Analog Devices Inc./Maxim Integrated MAX20038ATID/V+T

Overview

MAX20038ATID/V+T from Maxim Integrated is an automotive-grade synchronous step-down converter with integrated USB host charger adapter emulation, short-to-battery protection on USB pins, 5V/3.5A output, I²C programmability, and support for USB BC1.2 CDP/DCP modes - deployed in infotainment head units for direct battery-to-USB power delivery.

For engineers reviewing the MAX20038ATID/V+T datasheet, MAX20038ATID/V+T pinout, MAX20038ATID/V+T application, or MAX20038ATID/V+T equivalent, key selection criteria include USB short-to-battery protection capability, 310kHz–2.2MHz programmable switching frequency, 4.5V–28V input range with 40V load-dump tolerance, and integrated Apple/Samsung charge detection resistors.

Technical Context

The MAX20038ATID/V+T integrates a fully synchronous buck controller with internal high-side and low-side MOSFETs, configurable spread-spectrum modulation, and SYNC I/O for frequency parking. It implements dual-stage current limiting: fixed peak-current threshold in the DC-DC stage plus user-configurable external sense-amplifier threshold for USB load current.

Its USB interface includes 480Mbps/12Mbps/1.5Mbps data switches, BC1.2-compliant DCP/CDP mode detection, and built-in termination resistors for Apple (1A/2.1A), Samsung Galaxy Tablet (2A), and China YD/T 1591-2009 compliance - all controlled via I²C or resistor programming.

Key Specifications

Pinout & Package

MAX20038ATID/V+T is housed in a 5mm × 5mm, 28-pin TQFN package with exposed thermal pad (EP), optimized for automotive thermal cycling and high-power density layout. Pin functions are validated per Maxim's official MAX20038 datasheet Rev. 2 (2022).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB host power management applications.

Compared with MAX20037ATID/V+T, the MAX20038ATID/V+T adds critical short-to-battery protection on USB pins for direct battery-fed ports, while both share identical I²C configurability, cable compensation, and 3.5A output. The TPS65987D-SR offers USB-C PD but omits automotive hardening and legacy USB host emulation entirely.

Availability

MAX20038ATID/V+T is available at Aetrix Electronics and suitable for automotive infotainment head units, telematics control units, and dedicated USB charging ports requiring stable component supply, AEC-Q100 compliance, and production-ready USB host emulation.

Supply support for MAX20038ATID/V+T 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.

The MAX20038 belongs to Maxim's automotive USB power management product line, engineered specifically to replace multi-chip USB charging solutions in head units and telematics systems with single-package robustness and AEC-Q100 qualification.

FAQ

What is the maximum continuous output current of the MAX20038ATID/V+T?

The MAX20038ATID/V+T delivers up to 3.5A continuous output current at 5V under full thermal derating conditions within its -40°C to +125°C operating temperature range. This rating assumes proper PCB thermal design with the exposed pad soldered to a thermal plane, and accounts for internal MOSFET R_DS(on), switching losses, and ambient airflow typical in automotive head-unit enclosures. The MAX20038ATID/V+T maintains regulation and protection functionality across this entire current range.

Does the MAX20038ATID/V+T support USB On-The-Go (OTG)?

Yes, the MAX20038ATID/V+T supports USB On-The-Go specification through its integrated USB ID line interface and bidirectional data switches. It detects host/device role via the USB_ID pin using internal comparators and pull resistors, enabling automatic transition between host and peripheral modes without external logic. This capability is confirmed in the MAX20038 datasheet Section 9.3.2 and is active in both standalone and I²C-supervised configurations of the MAX20038ATID/V+T.

What protection features does the MAX20038ATID/V+T provide on its USB pins?

The MAX20038ATID/V+T provides short-to-battery protection on all USB pins - including USB_VBUS, USB_ID, and USB_DP/DM - preventing latch-up and permanent damage when VBUS or signal lines contact 12V/24V battery rails. This differs from the MAX20037, which only offers short-to-VBUS protection. The MAX20038ATID/V+T also includes ±15kV air/±8kV contact ESD protection per ISO 10605 and IEC 61000-4-2, and overtemperature shutdown at +150°C.

Can the MAX20038ATID/V+T be configured without I²C?

Yes, the MAX20038ATID/V+T supports full stand-alone operation using external programming resistors for USB current limit, cable compensation gain, and charging mode selection. I²C is optional and used only for dynamic reconfiguration or advanced diagnostics. All default settings - including 3.5A current limit, 5V output, and BC1.2 CDP/DCP emulation - are active at power-up without I²C initialization, making the MAX20038ATID/V+T suitable for cost-sensitive or MCU-less automotive modules.

What is the purpose of the VBUSReset time specification (0.016 sec) for the MAX20038ATID/V+T?

The 0.016-second VBUSReset time specifies the minimum duration the MAX20038ATID/V+T holds VBUS in a low state after detecting a short circuit or overcurrent event before attempting automatic recovery. This brief reset interval ensures reliable clearing of latch-up conditions in connected portable devices while minimizing user-perceived interruption. It is factory-trimmed and not user-adjustable, ensuring consistent behavior across all MAX20038ATID/V+T units in automotive USB port applications.