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The MAX25249BATPA/VY is a high-efficiency, four-output PMIC that integrates three DC-DC converters and one high-PSRR LDO, all with OV/UV monitoring.OUT1 is a 1A, high-voltage, synchronous buck converter that is powered by a coaxial cable supply or an automotive battery.OUT2 and OUT3 are low-voltage, synchronous buck converters that are powered by a coaxial cable supply or an automotive battery. OUT1 is the power supply, providing a range of output voltages from 0.8 V to 3.9875 V. OUT2 delivers 1.2 A of current and is suitable for megapixel cameras and high-speed serialisers. OUT3 delivers 0.5 A of current and powers the auxiliary power rails of the imagers, serial converters, and MCUs. OUT4 is a low-voltage, low-noise, high-PSRR LDO suitable for imager power supplies. All buck converters achieve ±1.5% output voltage accuracy over the entire load, supply, and temperature range. Over- and under-voltage faults are monitored with ±1.3% accuracy near set voltage, with errors indicated by a low-level active RESET.

The device features a 2.2MHz fixed frequency PWM mode for better noise immunity and load transient response. The high operating frequency allows the use of full ceramic capacitors to minimise external components. Programmable spread spectrum modulation minimises electromagnetic emissions. Integrated low-RDS(ON) switch greatly improves efficiency at heavy loads and simplifies circuit layout compared to discrete solutions.

Features

Compact size combines multiple functions

1A synchronous high-voltage buck converter

Input voltage range: 5V to 36V

3V to 4V and 5V output voltages in 50mV steps

Two synchronous low-voltage buck converters

OUT2 and OUT3 provide up to 1.2A of current

0.8V to 3.9875V in 12.5mV steps

LDO for camera sensor; 50dB (at 1kHz)

2.2MHz operating frequency

Active low RESET output-push-pull or open-drain

High Accuracy

Output voltage accuracy: ±1.5 per cent

±1.3% OV/UV monitoring accuracy

Diagnostics and Characteristics

Meets ASIL B standard requirements

Redundant reference voltage sources

Stable performance for automotive environments

Current mode, forced PWM operation

Over temperature and short circuit protection

3.5mm x 3.5mm 20-pin TQFN

-40°C to +125°C temperature range for Class 1 automotive applications

AEC-Q100 certified

Applications

Front/rear/panoramic view cameras

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