MIC2954-02BZ

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The MIC2954-02BZ is a voltage regulator which falls under the category of power-management integrated circuits (PMICs), more precisely within the Linear Voltage Regulators subsection. It is specifically designed for use in applications which require high levels of design flexibility, reliability and efficiency. The device is specially tailored for applications in which a large capacitance reserve is available.

Overview

The MIC2954-02BZ is based on a buck topology, a type of linear topology, and is used for both step-down and step-up (inverting) voltage regulation purposes. The device is able to accept an unregulated input voltage of up to 18V, providing a regulated output voltage as low as 0.7V (or as high as 18V if the input voltage is higher than the output voltage).

It is specifically designed to meet a number of specific requirements, including: low quiescent current consumption, low ripple and noise on the output voltage, fast transient response and relatively low output current consumption. The device also offers extensive power saving features, such as a low power shutdown feature and low voltage dropout, which improve the overall efficiency of the converter.

Features

The MIC2954-02BZ includes several features that make it ideal for use in power management applications:

• Wide input voltage range; up to 18V
• High efficiency: 98%
• Low quiescent current: only 2.2 mA
• Low noise: - 0.1% of the nominal output voltage
• Fast transient response
• Wide output voltage range: 0.7V to 18V
• High output current: up to 25 mA
• Protection features: over-temperature, current limit and under-voltage protection
• Compact size: small 4x2 mm QFN package

Pinout

The MIC2954-02BZ has an 8-pin QFN package and a single-ended wire connection. It has 5 pins on the top layer and 3 pins on the bottom layer. The pin layout is as follows:

The pins have the following functions: Vin is the input voltage, Vout is the output voltage, EN is the enable input, FB is the feedback pin, GND is the ground, FBP is the feedback reference pin, VSEN is the under-voltage lockout pin, and CS is the current-limit output.

Working Principle

The MIC2954-02BZ works on the principle of closed loop control of the output voltage. The circuit includes an error amplifier and a feedback voltage, which compare the output voltage with a reference voltage. When the two voltage levels do not match, the error amplifier applies a correction signal to the step up or step down converter, depending on how large the error is.

The device also includes features such as under-voltage lockout (VSEN pin) and current-limit protection (CS pin). The device also has a low power shutdown feature which helps reduce power consumption when the device is not in use. This helps to reduce thermal stress and improve the power efficiency of the system.

Applications

The MIC2954-02BZ is designed for use in a wide range of power management applications, such as automotive, consumer, industrial, medical and communications. It can also be used in applications which require high levels of design flexibility, reliability and efficiency, such as automotive telematics, industrial motor control and medical instrumentation applications.

The device is also well suited for applications where the output voltage needs to be precisely regulated, such as LED lighting, LED backlighting, and battery charging. Its wide output voltage range and high efficiency makes it ideal for a variety of power management applications.

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