Low-Voltage Synchronous Boost Converter

The MAX20471, MAX20472, and MAX20472B are high-efficiency low-voltage DC-DC converters that boost a 3.0V to 4.0V input supply to between 3.8V and 5.25V (factory-configurable) at 500mA or 1A. The boost converters achieve ±1.5% output error over load, line, and temperature range.

The devices feature a 2.2MHz (2.0MHz for MAX20472B) fixed-frequency PWM mode for better noise immunity and load-transient response, and a pulse-frequency modulation mode (skip) for increased efficiency during light-load operation. The 2.2MHz/2.0MHz frequency operation allows for the use of all ceramic capacitors and minimizes external components. The programmable spread-spectrum frequency modulation minimizes radiated electromagnetic emissions. Integrated low RDS(ON) switches improve efficiency at heavy loads, which make the layout a much simpler task with respect to discrete solutions.

Other features include true shutdown, soft-start, overcurrent, and overtemperature protections.

Applications

* Automotive CAN Transceivers * Automotive Point of Load

* Multiple Functions for Small Size

* Synchronous Boost Converter

* 3.8V to 5.25V Output in 50mV Steps * 500mA and 1AOutput Versions

* 3V to 4V Operating Supply Voltage

* True Output Shutdown

* 2.2MHz Operation for the MAX20471, MAX20472

* 2.0MHz Operation for the MAX20472B

* Open-Drain Reset Output Pin (Active-Low RESET)

* Spread-Spectrum Enable Pin (SSEN)

* High Precision

* ±1.5% Output-Voltage Accuracy

* 93V ±2% Undervoltage Monitoring

* 107V ±2% Overvoltage Monitoring

* Good Load-Transient Performance

* Robust for the Automotive Environment

* Current-Mode, Forced-PWM, and Skip Operation

* Overtemperature and Short-Circuit Protection

* 12-Pin (3mm × 3mm) TDFN

* 12-Pin (3mm × 3mm) SWTDFN

* 8-Pin (0.150”) SOIC (MAX20471 Only)

* -40°C to +125°C Automotive Temperature Range