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Analog Devices Inc./Maxim Integrated MAX20403AFLA/VY+
- Part No.:
- MAX20403AFLA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20403AFLA/VY+.pdf
- Description:
- IC REG BUCK 5V 3.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
MAX20403AFLA/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter delivering up to 3.5A output current across a 3V–36V input range, featuring Silent Switcher® architecture, 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for radar and ADAS power rails.
For engineers reviewing the MAX20403AFLA/VY+ datasheet, MAX20403AFLA/VY+ pinout, MAX20403AFLA/VY+ application, or MAX20403AFLA/VY+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive operating parameters (−40°C to +125°C, 42V load-dump tolerant), and real-world EMI mitigation features including symmetrical FC2QFN layout and forced-PWM/skip-mode control.
Technical Context
The MAX20403AFLA/VY+ implements average current-mode control with internal slope compensation, enabling stable operation down to 0.8V output using external feedback resistors while maintaining <55ns minimum on-time. Its MAXQ® power architecture delivers ±1.5% output voltage accuracy in forced-PWM mode and supports 99% duty-cycle dropout operation for cold-crank conditions.
It integrates high-side (95–165mΩ) and low-side (45–85mΩ) DMOS FETs, a 1.8V BIAS LDO, and precision enable thresholds (VEN_HIGH = 0.900V typ, hysteresis = 200mV). PGOOD provides windowed monitoring (93–105% VOUT) with 100μs debounce, and thermal shutdown activates at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports full automotive battery range including cold-crank (3V) and load-dump (42V transient-tolerant) |
| Output Current | Up to 3.5A - enables single-chip power for radar SoCs and camera modules without external FETs |
| Switching Frequency | 2.1MHz fixed - allows compact 1.5μH inductor and reduces EMI above AM band |
| Output Voltage | Fixed 5V - factory-trimmed for ±1.5% accuracy over −40°C to +125°C in FPWM mode |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep modes |
| Package | 3mm × 3mm FC2QFN-15 - symmetrical pinout minimizes magnetic field coupling for CISPR 25 Class 5 compliance |
| EMI Mitigation | ±6% spread spectrum + Silent Switcher® - reduces peak radiated emissions by >10dB vs conventional buck converters |
Pinout & Package
MAX20403AFLA/VY+ uses a 15-pin, 3mm × 3mm FC2QFN package with exposed thermal pad (pin 15 is PGND). The symmetrical layout places SUP (pins 3,7), PGND (pins 4,6,15), and LX (pin 5) to cancel magnetic fields and minimize loop area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | High-voltage enable input | Active-high logic; tolerates 3V–42V - directly connectable to automotive battery or microcontroller GPIO |
| SUP (Pins 3,7) | Internal high-side supply input | Power source for gate drivers and internal circuitry; requires dual 0.1μF + 2.2μF ceramic bypass per pin |
| LX (Pin 5) | Switch node | Connects to inductor; high dv/dt node requiring minimal trace area and tight coupling to BST capacitor |
| BST (Pin 9) | Bootstrap capacitor connection | Drives high-side FET gate; requires 0.1μF ceramic capacitor between BST and LX |
| BIAS (Pin 11) | 1.8V internal LDO output | Powers analog blocks; requires ≥2.2μF ceramic capacitor to PGND for stability |
| FB/OUT (Pin 13) | Feedback/output sense | For fixed 5V version: output voltage monitor; connects directly to VOUT for PGOOD and regulation |
| PGOOD (Pin 14) | Open-drain power-good signal | Active-high flag indicating VOUT within 93–105% window; requires external 20kΩ pull-up to BIAS or VOUT |
| SYNC (Pin 15) | Mode selection & sync input | Pulled low → skip mode; pulled high → forced-PWM; driven externally → synchronizes to 1.7–2.6MHz clock |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop layout with symmetrical power paths reduces common-mode EMI by >20dB, enabling CISPR 25 Class 5 compliance without shielding |
| MAXQ® power architecture | Delivers 99% duty cycle capability and ±1.5% output accuracy under load transients - critical for ASIL-B functional safety systems |
| Spread-spectrum modulation | ±6% frequency dithering centered at 2.1MHz spreads energy across 126kHz bandwidth, lowering peak radiated emissions in narrowband tests |
| AEC-Q100 Grade 1 | Qualified from −40°C to +125°C ambient with 42V load-dump tolerance - meets automotive power rail reliability requirements |
| Fixed 2.5ms soft-start | Internally programmed ramp prevents inrush current into downstream capacitors - eliminates need for external soft-start circuitry |
Applications
| Radar Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoC requiring clean, low-noise 5V rail in engine compartment. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering 3.5A at 5V with ultra-low EMI to avoid interference with RF front-end. Use Value: Silent Switcher® + spread spectrum ensures radiated emissions stay below CISPR 25 Class 5 limits without ferrite beads or metal shields. | Use Scenario: Supplies image sensor and ISP in rear-view camera with extended temperature operation. IC Role / Device Role / Timing Role: Fixed-output buck converter providing regulated 5V at up to 3.5A from 12V battery with cold-crank support. Use Value: 99% duty cycle operation maintains regulation down to 3V input, eliminating brownout during engine start. |
| Infotainment Head Unit | Automotive Gateway MCU |
