LT1129IQ-3.3#PBF

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The LT1129IQ-3.3#PBF is a versatile, precision low dropout (LDO) regulator. It is one of many products in Linear Technology\'s portfolio of voltage regulators. It is particularly useful as a precision power supply for applications requiring low noise or low output voltage ripple. The LT1129IQ-3.3#PBF is ideal for applications such as mobile phones, notebook computers, medical electronics, gaming systems, and other battery-powered products requiring ultra-low power consumption and high efficiency.

The LT1129IQ-3.3#PBF was designed to provide a fixed 3.3 V output with a wide input voltage range of 2.5 V to 5.5 V. It offers high efficiency performance and lowest dropout voltage from 0.3 V at 400 mA to 0.5 V at 1000 mA. It also features low temperature coefficient, low input and output noise, wide output voltage range, high output voltage accuracy and fast transient response.

The LT1129IQ-3.3#PBF features an internal compensation for fast loop response for tight load/line regulation. It has shutdown and remote sensing capability, allowing the user to set the output voltage from the external source. This makes it well-suited for applications where the output voltage needs to be adjusted remotely.

The LT1129IQ-3.3#PBF is designed to be very small and cost-effective, requiring minimal external components and featuring a slim 4 mm × 4 mm package. The LT1129IQ-3.3#PBF has an output-to-input voltage difference (dropout voltage) as low as 0.3 V at 400 mA and 0.5 V at 1000 mA.

Working Principle

The LT1129IQ-3.3#PBF regulators operate according to the switched capacitor principle. When a voltage drop occurs on the linear output, the internal switch will turn on and charge the external capacitor until the output voltage reaches the set voltage. This way the output voltage is kept constant despite varying load and input voltage. The LT1129IQ-3.3#PBF is internally compensated and uses feedback to adjust the output voltage.

The LT1129IQ-3.3#PBF is also designed to minimize power consumption. It features low quiescent current to minimize power consumption in low power applications. It also features a shutdown mode to maximize battery life. The LT1129IQ-3.3#PBF also features thermal protection to protect itself from overheating and extends its life span.

Application Fields

The LT1129IQ-3.3#PBF is suitable for a wide variety of precision power supply applications. These include sensing, portable and handset applications, as well as other battery-powered and low power products. It is used for high current applications such as notebook computers, gaming systems, or other products requiring ultra-low power consumption and high efficiency. It is also prominently used in medical electronics, such as medical instrumentation, medical implants, and medical imaging.

The LT1129IQ-3.3#PBF is also suitable for use in a wide range of automotive applications, including automotive infotainment, autonomous driving, battery management, and other automotive power systems. It is also suitable for industrial applications ranging from industrial process control to distributed power systems. The LT1129IQ-3.3#PBF is also used in a variety of other applications, ranging from robotics to home automation.

Conclusion

The LT1129IQ-3.3#PBF is a versatile, precision low dropout (LDO) regulator from Linear Technology. Its wide input voltage range of 2.5 V to 5.5 V and output voltage range of 0.3 V to 3.3 V make it suitable for a wide variety of applications. Its low dropout voltage, low temperature coefficient, low input and output noise, and fast transient response make it an excellent choice for precision power supply applications that require low noise or low output voltage ripple. Its small size and cost-efficient design make it suitable for mobile phones, notebook computers, medical electronics, gaming systems, and other battery-powered products.

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