Click here to ask about the production status of specific part numbers. MAX25231 36V, 1.2A Mini Buck Converter with 3.5A I Q General Description Benefits and Features The MAX25231 is a small, synchronous automotive buck Synchronous DC-DC Converter with Integrated FETs converter with integrated high-side and low-side switches. 3.5A Quiescent Current when in Standby Mode The MAX25231 is designed to deliver up to 1.2A, with Small Solution Size Saves Space 3.5V to 36V input voltages, while using only 3.5A quies- 2.1MHz Frequency cent current at no load. The device provides an accurate Fixed 5V/3.3V Output Voltage Options Available output voltage of 2% within the normal operation input Fixed 2.5ms Internal Soft-Start range of 6V to 18V. With 65ns minimum on-time capabili- Fixed Output Voltage with 2% Output Accuracy ty, the converter is capable of large input-to-output conver- Adjustable Voltage Output 3V to 10V Available sion ratios. Voltage quality can be monitored by observ- (MAX25231ATCD) ing the PGOOD signal. The device can operate in dropout Innovative Current-Mode-Control Architecture by running at 99% duty cycle, making it ideal for automo- Minimizes Total Board Space and BOM Count tive and industrial applications. The device offers two fixed PGOOD Output and High-Voltage EN Input Simplify output voltages of 5V and 3.3V. Frequency is internally Power Sequencing fixed at 2.1MHz, which allows for small external compo- Protection Features and Operating Range Ideal for nents and reduced output ripple, and guarantees no AM Automotive Applications interference. The device automatically enters skip mode 3.5V to 36V Operating VIN Range at light loads with ultra-low quiescent current of 3.5A at 40V Load-Dump Protection no load. The device offers pin-enabled spread-spectrum 99% Duty-Cycle Operation with Low Dropout frequency modulation designed to minimize EMI-radiated -40C to +125C Automotive Temperature Range emissions due to the modulation frequency. AEC-Q100 Qualified The MAX25231 is available in a small (3mm x 3mm) 12-pin TDFN package with an exposed pad, and uses Ordering Information appears at end of data sheet. very few external components. Applications Automotive Always-On, Low-Quiescent-Current Systems Industrial High-Voltage DC-DC Converters 19-100881 Rev 2 5/21MAX25231 36V, 1.2A Mini Buck Converter with 3.5A I Q Simplified Block Diagram SPS SYNC MAX25231 REF EN HVLDO BANDGAP OSC BST BIAS SUP CLK CURRENT SENSE SOFTSTART + SLOPE COMP LOGIC LX OUT CONTROL BIAS PWM EAMP FB FB COMP V/RESET GND MAX25231ATCD PGOOD www.maximintegrated.com Maxim Integrated 2