MAX1688ESA

PMIC - Voltage Regulators - DC DC Switching Regulators

MAX1688ESA is a monolithic step-up DC/DC switching regulator that operates from 1.2V to 5.5V input voltage and provides an output voltage up to 18V. The power supply of up to one hundred milliwatts is possible with this chip. It operates at a frequency of 500 KHz, allowing for minimized external components and high efficiency. The device consumes only 5 μA at no load, allowing flexibility with the system design.

Application Fields

The primary use of the MAX1688ESA is in small, portable electronics, such as mobile phones, PDAs, and digital cameras. It offers high efficiency, allowing the device to be powered longer, allowing a better experience for the user. The device\'s small size and flexible input voltage range make it a great choice for embedded and portable applications. Additionally, the MAX1688ESA can provide the power required by displays and other high-power peripherals.

Working Principle

The MAX1688ESA utilizes a traditional step-up switching regulator topology, which is able to provide output voltage much higher than the input voltage. The device consists of two main blocks - the pulse-width modulation (PWM) controller and the power switch (MOSFET). The PWM controller is responsible for generating the control signals for the power switch, such as the on- and off-times, allowing the device to operate at the desired set frequency.

The PWM controller receives the input voltage and compares it with a reference voltage, which is generated internally by an error amplifier. When the voltage difference is larger than a certain threshold, the PWM controller turns the power switch on, which then begins conducting current from the input source to the output capacitor, creating a higher output voltage, up to eighteen volts. When the voltage difference is lower than the threshold, the power switch is turned off, and the output voltage is maintained at the set level.

The MAX1688ESA contains additional features for increased protection and performance. These include over-voltage protection, under-voltage protection, output current limit, switching frequency synchronization, and thermal protection. The device also uses a high-switch life power switch to deliver reliable and cost-effective performance.

Conclusion

The MAX1688ESA monolithic step-up DC/DC switching regulator is an ideal choice for small portable electronics. It is versatile, efficient, and provides protection against over-voltage, under-voltage, short-circuit, and thermal issues. The device\'s high-quality construction and long switching life make it an ideal choice for powering embedded and portable applications, including displays and peripherals.