Click here to ask about the production status of specific part numbers. MAX20471, MAX20472, Low Voltage Synchronous Boost Converter MAX20472B General Description Benefits and Features The MAX20471, MAX20472, and MAX20472B are high- Multiple Functions for Small Size efficiency low-voltage DC-DC converters that boost a 3.0V Synchronous Boost Converter to 4.0V input supply to between 3.8V and 5.25V (factory- 3.8V to 5.25V Factory-Preset Output in 50mV configurable) at 500mA or 1A. The boost converters Steps achieve 1.5% output error over load, line, and tempera- 500mA and 1A Options ture range. 3V to 4V Operating Supply Voltage True Output Shutdown The devices feature a 2.2MHz (2.0MHz for MAX20472B) 2.2MHz Operation for the MAX20471, MAX20472 fixed-frequency PWM mode for better noise immunity and 2.0MHz Operation for the MAX20472B load-transient response, and a pulse-frequency modula- Open-Drain Reset Output Pin (RESET) tion mode (skip) for increased efficiency during light-load Spread-Spectrum Enable Pin (SSEN) operation. The 2.2MHz/2.0MHz frequency operation al- lows for the use of all ceramic capacitors and minimizes High-Precision external components. The programmable spread-spec- 1.5% Output Voltage Accuracy trum frequency modulation minimizes radiated electro- 93 2% UV Monitoring magnetic emissions. Integrated low-R switches im- 107 2% OV Monitoring DSON prove efficiency at heavy loads and make the layout a Good Load-Transient Performance much simpler task with respect to discrete solutions. Robust for the Automotive Environment Other features include true shutdown, soft-start, overcur- Current-Mode, Forced-PWM and SKIP Operation rent, and overtemperature protections. Overtemperature and Short-Circuit Protection 12-Pin (3mm x 3mm) TDFN 12-Pin (3mm x 3mm) SWTDFN Applications 8-Pin (0.150 ) SOIC (MAX20471 Only) Automotive Point of Load -40C to +125C Automotive Temperature Range Automotive CAN Transceivers Ordering Information appears at end of data sheet. Simplified Block Diagram 3.3V 2.2F 1H LX 3.3V 5V AV OUT 1F 22F GND PGND MAX20471 MAX20472/B EN SYNC 50K SSEN RESET 19-100163 Rev 13 9/21MAX20471, MAX20472, Low Voltage Synchronous Boost Converter MAX20472B TABLE OF CONTENTS General Description 1 Applications 1 Benefits and Features 1 Simplified Block Diagram . 1 Absolute Maximum Ratings 3 Package Information . 3 12 TDFN 3 12 SWTDFN . 3 8 SOIC . 3 Electrical Characteristics . 4 Typical Operating Characteristics 6 Pin Configurations . 7 MAX20471/MAX20472/MAX20472B 7 MAX20471 7 Pin Description . 7 Functional Diagrams . 9 Diagram 1 . 9 Detailed Description 10 Enable Input (EN) 10 RESET Output 10 Internal Oscillator 10 Synchronization (SYNC) 10 Soft-Start 10 Current-Limit/Short-Circuit Protection 11 PWM/SKIP Modes . 11 Overtemperature Protection 11 Boost Converter Short Protection 11 Startup into Short 11 Short or Overload after Soft-Start 11 Applications Information . 12 Input Capacitor 12 Inductor Selection 12 Boost Output Capacitor . 12 PCB Layout Guidelines . 12 Typical Application Circuits . 12 Circuit 1 . 12 Ordering Information 13 Revision History . 14 www.maximintegrated.com Maxim Integrated 2