My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20459ATJA/V+
- Part No.:
- MAX20459ATJA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX20459ATJA/V+.pdf
- Description:
- IC REG BUCK ADJ 3A 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:479
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX20459ATJA/V+ from Maxim Integrated is an automotive-grade, 3A synchronous step-down converter with integrated USB Type-C DFP controller, BC1.2/Apple/Samsung dedicated charger detection, and USB load current sensing. It operates from 4.5V to 28V input (40V load dump tolerant), delivers 5V–7V at up to 3A, and supports programmable switching frequency from 310kHz to 2.2MHz. It is used in vehicle-mounted USB-C charging modules for smartphones and tablets.
For engineers reviewing the MAX20459ATJA/V+ datasheet, MAX20459ATJA/V+ pinout, MAX20459ATJA/V+ application, or MAX20459ATJA/V+ equivalent, key selection considerations include AEC-Q100 qualification, ±15kV ISO 10605 ESD protection on CC/HVD pins, thermal foldback under high-ambient conditions, spread-spectrum EMI reduction, and I²C-configurable USB voltage compensation for cable resistance up to 474mΩ.
Technical Context
The MAX20459ATJA/V+ integrates a fully synchronous buck regulator with internal high-side and low-side MOSFETs, supporting forced-PWM, intelligent skip-mode, and spread-spectrum operation via SYNC pin. Its USB subsystem implements dual-role CC1/CC2 detection logic with precedence-based charge mode selection (Type-C > Apple > Samsung > BC1.2).
It features dual feedback paths: primary DC-DC regulation via external resistive divider, and dynamic USB output voltage adjustment using SENSP/SENSN differential sensing and programmable gain. Fault management includes overtemperature warning, automatic thermal foldback, short-to-battery protection on VBUS/HVD±, and I²C-accessible register-mapped diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V; withstands 40V load dump transients for <1s - enables direct connection to automotive battery rail without external TVS. |
| Output Current | Up to 3A continuous; supports USB-C PD sink negotiation up to 7V/3A - sufficient for fast-charging modern smartphones and tablets. |
| Switching Frequency | Programmable 310kHz–2.2MHz; allows trade-off between efficiency (lower freq), EMI (spread-spectrum), and board area (higher freq). |
| USB Cable Compensation | User-programmable voltage gain adjusts output to compensate for up to 474mΩ cable resistance - maintains regulated voltage at device connector. |
| ESD Protection | ±15kV air / ±8kV contact per ISO 10605 (330pF/330Ω) on CC1, CC2, HVD+, HVD− - meets automotive infotainment port robustness requirements. |
| Operating Temperature | −40°C to +125°C ambient; AEC-Q100 Grade 1 qualified - suitable for under-dash and center-console mounting locations. |
| Package | 32-pin TQFN (5mm × 5mm × 0.75mm); exposed thermal pad enhances power dissipation in compact layouts. |
Pinout & Package
The MAX20459ATJA/V+ is housed in a 32-pin, 5mm × 5mm, 0.75mm-height TQFN package (package code T3255+4C) with exposed thermal pad (EP) for enhanced thermal performance. Pin numbering follows standard counter-clockwise convention starting from top-left corner (Pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND | Power Ground | Primary return path for high-current buck switch node (LX) and USB load - must be low-inductance plane connected to EP. |
| AGND | Analog Ground | Reference for sensitive analog blocks (USB CC detection, current sense amplifier, ADC) - isolated from PGND to avoid noise coupling. |
| VSUPSW | Main Input Supply | 4.5V–28V automotive battery input; includes 40V transient tolerance - connects directly to fuse box or main distribution point. |
| LX | Switch Node | Drives external buck inductor; requires tight layout with low-parasitic path to PGND and input/output capacitors. |
| CC1 / CC2 | USB Type-C Configuration Channel | Dual-purpose pins for UFP/DFP role detection and current advertisement; integrate ESD clamps and pull-up/down logic. |
| HVD+ / HVD− | High-Voltage Detection | Monitor VBUS for short-to-battery events; trigger fault shutdown if VBUS exceeds VSUPSW by >1.5V - protects downstream USB devices. |
| SENSP / SENSN | USB Load Current Sense | Differential inputs to internal 10-bit current-sense amplifier; enable precise USB current limiting and remote voltage compensation. |
