L4989MD

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Linear voltage regulators are widely used in the field of power management, their purpose is to maintain a constant output voltage on the load regardless of the input voltage or load current variations. The L4989MD is a specific member of the Linear voltage regulators family. In this article, we will explain the application of this device as well as its working principle.

The L4989MD is a symmetrical step-down current mode Pulse Width Modulation (PWM) voltage regulator that combines high precision, with very high efficiency. This device, which is cost-effective, offers wide input voltage range (up to 42 V, with no heatsink necessary), which makes it perfect for automotive, industrial and consumer applications.

Regarding the features of the L4989MD, it has high efficiency of up to 90%, very small switching noise, low operating temperature, fast transient response and low thermal effects. This voltage regulator offers adjustable fixed voltage outputs and up to 1.2A current. In terms of safety, it ensures over-temperature protection, over-voltage protection and short-circuit protection.

The L4989MD is very easy to use because it only needs some basic components to work properly. It is conformal coated and its pins connection is very simple. It has a side adjustable mode, where the output voltage can be adjusted through the voltage divider R3-R4, so it can be used with a wide range of input voltages.

Regarding its internal architecture, the L4989MD consists of two internal components, a Buck Switch and an Error Amplifier (EA). The Buck Switch controls the output voltage according to the input voltage, so that the output voltage is equal to the internal reference voltage (Vref). This makes the output voltage stable regardless of the changes in input voltage or load current. The Error Amplifier is responsible for monitoring the voltage changes of the output and providing feedback to the Buck Switch, so that it can adjust the current to maintain the output voltage stable by changing the Pulse Width Modulated (PWM) signal.

In summary, the L4989MD is a cost-effective, high-precision current mode PWM-controlled voltage regulator, ideal for automotive, industrial and consumer applications. It can operate with input voltages up to 42V and offers adjustable fixed voltage outputs and up to 1.2 amps of current output. The internal architecture of this device includes both a Buck Switch and an Error Amplifier, which are responsible for controlling the output voltage in order to keep it stable, no matter the changes in the input voltage or load current.

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