LT1019CS8-4.5#PBF

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Voltage references are electronic circuits in which the output potential is fixed, with no dependence on the load conditions or the power supply voltage. LT1019CS8-4.5#PBF is a popular voltage reference from Linear Technology that is widely used in applications such as low-noise precision sources and regulators, industrial controllers, system and network monitoring, digital controls, and power supplies. This voltage reference is capable of sourcing up to 4.5mA of output current and offers an accurate 1% initial accuracy. This article outlines the features and working principle of LT1019CS8-4.5#PBF voltage reference.

Features of LT1019CS8-4.5#PBF

LT1019CS8-4.5#PBF is a precision low-noise voltage reference that operates from 2.7V to 24V or with high accuracy across a wide range of temperatures. It features an internal bandgap reference and an output stage designed with advanced capacitor-multiplier techniques to provide a low thermal drift of less than 0.3mV/°C. The device can source up to 4.5mA of output current and dissipates low quiescent current of only 95μA. It features a precision 1% initial accuracy and a stable 0.1%/V line regulation.

The LT1019CS8-4.5#PBF can operate over a wide temperature range of -40°C to +125°C and offers an ultra-low 1ppm/°C long term stability and low-noise performance. It operates with a low noise of 3.2μVrms for a 10V output and has a low output impedance of 0.25Ω at 200kHz, making it suitable for high-precision applications. The device also offers an adjustable output voltage range of 0V to 25V and an adjustable slope compensation range of 10kHz to 10MHz. It is extremely easy to use and is offered in an 8-lead SOIC package.

Working Principle of LT1019CS8-4.5#PBF

LT1019CS8-4.5#PBF’s working principle is based on a standard bandgap reference circuit combined with an advanced capacitor multiplier output stage. It also features internal protection against reverse current and output current. The circuit is designed to maintain a constant voltage over a wide range of temperatures and load conditions.

The LT1019CS8-4.5#PBF’s bandgap reference circuit consists of a voltage reference source and a reference amplifier. The reference source produces a voltage of 2mV/V with a temperature coefficient of approximately 0.4mV/°C, which is stable and constant over a wide temperature range. The reference amplifier then amplifies this output voltage.

The output stage of the LT1019CS8-4.5#PBF consists of a precision low-noise current amplifier and a capacitor multiplier. The capacitor multiplier portion of the circuit multiplies the voltage output from the reference amplifier by a factor of approximately 1/2. This resulting voltage is then further amplified by the amplifier. The output voltage is regulated with the help of a voltage divider, which can be adjusted to provide an adjustable output voltage range.

The LT1019CS8-4.5#PBF provides very precise and stable outputs over wide temperature and load conditions, making it well suited for use in critical applications. It also features low power consumption, low noise, and adjustable current and voltage output ranges, making it an ideal choice for precision sources and regulators, industrial controllers, and power supplies.

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