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Analog Devices Inc./Maxim Integrated MAX20403AFLA/VY+T
- Part No.:
- MAX20403AFLA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20403AFLA/VY+T.pdf
- Description:
- IC REG BUCK 5V 3.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
MAX20403AFLA/VY+T from Analog Devices is an automotive-grade, fully integrated synchronous buck converter delivering up to 3.5A continuous output current from a 3V–36V input, featuring fixed 5V output, 2.1MHz switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for radar modules and ADAS power rails.
For engineers reviewing the MAX20403AFLA/VY+T datasheet, MAX20403AFLA/VY+T pinout, MAX20403AFLA/VY+T application, or MAX20403AFLA/VY+T equivalent, this page delivers verified electrical specs, thermal performance data, EMI-optimized layout guidance, and validated alternative selection for automotive DC-DC design.
Technical Context
The MAX20403AFLA/VY+T implements average current-mode control with internal high-side (95mΩ typ) and low-side (45mΩ typ) DMOS FETs, enabling precise transient response and stable operation down to 99% duty cycle in dropout. Its MAXQ® power architecture ensures ±1.5% output voltage accuracy in forced-PWM mode across –40°C to +125°C.
It integrates a 1.8V BIAS LDO, programmable soft-start (2.5ms typ), open-drain PGOOD with windowed monitoring (±6.25% UV/OV thresholds), and dual-mode operation: skip mode (10μA IQ) at light load or forced-PWM via SYNC pin-supporting external clock synchronization up to 2.6MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and load-dump (42V transient tolerant) in automotive systems |
| Output Current | 3.5A continuous - enables single-chip power for 5V/3A camera modules or radar SoCs |
| Output Voltage | Fixed 5V ±1.5% - eliminates external feedback resistors and improves long-term stability |
| Switching Frequency | 2.1MHz - allows use of compact 1.5μH inductors and reduces EMI above AM band |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep modes |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - prevents latch-up under sustained overload or poor heatsinking |
| EMI Mitigation | ±6% spread spectrum + symmetrical FC2QFN pinout - achieves CISPR 25 Class 5 compliance without shielding |
Pinout & Package
MAX20403AFLA/VY+T uses a 15-pin, 3mm × 3mm FC2QFN package with exposed thermal pad (F153B3FY+1 outline), optimized for low-inductance, symmetrical PCB layout to suppress magnetic-field coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Active-high logic (0.9V threshold); compatible with 3V–42V battery rail; controls full device startup/shutdown |
| SUP (Pins 3,7) | High-side supply input | Dual-supply connection for internal gate drivers; requires symmetric 2.2μF bypass per pin near PGND |
| PGND (Pins 4,6) | Power ground return | Low-impedance path for high di/dt switch currents; must be directly connected to thermal pad |
| LX (Pin 5) | Switch node | Connects to inductor; critical high-dv/dt node requiring minimal trace area and no vias |
| BST (Pin 9) | Bootstrap capacitor terminal | Drives high-side FET gate; requires 0.1μF ceramic cap between BST and LX |
| BIAS (Pin 11) | Internal 1.8V LDO output | Powers analog circuitry; requires ≥2.2μF ceramic cap to PGND for noise immunity |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high enables ±6% frequency dithering; disabled when synchronized to external clock |
| FB/OUT (Pin 13) | Output voltage sense | Fixed-output mode: connects directly to VOUT for regulation; not used as feedback divider |
| PGOOD (Pin 14) | Open-drain power-good flag | Asserts high when VOUT is within 93–105% of nominal; requires external 20kΩ pull-up to BIAS or VOUT |
| SYNC (Pin 15) | Mode control & sync input | Pulled low → skip mode; pulled high → forced-PWM; driven by external clock → synchronized operation |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated symmetrical layout and dual-SUP/PGND pins reduce radiated EMI by >20dB vs conventional buck ICs |
| AEC-Q100 Grade-1 qualification | Validated for –40°C to +125°C operation with 150°C junction limit - suitable for engine bay and radar front-end mounting |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a transients without external TVS - reduces BOM count in 12V/24V systems |
| MAXQ® power architecture | Delivers >85% efficiency at 1A–3A loads with 2.1MHz switching and tight phase-margin control |
| Fixed 2.5ms soft-start | Prevents inrush current spikes into downstream capacitors - eliminates need for external soft-start timing components |
Applications
| Radar Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoC requiring clean, low-noise 5V rail in compact front-bumper enclosure. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.5A @ 5V with <10mVpp ripple and fast load-step response (<10μs). Use Value: Spread-spectrum + Silent Switcher enables Class 5 EMI compliance without metal shielding, reducing module size and cost. | Use Scenario: Supplies image sensor and ISP in driver-monitoring system with strict sleep-mode current budget. IC Role / Device Role / Timing Role: Always-on 5V converter operating in skip mode during vehicle sleep, drawing only 10μA IQ. Use Value: Ultra-low quiescent current extends battery hold-up time beyond 30 days without recharge. |
| Infotainment Head Unit | Automotive Gateway ECU |
Use Scenario: Generates 5V for display interface and audio codec in centralized infotainment platform. IC Role / Device Role / Timing Role: High-efficiency intermediate rail converter supporting dynamic load steps from 100mA to 3A. Use Value: 99% dropout capability maintains regulation during cold-crank (5.5V battery), preventing system reset. | Use Scenario: Provides isolated 5V domain for CAN FD and Ethernet PHYs in zone controller architecture. IC Role / Device Role / Timing Role: Robust primary DC-DC stage with overvoltage, overtemperature, and short-circuit protection. Use Value: Integrated protection eliminates need for external OVP/FET drivers, simplifying safety-critical BOM. |
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, 5A output, 2.1MHz, no spread spectrum, 12-pin WQFN | Higher current but larger package (3.5mm × 4.5mm); lacks CISPR 25 Class 5 validation | Select when >3.5A peak load required and EMI filtering can be added externally |
| TPS62933RTER | 3V–36V input, 3.5A output, 2.25MHz, integrated ferrite-bead filter, 16-pin QFN | Includes input filter for enhanced conducted EMI suppression; higher BOM cost and footprint | Select when board-level conducted emissions must meet CISPR 25 Class 5 without layout optimization |
Compared with LM61480QRNXTQ1 and TPS62933RTER, the MAX20403AFLA/VY+T offers superior EMI performance in minimal 3mm × 3mm area due to Silent Switcher symmetry and built-in spread spectrum-reducing layout sensitivity and eliminating shielding requirements in space-constrained radar designs.
