Click here for production status of specific part numbers. Evaluates: MAX20459 MAX20459 Evaluation Kit General Description Quick Start (Stand-Alone Variant) The MAX20459 evaluation kit (EV kit) demonstrates the The following procedure demonstrates the MAX20459s MAX20459 automotive high-current, high-efficiency, step- auto-DCP function in standalone mode. down DC-DC converter with integrated USB Type-C DFP Required Equipment controller and host-charger-adapter emulation, which MAX20459 EV kit provides ESD and short-to-battery protection. USB Type-C to Type-C cable The MAX20459 features integrated host-charger port- detection circuitry adhering to the USB Type-C specifica- 14V/2A DC Power Supply or car battery (VBAT) tion, the USB-IF BC1.2 battery charging specification, USB-C amperage meter (Plugable USBC-VAMETER Apple iPod/iPhone/iPad and Samsung charge-detec- recommended) tion termination resistors, and Chinese Telecommunication USB-C device (smartphone recommended) Industry Standard YD/T 1591-2009. Two jumpers: V , GND BAT The MAX20459 step-down, synchronous, DC-DC con- verter operates from a voltage of up to 28V continuous Initial Setup and protects against load-dump transients up to 40V. The The EV kit is fully assembled and tested. Follow the steps converter is programmable for frequencies from 275kHz below to set up the board for evaluation. to 2.2MHz and can deliver 3A continuously. 1) Verify SW1 switch is set to HVEN = 1, ENBUCK = 1, The MAX20459 integrates thermal management in a two- SYNC = 0, DCP MODE = 0. stage approach to limit maximum die temperature. In the 2) Set the V power supply to 14V output, 2A first stage, the standalone variant reduces the Type-C BAT current limit. Turn the output off. Connect the nega - handshake and DC current limit by one step when die tive lead to the GND test loop on EVKIT. Connect temperature exceeds 130C (typ). The second stage trig- positive lead to the VBAT FLT test loop on EVKIT. gers DC-DC shutdown if the die temperature continues rising and exceeds 165C (typ). 3) Turn the V power supply output on. BAT The EV kit is populated with a standalone enabled 4) Plug the USB-C amperage meter into the EVKIT. MAX20459ATJC/V+ that is configured by pull-down resis- 5) Plug the USB-C to USB-C cable into the USB-C 2 tors. The I C variant (MAX20459ATJA/V+) allows for flex- amperage meter. ible configuration, detailed fault diagnostics, and access 6) Plug the USB-C cable into a USB Type-C device that to the on-chip ADC that reports die temperature, output can charge (i.e. smartphone). 2 voltage, and output current. The I C features are easily accessed by using the Maxim MINIQUSB module along 7) The no-load USB output voltage should be approxi- with the provided example GUI. mately 5.15V, and the USB device should begin charging. Features and Benefits Configurable Charge-Detection Modes USB-C 3.0A, 1.5A, 0.5A Ordering Information appears at end of data sheet. USB-IF BC1.2 DCP Apple 2.4A, 1.0A Samsung 2.0A China YD/T 1591-2009 Charging Specification Automatic USB Voltage Adjustment by Integrated Apple, iPod, iPhone, and iPad are registered trademarks of DC-DC Converter (275kHz - 2.2MHz) Apple Inc. Proven PCB Layout Samsung is a registered trademark of Samsung Electronics Fully Assembled and Tested Co., Ltd. 319-100459 Rev 1 3/20MAX20459 Evaluation Kit Evaluates: MAX20459 Vbat 14.00V 0.67A 1.67A 5.10V Figure 1. Standalone EV Kit Interface 11) Note that some USB devices are compatible with USB Type-C & Legacy Apple/Samsung/USB multiple handshakes and may prefer one over the DCP Charging other, depending on many factors. The USB charg- 8) The amperage meter should display USB current as ing behavior can also depend on the version of the device charges. software installed on the users device, which may a. Note that for most devices, maximum charging change over time. rate occurs between approximately 20-80% bat- tery level. 2 Quick Start (I C variant) 9) For native USB Type-C devices, maximum charging The following procedure demonstrates the MAX20459s current will follow the Type-C mode setting: 2 auto-DCP mode and I C interface. a. 0.5A/1.5A/3.0A (see CONFIG2 and Required Equipment CONFIG3 Pin Table (Standalone Variant) in the MAX20459 data sheet) MAX20459 EV kit 10) For non-native USB Type-C devices (Apple 30-pin/ USB Type-C to Type-C cable lightning and USB mini/micro-b): 14V/2A DC power supply or car battery (V ) BAT a. Apple devices will consume up to 1A or 2.4A, MINIQUSB and MAX20459 GUI depending on the DCP MODE pin (see Table 3). b. BC 1.2-compatible or Samsung devices will con- USB-C device (smartphone recommended) sume up to 1.5A or 2A, respectively, regardless Two jumpers: V , GND BAT of DCP MODE pin state. 3 DuPont jumper wires female-female: GND, SDA, SCL Maxim Integrated 2 www.maximintegrated.com