LM2678SDX-ADJ/NOPB

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LM2678SDX-ADJ/NOPB are adjustable and non-adjustable switch regulators manufactured by Texas Instruments. These devices are used for voltage conversion and regulation in DC applications. The LM2678SDX-ADJ/NOPB is a 3-terminal switching regulator that efficiently and quickly adjusts a voltage output within a wide input voltage (VIN) range of 4.0 V to 38 V. LM2678SDX is offered in an 8-pin SOIC (Small Outline IC) package with exposed pad, which is the standard power IC package and suitable for most standard DC applications.

The LM2678SDX-ADJ/NOPB can be used as a buck or boost switch regulator and provides an adjustable output voltage. As a buck regulator, LM2678SDX can step down the input voltage to an output voltage as low as 0.8V. As a boost regulator, it can increase the input voltage up to 36 V. The LM2678SDX-ADJ/NOPB has a switching frequency of up to 500 kHz, which allows for faster voltage conversion.

The LM2678SDX-ADJ/NOPB features an adjustable 7.5 A current limit and thermal protection. The device is designed to consume low quiescent current (Iq) and offers a low-noise operation. It has a wide input voltage range and provides integrated protection against short-circuit, over-current and thermal-shutdown.

The device enables an output voltage adjustment with an external resistor divider network. The device is easy to use and provides excellent line and load regulation over temperature and input voltage variations. The LM2678SDX-ADJ/NOPB can be used as a voltage regulator, or as a battery charger, with its adjustable current limit capabilities.

The LM2678SDX-ADJ/NOPB is well-suited for many applications such as buck and boost converters, remote power supply, AC/DC adapters, battery management systems and motor control. It can also be used for supplying current to RAM and ROM memory, LCD displays and D/A converters.

The working principle of LM2678SDX-ADJ/NOPB is based on Pulse-Width Modulation (PWM). When a voltage is applied to the LM2678SDX switch pin, an input voltage of VIN is switched on and off with a constant frequency and a duty factor (D), depending on the required output voltage. The on-time (T) of the output switch and the duty cycle is determined by the Error Amplifier and the reference voltage, or external resistor values. Low-side and high-side N-channel MOSFETs are used in the LM2678SDX-ADJ/NOPB. When the voltage on the switch pin is low, the low-side MOSFET is turned on and the input voltage VIN is applied to the output filter, setting the output voltage VOUT. During the off-time, the low-side MOSFET is turned off and the high-side MOSFET is turned on, discharging the output filter, thus preventing the output voltage from rising.

In summary, the LM2678SDX-ADJ/NOPB belongs to the category of PMIC - Voltage Regulators - DC DC Switching Regulators, and it is a 3-terminal adjustable and non-adjustable switch regulator suitable for DC applications. The LM2678SDX-ADJ/NOPB offers low quiescent current and excellent line and load regulation, and its adjustable current limit feature makes it ideal for battery management and motor control. The device operates on Pulse-Width Modulation (PWM) and internally uses low-side and high-side N-channel MOSFETs for efficient and low-noise operation.

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