LT1129CST-5#PBF

PMIC: Voltage Regulators: Linear

The LT1129CST-5#PFB is a high-performance voltage regulator ideal for applications ranging from plus/minus 4.5V to 15V, with a low quiescent current of 8mA and excellent thermal stability. It is a feature-rich device that consists of a high-precision reference, a current source, and a low-noise error amplifier. The IC can deliver up to 200mA of load current and provides a regulated voltage of either +5V or -5V.

Functionality

The LT1129CST-5#PFB operates in a single-supply configuration from a +4.5V to -15V supply. The IC is protected from short-circuit, over-voltage, and over-temperature situations, and also features a power-saving shutdown mode and a variable output voltage range. It also boasts of extremely low output noise thanks to its low-dropout voltage.

Parameters

The LT1129CST-5#PFB operates at a power supply of ±15V to ±5V and has an adjustable output voltage range of -1V to +10V. The device has an operating temperature range of -65°C to +150°C and dissipates a maximum power of 0.5W. The IC also features an ultra-low dropout voltage of 100mV and has a quiescent current of 8mA.

Working Principle

The LT1129CST-5#P FB is a three-terminal device that provides a regulated, low-noise output voltage. The IC\'s high-precision reference and current source, together with its low-noise error amplifier, enable it to achieve the desired output voltage set point. The IC draws a quiescent current of 8mA that increases the current source and increases the voltage of the error amplifier\'s output. This increases the voltage-comparison error, and thus the current to the series pass transistor. The pass transistor regulates the current, allowing the output to reach its steady-state voltage. The output voltage is then regulated by the error amplifier, which has low impedance and good thermal stability.

Uses and Benefits

The LT1129CST-5#PFB is ideal for voltage-regulation applications that require low quiescent current and high stability. It is suitable for audio signal processing, mobile communication equipment, personal digital assistants, touch-panel displays, and many other applications that require low-noise, low-dropout regulation. The device\'s low-dropout design allows it to provide high accuracy and stability even in low-voltage conditions, making it an ideal choice for applications that require high precision.