Availability
MAX20403AFLA/VY+T is available at Aetrix Electronics and suitable for automotive radar, ADAS camera modules, and infotainment head units requiring stable component supply, AEC-Q100 compliance, and production-ready EMI performance.
Supply support for MAX20403AFLA/VY+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
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 MAX20403AFLA/VY+T belongs to the MAX20402/MAX20403 Silent Switcher® buck converter family, engineered specifically for ultra-low EMI, high-density automotive power supplies where board space, thermal constraints, and regulatory compliance are critical.
FAQ
What is the maximum input voltage transient the MAX20403AFLA/VY+T can withstand?
The MAX20403AFLA/VY+T is rated for 42V transient tolerance on the SUP pin per ISO 7637-2 Pulse 5a, enabling direct connection to automotive battery rails without external TVS diodes. This rating applies to transients ≤50ns duration under normal operating conditions and full-load current, as specified in the Absolute Maximum Ratings table.
Does the MAX20403AFLA/VY+T require external feedback resistors for its 5V output?
No, the MAX20403AFLA/VY+T features a factory-trimmed internal 5V reference and does not require external feedback resistors. Pin 13 (FB/OUT) functions solely as an output voltage sense input in fixed-output mode and must be connected directly to the regulated 5V rail for PGOOD monitoring and loop stability.
How does the MAX20403AFLA/VY+T achieve CISPR 25 Class 5 compliance?
The MAX20403AFLA/VY+T achieves CISPR 25 Class 5 compliance through three integrated features: Silent Switcher® symmetrical pinout that cancels magnetic fields, ±6% spread-spectrum frequency modulation to lower peak EMI, and optimized internal current-loop layout - all validated using the official Analog Devices EV kit (MAX20403EVKIT#) per standard test setup.
What is the thermal resistance (θJA) of the MAX20403AFLA/VY+T on a 4-layer JEDEC board?
On a standard 4-layer JEDEC board, the MAX20403AFLA/VY+T exhibits a junction-to-ambient thermal resistance (θJA) of 51.1°C/W. This value assumes proper PCB layout including thermal vias under the exposed pad and copper pour on inner layers - actual θJA in customer designs may improve to ~40.6°C/W using the recommended EV kit layout.
Can the MAX20403AFLA/VY+T operate in forced-PWM mode while synchronized to an external clock?
Yes, the MAX20403AFLA/VY+T enters forced-PWM mode when the SYNC pin is driven with an external clock signal within the specified range (1.7–2.6MHz for 2.1MHz internal setting). The device synchronizes to the external clock within two cycles at the rising edge, maintaining constant frequency and phase alignment - ideal for noise-sensitive multi-rail systems.
MAX20403AFLA/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFQFN
- Packaging:
- Tape & Reel (TR)
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 15-FC2QFN (3x3)
MAX20403AFLA/VY+T FAQ
1.How can I place an order for MAX20403AFLA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20403AFLA/VY+T 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+T reliable?
The price and inventory of MAX20403AFLA/VY+T 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+T is usually 5 days.
3.What payment methods are accepted for MAX20403AFLA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20403AFLA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20403AFLA/VY+T?
MAX20403AFLA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20403AFLA/VY+T 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+T?
For technical support, including MAX20403AFLA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20403AFLA/VY+T requirements.
6.How does Aetrix verify that MAX20403AFLA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20403AFLA/VY+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX20403AFLA/VY+T?
All MAX20403AFLA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20403AFLA/VY+T, 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+T part is unused and in its original packaging.
Return procedure for MAX20403AFLA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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