LT1129IQ#PBF

PMIC - Voltage Regulators - Linear

The LT1129IQ#PBF is a linear voltage regulator specifically designed to provide precise regulated output voltage with a minimum voltage drop across the regulator. It features ultra-low quiescent current and low operating current, making it well-suited for applications with strict energy requirements. In addition, the LT1129IQ#PBF is capable of delivering up to 300mA of load current and has an adjustable output voltage from 0.8V to 25V.

Applications

The LT1129IQ#PBF is suitable for a variety of applications, including power sequencing, automotive systems, handheld devices, networking, medical systems, communication systems, and consumer electronics. It is suitable for supplying current for RF amplifiers, crystal oscillators, voltage converters, and other circuits that require precise voltage regulation.

Working Principle

The LT1129IQ#PBF utilizes a linear regulator architecture, which consists of an operational amplifier, error amplifier, comparator, power transistor, and linear pass devices. This architecture is often referred to as an "error amplifier" style regulator. The error amplifier compares the output voltage to the reference voltage and then amplifies the difference. The amplified voltage is compared to the voltage divider, and the power transistor is switched on and off to control the flow of current through the pass device.

The LT1129IQ#PBF also features a feedback loop to ensure a stable output voltage. The feedback loop works by monitoring the output of the error amplifier and making adjustments to the reference voltage to ensure that the output voltage remains constant. This feedback loop helps to ensure that the output voltage remains stable, even in the presence of external noise or other fluctuations.

The LT1129IQ#PBF is also designed to minimize power dissipation while providing a high level of power-supply regulation. It features a low-dropout voltage and a wide range of input-supply ramp rates to minimize power dissipation. In addition, it is capable of operating from a wide range of input voltages, from 4V to 40V.

Conclusion

The LT1129IQ#PBF is a linear voltage regulator specifically designed for applications requiring precise regulation, ultra-low quiescent current and low operating current. It is suitable for a variety of applications, including power sequencing, automotive systems, handheld devices, networking, medical systems, communication systems, and consumer electronics. It features a range of input voltages, adjustable output voltages, and feedback loop for stability, making it a versatile and power-efficient voltage regulator.