LD29150PT18R

LD29150PT18R Application Field and Working Principle

LD29150PT18R is a voltage regulator of the LD2915 family from Diodes Incorporated. This device is in the Voltage Regulators - Linear category for Power Management and Integrated Circuits (PMIC). LD29150PT18R is a linear regulator controller that reduces the voltage output from a higher voltage input, so as to provide a stable voltage output with a low quiescent current. It regulates the current flow not just by sensing the voltage, but also by sensing the current, making the output voltage independent of the load current.

Features

• Ultra Low Quiescent Current: 25uA maximum
• Adjustable Voltage Output: 0.8V to 17V
• Precise Line and Load Regulation
• Precise Dropout Voltage
• Low Noise Output: 7mVrms
• Low Dropout Voltage: 4mV

Applications

• Battery-Powered Applications
• Computer & Peripheral Supplies
• Cellular Phones & PDAs
• Data Acquisition Systems

Working Principle

The working principle behind the LD29150PT18R voltage regulator is to regulate the input voltage by using two sensing impedances.The two sensing impedances sense both the voltage and current of the input voltage. This allows the regulator to be able to reduce the output voltage to a more effective and stable voltage. Also, this type of voltage regulator works well under extreme temperature conditions and can provide an output voltage with a low quiescent current.

The primary sensing impedance of the LD29150PT18R voltage regulator is a resistor, R1. This resistor is connected between the input voltage and the output voltage. This resistor is responsible for the initial voltage regulation of the input voltage. The output voltage is adjusted through the ld29150PT18R voltage regulator, which pulls down the output voltage and maintaining the output voltage at a steady level. This brings the load current down closer to the maximum current flow capabilities of the load.

The second sensing impedance is a current sense resistor, R2. This resistor is connected in series with the input voltage to further monitor the input voltage. This ensures that any excessive current is sensed and can be corrected. It also allows the voltage regulator to make fine adjustments to the output voltage if needed.

The LD29150PT18R voltage regulator is able to provide maximum current protection for the load and provide an accurate output voltage. The output voltage is determined by the voltage sense resistor, R1 and the current sense resistor, R2. As the voltage drops, the current sense resistor senses the increase in input voltage and increases the output voltage accordingly. The output voltage is then regulated by the voltage regulator. The voltage regulator will keep the output voltage constant regardless of the load current.

Conclusion

LD29150PT18R from Diodes Incorporated is an efficient voltage regulator that offers an ultra low quiescent current. Its regulator controller helps reduce the voltage output from a higher voltage input, so as to provide a stable voltage output. The voltage regulator operates through two sensing impedances, a voltage sense resistor and a current sense resistor, and is capable of providing a precise line and load regulation, as well as a low noise and dropout voltage. LD29150PT18R is suitable for various types of applications, such as battery-powered, computer and peripheral supplies, cellular phones and PDAs, and data acquisition systems.