LX1661CN

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The LX1661CN is a very versatile and high performance special purpose voltage regulator. It was designed for use in applications requiring a wide range of voltage regulation for precision power supplies and other applications. The device has very high efficiency, low drop voltage and maximum flexibility for adjusting output voltage.

The LX1661CN has a wide input voltage range from 2.1 V up to 15 V and is suitable for negative or positive power supplies. It has an integrated over voltage protection and adjustable current limiter to ensure safety and robustness. An internal bandgap reference provides stable low temperature drift, enabling precision voltage regulation and low output voltage ripple. Output voltage is adjustable via a logic-controlled voltage set pin and an external resistor network.

This device features a built-in output current limiter, which is adjustable through a single external resistor. The output current limit can be adjusted over a wide range depending on the external resistor, allowing control of the output current as a function of load and temperature. The LX1661CN also features an Endurance Mode, which limits the device\'s power dissipation at low load currents and improves efficiency. Other features include a thermal shutdown, reference under-voltage protection, and short-circuit protection.

The working principle of the LX1661CN is based on a linear regulator. A large MOSFET with a drive circuit is connected at the output. The output voltage is regulated with an internal error amplifier. The error amplifier is connected to a voltage divider at the output, where the feedback voltage is compared with a stable voltage reference. When the output voltage does not match the reference voltage, the error amplifier changes the MOSFETs drive, thus regulating the output voltage. The voltage reference tracks the external voltage setpin so that the output voltage can be adjusted.

The LX1661CN is ideal for use in point-of-load converters, distributed power supplies, battery-backed source converters, miniature power supplies, and remote-sensing voltage regulators. It offers excellent performance, low noise and power consumption, and a high level of protection in a wide variety of applications.

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