MAX17509ATJ+

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Introduction

MAX17509ATJ+ is a compact and high performance DC/DC switching regulator designed to deliver precision, low-noise power in a wide range of applications, such as in microprocessor or logic core supply applications. It integrates a high-efficient DC/DC switching regulator, a synchronous rectifier and thermal protection circuitry into one 8-pin package.

Application Field

The MAX17509ATJ+ is designed to power a variety of embedded processors and memory applications in the Industrial and Communication markets, such as Wi-Fi, Bluetooth and ZigBee wireless systems, DC/DC converters for automotive, networking devices and embedded control systems, as well as for voltage monitoring and sequencing. The MAX17509ATJ+ combines ultra-low quiescent current of 200µA and high efficiency (up to 95%) with a wide operating temperature range of -40°C to +125°C. This product is available with a full suite of protection features, including over-voltage protection, over-current protection, and over-temperature protection.

Working Principle

The MAX17509ATJ+ DC/DC switching regulator operates with pulse-width modulation (PWM) to control the output voltage. In PWM mode, the DC/DC switching regulator works by charging an internal capacitor to create a voltage above the output voltage, then controlling its conduction to ground when the output voltage reaches the target level. This provides a high degree of regulation accuracy, and the output can be regulated over a large input voltage range, usually from 2.5V to 16V. The output voltage is set through a simple voltage divider and can be adjusted as required at any time.

The MAX17509ATJ+ also supports a hysteretic mode for low-load conditions. In hysteretic mode, the device does not use pulsewidth modulation to regulate the output voltage, but instead switches between two target voltages. This mode reduces switching noise, increases efficiency, and increases the power supply\'s lifetime in low-load conditions.

The MAX17509ATJ+ comes with an integrated synchronous rectifier, which increases efficiency and eliminates the need for an external diode, reducing cost and system complexity. In addition, thermal monitoring and protection circuitry are integrated into the device, which provides efficient and reliable protection against hazardous environment conditions and prevents damage to the system. In the event of an over-temperature condition, the device will go into a safe shutdown mode until the temperature is safe.

Conclusion

The MAX17509ATJ+ DC/DC switching regulator is a highly efficient device designed to provide a wide input voltage range, low noise and long hold-up time in a wide range of applications. It helps to significantly reduce system cost and complexity, while providing reliable over-voltage, over-current, and over-temperature protection.

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