MP28275EL-LF-P

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The MP28275EL-LF-P is a low-Dropout, fixed (LDO) voltage regulator with an adjustable output voltage range. It is part of a family of DC-DC switching regulators from Monolithic Power Systems (MPS).

Application field

The MP28275EL-LF-P is designed to provide a regulated output voltage in the range of 0.7V to 6V. It can be used in many type of applications needing high efficiency, low standby current and tight regulation, such as personal computers, portable equipment, and other battery-powered applications. The device is also suitable for low-noise, high-efficiency DC-DC voltage regulation in consumer electronics, cellular handsets, and RF transceivers.

Working Principle

The MP28275EL-LF-P offers two operating modes: pulse frequency modulation (PFM) and pulse width modulation (PWM). In PFM mode, the MOSFET current is modulated to regulate the output voltage. In PWM mode, the MOSFET duty cycle is modulated to regulate the output voltage. The switching frequency of the device is adjustable. The device also has programmable output voltage tracking, multiple power-good indicators, built-in over temperature protection, and soft-start circuitry.

The device utilizes a two-phase voltage control loop to maintain the specified output voltage and current. In this configuration, one constant-frequency current source is connected in series with the output voltage feedback. This voltage feedback allows the output voltage to be regulated. The feedback loop also contains an error amplifier, which amplifies the difference between the output voltage and a preset threshold voltage.

The MP28275EL-LF-P is a monolithic device manufactured using MPS’s proprietary submicron CMOS process. It features advanced MOSFET technology, multiple output voltages, a wide input voltage range, low input peak current and minimal bias current for improved efficiency. In addition, built-in EMI filters and regulated sleep mode enable compliance with FCC requirements.

Conclusion

The MP28275EL-LF-P is a low-dropout, fixed voltage regulator designed to provide a regulated output voltage in the range of 0.7V to 6V. It contains two operating modes: Pulse Frequency Modulation and Pulse Width Modulation. It is highly efficient, with low standby current and tight regulation, and offers multiple power-good indicators and over-temperature protection. It is suitable for low-noise, high-efficiency DC-DC voltage regulation in consumer electronics, cellular handsets, and RF transceivers.

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