| SYNC | Frequency Synchronization | Accepts external clock (310kHz–2.2MHz) or outputs internal frequency - enables multi-phase synchronization or EMI "parking". |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB-C DFP Controller | Eliminates need for separate USB PD controller IC; supports full Type-C source behavior including Rp/Rd detection and current advertisement (500mA/1.5A/3A). |
| Legacy Charger Detection | Automatically identifies Apple (D+ = D− = 2.0V), Samsung (D+ = 1.2V, D− = 0.6V), and BC1.2 DCP (shorted D+/D−) - ensures compatibility with non-Type-C devices. |
| Programmable USB Voltage Compensation | Adjusts output voltage in real time based on measured USB load current and user-defined cable resistance - maintains 5V ±5% at portable device port. |
| Spread-Spectrum Modulation | Reduces peak EMI amplitude by spreading switching energy across 100kHz bandwidth - helps pass CISPR 25 Class 5 radiated emissions testing. |
| Thermal Foldback with Warning | Reduces output current linearly above 115°C junction temperature and asserts FAULT pin before reaching 150°C shutdown - prevents thermal runaway during sustained high-load operation. |
Applications
| Automotive In-Car USB-C Charging Module | Center Console Fast-Charging Port |
|---|---|
Use Scenario: Integrated into vehicle center console to provide USB-C charging for driver and front passenger mobile devices. IC Role / Device Role / Timing Role: Single-chip power + USB interface solution delivering regulated 5V/3A output with Type-C detection, legacy charger support, and cable-drop compensation. Use Value: Reduces BOM count by eliminating discrete buck controller, USB PD IC, and charger ID IC - lowers system cost and PCB area by >40% vs. discrete implementation. | Use Scenario: Mounted behind OEM or aftermarket center console panel with USB-C receptacle routed to surface. IC Role / Device Role / Timing Role: Provides robust, AEC-Q100-compliant USB power delivery with ESD-hardened CC/HVD pins and thermal foldback for enclosed environments. Use Value: Withstands repeated hot-plug cycles and 125°C under-hood adjacent temperatures while maintaining stable 5V output - extends field reliability beyond 10-year vehicle lifecycle. |
| Rear Seat Entertainment (RSE) Power Hub | Aftermarket Dashcam + Phone Charging Adapter |
Use Scenario: Powers dual-screen RSE systems with simultaneous USB-C video (DP Alt Mode) and charging capability. IC Role / Device Role / Timing Role: Supplies clean, low-noise 5V bus for USB peripherals while enabling I²C-controlled diagnostics and fault logging. Use Value: Fixed-frequency PWM mode eliminates audible noise in quiet cabin environments; SYNC pin allows EMI coordination with display timing controllers. | Use Scenario: Compact adapter converting 12V vehicle supply to dual USB-C ports for dashcam and smartphone. IC Role / Device Role / Timing Role: Delivers 3A total output with independent current limiting and overvoltage protection per port via external FET control (G_DMOS pin). Use Value: G_DMOS gate driver supports external high-side switch for secondary port - enables dual-port redundancy and independent fault isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive USB-C charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333-AEC1 | Standalone 3A AEC-Q100 buck only; no USB-C/BC1.2/charger detection - requires external USB controller and level-shifting circuitry. | Requires additional ICs for USB functionality; increases design complexity and board area. | Choose when USB protocol handling is implemented elsewhere (e.g., MCU-based) and only high-efficiency DC-DC is needed. |
| STUSB4500QTR | USB-C DFP controller only; no integrated DC-DC - requires external 5V supply and current-limiting switch. | Lacks power conversion; cannot replace MAX20459ATJA/V+ in single-stage battery-to-USB designs. | Choose when existing 5V rail is available and only USB-C interface logic and detection are required. |
Compared with MPQ4333-AEC1 and STUSB4500QTR, the MAX20459ATJA/V+ uniquely combines automotive-grade buck regulation, USB-C DFP control, and legacy charger detection in one package - reducing component count, validation effort, and thermal footprint for in-vehicle USB charging systems.
