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Analog Devices Inc./Maxim Integrated MAX20038ATIA/V+
- Part No.:
- MAX20038ATIA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX20038ATIA/V+.pdf
- Description:
- IC REG BUCK 5V 3.5A 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
MAX20038ATIA/V+ from Maxim Integrated is an automotive-grade synchronous step-down converter with integrated USB host charger adapter emulation, USB protection switches, and current-sense amplifier. It delivers 5V/3.5A output from 4.5V–28V input (40V load dump tolerant), supports USB BC1.2 CDP/DCP modes, Apple/Samsung charge detection, and features short-to-battery protection on USB pins. Used in automotive infotainment USB charging ports.
For engineers reviewing the MAX20038ATIA/V+ datasheet, MAX20038ATIA/V+ pinout, MAX20038ATIA/V+ application, or MAX20038ATIA/V+ equivalent, key selection criteria include I²C programmability, 310kHz–2.2MHz switching frequency range, spread-spectrum EMI reduction, USB 480Mbps data switch support, and -40°C to +125°C operation for under-hood deployment.
Technical Context
The MAX20038ATIA/V+ integrates a fully synchronous buck controller with internal high-side and low-side MOSFETs, configurable feedback compensation for captive cable voltage drop (up to 600mΩ), and dual USB data path switches compliant with USB 2.0 high/full/low-speed signaling. Its I²C interface enables dynamic adjustment of output voltage gain, current limit, and charging mode behavior.
Unlike the MAX20037, the MAX20038ATIA/V+ provides short-to-battery protection specifically on USB pins-not short-to-VBUS-and includes factory-configured termination resistors for Apple 1.0A/2.1A and Samsung Galaxy Tablet 2A profiles. It operates across 310kHz–2.2MHz with SYNC I/O and spread-spectrum capability for AM-band noise suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V; withstands 40V load dump transients per ISO 7637-2, enabling direct connection to automotive battery rail. |
| Output Voltage | 5V fixed; regulated with ±1% accuracy over line/load/temperature, supporting USB-compliant VBUS delivery. |
| Max Output Current | 3.5A continuous; delivered via integrated synchronous MOSFETs without external power stage components. |
| Switching Frequency | 310kHz to 2.2MHz; programmable via I²C or external resistor, allowing layout- and noise-optimized frequency selection. |
| USB Data Switches | Two bidirectional 480Mbps-capable switches; support USB 2.0 high-speed, full-speed, and low-speed signaling paths. |
| Operating Temperature | -40°C to +125°C; qualified per AEC-Q100 Grade 1, suitable for under-dash and head-unit mounting locations. |
| ESD Protection | ±15kV air / ±8kV contact per ISO 10605 and IEC 61000-4-2; protects USB data lines against real-world vehicle ESD events. |
Pinout & Package
MAX20038ATIA/V+ is housed in a 5mm × 5mm, 28-pin TQFN package with exposed thermal pad (TQFN-CU/28). Pin assignment is validated per Maxim Integrated's official MAX20038 datasheet Rev. 2 (2018) and MAX20038EVKIT schematic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Accepts 4.5V–28V automotive battery input; connects to bulk capacitor and handles 40V transient surges. |
| VOUT | Regulated output node | Delivers 5V/3.5A to USB VBUS rail; requires local ceramic output capacitance and LC filter for ripple control. |
| SCL, SDA | I²C interface | Enable configuration of USB current limit, voltage gain, charging mode, and fault reporting without external MCU firmware changes. |
| USB_DP, USB_DM | USB 2.0 differential data pair | Pass through high-speed (480Mbps) USB communication; internally switched between host/device roles during CDP emulation. |
| CEN | USB enable control | Active-low signal that powers up/down USB data switches and VBUS discharge path; supports remote wake-up assertion. |
| VBUS_RST | VBUS reset timing output | Open-drain signal with 16ms typical pulse width; used to trigger VBUS reinitialization after overcurrent or short-circuit recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB host emulator | Supports BC1.2 CDP/DCP, Apple 1.0A/2.1A, Samsung Galaxy Tablet 2A, and China YD/T 1591-2009-no external enumeration IC required. |
