EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX20079 Automotive 36V 3.5A Buck Converter with 3.5A Iq General Description Benefits and Features The MAX20079 is a small, automotive grade synchronous Synchronous DC-DC Converter with Integrated FETs buck converter with integrated high-side and low-side 3.5A Output-Current Capability switches. The device is designed to deliver up to 3.5A with 3.5A Quiescent Current in Standby Mode input voltages from +3V to +36V while using only 3.5A Small Solution Size Saves Space quiescent current at no load. The MAX20079 provides an 65ns Minimum On-Time accurate output voltage of 2% within the normal opera- 2.1MHz or 400kHz Fixed Operating Frequency tion input range of +6V to +18V. With 65ns minimum on- Options time capability, the converter is capable of large input-to- Programmable 3V to 12V Output Voltage or output conversion ratios. Voltage quality can be monitored Fixed 5V/3.3V Options Available by observing the PGOOD signal. MAX20079 can operate Fixed 3.5ms Internal Soft-Start in drop-out by running at 99% duty cycle, making it ideal Innovative Current-Mode-Control Architecture for automotive and industrial applications. The IC offers Minimizes Total Board Space and BOM Count standard parts with fixed output voltages of 3.3V and 5V. In addition, MAX20079 can be configured for output volt- PGOOD Output and High-Voltage EN Input Simplify ages from 3V to 12V, using an external resistor divider. Power Sequencing Frequency is internally fixed at 2.1MHz, which allows for Protection Features and Operating Range Ideal for small external components, reduces output ripple, and Automotive Applications guarantees there is no AM interference. A 400kHz option 3V to 36V Operating V Range IN is also offered to provide minimum switching losses and 40V Load-Dump Protection maximum efficiency. MAX20079 automatically enters skip 99% Duty-Cycle Operation with Low Dropout mode at light loads with ultra-low quiescent current of -40C to +125C Automotive Temperature Range 3.5A at no load. It offers pin-enabled spread-spectrum AEC-Q100 Qualified frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency. Ordering Information appears at end of data sheet. The MAX20079 comes in a small 4mm x 4mm 20-pin SW-TQFN package and uses very few external compo- nents. The intelligent package layout results in an extreme- ly low-noise solution with superior EMI performance. Applications Automotive Industrial High Voltage DC-DC Converters 19-100465 Rev 2 4/19MAX20079 Automotive 36V 3.5A Buck Converter with 3.5A Iq Simplified Block Diagram SPS SYNC REF EN HVLDO BANDGAP OSC BST BIAS SUP CLK CURRENT SENSE SOFTSTART + SLOPE COMP LOGIC LX OUT CONTROL BIAS PWM EAMP FB FB SW1 MAX20079 COMP V/RESET GND SW2 PGOOD Maxim Integrated 2 www.maximintegrated.com