LM317MADTRK

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The LM317MADTRK is an advanced voltage regulator specifically designed for use in Microprocessor (µP) and digital signal processor (DSP) based applications. The device is capable of selecting operating voltages from 0.6V to 4.2V with a wide output voltage range from 2.5V to 40V and a high accuracy of 0.1% over the full temperature range. It also has a programmable shutdown threshold and enables output voltage sequencing.

The LM317MADTRK is a voltage regulator designed for use in a wide range of applications, including automotive, communication, medical, solar energy, and industrial, as well as high performance power supplies. It is especially suitable for applications requiring high accuracy and low output noise. The device combines low on resistance, fast settling time, and high input/output headroom to deliver superior regulator performance.

Application Field

The LM317MADTRK is a highly featured voltage regulator ideal for automotive and industrial applications. Its combination of high accuracy and low output noise make it ideal for a wide range of applications, including power converters and PoE (Power over Ethernet) systems. In addition, the device can be used in DSP- and µP-based systems such as digital cameras, robotic systems, medical devices, and avionics systems, where a regulator must perform with high efficiency and low noise over a wide voltage range.

The device has a wide operating range from 0.6V to 4.2V and a wide output voltage range from 2.5V to 40V. This makes it ideal for powering low voltage embedded systems consuming up to 10 watts of power. The ultra-low voltage level flexibility also makes it well suited for powering digital logic operation and a variety of other digital logic devices.

The LM317MADTRK is capable of sequencing up to 8 output voltages with up to 8 different sequences. This feature is useful in applications where a predetermined output voltage is required to power multiple different systems. It can also be used in applications where multiple output voltage sequencing is required.

Working Principle

The LM317MADTRK features a N-channel MOSFET that connects the output voltage to the input voltage. The device utilizes a constant-voltage/constant-current feedback loop to set the output voltage to its predetermined value. Under voltage conditions, an external circuit connected to the error amplifier input of the device is used to regulate the output voltage. The regulator ensures that the maximum output voltage does not exceed the programmed value by controlling the output current. The output voltage is sensed at the drain of the MOSFET and is compared with an internal reference voltage. When the output voltage is higher than the reference, the error amplifier output is pulled low, thus terminating the output current and setting the output voltage to the correct level.

The default output voltage of the LM317MADTRK can be programmed using an external resistor and capacitor combination. The external components are used to establish the desired voltage level. The output voltage can be further adjusted using the ADJ pin to fine tune the voltage to the desired level. The device also features an output enable (EN) pin, which can be used to turn off the output voltage. This feature is useful for applications where the device needs to be disabled for a short period of time, such as for system reset or to prevent high inrush current conditions.

The LM317MADTRK is extremely reliable in operation and features built-in safety features such as over-temperature, over-voltage, and short circuit protection. Its built-in thermal limiter ensures that the device remains safe even in extreme operating environments. Furthermore, the device is RoHS compliant and is available in a wide range of package options, including SOT-23, SOT-223, and SOT-343.

The LM317MADTRK is a highly advanced voltage regulator enabling high efficiency and low-noise power system design. The low on-resistance, high input/output headroom and fast settling time make this device ideal for a wide range of applications. Combined with its programmable shutdown threshold, sequencing capabilities, and RoHS compliance, the device offers an attractive solution for a wide range of applications.

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