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Analog Devices Inc./Maxim Integrated MAX20403AFLB/VY+T
- Part No.:
- MAX20403AFLB/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20403AFLB/VY+T.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,855
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Product details
Overview
MAX20403AFLB/VY+T 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, with fixed 3.3V output, 2.1MHz switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification - deployed in ADAS radar modules for stable low-EMI power delivery under load dump conditions.
For engineers reviewing the MAX20403AFLB/VY+T datasheet, MAX20403AFLB/VY+T pinout, MAX20403AFLB/VY+T application, or MAX20403AFLB/VY+T equivalent, key selection considerations include its 3.3V fixed output, 2.1MHz/400kHz/3MHz frequency options, 99% dropout duty cycle, 10μA no-load quiescent current in skip mode, and FC2QFN 3mm × 3mm package with symmetrical EMI-optimized layout.
Technical Context
The MAX20403AFLB/VY+T implements average current-mode control with internal high-side (95–165mΩ) and low-side (45–85mΩ) MOSFETs, enabling precise transient response and stable operation down to 0.8V output via external feedback. Its MAXQ® power architecture delivers ±1.5% output voltage accuracy in forced-PWM mode and supports 2.5ms internal soft-start.
It features dual-mode operation: SYNC-low enables ultra-low-IQ skip mode (10μA), while SYNC-high forces fixed-frequency PWM; spread-spectrum (enabled via SPS pin) modulates fSW by ±6% to suppress radiated EMI peaks, and PGOOD provides windowed monitoring with 93–105% UV/OV thresholds and 100μs debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and 42V load-dump tolerant operation without external protection |
| Output Current | Up to 3.5A - enables single-chip power for 3.3V rails in radar SoCs and camera ECUs |
| Output Voltage | Fixed 3.3V ±1.5% - eliminates external resistor divider, reduces BOM count and layout sensitivity |
| Switching Frequency | 2.1MHz - allows compact 1.5μH inductor and <25μF total output capacitance per typical design |
| Quiescent Current | 10μA in skip mode - extends battery runtime during vehicle sleep modes (e.g., parking ADAS) |
| Duty Cycle Max | 99% - sustains regulation during deep automotive brownouts (e.g., 4.5V battery at cranking) |
| Thermal Shutdown | 175°C with 15°C hysteresis - ensures robustness in under-hood environments up to +125°C ambient |
Pinout & Package
MAX20403AFLB/VY+T uses a 15-pin FC2QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad, optimized for symmetrical current loops and minimal EMI radiation. Pin 1 is EN; pins 2 & 8 are NC; pins 4 & 6 are PGND; pin 10 is GND; pin 14 is open-drain PGOOD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | High-voltage enable input | Active-high logic compatible with 3V–42V battery rail; enables BIAS LDO and converter startup |
| SUP (Pins 3,7) | High-side supply input | Dual-supply connection for internal gate drivers; requires symmetric 2.2μF + 0.1μF bypass per pin |
| LX (Pin 5) | Switch node | Connects directly to inductor; critical high-di/dt path requiring minimized loop area and copper fill |
| BST (Pin 9) | Bootstrap capacitor terminal | Drives high-side FET gate; requires 0.1μF ceramic cap between BST and LX, placed adjacent to IC |
| BIAS (Pin 11) | 1.8V internal LDO output | Powers analog circuitry; requires ≥2.2μF ceramic cap to PGND for noise immunity and stability |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high activates ±6% triangular frequency modulation to reduce peak EMI emissions |
| FB/OUT (Pin 13) | Output voltage sense | For fixed-output variants like MAX20403AFLB/VY+T, connects directly to 3.3V output for regulation |
| PGOOD (Pin 14) | Power-good monitor | Open-drain signal asserting high when VOUT is within 93–105% of 3.3V; requires external 20kΩ pull-up |
| SYNC (Pin 15) | Mode control & sync input | Low = skip mode; high = forced-PWM; external clock input enables synchronization to system timing |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-path, symmetrical FC2QFN layout cancels magnetic fields, achieving CISPR 25 Class 5 compliance without shielding |
| MAXQ® power architecture | Delivers >75° phase margin and <10μs transient recovery for safety-critical ADAS power rails |
| 99% dropout operation | Maintains regulated 3.3V output even at 3.33V input - essential for automotive start-stop and cranking scenarios |
| AEC-Q100 Grade 1 | Qualified for -40°C to +125°C junction temperature - validated for under-hood deployment in radar and infotainment systems |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a transients without external TVS - reduces system-level protection cost |
Applications
| Radar Module Power Supply | ADAS Camera ECU |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoC (e.g., TI AWR2944) in front bumper assembly, operating continuously during vehicle motion and parking. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying RF front-end, DSP core, and CAN FD interface with <10mV ripple. Use Value: 2.1MHz switching avoids AM band interference; spread-spectrum and Silent Switcher layout meet OEM EMI limits without ferrite beads or metal cans. | Use Scenario: Supplies image sensor, ISP, and Ethernet PHY in surround-view camera module mounted on side mirrors or rear license plate. IC Role / Device Role / Timing Role: Single-chip 3.3V source for low-noise analog pixel readout and high-speed digital interfaces. Use Value: 10μA skip-mode IQ extends vehicle off-time battery life; 99% duty cycle sustains operation during engine cranking dips to 4.2V. |
| Automotive Infotainment Head Unit | Industrial HV DC-DC Converter Stage |
