The MAX16984 evaluation kit (EV kit) demonstrates the
MAX16984 automotive high-current step-down converter
with USB protection/host charger adapter emulator.
The device features integrated host-charger port-detection
circuitry adhering to the USB 2.0 BC1.2 battery charging
specification and also features circuitry for Apple® iPod®/
iPhone® 1.0A and iPad® 2.1A dedicated charging modes.
The device integrates high-side current sensing and
voltage-adjustment circuitry that provides automatic USB
voltage adjustment to compensate for voltage drops in
captive cables associated with automotive applications.
The device’s step-down DC-DC converter operates from
a voltage of up to 28V continuous and is protected from
load-dump transients up to 42V. The converter is resistorprogrammable
for 220kHz to 2.2MHz frequencies and can deliver 2.1A continuously.
The EV kit is configured for 2.2MHz operation, and the
included 3-meter USB cable allows for demonstration
of the cable-compensation capability of the device. This
EV kit has been tuned for optimal eye quality at the
end of the supplied USB cable; this tuning method is
referred to as far-eye tuning. The USB 2.0 Hi-Speed eye
diagram for this EV kit is shown in Figure 1.
The EV kit serves as a basic reference diagram for
designs using the MAX16984. Component selection
and layout should be closely followed to ensure optimal
application performance. For additional support or design
assistance, contact factory.
Applications
- Automotive Connectivity
- Automotive Radio and Navigation
- Dedicated USB Power Charger
- Telematics
- USB Port for Host and Hub Applications