| Cable voltage drop compensation | Programmable voltage gain (via I²C or resistor) compensates for up to 600mΩ cable resistance, maintaining ≥4.75V at portable device connector. |
| Short-to-battery protected USB pins | USB I/O pins tolerate direct short to battery (12V/24V) without latch-up or damage-critical for automotive harness fault resilience. |
| Synchronous buck with spread spectrum | Reduces peak EMI by >10dB across 150kHz–108MHz band; eliminates need for additional EMI filters in AM radio-sensitive head units. |
| Configurable current limiting | Combines fixed internal peak-current threshold (3.5A) with user-adjustable external sense amplifier threshold for precise USB load management. |
Applications
| Automotive Infotainment Head Unit | Dedicated USB Charging Port (DCP) |
|---|---|
Use Scenario: Integrated into car radio/navigation systems to provide primary USB charging and data connectivity for smartphones and tablets. IC Role / Device Role / Timing Role: Acts as combined DC-DC regulator, USB host emulator, and data switch-replacing discrete buck + USB IC + protection array. Use Value: Eliminates 3–5 external components while meeting AEC-Q100 Grade 1 and ISO 10605 ESD requirements for production head units. | Use Scenario: Deployed in center console or rear-seat USB ports delivering fast, standards-compliant charging without host PC dependency. IC Role / Device Role / Timing Role: Functions as standalone DCP emulator with automatic Apple/Samsung detection and 2A current limit enforcement. Use Value: Delivers certified 2A charging to Samsung Galaxy Tablets and iPhone models without requiring firmware updates or host processor involvement. |
| Telematics Control Unit (TCU) | Automotive USB Hub Interface |
Use Scenario: Powers and enumerates USB modems, GNSS receivers, or OTA update dongles in connected vehicle telematics modules. IC Role / Device Role / Timing Role: Provides robust 5V rail with short-to-battery protected USB I/O and CEN-controlled wake-up for low-power LTE/GNSS sleep states. Use Value: Enables reliable USB peripheral attachment detection and VBUS reset (16ms pulse) during modem reconnection after network loss. | Use Scenario: Serves as upstream port interface in multi-port automotive USB hubs, managing VBUS arbitration and data path routing. IC Role / Device Role / Timing Role: Supplies regulated 5V and switches DP/DM lines between hub controller and downstream devices using internal USB data switches. Use Value: Supports simultaneous high-speed (480Mbps) data transfer and charging via single-chip solution-no external USB transceivers needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive USB host power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20037ATIA/V+ | Provides short-to-VBUS (not short-to-battery) protection on USB pins; lacks factory-programmed Samsung Galaxy Tablet 2A termination. | Targeted at USB host applications where VBUS short faults dominate (e.g., docking stations), not battery-rail shorts. | Select MAX20037ATIA/V+ only if system-level fault analysis confirms VBUS short risk exceeds battery short risk. |
| TPS65987D-SR | USB-C PD controller with integrated buck-boost; supports USB Power Delivery 3.0, not BC1.2 or proprietary Apple/Samsung emulation. | Designed for USB-C port controllers in premium vehicles; requires external 5V buck for legacy USB-A ports. | Choose TPS65987D-SR when upgrading to USB-C PD infrastructure; retain MAX20038ATIA/V+ for cost-optimized USB-A DCP solutions. |
Compared with MAX20037ATIA/V+, the MAX20038ATIA/V+ adds short-to-battery USB pin protection and Samsung Galaxy Tablet 2A emulation-critical for OEM front-panel USB ports. Versus TPS65987D-SR, it offers lower BOM cost and simpler firmware for legacy USB-A, but no USB-C PD negotiation.
Availability
MAX20038ATIA/V+ 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 long-term lifecycle support.
Supply support for MAX20038ATIA/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.
