LM4040D50ILP

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Voltage references are essential components in power management integrated circuits (PMICs) that ensure precise voltage levels and signal accuracy. The LM4040D50ILP is a 3-terminal PMIC voltage reference, specifically designed for use in shunt reference and precision current sense applications like battery monitors. This type of voltage reference offers excellent line and load regulation performance, providing accuracy and repeatability.

The LM4040D50ILP is a micropower bandgap reference (BBGR) with a voltage output of +50 mV. It consumes 250 μA of current and operates from a supply voltage range of 4.5V to 36V. The voltage reference is available in an SOT23 surface-mount package for easy integration for volume applications. The operating temperature range of this device goes from -60°C to +125°C.

The LM4040D50ILP is designed for low noise and excellent long-term stability. Its voltage accuracy is better than 0.5% at rated conditions over the entire temperature range, making it suitable for a variety of shunt reference and precision current sense applications. The LM4040D50ILP is particularly ideal for the charging and monitoring of Li-ion and Li-polymer batteries up to 36V. The low output resistance (2Ω max) of this device puts it apart from the competitors, providing quick response time that meets fast transient requirements.

The working principle of the LM4040D50ILP is based on an innovative bandgap reference design. The bandgap reference is an electronic circuit that produces a reference voltage with minimal fluctuation over a wide temperature and current range. This is achieved through the use of two diodes connected in series, forming a voltage divider circuit. This divider circuit is used to produce a stable reference voltage, regardless of temperature and supply line voltage changes. Compared to conventional IC voltage references, bandgap designs are able to maintain characteristics with excellent temperature compensation and minimal temperature variation.

The LM4040D50ILP is designed to operate over a wide voltage range and temperature range, to achieve more precise reference voltages than standard designs. This makes it suitable for battery monitoring, as it can operate in low temperature, high temperature and even extreme temperature conditions without impacting performance. Additionally, the LM4040D50ILP offers excellent noise immunity, making it a superior choice for applications that require clean and smooth signals such as automotive power supplies.

In summary, the LM4040D50ILP is a highly reliable voltage reference ideal for shunt reference and precision current sense applications. It is a versatile micropower bandgap reference, with a wide operating temperature range of -60°C to +125°C and a rated voltage accuracy of better than 0.5%. The LM4040D50ILP provides low output resistance, excellent line and load regulation performance as well as excellent noise immunity. It is particularly suitable for use in Li-ion and Li-polymer battery charging and monitoring applications.

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