LM4040D30IDBZTG4

The LM4040D30IDBZTG4 is a precision Micropower Shunt Voltage Reference, a type of PMIC - Voltage Reference, with small size and low power consumption. This low dropout voltage reference provides a stable output with an accuracy of ±0.6% irrespective of input voltage variations and temperature fluctuations. This device comes in an SOT-23 package and is fully specified for operation over the temperature range of -40°C to +125°C.

The LM4040D30IDBZTG4 provides a low output impedance, less than 11Ω max, making it highly suitable for use in current sensing and voltage buffering applications. It also requires a low quiescent current of only 270nA. The output voltage offered is 3.0V,2.5V, and 1.8V.

Applications

• Cordless & Mobile Phones
• Small handheld devices
• Portable instrumentation equipment
• Computer peripherals

Working Principle

The LM4040D30IDBZTG4 operates in a manner known as \'voltage holding\'. In this mode, the output voltage (Vout) is formed by the application of a reverse-biasing voltage, Vref across a semi-conductor junction. A resistor divider circuit is used to provide the necessary biasing voltage. The output voltage is proportional to the resistor divider ratio, Vout = Vref × (R1/R2). The LM4040D30IDBZTG4 features a high input impedance, low dropout voltage, and low bias current making it suited for current sensing and regulation of small signal supply (2.5V) in consumer electronics.

The low input and output impedances of LM4040D30IDBZTG4 and low power consumption design ensures the device does not interfere with the signal path, thereby improving the sensor’s signal-to-noise ratio, and in turn providing robust performance without degrading the signal. The device is also very reliable due to its careful selection of electronic components, like PTC Electrostatic Discharge (ESD) protection and special packaging that ensures the device meets its highest performance ratings.

The LM4040D30IDBZTG4 Micropower Shunt Voltage Reference also features an integrated bandgap circuit, which improves the stability of the output voltage over temperature and load conditions. With its low power consumption, good accuracy, and wide operational temperature range, the LM4040D30IDBZTG4 is the perfect choice for applications such as current sensing, voltage buffering, and portable instrumentation.