MP2107ADN-LF

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MP2107ADN-LF is a constant current output and high efficiency synchronous step-down voltage regulator designed for a wide range of equipment powered by lithium ion batteries, such as tablet computers, mobile phones, digital cameras and media tablets. The device integrates a low-on-resistance power switch and a synchronous rectifier to achieve high efficiency under light load conditions. It provides over-current protection, soft start and fast transient response.

The maximum input voltage of the MP2107ADN-LF is slightly lower than the output voltage range, so it can be powered directly from the battery without the need of an additional step-up converter. The switching frequency of the device is adjustable from 500 kHz to 2 MHz, allowing the user to optimize the part for area, efficiency, or noise level. The device supports an adjustable output voltage range from 0.6 V to 1.8 V with a safe drop-out voltage of 0.3 V.

The MP2107ADN-LF works in a step-down architecture as a synchronous buck regulator, also known as a buck-boost regulator. It uses two switch transistors and a synchronous rectifier connected in pairs, to alternatively act as two opposite transistors in the same circuit, driven by two complementary pulses. By switching the transistors on and off at a high frequency, they act as two switches, allowing current to flow in one direction and not in the other, thereby creating a PWM output at the desired frequency.

The key feature of this chip is that it supports high efficiency buck-boost operation. When the system demands a lower voltage than is provided by the input, a synchronous buck converter is implemented. Similarly, when a higher voltage is required, a buck-boost converter is used instead. This buck-boost operation ensures that the device can provide effective voltage regulation at all times.

The MP2107ADN-LF can handle up to 1 A of output current, which makes it suitable for applications from consumer electronics to industrial products. The device also has excellent line and load transient response and supports adjustable output voltage, current limit and soft start functions.

In summary, the MP2107ADN-LF is an ideal choice for a wide range of Apollo devices requiring a constant current output and high efficiency at light loads. With its excellent features and high efficiency operation, it can make significant contributions to Apollo applications.

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