MAX25249B

Quad Output Mini PMIC for Automotive Camera Applications

Industry's Smallest Power solution for Automotive Cameras with Precision Monitoring


Please check latest availability status for a specific part variant.

Description

The MAX25249/MAX25249B are high-efficiency, four-output PMICs that integrate three DC-DC converters and a high-PSRR LDO, with OV/UV monitoring on all outputs. OUT1 is a 1A high-voltage synchronous step-down converter operating from power over coax or car battery. OUT2 and OUT3 low-voltage synchronous step-down converters operate from OUT1 and provide a 0.8V to 3.9875V output voltage range. OUT2 can deliver 1.2A for high-megapixel cameras and high-speed serializers. OUT3 delivers 0.5A to power the secondary rails of the imager, serializer, and MCU. 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 with ±1.3% accuracy around the set voltage, and errors are communicated through active-low RESET.

The devices feature a 2.2MHz fixed-frequency PWM mode for better noise immunity and load-transient response. The high-frequency operation allows for 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 and make layout simpler than discrete solutions.

Sequencing through the use of EN23 and EN4 pins and factory-settable output voltages increase flexibility for different image sensors and configurations. Other features include soft-start, overcurrent, and overtemperature protections. The MAX25249/MAX25249B are compliant to ASIL-B ratings and are specified for operation over the -40°C to +125°C automotive temperature range.

Key Features

  • Multiple Functions for Small Size
    • 1A Synchronous High-Voltage Buck Converter
      • Input Voltage Range 4.5V to 36V
      • 3V to 4V 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
    • Active-Low RESET Output – Push-Pull or Open-Drain
  • High-Precision
    • ±1.5% Output Voltage Accuracy
    • ±1.3% OV/UV Monitoring Accuracy
  • Diagnostics and Features
    • ASIL-B Compliant
    • Redundant Reference
  • 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/Uses

  • Front/Rear/Surround View Camera
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesVIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Max. IOUT
(A)
Max. IOUT
(A)
Oper. Freq.
(kHz)
Package/Pins
minmaxminmax
MAX25249B Step-Down
Output OVP
Output UVP
Reset Output
Shutdown
Avg. Current Mode Control
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
4.5360.83.987511.22200
TQFN-CU/20
See All Multifunction PMICs (85)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX25249BEVKIT: Evaluation Kit for the MAX25249/MAX25249B
MAX25249EVKIT: Evaluation Kit for the MAX25249/MAX25249B

Quality and Environmental Data

Request Reliability Report for: MAX25249B 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources


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