EVALUATION KIT AVAILABLE MAX16903 2.1MHz, High-Voltage, 1A Mini-Buck Converter General Description Benefits and Features The MAX16903 is a small, synchronous buck converter Meets Stringent Automotive Quality and Reliability with integrated high-side and low-side switches. The Requirements device is designed to deliver 1A with input voltages +3.5V to +28V Input Voltage Range Allows from +3.5V to +28V, while using only 25A quiescent Operation in Cold Crank Conditions current at no load. Voltage quality can be monitored by Tolerates Input-Voltage Transients to +42V observing the PGOOD signal. The MAX16903 can Enable-Pin Compatible from +3.3V Logic Level to operate in dropout by running at 97% duty cycle, making +42V it ideal for automotive and industrial applications. 1A Minimum Output Current with Overcurrent Protection The MAX16903 operates at a 2.1MHz frequency, allow- -40C to +125C Automotive Temperature Range ing for small external components and reduced output AEC-Q100 Qualified ripple. It guarantees no AM band interference. SYNC input programmability enables three frequency modes Increased Efficiency and Reduced BOM Cost and for optimized performance: forced fixed-frequency opera- Board Space tion, skip mode (ultra-low quiescent current of 25A), and Integrated High- and Low-Side FETs synchronization to an external clock. The MAX16903 can Fixed Output Voltages (see the Selector Guide be ordered with spread-spectrum frequency modulation, and Contact the Factory for All Available Trimmed designed to minimize EMI-radiated emissions due to the Output-Voltage Options) modulation frequency. 10-Pin TDFN-EP or 16-Pin TSSOP-EP Packages The MAX16903 is available in a thermally enhanced, Low Quiescent Current Helps Designers Meet 3mm x 3mm, 10-pin TDFN package or a 16-pin TSSOP Stringent OEM Current Requirements package. The MAX16903 operates over the -40C to 25A Quiescent Current During Skip Mode +125C automotive temperature range. Operation High Switching Frequency Allows Use of Small, Applications Low-Cost External Components Automotive 2.1MHz Switching Frequency with Three Modes of Industrial Operation High-Voltage Input-Power DC-DC Applications Skip Mode for Efficient, Low-Power Operation Forced Fixed-Frequency Operation Ordering Information External Frequency Synchronization SPREAD TEMP PIN- Reduced EMI Emissions at the Switching Frequency PART SPECTRUM RANGE PACKAGE Optional Spread-Spectrum Frequency Modulation -40C to MAX16903RAUE /V+ Disabled 16 TSSOP-EP* +125C -40C to MAX16903RATB /V+ Disabled 10 TDFN-EP* +125C -40C to MAX16903SAUE /V+ Enabled 16 TSSOP-EP* +125C -40C to MAX16903SATB /V+ Enabled 10 TDFN-EP* +125C Note: Insert the desired suffix letters (from the Selector Guide) into the blanks to indicate the output voltage. Alternative output voltages available upon request. +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. *EP = Exposed pad. 19-5038 Rev 10 4/17MAX16903 2.1MHz, High-Voltage, 1A Mini-Buck Converter Typical Operating Circuits 33k V LEVEL BAT SUP EN SIGNAL * 4.7F MAX16903 50/V+ SYNC BST GND 0.1F 4.7H 5V AT 1A LX PGOOD 10F PGND BIAS 20k OUTS 2.2F 33k V LEVEL BAT SUP EN SIGNAL * 4.7F MAX16903 33/V+ SYNC BST GND 0.1F 3.3H 3.3V AT 1A LX PGOOD 10F PGND BIAS 20k OUTS 2.2F *PLACE INPUT SUPPLY CAPACITORS AS CLOSE AS POSSIBLE TO THE SUP PIN. SEE THE APPLICATIONS INFORMATION SECTION FOR MORE DETAILS. Maxim Integrated 2 www.maximintegrated.com