Analog Devices Inc./Maxim Integrated MAX20037ATIA/V+

Overview

MAX20037ATIA/V+ from Maxim Integrated is an automotive-grade synchronous step-down converter with integrated USB host charger emulator, USB protection switches, and current-sense amplifier-designed for 4.5V–28V input, 5V/3.5A output, and USB BC1.2 CDP/DCP compliance in vehicle infotainment and center-console USB ports.

For engineers reviewing the MAX20037ATIA/V+ datasheet, MAX20037ATIA/V+ pinout, MAX20037ATIA/V+ application, or MAX20037ATIA/V+ equivalent, key selection considerations include programmable switching frequency (310kHz–2.2MHz), USB cable-drop compensation up to 600mΩ, ±15kV ISO 10605 ESD rating, and I²C-configurable USB current limit and charging mode emulation.

Technical Context

The MAX20037ATIA/V+ integrates a fully synchronous buck controller with internal high-side and low-side MOSFETs, supporting spread-spectrum modulation and external SYNC for EMI control. It implements dual-stage USB current limiting: fixed peak-current threshold in DC-DC stage plus user-configurable external sense-amplifier threshold.

Its USB interface includes hardware-based BC1.2 CDP/DCP detection, integrated Apple/Samsung termination resistors, and 480Mbps data switch support-while the feedback-adjustment circuit dynamically compensates VBUS for voltage drop across captive cables up to 600mΩ resistance.

Key Specifications

Pinout & Package

MAX20037ATIA/V+ is housed in a 5mm × 5mm, 28-pin TQFN package with exposed thermal pad (EP), optimized for high-power density and thermal performance in space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB host adapter emulator applications.

Compared with MAX20038ATIA/V+, the MAX20037ATIA/V+ provides superior fault resilience for USB lines routed near battery rails, while versus TPS65987D-based solutions it delivers lower BOM cost, smaller footprint, and guaranteed BC1.2 compliance without firmware development.

Availability

MAX20037ATIA/V+ is available at Aetrix Electronics and suitable for automotive infotainment systems, center-console USB charging modules, and telematics control units requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for MAX20037ATIA/V+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets-with emphasis on high-reliability, low-noise, and AEC-Q100-qualified solutions.

The MAX20037ATIA/V+ belongs to Maxim's automotive USB power and interface product line, engineered specifically to replace multi-chip USB host implementations in vehicles with a single AEC-Q100 Grade-1 qualified IC that meets OEM ESD, EMC, and thermal requirements.

FAQ

What USB charging standards does the MAX20037ATIA/V+ support?

The MAX20037ATIA/V+ supports USB Battery Charging Specification Rev 1.2-including CDP (Charging Downstream Port) and DCP (Dedicated Charger Port) modes-as well as China YD/T 1591-2009, Apple 1A/2.1A, and Samsung Galaxy Tablet 2A profiles. It implements hardware-based detection and termination, eliminating dependency on external firmware for BC1.2 compliance. The MAX20037ATIA/V+ also supports USB On-the-Go and maintains 480Mbps data integrity.

Does the MAX20037ATIA/V+ require external programming resistors or can it be configured solely via I²C?

The MAX20037ATIA/V+ supports both configuration methods: critical parameters like switching frequency and USB current limit can be set either by external resistors or through its I²C interface (address 0x2C). This dual-mode flexibility allows for factory-programmed defaults using resistors while retaining field-upgradable behavior via I²C registers-enabling design reuse across multiple vehicle platforms without hardware changes. The MAX20037ATIA/V+ retains configuration after power cycle when I²C writes are performed.

How does the MAX20037ATIA/V+ compensate for voltage drop across long USB cables?

The MAX20037ATIA/V+ includes a configurable feedback-adjustment circuit that applies programmable gain to offset VBUS voltage drop caused by cable resistance-supporting compensation up to 600mΩ. This is implemented via external resistor dividers on the VFB_ADJ pin, allowing precise calibration for specific cable lengths and gauges. Unlike open-loop solutions, this closed-loop method ensures 5V regulation is maintained at the downstream device connector-not just at the IC output-making the MAX20037ATIA/V+ ideal for automotive captive-cable applications.

What protection features are unique to the MAX20037ATIA/V+ compared to other USB power switches?

The MAX20037ATIA/V+ uniquely integrates short-to-battery protection on its USB pins-a feature absent in most USB power switches and even in its sibling MAX20038ATIA/V+. This allows safe operation when USB data lines may be accidentally shorted to 12V/24V battery rails in automotive wiring harnesses. Combined with ±15kV ISO 10605 ESD rating and overtemperature shutdown, this makes the MAX20037ATIA/V+ especially suited for harsh vehicle environments where physical routing constraints increase fault risk.

Is the MAX20037ATIA/V+ pin-compatible with other devices in the MAX20037/MAX20038 family?

Yes-the MAX20037ATIA/V+ shares identical pinout, package (28-pin TQFN, 5mm × 5mm), and footprint with all variants in the MAX20037/MAX20038 family, including MAX20037ATIB/V+, MAX20038ATIA/V+, and MAX20038ATIB/V+. This enables direct substitution during design-in or qualification without PCB layout changes. However, functional differences-such as USB pin protection type (short-to-battery vs. short-to-VBUS)-must be verified against system-level fault requirements before replacement.