2.1MHz, High-Voltage, 1A Mini-Buck Converter

The MAX16903 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver 1A with input voltages from +3.5V to +28V while using only 25µA quiescent current at no load. Voltage quality can be monitored by observing the PGOOD signal. The MAX16903 can operate in dropout by running at 97% duty cycle, making it ideal for automotive and industrial applications.

The MAX16903 operates at a 2.1MHz frequency, allowing for small external components and reduced output ripple. It guarantees no AM band interference. SYNC input programmability enables three frequency modes for optimized performance: forced fixed-frequency operation, skip mode (ultra-low quiescent current of 25µA), and synchronization to an external clock. The MAX16903 can be ordered with spread-spectrum frequency modulation, designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX16903 is available in a thermally enhanced, 3mm x 3mm, 10-pin TDFN package or a 16-pin TSSOP package. The MAX16903 operates over the -40°C to +125°C automotive temperature range.

Applications

* Automotive * High-Voltage Input-Power DC-DC Applications * Industrial

* Meets Stringent Automotive Quality and Reliability Requirements

* +3.5V to +28V Input Voltage Range Allows Operation in "Cold Crank" Conditions

* Tolerates Input-Voltage Transients to +42V

* Enable-Pin Compatible from +3.3V Logic Level to +42V

* 1A Minimum Output Current with Overcurrent Protection

* -40°C to +125°C Automotive Temperature Range

* AEC-Q100 Qualified

* Increased Efficiency and Reduced BOM Cost and Board Space

* Integrated High- and Low-Side FETs

* Fixed Output Voltages (see the Selector Guide in the full data sheet and Contact the Factory for All Available Trimmed Output-Voltage Options)

* 10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages

* Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements

* 25µA Quiescent Current During Skip Mode Operation

* High Switching Frequency Allows Use of Small, Low-Cost External Components

* 2.1MHz Switching Frequency with Three Modes of Operation

* Skip Mode for Efficient, Low-Power Operation

* Forced Fixed-Frequency Operation

* External Frequency Synchronization

* Reduced EMI Emissions at the Switching Frequency

* Optional Spread-Spectrum Frequency Modulation