consists of an integrated circuit amplifier and temperature compensation network. It consists of three frequency compensated, internally compensated op-amps, implemented using high-voltage CMOS technology. The input common-mode voltage range is from ground to an internal voltage within the specified output voltage range.

The LM136 uses a unique circuit topology known as a bandgap reference. A bandgap reference produces an accurate output voltage that is substantially independent of the changes in temperature, current, and voltage around it. This is accomplished by combining two fractions of dissimilar N-type transistors and two resistive networks.

Essentially, the two fractions of dissimilar N-type transistors form a differential pair. When the differential pair is biased, the transconductance of each transistor can produce an output voltage that is proportional to the applied voltage. The two resistive networks are designed to cancel out the effects of temperature and other variations. The output voltage is also buffered through MOSFETS.

The LM136 can also be used as a voltage follower with an adjustable current limit. The current limit is adjustable in discrete steps using an external resistor. This function provides a regulated current to the output under dynamic conditions. This feature is especially useful when the LM136 is used as a level-shifter.

Overall, the LM136H-2.5/NOPB is a fixed-output voltage reference ICS that provides excellent temperature stability and a wide operating temperature range. It can be used in a variety of applications and provides a stable voltage source for linear circuits, amplifiers, ADC’s, DAC’s, and comparators. Additionally, it can be used as a voltage follower with adjustable current limit.

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