MAX4193ESA+T

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MAX4193ESA+T is a DC-DC switching regulator IC, a member of the PMIC (Power Management IC) family, specifically in the category of voltage regulators. The IC is specifically tailored to the needs of notebook computers, and the features and specifications are perfectly suited for laptop applications.

The main purpose of the MAX4193ESA+T is to provide a low voltage DC output, greater than the input voltage, in order to serve as the main power supply voltage of the host notebook computer system. In order to switch between the input and output correctly, the core of the IC consists of a dedicated pulse width modulation (PWM) controller, along with necessary power transistors, power MOSFETs, and other circuitry necessary to function correctly.

The input into the MAX4193ESA+T can be 5V up to 15V; the output has a maximum voltage of 19V, with a range of 3.3V to 18V. The output maximum current is listed as 2.6A, and the maximum power is rated at 45W. The IC offers advanced features like a simple 1.2V bandgap as a reference voltage, over current protection (OCP), and output voltage sequencing.

The basic MAX4193ESA+T operating principle can be divided into two parts: the closed loop, and the open loop. For the closed loop, the IC uses a voltage feedback loop to set the output voltage which will ultimately be achieved. The loop is composed of a PWM controller with a 1.2V refer- ence, a sensing network, a transconductance amplifier, and an error amplifier. The voltage feedback loop operates in a manner similar to classical voltage regulation circuits and is used primarily to ensure a stable, predetermined output voltage.

The open loop includes several features, like a soft-start circuit and over current protection (OCP). The current flowing during soft-start is controlled via a trip current ratio (TCR) and a reference current ratio (RCR) from an internal circuit. These two settings allow the designer to customize the response time necessary for the system to power-up correctly and within a certain acceptable waiting time. The OCP component monitors current changes across the inductors and will reset the circuit once the safe current levels are exceeded.

In terms of uses, the MAX4193ESA+T is ideal for regulating output voltages for laptop computers. The IC is designed to provide high efficiency, and operates over a wide input voltage range. The IC also provides many features such as output voltage sequencing, over current protection (OCP), soft-start, and much more.

Overall, the MAX4193ESA+T is an excellent choice for voltage regulators in notebook computers due to its compact size, advanced features, and accurate output voltages. It serves as a reliable power source that helps power notebook systems reliably and efficiently.

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