LM3940IMPX-3.3/NOPB Integrated Circuits (ICs)

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The LM3940IMPX-3.3/NOPB is a three terminal low dropout (LDO) voltage regulator and is part of a range of linear voltage regulators developed by Texas Instruments (TI). The LM3940IMPX-3.3/NOPB is used to regulate the output Voltage from a power supply or battery, and can be used in a variety of applications, from automotive and industrial to consumer electronics.

Application Field

The LM3940IMPX-3.3/NOPB is designed to provide a regulated 3.3V output voltage and up to 1A of assist current with an input voltage range of 3V to 30V, making the regulator suitable for driving a wide range of low and medium power loads. This device is especially well-suited for automotive and industrial applications where input voltage and output voltage variations occur and stable output voltage is essential for the continuous performance of the application and its reliability. Additionally, the LM3940IMPX-3.3/NOPB can be also used in consumer electronics applications, such as cellular phones and digital cameras, where its low quiescent current and low voltage dropout combine to reduce system power consumption.

The device’s thermal characteristics and its large operating temperature range ( – 40 °C to 125 °C ) ensures that it can be used in a variety of challenging applications. Its robust design is further enhanced by its reverse-battery and current-limited shut-down protection features which safeguard the device against possible damage.

Working Principle

The LM3940IMPX-3.3/NOPB is a three terminal low dropout (LDO) voltage regulator designed to provide a regulated 3.3V output voltage with a wide input voltage range of 3V to 30V. The device uses a PNP pass transistor, with a reference voltage of 1.235V, to control the output voltage. The reference voltage is generated by a bandgap circuit, which is stabilized by two external capacitors connected to its inputs. The base current for the PNP pass transistor is provided by an error amplifier, which monitors the output voltage using a voltage divider to compare it to the reference voltage.

Once the output voltage is close to the desired value, the error amplifier reduces its base current to the pass transistor and the output voltage stabilizes. If the load current increases or the input voltage changes, the error amplifier will adjust its base current in order to maintain the output voltage at the desired level. The output voltage can also be controlled via an external divider, allowing fine tuning of the voltage.

The LM3940IMPX-3.3/NOPB also incorporates protection features such as reverse-battery and current-limited shut-down which safeguard the device against possible damage. In addition, it incorporates thermal shutdown and soft start circuitry which allow it to operate over wide temperature and load variations.

In summary, the LM3940IMPX-3.3/NOPB is a three terminal low dropout voltage regulator designed to provide a regulated 3.3V output voltage with a wide input voltage range of 3V to 30V. It is ideally suited for automotive and industrial applications where input voltage and output voltage variations occur and stable output voltage is essential for the continuous performance of the application and its reliability. The device also offers protection features, such as reverse-battery and current-limited shut-down, which safeguard it against possible damage. Its thermal characteristics and wide operating temperature range also allows it to be used in a variety of challenging applications.

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