MIC5191BMM

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The MIC5191BMM is an extremely small, integrated linear voltage regulator controller with digital soft-start. It is primarily used in applications such as flat panel display (FPD), portable device and mobile device. The regulator can provide fast, accurate, low-noise, fixed-output precision voltage regulation with excellent transient response performance. Operating over a wide input voltage range, the MIC5191BMM provides specifically designed temporal redundancy control and load oriented CP PMOS control, leading to superior transient response. It also has an extended true-off capability for low power dissipation. All of these features help to provide improved power efficiency, reliability, and obedience to the strictest of modern industry standards.

The working principle of the MIC5191BMM is based on an error amplifier. The output voltage of the regulator is specified by the user-defined reference voltage input that is compared with the output voltage feedback from the resistor divider network. Once the error amplifier determines there is a difference between its inputs, it activates the control logic. The control logic then decides whether to drive its output to increase the PMOS gate voltage or to decrease it to the ground level, making the output voltage closer to the desired reference voltage.

The MIC5191BMM features on-chip soft-start control that can be used to reduce the start-up inrush current of the power supply. The digital soft-start feature also reduces the stress on other power supplies in the system. In addition, the MIC5191 is designed to provide an extended true-off capability with a lower than 0.1 µA shutdown current, making the device compliant with most recent energy efficiency standards such as Energy Star and CE.

The MIC5191BMM is specifically designed for use in 5V systems with up to 4A output current. It is capable of operating from 2.5V to 5.5V rails, allowing for high-side N-channel MOSFET switch configurations and providing a wide input voltage range. It also features high-side current sensing, along with adjustable current sense amplifier, allowing it to further reduce energy consumption. Additionally, the dual line output voltage tracking eliminates the need for external resistors.

The MIC5191BMM is extremely easy to use and cost effective. It features high accuracy with low-noise operation and an integrated digital soft-start controller. It is an ideal solution for space-restricted, cost-sensitive and low-power applications. It is a perfect choice for flat panel displays, portable electronics and mobile devices alike, and is compliant with most industry standards.

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