The MAX20049 is a dual step-down converter IC with two
low-dropout regulators (LDOs), providing a single-chip
solution for automotive cameras. The two step-down converters
are designed for fixed-frequency PWM operation
with input voltages from 5V to 17V for MAX20049, 4V to
17V for MAX20049C, and 3.5V to 17V for MAX20049D.
The dedicated high-voltage inputs allow for a flexible solution.
The IC provides voltage monitoring on all four output rails.
Once an overvoltage or undervoltage is detected,
power good gets pulled low. To accommodate long and
inexpensive coax cables, the device has a 500mV SUP1
hysteresis. Both bucks offer very low on-time and allow
operation from 17V input to 0.9V output. High-frequency
operation allows for an all-ceramic capacitor design and
small-size external components. The low-resistance on-chip
switches ensure high efficiency while minimizing
critical inductances.
Output voltages are factory set and cover various sensor imagers
needing 3.3V, 3.0V, 2.9V, 2.8V, or 2.7V. The secondary
supplies cover the typical 1.8V, 1.2V, 1.1V, and < 1.0V rails
for the serializer and memory. The Output-Voltage Selection
section covers all the voltage options for flexibility in the
camera design.
Protection features include cycle-by-cycle current limit,
and thermal shutdown with automatic recovery. The buck
converters operate 180° out-of-phase from each other to
minimize input current ripple.
Design Solution: Make Your ADAS High-Resolution Remote Camera Design Smaller and Flexible ›
Drive Higher Performance for Your Tiny Vehicle Camera Modules
Applications
- Camera Module — Surround, Rear, Front
- Point of Load
