36V, 2.5A/3.5A, Fully Integrated Synchronous Buck Converter

The MAX42402/MAX42403 IC are a tiny synchronous buck converter with integrated high-side and low-side switches. The MAX42402/MAX42403 are designed to deliver up to 2.5A/3.5A with a wide, 4.5V to 36V input voltage range. Voltage quality can be monitored by observing the PGOOD signal. The IC can operate in dropout by running at 99% duty cycle, making it ideal for industrial applications.

The MAX42402/MAX42403 offer externally programmable output voltage. Fixed internal frequency options of 1.5MHz/400kHz are available, which allow for small external components and reduced output ripple.

When SYNC is low, the MAX42402/MAX42403 automatically enter skip mode at light loads with an ultra-low quiescent current of 27uA at no load. A pin-selectable forced-PWM mode is also available, which helps to improve EMI performance. The devices have a spread-spectrum frequency modulation option designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX42402/MAX42403 are available in a small, 3mm x 3mm FC2QFN package and uses very few external components.

Applications

* Industrial Automation

* Point-of-Load

* Distributed DC Power Systems

* Multiple Functions for Small Size

* Operating Input Voltage Range: 4.5V to 36V

* Synchronous DC-DC Converter with Integrated FETs up to 2.5A/3.5A

* 27μA Quiescent Current in Skip Mode

* 1.5MHz/400kHz Switching Frequency

* Spread-Spectrum Option

* Internal Soft-Start

* 2.5ms for 400kHz

* 3.5ms for 1.5MHz

* Programmable Output Voltage

* 0.8V to 14V for 400kHz

* 0.8V to 12V for 1.5MHz

* 99% Duty Cycle Operation with Low Dropout