STMicroelectronics

LF90CDT  

Linear & Switching Voltage Regulators

LF90CDT Description

The LF90CDT is a linear voltage regulator designed by STMicroelectronics, offering a fixed output voltage of 9V and a maximum output current of 500mA. This regulator is housed in a DPAK package, making it suitable for surface-mount applications. Despite being marked as obsolete, the LF90CDT remains a reliable choice for applications requiring a stable power supply with a low dropout voltage of 0.7V at 500mA. The regulator features a maximum input voltage of 16V and a supply current of up to 12mA. With a quiescent current of 1.5mA, the LF90CDT ensures efficient power usage, making it ideal for applications where power consumption is a critical factor.

LF90CDT Features

• Fixed Output Voltage: The LF90CDT provides a stable 9V output, ensuring consistent power supply to connected devices.
• High Efficiency: With a dropout voltage of 0.7V at 500mA, the regulator maintains high efficiency even at lower input voltages.
• Low Quiescent Current: The 1.5mA quiescent current ensures minimal power consumption during operation, making it suitable for battery-powered devices.
• Protection Features: The regulator includes over-current and over-temperature protection, safeguarding both the device and connected components from potential damage.
• High PSRR: The LF90CDT offers a power supply rejection ratio (PSRR) ranging from 71dB to 56dB across frequencies from 120Hz to 10kHz, ensuring clean and stable output voltage.
• Compliance: The regulator is REACH unaffected and RoHS3 compliant, meeting environmental and safety standards.
• Moisture Sensitivity Level: With an MSL of 1 (Unlimited), the LF90CDT is suitable for various environmental conditions without the need for special handling.

LF90CDT Applications

The LF90CDT is ideal for a variety of applications where a stable and efficient power supply is essential. Its low dropout voltage and high PSRR make it suitable for:

• Consumer Electronics: Providing stable power to devices such as portable audio equipment, where low power consumption and high efficiency are crucial.
• Industrial Equipment: Ensuring reliable power supply in industrial applications where consistent voltage is required for optimal performance.
• Battery-Powered Devices: The low quiescent current and high efficiency make the LF90CDT a suitable choice for devices that rely on battery power, extending operational time.
• Automotive Applications: The regulator's robustness and protection features make it suitable for automotive electronics, where reliability and safety are paramount.

Conclusion of LF90CDT

The LF90CDT, despite being marked as obsolete, remains a robust and reliable linear voltage regulator. Its unique features, such as low dropout voltage, high PSRR, and low quiescent current, make it an attractive choice for applications requiring stable and efficient power supply. The inclusion of over-current and over-temperature protection ensures the longevity and safety of both the regulator and connected devices. While newer models may offer additional features, the LF90CDT's proven performance and compliance with industry standards make it a dependable option for a wide range of applications.

LF90CDT Documents

Download datasheets and manufacturer documentation for LF90CDT