L7906CV

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The L7906CV is a 3-terminal negative voltage linear regulator from STMicroelectronics. It features adjustable output voltage, wide input voltage range, low quiescent current, ultra low-dropout voltage, thermal protection, and fast transient response. It is a device used for providing a stable and low output voltage, in applications that require voltage regulation with limited available space.

Applications of L7906CV Voltage Regulator

The L7906CV is a compact and efficient linear voltage regulator commonly used in portable electronic devices and industrial equipment. It is suitable for applications that require low noise and low output voltage such as mobile phones and portable electronic communication devices, automotive electronics, computer networks, household appliances, electrical tools, and medical instruments. This device can also be used in power management and converters, switching regulators, line-powered systems, and voltage reference circuits.

Working Principle of L7906CV Voltage Regulator

The L7906CV has an adjustable negative voltage output from -1.5V to -25V with an operating current up to 150mA. It features a constant-current current-limit protection and thermal protection against short-circuited outputs, providing added protection for the device and the load. The thermal protection feature will shut the device off if it exceeds a certain temperature, preventing damage due to overheating. The device also has a low quiescent current, which reduces energy consumption and helps extend the battery life of portable electronic devices.

The L7906CV voltage regulator is based on a linear pass transistor. It uses three internal transistors to generate the output voltage, a constant current source (CCS), and two resistors, with one resistor connected in series with the CCS and another resistor connected in series with the pass transistor. The internal reference voltage is connected to the CCS, and the pass transistor and two resistors are connected to the output voltage divider. The reference voltage is then compared to the voltage at the output of the voltage divider. If the output voltage is lower than the reference voltage, the pass transistor is turned on and the current from the CCS is drawn through the two resistors, increasing the output voltage. If the output voltage is higher than the reference voltage, the pass transistor is turned off and the current from the CCS is diverted away from the two resistors, reducing the output voltage.

The L7906CV voltage regulator has good input and output noise rejection, making it suitable for noise-sensitive applications. It is compact, stable, and reliable, making it ideal for space-restricted and long-term operation. This device also supports large-capacitor discharge and charges, providing loud audio output in pulsed current applications.

The L7906CV voltage regulator is a reliable and efficient linear voltage regulator suitable for low output voltage and noise-sensitive applications. It has good input and output noise rejection, a wide input voltage range, low quiescent current, and fast transient response, providing a stable and low output voltage with limited available space.

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