MAX20419 Datasheet

• Multiple Functions for Small Size
  • Synchronous 750mA Boost Converter
  • Fixed at 5V Output
  • Dual Synchronous Buck Converters up to 3.6A
    • Factory Configurable from 0.8V to 3.8V in 25mV Steps
  • Programmable Windowed Watchdog
  • 3.0V to 5.5V Operating Supply Voltage
  • 2.2MHz Operation
  • Individual RESET_ Outputs
  • High-Precision Performance
    • ±1.9% Output-Voltage Accuracy (OUT1) and ±1.4% Output-Voltage Accuracy (OUT2, OUT3)
    • ±1.3% OV/UV Monitoring (OUT1–OUT3, PV)
    • Excellent Load-Transient Performance
• Diagnostics and Redundant Circuits 
  • ASIL C Compliant
  • Redundant Reference
  • Fail Safe on Open Pins
  • Shorted Pin Detection on RESET1–RESET3
  • Input Overvoltage Detection
• Robust for the Automotive Environment
  • Current Mode, Forced-PWM, and Skip Operation
  • Overtemperature and Short-Circuit Protection
  • 24-Pin (4mm x 4mm) TQFN with Exposed Pad
  • -40°C to +125°C Automotive Temperature Range

• ADAS
• Infotainment
• SOC Power

The MAX20419 is a high-efficiency, 3-output, low-voltage DC-DC converter IC. OUT1 boosts the input supply to 5V at up to 750mA, while two synchronous step-down converters operate from a 3.0V to 5.5V input voltage range and provide a 0.8V to 3.8V output voltage range at up to 3.6A. The boost converter achieves ±1.9% and the buck converters achieve ±1.4% output error over load, line, and temperature range. The IC features a 2.2MHz fixed-frequency pulse-width modulation (PWM) mode for better noise immunity and load-transient response, and a pulse-frequency-modulation mode (skip) for increased efficiency during light-load operation. The 2.2MHz frequency operation allows the use of all-ceramic capacitors and minimizes external components. The programmable spread-spectrum frequency modulation minimizes radiated electromagnetic emissions. Integrated low R_DS(ON) switches improve efficiency at heavy loads, and make the layout a much simpler task with respect to discrete solutions.

The IC is offered with factory-preset output voltages (see the Ordering Information/Selector Guide for available options). Other features include soft-start, overcurrent, and overtemperature protections. The MAX20419 also has several redundancy and diagnostic features for compatibility with ASIL-rated applications.