LMR14020SDDAR

LMR14020SDDAR Application Field and Working Principle

The LMR14020SDDAR Step-Down DC-DC Converter is a member of Texas Instruments’ high-efficiency, low-cost family of integrated step-down voltage regulators. It requires only a few external passive components and operates at up to 6 MHz, allowing the use of small inductor and capacitor sizes when compared with other low-cost solutions, hence providing a space-saving and cost-effective switching voltage regulator solution. This integrated DC-DC converter can be readily incorporated into a wide range of applications from power system monitoring to power management in automotive designs.

Application Field

The LMR14020SDDAR is available in the 4-pin SOT-23 package, which has a peak efficiency up to 93%. The input voltage range is 4.5V to 40V, and the output voltage tolerance is ±0.5%. With a wide input voltage range, the LMR14020SDDAR is suitable for automotive and industrial applications. It also works in other fields such as automobiles, connectors, backup batteries, medical supplies in cold chain packages, power system monitoring, and portable devices.

The LMR14020SDDAR can be used to power µP-based industrial, automotive and portable systems. The 4-pin industry standard SOT-23 package makes it easy to incorporate the LMR14020SDDAR into additional wider system applications. These applications also make use of its wide input voltage range, which can reduce the overall number of discrete power supplies needed in an application. Furthermore, its high efficiency and low output ripple ensures that the overall power supply takes up a minimum of board space.

Working Principle

The LMR14020SDDAR is a monolithic switching voltage regulator that combines variable frequency control, pulse-width modulation (PWM) and current mode control. The LMR14020SDDAR utilizes a forward converter circuit topology and operates with a fixed switching frequency of up to 6 MHz to generate an output voltage that is adjustable from 0.8V to the input voltage. It requires only a few external passive components including a ceramic output capacitor, a inductor and a Schottky diode.

The current mode control provides faster dynamic response than voltage-mode control and enables constant frequency operation, providing a more precise output voltage regulation under varying line conditions and load levels. The LMR14020SDDAR also has cycle-by-cycle current limit that provides excellent overload protection. It also features high operating efficiency due to minimal conduction loss in the external components.

In summary, the LMR14020SDDAR is a versatile, high-efficiency, low-cost DC-DC converter module with a wide input voltage range and adjustable output voltage. It can be readily incorporated into a wide variety of applications in power system monitoring to power management in automotive designs. Furthermore, its high efficiency, low output ripple and cycle-by-cycle current limit provide reliable protection even during overload conditions.