LM2678SD-ADJ

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LM2678SD-ADJ is an adjustable voltage regulator integrated circuit (IC) in the DC/DC Electronic Switched Voltage Regulator (ESVR) product family by Texas Instruments. It is designed to provide a complete step-down solution with a wide input voltage range of 4.4 V to 50 V and an adjustable output voltage range of 1.5 V to 37 V. The output current is rated at 5 A and the output can be adjusted from 2.5 V to the maximum 37 V. The adjustable voltage feature is especially useful for applications that require multiple output options. Additionally, the device features an integrated power MOSFET (PMOS) and inductor, making it a compact and economical solution for DC voltage regulation.

The LM2678SD-ADJ features an integrated phase-lock loop (PLL) controller that works in conjunction with an external 25 MHz clock signal to provide pulse width modulation (PWM) control, which in turn modulates the output voltage. In addition, the device can support a constant input current mode of operation that helps save energy by limiting the input current to a desired level. The device also supports a thermal shutdown mode to protect against damage caused by excessive heat.

The power stage of LM2678SD-ADJ consists of a PMOS, an inductor, a Schottky diode, and two capacitors. The power stage operation is triggered by the PWM of the integrated PLL controller that determine the on and off times of the PMOS. When the PMOS device is switched on, the current from the input voltage is allowed to flow through the inductor, storing the energy. During the off-time period, the inductor releases the stored energy to the output. The Schottky diode is used to provide a path for the output current when the PMOS switches off. The output voltage is regulated by adjusting the duty cycle of the PWM signal.

The LM2678SD-ADJ features a soft-start circuitry which works by connecting a capacitor between the VID signal and ground. During the startup process, the capacitor is charged linearly to adjust the output voltage, and after the desired voltage has been achieved, it is kept constant by the PLL controller. This avoids the massive inrush current at startup, adds stability to the output voltage, and reduces the power dissipation. The device also has a power good flag output to indicate the voltage status at the output, and an enable signal input to control power to the device.

The LM2678SD-ADJ is an excellent choice for designs that require an adjustable voltage regulator with power conversion efficiency of up to 91%. The device is intended for applications such as distributed power, point of load, and motor speed control, as well as applications with long input voltage ranges and multiple output voltage options. It is available in a wide selection of package styles, making it a compact and reliable solution for power management needs.

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