Use Scenario: Generates 3.3V for MCU, audio codec, and touch controller in center-stack display unit exposed to cabin temperature cycling. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 12V battery, supporting USB-C PD negotiation and display backlight drivers. Use Value: AEC-Q100 qualification ensures reliability over 15-year vehicle lifecycle; thermal shutdown prevents latch-up during prolonged summer cabin exposure. | Use Scenario: Used in 24V/48V industrial motor drive control board to power isolated gate drivers and position encoder interfaces. IC Role / Device Role / Timing Role: High-input-range buck stage converting 36V bus to clean 3.3V for real-time microcontroller and SPI communication. Use Value: 36V max input and 42V transient tolerance eliminate need for upstream clamping; FC2QFN thermal pad enables >2W dissipation on 2-layer PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4433AGL-AEC1-Z | 3.5A, 36V input, fixed 3.3V, 2.2MHz fSW, no spread-spectrum, QFN-13 | Lacks spread-spectrum and Silent Switcher layout - higher radiated EMI in dense ADAS PCBs | Preferred where cost is primary constraint and EMI filtering budget allows added ferrites/shielding |
| TPS6286418ARQYR | 4A, 36V input, fixed 3.3V, 2.25MHz fSW, integrated compensation, no AEC-Q100 | Not AEC-Q100 qualified; lacks load-dump tolerance and automotive temp range validation | Suitable for industrial or commercial 3.3V point-of-load where automotive qualification is not required |
Compared with MPQ4433AGL-AEC1-Z and TPS6286418ARQYR, the MAX20403AFLB/VY+T uniquely combines AEC-Q100 Grade 1, CISPR 25 Class 5 compliance via Silent Switcher layout, and 42V load-dump tolerance - making it the only option qualified for direct integration into radar and camera modules without supplemental EMI mitigation.
Availability
MAX20403AFLB/VY+T is available at Aetrix Electronics and suitable for automotive ADAS, industrial HV DC-DC, and infotainment head unit designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for MAX20403AFLB/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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The MAX20403AFLB/VY+T belongs to Analog Devices' automotive Silent Switcher® buck converter family, engineered specifically for EMI-sensitive ADAS and infotainment systems requiring compact, high-efficiency, and AEC-Q100-qualified DC-DC conversion.
FAQ
What is the maximum continuous output current of the MAX20403AFLB/VY+T?
The MAX20403AFLB/VY+T delivers up to 3.5A continuous output current under thermal-limited conditions (TJ ≤ 150°C) with adequate PCB copper and airflow. This rating applies across the full 3V–36V input range and is validated per AEC-Q100 stress testing protocols. Derating is required above +85°C ambient; refer to θJA = 40.6°C/W (EV kit) for thermal design.
Does the MAX20403AFLB/VY+T require external feedback resistors for its 3.3V output?
No, the MAX20403AFLB/VY+T has an internally trimmed 3.3V output and does not require external feedback resistors. Pin 13 (FB/OUT) functions solely as an output voltage sense input and must be connected directly to the 3.3V rail. This eliminates resistor tolerance errors and layout sensitivity, ensuring ±1.5% regulation accuracy over temperature and line.
How does the MAX20403AFLB/VY+T achieve CISPR 25 Class 5 compliance?
The MAX20403AFLB/VY+T achieves CISPR 25 Class 5 compliance through its patented Silent Switcher® architecture: symmetrical FC2QFN pinout cancels magnetic field coupling, integrated spread-spectrum modulation (±6%) smears radiated peaks, and optimized internal gate drive minimizes dv/dt noise. No external EMI filters or metal shielding are required in reference EV kit layouts.
What is the purpose of the SPS pin on the MAX20403AFLB/VY+T?
The SPS (Spread Spectrum) pin on the MAX20403AFLB/VY+T enables or disables triangular frequency modulation of the internal oscillator. When pulled high, it activates ±6% variation around the nominal 2.1MHz switching frequency, reducing peak radiated EMI by up to 10dB. It is disabled automatically when SYNC is used for external clock synchronization.
Can the MAX20403AFLB/VY+T operate with a 42V input transient?
Yes, the MAX20403AFLB/VY+T is rated for 42V absolute maximum input (SUP pin), and its internal circuitry is self-protected against transients ≤50ns exceeding this limit under normal loads. It meets ISO 7637-2 Pulse 5a (load dump) requirements without external TVS diodes, simplifying system-level surge protection for 12V/24V automotive platforms.
MAX20403AFLB/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):
- 3.3V
- 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)
MAX20403AFLB/VY+T FAQ
1.How can I place an order for MAX20403AFLB/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20403AFLB/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 MAX20403AFLB/VY+T reliable?
The price and inventory of MAX20403AFLB/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 MAX20403AFLB/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20403AFLB/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20403AFLB/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20403AFLB/VY+T?
MAX20403AFLB/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20403AFLB/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 MAX20403AFLB/VY+T?
For technical support, including MAX20403AFLB/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20403AFLB/VY+T requirements.
6.How does Aetrix verify that MAX20403AFLB/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20403AFLB/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 MAX20403AFLB/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20403AFLB/VY+T?
All MAX20403AFLB/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20403AFLB/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 MAX20403AFLB/VY+T part is unused and in its original packaging.
Return procedure for MAX20403AFLB/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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