LM117H/NOPB

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Power management ICs (PMICs) are integrated circuits designed to manage and control the power in electronic devices. They are used in a variety of applications, from personal computers and mobile devices to security systems, server farms, and aerospace systems. PMICs handle the supply of power to other components, as well as the conversion, regulation, and distribution of power. The LM117H/NOPB is an adjustable linear voltage regulator that belongs to the line of PMICs.

Application Field

The LM117H/NOPB provides three-terminal adjustable output voltage ranging from 1.2 V to 37 V. Due to its highly programmable output voltage, this PMIC is largely used in industrial, military, and commercial off-the-shelf (COTS) applications such as data acquisition, telecommunication, and embedded systems as well as LCDs and OLEDs displays.

Working Principle

The LM117H/NOPB uses a reference voltage, a current-regulated operational amplifier, and a linear power transistor to regulate an output voltage. A resistive voltage divider can be used to adjust the output voltage. When the adjustable voltage deviates from the reference voltage, a control signal is sent to the operational amplifier. This amplifies the difference between the two voltages, creates a current proportional to the detected voltage difference, and modulates the output signal of the power transistor accordingly. The current flows through the power transistor and causes a voltage drop across its collector-emitter terminals, which in turn compensates for the voltage variation. This process helps to regulate the output voltage to meet the required levels.

Design Features

The LM117H/NOPB is rated for an output current of 100 mA and is designed for supply voltages ranging from 3 V to 40 V. This PMIC supports temperature ranges between –40°C to +125°C and isolation voltages up to 1,500 Vrms. In addition, features such as SOIC-8 package, current-limited protection, short-circuit protection, low supply current, and high output voltage accuracy make this device an ideal choice for a variety of applications.

Conclusion

The LM117H/NOPB adjustable linear voltage regulator is a highly programmable and efficient PMIC used in a wide range of industrial, military, and COTS applications. It features low supply current, short-circuit protection, current-limited protection, and high output voltage accuracy for improved performance and efficiency. This device can be used in LCDs and OLEDs displays, data acquisition systems, telecommunication systems, and embedded systems. Thus, it is well suited to a variety of power management applications.

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