LT1109ACS8#PBF

LT1109ACS8#PBF Application Field and Working Principle

LT1109ACS8#PBF is a monolithic, single chip integrated circuit (IC) Switching Regulator, which is mainly used for voltage regulators, power management, and power conversion. It is produced by Linear Technology.

The LT1109ACS8#PBF is a DC to DC switching regulator that features a 2-Amp output current capable of driving up to 12-V from 5-V input voltage. This IC is suitable for both fixed and adjustable output voltage applications. In addition, up to 5 sequential regulators can be cascaded to increase the output voltage.

The LT1109ACS8#PBF has three operating odes: forced PWM, phase-lock loop (PLL), and phase-lock loop with frequency dithering (PFM). The PWM mode is used when it is more important to reduce output ripple than to reduce power dissipation. The PLL mode is used when excellent line and load regulation is required. The PFM mode offers both improved line and load regulation over PWM mode, along with improved power dissipation.

The LT1109ACS8#PBF draws a nominal of 3-mA quiescent current from the output capacitor, which makes it an excellent choice for portable applications. In addition, this regulator features a low noise, low ripple output and can handle inrush currents up to 20-A. It has a shutdown option and an undervoltage lockout (UVLO) circuit as well.

The LT1109ACS8#PBF is commonly used in a wide range of applications, including satellite communication systems, DC motor control, uninterruptible power supplies, medical equipment, automotive systems, industrial digital control systems, battery-powered systems, and embedded systems.

The working principle of the LT1109ACS8#PBF is simple. When the input voltage rises above the undervoltage lockout level (UVLO), the IC\'s error amplifier regulates the circuit\'s output voltage. The error amplifier regulates the switch\'s oscillation frequency and thus the output voltage. The IC charges a network of external capacitors by switching on the internal power switch. The error amplifier then senses the output voltage level and turns off the internal power switch when the output voltage reaches the desired value.

In summary, the LT1109ACS8#PBF is a monolithic, single-chip DC to DC switching regulator and is suitable for both fixed and adjustable output voltage applications. It is suitable for a wide range of applications, including satellite communication systems, DC motor control, uninterruptible power supplies, medical equipment, automotive systems, industrial digital control systems, battery-powered systems, and embedded systems. The working principle of the LT1109ACS8#PBF is based on an error amplifier that regulates the circuit\'s output voltage using the internal power switch and a network of external capacitors.