Analog Devices Inc. MAX20471/MAX20472/B Low-Voltage Synchronous Boost Converters boost a 3.0V to 4.0V input supply to between 3.8V and 5.25V (factory configurable) at 500mA, 1A, or 2A. The boost converters achieve ±1.5% output error overload, line, and temperature ranges. The ICs feature a 2.2MHz fixed-frequency, forced pulse-width modulation (FPWM) mode for better noise immunity and load-transient response. It also has a pulse-frequency modulation (skip) mode for increased efficiency during light-load operation. The 2.2MHz frequency operation enables 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, making the layout much simpler than discrete solutions. Other features of the parts include true output shutdown, soft-start ramping, overcurrent limiting, and overtemperature protection.
