Five-Output ASIL B PMIC with Accurate Temperature Monitoring for Next-Generation Camera Sensors

The MAX25252 is a high-efficiency, five-output ASIL B PMIC with three DC-DC converters, and two high-PSRR LDOs, with OV/UV monitoring on all outputs. OUT1 is a 1A high-voltage, synchronous step-down converter operating from power over coax. OUT2 and OUT3 are low voltage synchronous step-down converters and provide a 0.75V to 3.9375V output voltage range. OUT2 and OUT3 can deliver up to 1.7A current respectively for the high-megapixel cameras and high-speed serializers. LDO4 and LDO5 deliver up to 0.4A and 0.9A of current to power the secondary rails of the imager and a serializer. All outputs achieve ±1.5% output accuracy over load, line, and temperature range. Overvoltage and undervoltage for each output are monitored and their statuses are communicated through RESET and I2C.

The device features temperature monitoring with external NTC. The IC accurately measures PCB temperature and flags the temperature warning through RESET.

The device features a 2.1MHz fixed-frequency PWM mode for better noise immunity and load transient response. The 2.1MHz frequency operation allows for the use of all ceramic capacitors and minimizes external components. The programmable spread-spectrum frequency modulation minimizes radiated electromagnetic emissions.

The I2C programmable output voltages and sequencing increases flexibility for different image sensors and configurations. Other features include soft-start, overcurrent, and overtemperature protections.

APPLICATIONS

* Surround-View Cameras

* Rear-View Cameras

* Side-View Cameras

* Forward-Looking Cameras

* Multiple Functions for Small Size

* 1A Synchronous High-Voltage Buck Converter

* Input Voltage Range 3.5V to 22V

* 2.5V to 5V Output Voltage in 100mV Steps

* Two Synchronous Low-Voltage Buck Converters

* Delivers up to 1.7A Current

* 0.75V to 3.9375V Output Voltage in 12.5mVSteps

* High-PSRR, Low-Voltage LDO for Camera Sensor

* Delivers up to 0.4A Current

* 0.75V to 3.9375V Output Voltage in 12.5mVSteps

* Low-Voltage LDO

* Delivers up to 0.9A Current

* 0.75V to 3.9375V Output Voltage in 12.5mVSteps

* 2.1MHz Operation

* RESET Output for OV/UV Detection and OtherDiagnostics

* SUP Voltage OV/UV Indication