Analog Devices / Maxim Integrated MAX25250 Four Output Mini PMIC
Analog Devices Inc. MAX25250 Four Output Mini PMIC is a high-efficiency, four-output PMIC that integrates three DC-DC converters and a high-PSRR LDO, intended for camera applications. ADI MAX25250 features soft-start, overcurrent, and overtemperature protection.
The OUT1 is a 1A high-voltage synchronous step-down converter operating from power over coax or car battery. The OUT2 and OUT3 low-voltage synchronous step-down converters operate from OUT1 and provide a 0.8V to 3.9875V output voltage range. The OUT2 delivers 1.2A for high megapixel cameras and high-speed serializers. The OUT3 provides 1.2A to power the secondary rails of the imager, serializer, and MCU. The OUT4 is a low-voltage, low-noise, high-PSRR LDO for imager power.
All buck converters achieve ±1.5% output voltage accuracy over load, line, and temperature range. Overvoltage and Undervoltage faults are monitored, and errors are communicated through the RESET.
The Maxim MAX25250 Four Output Mini PMIC features a 2.2MHz fixed-frequency PWM mode for improved noise immunity and load-transient response. The high-frequency operation of the MAX25250 allows for the use of all-ceramic capacitors and minimizes external components. The programmable spread-spectrum frequency modulation minimizes radiated electromagnetic emissions. Additionally, the integrated low-RDS(ON) switches improve efficiency at heavy loads and make layout simpler than discrete solutions.
The MAX25250 PMIC is specified for operation over the -40°C to +125°C automotive temperature range.
Features
- Multiple functions for small size
- 1A Synchronous high-voltage buck converter
- Input voltage range 5V to 22V
- 3V to 4V, and 5V Output voltage in 50mV steps
- Two synchronous low-voltage buck converters
- OUT2 and OUT3 provide up to 1.2A
- 0.8V to 3.9875V in 12.5mV steps
- LDO for Camera sensor; 50dB at 1kHz
- 2.2MHz Operation
- RESET Output – open-drain
- High-precision
- ±1.5% Output voltage accuracy
- OV/UV Monitoring
- 1A Synchronous high-voltage buck converter
- Robust for the automotive environment
- Current-mode, forced-PWM operation
- Overtemperature and short-circuit protection
- 3.5mm x 3.5mm 20-Pin TQFN
- -40°C to +125°C Grade 1 automotive temperature range
- AEC-Q100 qualified
Applications
- Surround-view cameras
- Rear-view cameras
Simplified Block Diagram
