General Description

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.

Benefits and Features

● 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 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

Applications

● Automotive

● Industrial

● High-Voltage Input-Power DC-DC Applications