MP8845GC-P

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PMIC (Power Management Integrated circuits) is an important part of an integrated circuit that deals with the power conversion from one electrical form to another. Voltage regulators are a key component in PMICs and it is important for them to be precise and reliable. They usually come in two varieties, linear and switcher voltage regulators. DC DC switching regulators are power conversion devices designed to take in a low-voltage input and providing a regulated output voltage. These devices are widely used due to its controllability and relatively high efficiency compared to linear regulators.

The MP8845GC-P is a PMIC integrated circuit that comprises of a fixed/adjustable low dropout linear voltage regulator plus a DC DC step-up (Buck-Boost) switching regulator. The integrated circuit is a compact 2-W power solution that can be used in a wide range of products such as handsets, PCMCIA or PC cards, tablets, and other portable device. The device is also suitable for powering a wide range of external devices like LEDs, lasers, and cameras.

The MP8845GC-P features a PFM/PWM/PFM+PWM selectable buck-boost converter with a wide input voltage range of 2 V to 7.5 V. The adjustable output voltage of the converter ranges from 1.8 V to 5.2 V and the rated output current is up to 1 A. The converter also features a high efficiency of 90% and a fast switching frequency of 500 kHz. The device also has a low dropout linear voltage regulator with a wide adjustable output voltage range of 0.9 V to 3.6 V and 800 mA maximum output current. Other features of the device include power good pin and over-current protection mechanism.

The MP8845GC-P offers a high integration and functionality, making it well suited for applications such as portable media players, Digital STB and Portable devices, etc. It can also be used with low-power processor off-load and power supply systems. The device comes in a 2.6*2.6mm TDFN package and can operate in the temperature range of -40°C to +85°C.

Working Principle

The MP8845GC-P integrates both a buck-boost switching regulator and low dropout linear regulator for its power conversion functions. The device first takes in an AC-to-DC voltage through an input voltage source. The input power is then routed to the two regulators for further processing. The buck-boost switching regulator steps up or down the input voltage, depending on the load requirement. The output voltage of the regulator is then stabilized by the low dropout linear regulator.

The MP8845GC-P features a constant-frequency PWM or PFM/PWM auto-selecting mode, adjustable switching frequency, input voltage range up to 7.5V and fast load transients. It also offers a high efficiency of up to 90% and can handle a maximum load current of 1A. The output voltage of the device is also adjustable over a wide range of 0.9V to 3.6V. The device also includes a power good pin and over-current protection mechanism that ensures maximum safety.

In conclusion, the MP8845GC-P is an integrated PMIC device that comprises a fixed/adjustable low dropout linear voltage regulator plus a DC DC step-up (Buck-Boost) switching regulator. It is designed for applications such as portable media players, Digital STB, Portable devices and other low-power off-load systems and can handle up to 1 A of load current. The device features a high efficiency of up to 90%, adjustable switching frequency, and a wide adjustable output voltage of 0.9V to 3.6V. It is housed in a 2.6*2.6mm TDFN package and can operate in the temperature range -40°C to +85°C.

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