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Analog Devices MAX20037 | Demoboard MAX20037
Automotive High-Current Step-Down Converter with USB Protection/Host Charger Adapter Emulation
Overview
| Topology | Buck Converter |
| Switching frequency | 275-2200 kHz |
Description
The MAX20037 evaluation kit (EV kit) demonstrates theMAX20037 automotive high-current step-down DC-DC converter with USB protection/host charger adapteremulation.The IC features integrated host-charger portdetectioncircuitry adhering to the USB-IF BC1.2 batterychargingspecification, Apple® iPod®/iPhone®/iPad® and Samsung® charge-detection termination resistors, and Chinese Telecommunication Industry Standard YD/T1591-2009.The IC 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 high-efficiency, step-down, synchronous, DC-DC converter operates from a voltage up to 28V and is protected from load-dump transients up to 40V. The converter is programmable for frequencies from 275kHz to 2.2MHz and can deliver 3A of continuous current at 105°C.The EV kit is populated with an I2C-enabled MAX20037.The I2C interface allows for flexible configuration, detailed fault diagnostics, and access to the on-chip ADC that reports output voltage and current. The I2C features are easily accessed by using the Maxim command module (MINIQUSB) along with the provided example GUI.The EV kit is configured for 2.2MHz operation, and the included 3m USB cable allows for demonstration of the cable-compensation capability of the IC. The EV kit comes with data-line tuning component pads populated with short circuits. Tuning components are usually not necessary for the low voltage, high-bandwidth data switches in MAX20037. Refer to Figure 17 in the MAX20037/MAX20038 IC data sheet for the MAX20037 untuned near-eye diagram.
Features
- Configurable Charge-Detection Modes
- USB-IF BC1.2 CDP, DCP
- Apple 2.4A, 1.0A
- China YD/T1591-2009 Charging Specification
- Automatic USB Voltage Adjustment by IntegratedDC-DC Converter (275kHz to 2.2MHz)
- Proven PCB Layout
- Fully Assembled and Tested
Typical applications
- automotive-grade step-down converter, USB host charger adapter emulator, and USB protection switches for automotive USB host applications
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | IR(mA) | Z @ 1 GHz(Ω) | H(mm) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-CBF SMT EMI Suppression Ferrite Bead, 600 Ω, 700 Ω | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | Impedance @ 100 MHz600 Ω | Maximum Impedance700 Ω | Maximum Impedance90 MHz | Rated Current 22000 mA | DC Resistance0.1 Ω | TypeHigh Current | Rated Current1200 mA | Impedance @ 1 GHz131 Ω | Height1.1 mm | ||||
 | WE-MPSB EMI Multilayer Power Suppression Bead, 600 Ω, 610 Ω | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | Impedance @ 100 MHz600 Ω | Maximum Impedance610 Ω | Maximum Impedance83 MHz | Rated Current 22500 mA | DC Resistance0.05 Ω | TypeHigh Current | Rated Current2500 mA | Impedance @ 1 GHz84 Ω | Height1.1 mm |