MAX9173EUE+

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The MAX9173EUE+ is an integrated mono receiver/driver designed to simplify the design of current-controlled LED lighting applications such as LED strips and LED light engines. The integrated solution features an input differential receiver, output driver, and a high-side current control circuit. The integrated solution helps reduce board area, external components, design complexity, and system costs. This article will discuss the application field and working principle of the MAX9173EUE+.

Application Field

The MAX9173EUE+ is designed for current-controlled LED lighting applications such as LED strips and LED light engines. It allows designers to precisely control current intensity in these applications. In addition, it helps reduce board area, external components and design complexity. This makes the MAX9173EUE+ an attractive solution for a number of applications.

The MAX9173EUE+ is ideal for use in applications that require a precise current intensity, such as LED general lighting, automotive lighting, and illumination systems. It is also well suited for applications that require a long line length, such as flexible lighting systems, as it can handle line lengths of up to 50 meters. In addition, the MAX9173EUE+ can operate over a wide supply voltage range (3.3V to 24V) making it suitable for applications that require power that is not consistent, such as battery-operated or solar-powered lighting applications.

Working Principle

The MAX9173EUE+ integrates a receiver, driver, and current control circuit into a single package to simplify LED lighting design. The integrated receiver and driver can drive up to two LEDs in parallel from separate ports. The receiver portion of the chip provides a differential input, allowing for flexibility in connecting up to two separate LED strings.

The integrated driver can sink up to 800mA for each LED string, and its output can be controlled by an external current set resistor or a PWM duty cycle. The current level can be set by selecting a merely external resistor, making the design simpler while minimizing external components.

In addition to the integrated receiver and driver, the MAX9173EUE+ also includes a high-side current control circuit, which is used to control the output current from the driver. This current is measured, amplified, and compared to a set level and is adjusted accordingly. This dedicated current control circuit maintains the output current within ±2% of the set level over the temperature range (-40°C to +125°C), ensuring that the LED current does not fluctuate over time.

The MAX9173EUE+ also includes integrated power-saving features, such as a power-on reset and over-temperature protection. When the chip is not used, the power-on reset feature disables the receiver and driver, reducing power consumption and maximizing battery life. In addition, the over-temperature protection feature monitors the die temperature and shuts down the system if the die temperature reaches a certain temperature.

In summary, the MAX9173EUE+ is an integrated mono receiver/driver designed to simplify the design of current-controlled LED lighting applications. It integrates a receiver, driver, and current control circuit into a single package, allowing designers to reduce board area and design complexity. Its wide supply voltage range (3.3V to 24V) allows for flexibility in applications, and the integrated power-saving features maximize battery life. With its ability to precisely control LED current intensity, the MAX9173EUE+ is an ideal solution for LED general lighting, automotive lighting, and illumination systems.

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