3.2MHz, 500mA Dual Step-Down Converters for Automotive Cameras

MAX20019/MAX20020 are 2.2MHz and 3.2MHz dual step-down converters with integrated high-side and low-side MOSFETs. The high-voltage step-down converter is designed for continuous operation up to 17V input voltages. The output voltage is factory preset. Buck 1 is preset to 3.3V, 3.0V, or 2.8V. Buck 2 is preset to 1.8V, 1.5V, 1.2V, or 1V. Another option is Buck 1 preset to 5V and Buck 2 preset to 3.3V.

The low-voltage buck features fixed-frequency PWM- mode operation with a switching frequency of 2.2MHz or 3.2MHz. 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 inductance. A 500mV enable hysteresis on the MAX20019 allows the use of long, low-cost coax cables, even during slow startup situations. The MAX20020’s Buck 1 starts after VSUP is greater than 5.5V and Buck 1 is driven by the EN input.

Protection features include overvoltage (OV) protection, 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.

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Applications

* Automotive Point-of-Load * Surround-View Camera Power Supplies

* Small Solution Size

* 2mm x 3mm x 0.75mm 10-pin TDFN with an Exposed Pad

* 2.2MHz and 3.2MHz Operation Allows Smaller System Size

* No External Components Needed for Soft-Start

* Cable Flexibility

* 500mV Enable Hysteresis Allows for Long, Low-Cost Cables During Slow Starts

* EMI Solutions

* Optional Spread-Spectrum Frequency Modulation

* Pinout Placement Allows for Tight PCB Layout of Switching Nodes

* Self-Protected

* Overvoltage Protection, Thermal Shutdown, Short-Circuit Protection

* Automotive Ready

* Wide 3.5V to 17V Input Voltage Range for Power-Over-Coax

* Automotive Temperature Range -40°C to +125°C

* AEC-Q100 Qualified