Analog Devices / Maxim Integrated MAX20037/38 Automotive Step-Down Converters
Analog Devices Inc. MAX20037/38 Automotive High-Current Step-Down Converters with USB Protection/Host Charger Adapter Emulation combine a 3.5A automotive-grade step-down converter, USB host charger adapter emulator, and USB protection switches for automotive USB host applications. The MAX20037/38 Converters include a USB load current-sense amplifier and configurable feedback-adjustment circuit designed to provide automatic USB voltage compensation for voltage drops in captive cables often found in automotive applications. The devices limit the USB load current using a fixed internal peak-current threshold of the DC-DC converter and a user-configurable external USB load current-sense amplifier threshold.
The MAX20037/38 Automotive High-Current Step-Down Converters allow flexible configuration options for both stand-alone and supervised applications and can be programmed for desired operation using external programming resistors and/or internal I2C registers through the I2C bus.
The ADI MAX20037/38 Automotive Step-Down Converters are optimized for high-frequency operation and include programmable frequency selection from 310kHz to 2.2MHz, allowing optimization of efficiency, noise, and board space based on application requirements. The fully synchronous DC-DC converters feature integrated high-side and low-side MOSFETs, an external SYNC input/output, and can be configured for spread-spectrum operation. The MAX20037/MAX20038 is available in a small (5mm x 5mm) 28-pin TQFN package (side-wettable available) designed to minimize required components and layout area.
Features
- One-chip solution directly from car battery to portable device
- 4.5V to 28V (40V load dump) input voltage
- 5V, 3.5A output current capability
- Device-attach detection output
- Low-Q current skip and shutdown modes
- Optimal USB power and communication for portable devices
- User-Programmable voltage gain adjusts output for up to 600mΩ cable resistance
- User-Programmable USB current Limit
- USB 480Mbps/12Mbps/1.5Mbps data switches
- Integrated iPod®/iPhone®/iPad® and Samsung® charge-detection termination resistors
- Supports USB BC1.2 CDP and DCP modes
- Supports China YD/T 1591-2009
- Compatible with USB on-the-go specification
- Low-noise features prevent interference with AM band and portable devices
- Fixed-Frequency 275kHz to 2.2MHz operation
- Fixed-PWM option at no load
- Spread spectrum for EMI reduction
- SYNC input/output for frequency parking
- Robust design keeps vehicle systems and portable devices safe in the automotive environment
- Short-to-Battery protection on DC-DC converter pins
- Short-to-VBUS protection on USB Pins (MAX20037)
- Short-to-Battery protection on USB Pins (MAX20038)
- ±15kV Air/±8kV contact ISO 10605
- ±15kV Air/±8kV contact IEC 61000-4-2
- Reduced inrush current with soft-start
- Overtemperature protection
- -40°C to +125°C operating temperature range
Evaluation Kit
Analog Devices / Maxim Integrated MAX20037EVKIT/MAX20038EVKIT Evaluation Kits
Demonstrates the MAX20037/38 Automotive Step-Down Converters.