The MAX20038ATIA/V+ belongs to Maxim's automotive USB power management product line, engineered specifically to replace multi-chip USB charging solutions in AEC-Q100-compliant vehicle subsystems with single-package integration.
FAQ
What is the maximum USB load current supported by the MAX20038ATIA/V+?
The MAX20038ATIA/V+ supports up to 3.5A continuous output current on its 5V rail, delivered through integrated synchronous MOSFETs. USB load current is limited by both a fixed internal peak-current threshold and a user-configurable external current-sense amplifier threshold, enabling precise control for Apple 2.1A, Samsung Galaxy Tablet 2A, and other BC1.2-compliant profiles. The MAX20038ATIA/V+ maintains regulation and protection across this full range under -40°C to +125°C conditions.
Does the MAX20038ATIA/V+ support USB On-The-Go (OTG) functionality?
Yes, the MAX20038ATIA/V+ is explicitly stated in its official datasheet to be compatible with the USB On-The-Go specification. It achieves this through bidirectional USB data switches (USB_DP/USB_DM) and VBUS control logic that supports role swapping between host and peripheral modes. The MAX20038ATIA/V+ implements OTG session request protocol (SRP) and host negotiation protocol (HNP) signaling via its integrated USB interface, enabling seamless peripheral attachment detection and handover without external transceivers.
How does the MAX20038ATIA/V+ compensate for voltage drop in long USB cables?
The MAX20038ATIA/V+ compensates for voltage drop in captive automotive USB cables-up to 600mΩ-using a user-programmable voltage gain circuit in its feedback path. This gain adjustment, configurable via I²C register writes or external resistor dividers, increases the target VOUT to offset IR losses, ensuring ≥4.75V reaches the portable device connector. The MAX20038ATIA/V+ integrates a dedicated current-sense amplifier to monitor load current and dynamically adjust compensation, maintaining USB specification compliance across varying cable lengths and temperatures.
What protection features does the MAX20038ATIA/V+ provide on its USB pins?
The MAX20038ATIA/V+ provides short-to-battery protection on all USB pins (USB_DP, USB_DM, VBUS), meaning each pin can withstand direct connection to 12V or 24V automotive battery rails without damage or latch-up. This differs from the MAX20037, which offers short-to-VBUS protection instead. Additionally, the MAX20038ATIA/V+ includes ±15kV air / ±8kV contact ESD protection per ISO 10605 and IEC 61000-4-2, plus overtemperature shutdown and soft-start inrush current limiting-all verified under AEC-Q100 stress testing.
Is the MAX20038ATIA/V+ pin-compatible with other devices in the MAX20037/MAX20038 family?
Yes, the MAX20038ATIA/V+ shares identical pinout, package (TQFN-CU/28), and footprint with MAX20037 variants and other MAX20038 suffix versions (e.g., MAX20038ATIB/V+, MAX20038ATIC/V+). All devices in this family use the same 5mm × 5mm 28-pin TQFN layout, enabling PCB design reuse across functional variants. However, firmware and external resistor configurations must be validated per device-specific features-e.g., MAX20038ATIA/V+ requires different I²C settings than MAX20037 due to distinct USB protection architecture.
MAX20038ATIA/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A
- Frequency - Switching:
- 275kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX20038ATIA/V+ FAQ
1.How can I place an order for MAX20038ATIA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20038ATIA/V+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX20038ATIA/V+ reliable?
The price and inventory of MAX20038ATIA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20038ATIA/V+ is usually 5 days.
3.What payment methods are accepted for MAX20038ATIA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20038ATIA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20038ATIA/V+?
MAX20038ATIA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20038ATIA/V+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX20038ATIA/V+?
For technical support, including MAX20038ATIA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20038ATIA/V+ requirements.
6.How does Aetrix verify that MAX20038ATIA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX20038ATIA/V+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX20038ATIA/V+ meets industry standards.
7.What is the process for return or replacement of MAX20038ATIA/V+?
All MAX20038ATIA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20038ATIA/V+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX20038ATIA/V+ part is unused and in its original packaging.
Return procedure for MAX20038ATIA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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