LX1553CM Datasheet/PDFThe LX1553CM is a high precision, fast response integrated circuit (IC) designed for use in voltage regulator and other power management applications. It integrates a high-accuracy voltage feedback device, an active current-limited operating mode, and a wide feedback voltage temperature coefficient range. As a result, it is particularly suited to applications in automotive, industrial, and telecommunications systems where high accuracy, low power dissipation, and/or high speed control is required.
The LX1553CM is a DC-DC switching controller that is intended for use as an inexpensive, low power, and well-controlled voltage regulators, responsible for controlling the input and output voltages in DC-DC buck step-down converters. It is a flexible choice for any application that requires another voltage source that is smaller or larger than the primary one.
The LX1553CM makes use of a Pulse Width Modulation (PWM) technique to control the switching of a power MOSFET, allowing it to step-down or step-up the specified supply voltage. The PWM is used to convert the available DC voltage into a lower voltage and is the key feature of the LX1553CM. This IC allows current to flow through the MOSFET only when its pulse width is active. By controlling the width of the pulses, the user can select a voltage output from the device.
The PWM signal incorporates several variables, including threshold voltage, a power feedback loop for load operation, frequency modulation for noise reduction, temperature compensation and a ramp generator for soft-start and voltage sequencing. By using the integrated power feedback loop for the load, the voltage output is accurately regulated even when the supply voltage is varying, or the load is changing.
The LX1553CM also ensures stability and protection from over-current and over-temperature conditions. It is also equipped with frequency modulations (FM) capability, which provides excellent noise reduction under various environmental conditions. Additionally, the integrated temperature compensation function increases the accuracy of voltage regulation while reducing the power dissipation.
In conclusion, the LX1553CM is an excellent choice for a wide range of applications where precise voltage regulation and power management is needed. It provides a variable voltage output, integrated temperature compensation, a current-limited operating mode, frequency modulation for noise reduction, and excellent power feedback regulation. As a result, it is ideal for use in automotive, industrial, and telecommunications systems.