Maxim Integrated MAX25250 Four Output Mini PMIC, available now from Mouser, is a high-efficiency, four-output PMIC that combines three DC-DC converters and a high-PSRR LDO designed for camera applications. The device features soft-start, overcurrent, and overtemperature protection.
The OUT1 is a 1A high-voltage synchronous step-down converter running from power over coax or car battery. The OUT2 and OUT3 low-voltage synchronous step-down converters work from OUT1 and provide a 0.8V to 3.9875V output voltage range. The OUT2 provides 1.2A for high megapixel cameras and high-speed serialisers. The OUT3 delivers 1.2A to power the secondary rails of the imager, serialiser, and MCU. The OUT4 is a low-voltage, low-noise, high-PSRR LDO for imager power.
All buck converters deliver ±1.5% output voltage accuracy overload, line, and temperature range. Overvoltage and Undervoltage faults are monitored, and errors are reported through the RESET.
The PMIC features a 2.2MHz fixed-frequency PWM mode for better noise immunity and load-transient response. The high-frequency operation of the device provides for the use of all-ceramic capacitors and decreases external components. The programmable spread-spectrum frequency modulation minimises radiated electromagnetic emissions. Also, the integrated low-RDS(ON) switches increase efficiency at heavy loads and make layout simpler than discrete solutions.
The PMIC is specified for operation over the -40C to +125C automotive temperature range. The device is ideal for surround-view cameras and rear-view cameras.