LM2686MTCX/NOPB

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LM2686MTCX/NOPB Application Field and Working Principle

The LM2686MTCX/NOPB is versatile high-frequency synchronous buck regulator manufactured by Texas Instruments. It blends the low noise performance of linear regulators with the high power conversion of switching regulators into a small, low-cost package. This device is well suited for a variety of applications such as RF transmitters, industrial automation systems, instrumentation, and point-of-load supplies. The device is also ideal for notebook computers and other small-form-factor modules.

Features

The LM2686MTCX/NOPB features a Tiny power inductor that provides high efficiency when used with simple passive components. The buck regulator typically operates with a 340kHz switching frequency and has an external synchronization circuit for the switching frequency up to 600kHz. It offers a 2.5V to 5.5V operating voltage range, an adjustable output voltage range from 0.75V to 5V, and a maximum continuous output current of 2.5A. The device is also capable of up to 4.7A output current in pulse mode, making it useful for short bursts of power. It includes long-term thermal warning circuitry, an internal compensation network, and an adjustable soft-start, reducing the time required for the regulator to achieve steady-state conditions. There is also output voltage tracking and differential amplifier with gain, providing high loop-stability and accurate tracking of output voltages.

Applications

The LM2686MTCX/NOPB is suitable for a wide range of applications including point-of-load supplies, RF transmitters, industrial automation systems, instrumentation, and notebook computers. The device is well suited to applications that require high-efficiency, low noise and excellent load-transient performance. It is also ideal for applications that require low output voltage ripple and fast load transient response.

Working Principle

The LM2686MTCX/NOPB is capable of providing both switching and linear regulation. The operating mode and output voltage of the device are both user-programmable and are controlled by the EN pin and the RESET pin. The EN pin is used to select between switching and linear regulation. When the EN pin is asserted, the device will regulate the output voltage in a buck (DC-to-DC switching) topology. When the EN pin is deasserted, the device will regulate the output voltage in a linear (DC-to-DC linear) topology. The RESET pin is used to adjust the output voltage of the device. When the RESET pin is asserted, the output voltage of the device will adjust to the programmed value. The device implements a standard voltage feedback loop, where the voltage error signal is compared to a reference voltage and the result is used to control the switching frequency of the internal switch.

The LM2686MTCX/NOPB contains an internal synchronous P-channel MOSFET and an internal N-channel MOSFET, which together form a buck converter. During the high side switch turn-on, the voltage across the inductor is ramped up. As the a switch is turned off, the energy stored in the inductor is transferred to the output capacitor, providing the output voltage for the LM2686MTCX/NOPB. The device also uses an external low-side switch that is used to discharge the output voltage for soft-start and stop operation.

To protect the device from overvoltage or overload conditions, the LM2686MTCX/NOPB includes several internal current and voltage protection circuits. The device also includes a temperature warning circuit that can be enabled or disabled depending on the application. The LM2686MTCX/NOPB is available in a very small QFN package, making it ideal for space constrained applications.

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