LT3083IT#40PBF

PMIC - Voltage Regulators - Linear

The LT3083IT#40PBF is a high-performance, low-dropout linear regulator that features adjustable current limit, short-circuit protection and low ripple. It is a three-pin adjustable positive voltage regulator in tiny SOT-23 package, making it ideal for applications that require a low dropout linear regulator with low voltage requirements.

Application Fields

The LT3083IT#40PBF is suitable for a wide range of applications, including:

• DSL modem: The LT3083IT#40PBF is capable of supplying up to 1.25A current output and has a wide input voltage range of 4.5 to 40V, suitable for DSL modems that require low noise output.
• Communications: The LT3083IT#40PBF is ideal for applications such as multiplexers, IP cameras and other communications devices due to its high Ripple rejection and low maximum output noise.
• Computer peripherals: The LT3083IT#40PBF can supply up to 1.25A current output, making it suitable for powering computer peripherals such as hard drives, and memory cards.

The LT3083IT#40PBF is also suitable for other general applications where a low voltage regulator with low dropout is needed.

Working Principle

The LT3083IT#40PBF is an adjustable low dropout linear regulator that works on the principle of a ‘direct connect’ output stage, providing a high output current with a low dropout voltage. The device incorporates an on-chip current limit and thermal shutdown, which provide protection from output overloads and thermal overloads.

The LT3083IT#40PBF uses an N-channel MOSFET as the pass element at the output, providing a minimum dropout voltage of 250mV. The Schottky diode at the input of the regulator ensures a minimum dropout voltage of 1.2V. The internal voltage reference of the device sets the output voltage, while an internal error amplifier compares the output voltage to the reference and regulates the input current to maintain the desired output.

The LT3083IT#40PBF also features an adjustable current limit, which limits the current that passes through the device. This prevents the device from being overloaded, protecting the device and connected components from damage.

The LT3083IT#40PBF also features short circuit protection, which prevents the device from supplying current if the output is shorted. The device will automatically reset when the short is removed.

The LT3083IT#40PBF is designed for use in applications that require low noise and low ripple, such as DSL modem, multiplexers and IP cameras. The device’s high-frequency ripple rejection ensures that the output remains noise free. The device also features low ripple, so the output voltage remains stable across a wide load range.

Conclusion

The LT3083IT#40PBF is a high-performance, low-dropout linear regulator that features adjustable current limit, short-circuit protection and low ripple. It is suitable for a wide range of applications, such as DSL modem, multiplexers, IP cameras and computer peripherals that require a low dropout regulator. The device’s high-frequency ripple rejection and low-ripple output ensure a noise-free and stable output voltage.