Use Scenario: Generates 5V for display controller and audio codec in center-stack infotainment system. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current DC-DC stage powering always-on subsystems. Use Value: 10μA quiescent current in skip mode minimizes battery drain during vehicle sleep, extending parasitic draw budget. | Use Scenario: Powers 32-bit automotive MCU and CAN transceivers in domain controller with strict EMI constraints. IC Role / Device Role / Timing Role: Primary 5V supply with PGOOD monitoring and thermal protection for safety-critical boot sequence. Use Value: Accurate windowed PGOOD (93–105%) and ±1.5% VOUT accuracy ensure deterministic MCU reset behavior across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 4.5V–36V input, 8A output, 2.1MHz, no spread spectrum, 12-pin WQFN | Higher current capacity but larger solution size and higher EMI without built-in spread spectrum | Select when >3.5A load or lower cost per amp is prioritized over EMI footprint |
| TPS62933RQWR | 3V–36V input, 3.5A output, 2.1MHz, integrated spread spectrum, 16-pin QFN | Similar EMI performance but lacks AEC-Q100 qualification and 42V load-dump rating | Select for non-automotive industrial applications where AEC-Q100 is not required |
Compared with LM61480QRNXTQ1 and TPS62933RQWR, the MAX20403AFLA/VY+ uniquely combines AEC-Q100 Grade 1 qualification, 42V load-dump tolerance, and Silent Switcher® EMI reduction in a 3mm × 3mm FC2QFN - making it the only option qualified for radar front-end power where both reliability and radiated emissions are constrained.
Availability
MAX20403AFLA/VY+ is available at Aetrix Electronics and suitable for automotive radar systems, ADAS camera modules, and infotainment head units requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for MAX20403AFLA/VY+ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20403 belongs to Analog Devices' automotive power management portfolio, designed specifically for safety-critical, low-EMI DC-DC conversion in radar, camera, and gateway ECUs operating under harsh automotive conditions.
FAQ
What is the maximum output current of the MAX20403AFLA/VY+?
The MAX20403AFLA/VY+ delivers up to 3.5A continuous output current. This rating is validated across the full −40°C to +125°C operating temperature range and supports peak loads typical of automotive radar transceivers. The device achieves this with integrated 95–165mΩ high-side and 45–85mΩ low-side MOSFETs, eliminating the need for external power switches in most 5V rail designs.
Does the MAX20403AFLA/VY+ require external components for basic operation?
Yes, the MAX20403AFLA/VY+ requires external components for stable operation: two 2.2μF input capacitors (one per SUP pin), a 0.1μF bootstrap capacitor between BST and LX, a 2.2μF capacitor on BIAS, a 20kΩ pull-up on PGOOD, and an output LC filter (e.g., 1.5μH inductor + 21μF COUT for 2.1MHz operation). No external compensation network is needed due to internal loop optimization.
How does the MAX20403AFLA/VY+ achieve CISPR 25 Class 5 compliance?
The MAX20403AFLA/VY+ achieves CISPR 25 Class 5 compliance through three integrated features: Silent Switcher® symmetrical FC2QFN layout that cancels magnetic fields, ±6% spread-spectrum modulation that lowers peak emissions, and optimized internal gate drive timing that minimizes dv/dt noise. These features eliminate the need for external EMI filters or metal shielding in typical EV radar reference designs.
What is the purpose of the SYNC pin on the MAX20403AFLA/VY+?
The SYNC pin on the MAX20403AFLA/VY+ serves three functions: pulling it low enables skip mode for ultra-low quiescent current (10μA), pulling it high enables forced-PWM mode for constant frequency and predictable EMI, and driving it with an external 1.7–2.6MHz clock synchronizes switching to avoid beat frequencies in multi-rail systems. The device locks to external clocks within two cycles.
Is the MAX20403AFLA/VY+ qualified for automotive use?
Yes, the MAX20403AFLA/VY+ is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient), 42V load-dump tolerant, and designed for automotive applications including radar, ADAS cameras, and infotainment systems. It includes robust protections: overtemperature shutdown (175°C), overvoltage protection, short-circuit hiccup mode, and precise enable thresholds for reliable cold-crank operation.
MAX20403AFLA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 15-FC2QFN (3x3)
MAX20403AFLA/VY+ FAQ
1.How can I place an order for MAX20403AFLA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20403AFLA/VY+ 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 MAX20403AFLA/VY+ reliable?
The price and inventory of MAX20403AFLA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20403AFLA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20403AFLA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20403AFLA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20403AFLA/VY+?
MAX20403AFLA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20403AFLA/VY+ 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 MAX20403AFLA/VY+?
For technical support, including MAX20403AFLA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20403AFLA/VY+ requirements.
6.How does Aetrix verify that MAX20403AFLA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20403AFLA/VY+ 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 MAX20403AFLA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20403AFLA/VY+?
All MAX20403AFLA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20403AFLA/VY+, 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 MAX20403AFLA/VY+ part is unused and in its original packaging.
Return procedure for MAX20403AFLA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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