Availability
The MAX20459ATJA/V+ is available at Aetrix Electronics and suitable for automotive infotainment systems, center-console charging modules, and rear-seat entertainment hubs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for MAX20459ATJA/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 applications.
The MAX20459ATJA/V+ belongs to Maxim's automotive power and USB interface product line, engineered specifically to consolidate high-current DC-DC conversion and USB-C charging intelligence into a single AEC-Q100-qualified device for space-constrained vehicle platforms.
FAQ
What is the maximum input voltage the MAX20459ATJA/V+ can withstand during load dump events?
The MAX20459ATJA/V+ supports up to 40V on the VSUPSW pin for durations less than 1 second, meeting ISO 7637-2 Pulse 5a load dump requirements. This eliminates the need for external TVS diodes in most 12V automotive applications, simplifying front-end protection design while maintaining robustness against alternator-induced transients.
Does the MAX20459ATJA/V+ support USB Power Delivery (PD) communication or only fixed-voltage DFP operation?
The MAX20459ATJA/V+ implements USB Type-C DFP functionality with fixed-voltage output (5V–7V) and current advertisement (500mA/1.5A/3A) but does not support USB PD message exchange (e.g., SOP packets, VDMs). It complies with USB Type-C specification for source behavior without requiring BMC physical layer or PD controller firmware.
How is USB cable voltage drop compensated in the MAX20459ATJA/V+?
The MAX20459ATJA/V+ uses differential sensing across SENSP/SENSN to measure USB load current and applies user-programmable gain to increase output voltage proportionally - compensating for IR drop across cables up to 474mΩ. This closed-loop adjustment ensures regulated voltage is maintained at the connected device, not just at the IC output.
Can the MAX20459ATJA/V+ operate without I²C configuration?
Yes, the MAX20459ATJA/V+ supports standalone operation using external CONFIG1–CONFIG3 resistors to set USB current limit, output voltage, spread-spectrum enable, and charge detection modes. I²C is optional for dynamic reconfiguration, diagnostics, and fault logging - making it suitable for both simple plug-and-play and advanced supervised systems.
What thermal protection mechanisms does the MAX20459ATJA/V+ implement?
The MAX20459ATJA/V+ includes three-tier thermal protection: (1) pre-warning flag at 115°C junction temperature, (2) automatic linear current foldback above that threshold, and (3) hard shutdown at 150°C. All are internally monitored with no external components required - ensuring safe operation during sustained high-ambient or high-load conditions typical in automotive cabins.
MAX20459ATJA/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 3A
- Frequency - Switching:
- 410kHz, 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
MAX20459ATJA/V+ FAQ
1.How can I place an order for MAX20459ATJA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20459ATJA/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 MAX20459ATJA/V+ reliable?
The price and inventory of MAX20459ATJA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20459ATJA/V+ is usually 5 days.
3.What payment methods are accepted for MAX20459ATJA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20459ATJA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20459ATJA/V+?
MAX20459ATJA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20459ATJA/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 MAX20459ATJA/V+?
For technical support, including MAX20459ATJA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20459ATJA/V+ requirements.
6.How does Aetrix verify that MAX20459ATJA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX20459ATJA/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 MAX20459ATJA/V+ meets industry standards.
7.What is the process for return or replacement of MAX20459ATJA/V+?
All MAX20459ATJA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20459ATJA/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 MAX20459ATJA/V+ part is unused and in its original packaging.
Return procedure for MAX20459ATJA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20459ATJA/V+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
