MAX4420EPA

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The MAX4420EPA ("MAX4420"), a PMIC – Gate Drivers, is a fully integrated, logic level-shifting, high-side FET driver, housed in a small 3-mm × 3-mm thermally enhanced TDFN package, specifically designed to drive Power MOSFETs and IGBTs. It is configured to accept either a push-pull input signal (IN+ and IN- with alternating levels) or a logic level signal (IN+ and ground). The MAX4420 integrates low on-resistance and low capacitance to simplify the gate drive circuit, and the resulting lower gate resistance and minimization of power dissipation. It also provides protection from overvoltage and overcurrent conditions, including an HV failure mode, allowing users to reduce system design complexity and comply with various safety regulations.

The MAX4420EPA application field covers a wide range of products. Examples include a power switch for adapter, DC-DC converters, AC/DC converters, lighting systems, automotive and industrial inverters, renewable energy applications, and other high-power switching applications. In such applications, the MAX4420 is the ideal choice for designs that require the easy driving of power switches with the benefit of improved heat dissipation or complex protection features. Furthermore, the product’s high level of integration helps designers keep their costs and board space low.

To understand the working principle of MAX4420EPA, let’s take a look at its key specs. The typical standby current is 500nA. When the input logic signal (IN+ and ground) is applied to the IC, the FET is driven for fast turn-on or turn-off. The ON-resistance of the presented FET is from RDS(on) = 1.0Ω, allowing for a wide range of operating currents. The maximum peak output current can be up to 7A, which is enough for most high power switching applications. Additionally, the input voltage range is from 5 to 14V, and the output voltage range is from 0 to 6V.

The MAX4420 also includes overvoltage protection (OVP) and overcurrent protection (OCP) input pins to ensure robustness in harsh conditions. When the voltage at the OVP pin exceeds the OVP voltage (6.5V), the device will shut down. Similarly, if the currents at the OCP pin are higher than the OCP current (7A), the internal drive will be shut off and no current will flow through the output stage. This helps to prevent possible damage or overloading of power switches in adverse conditions.

The MAX4420EPA gate driver is an ideal device for many applications due to its outstanding power performance and integrated protection features. It provides the necessary high speed switching performance with low input capacitance, making it suitable for driving various power MOSFETs and IGBTs. Its ability to provide robust performance in extreme environments makes it ideal for many applications in adapter, DC/DC, lighting systems and industrial inverters.

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