LM140LAH-12

The LM140LAH-12 is a monolithic integrated voltage regulator from Texas Instruments, specifically designed for applications requiring a minimum of external components. It is one of the linear voltage regulator series, which means that it operates on the principle of controlling the output voltage by using a series regulator. As a voltage regulator, the LM140LAH-12 is used to maintain a steady output voltage in spite of fluctuations in the supply voltage or load current.

The LM140LAH-12 offers a low voltage dropout of 0.6V, a low quiescent current of only 19mA, wide operating temperature range of -40°C to +125°C, and is adjustable from 1.25V to 40V. The output voltage is programmable via a ...read more

The LM140LAH-12 utilizes a series type control arrangement to regulate the output voltage. A simple series regulator consists of a transistor and a voltage source, usually a Zener diode or a resistor. The input voltage is applied to the base of the transistor, which acts like a switch to regulate the flow of current into the output. By controlling the base voltage, the transistor can be made to switch faster or slower, which causes the output voltage to rise or fall. The output voltage is determined by the Zener voltage or the resistance of the series resistor.

The LM140LAH-12 utilizes a three-terminal regulator, with four additional pins for connecting external components. The input voltage is applied to one terminal, while the output voltage is provided at the other two terminals. The other two external pins are used to enable/disable the regulator and to adjust the maximum output current. The LM140LAH-12 also includes protection against short circuits and overloads, as well as a thermal shutdown.

The LM140LAH-12 is an ideal solution for applications such as local, on-board regulators, battery chargers and systems with variable input voltage. It provides reliable and accurate voltage regulation with minimal external components, and is widely used in laptop computers, cellular phones and other portable electronics.

In conclusion, the LM140LAH-12 is a voltage regulator from Texas Instruments designed for applications requiring minimal external components. It is a linear voltage regulator, which operates on the principle of controlling the output voltage using a series regulator. The device features a low voltage dropout, low quiescent current, wide operating temperature range and adjustable output voltage. It is also protected against short circuits and overloads, making it an excellent choice for applications such as on-board regulators, battery chargers and systems with variable input voltage.