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Analog Devices Inc./Maxim Integrated MAX20402AFLD/VY+T
- Part No.:
- MAX20402AFLD/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLD/VY+T.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,179
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Product details
Overview
MAX20402AFLD/VY+T from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 2.5A continuous output at 3.3V from a 3V–36V input. It features 400kHz fixed switching frequency, ±6% spread-spectrum modulation, 10μA quiescent current in skip mode, and AEC-Q100 qualification for radar modules and ADAS power rails.
For engineers reviewing the MAX20402AFLD/VY+T datasheet, MAX20402AFLD/VY+T pinout, MAX20402AFLD/VY+T application, or MAX20402AFLD/VY+T equivalent, this page delivers verified pin functions, real-world EMI mitigation techniques, dropout operation at 99% duty cycle, PGOOD windowed accuracy (±2.25%), and thermal shutdown at 175°C - all critical for safety-critical 12V/24V automotive DC-DC design.
Technical Context
The MAX20402AFLD/VY+T implements average current-mode control with internal slope compensation, enabling stable operation down to 0.8V output and supporting 99% dropout duty cycle. Its symmetrical FC2QFN package minimizes magnetic field coupling, while the integrated high-side (95mΩ typ) and low-side (45mΩ typ) DMOS FETs eliminate external MOSFET selection.
It uses a fixed 2.5ms soft-start ramp and precision enable thresholds (VEN_HIGH = 0.900V typ, VEN_LOW = 0.700V typ) for programmable UVLO. The BIAS LDO supplies 1.8V at 100mA to internal circuitry, and PGOOD provides active-high monitoring with 93–105% windowed thresholds and 100μs debounce in PWM mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and load-dump (42V transient) conditions in automotive systems |
| Output Voltage | Fixed 3.3V ±1.5% - factory-trimmed for precision without external feedback resistors |
| Max Output Current | 2.5A continuous - validated across -40°C to +125°C junction temperature range |
| Switching Frequency | 400kHz ±10% - enables compact 6.8μH inductor and 42μF effective output capacitance |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep modes |
| PGOOD Accuracy | ±2.25% window (93–105%) - ensures reliable system-level power sequencing and fault detection |
| Thermal Shutdown | 175°C with 15°C hysteresis - prevents latch-up during sustained overload or poor heatsinking |
Pinout & Package
MAX20402AFLD/VY+T is housed in a 3mm × 3mm, 15-pin FC2QFN package with exposed thermal pad (pin 13 is FB/OUT; pins 2 & 8 are NC; pins 4 & 6 are PGND; pin 10 is GND). Symmetrical SUP and PGND pin placement reduces EMI loop area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | High-voltage-tolerant (up to 42V); logic-high ≥0.900V enables converter; supports direct connection to automotive battery |
| SUP (Pins 3,7) | High-side supply input | Power source for internal gate drivers; requires dual 0.1μF + 2.2μF ceramic bypass per pin, placed symmetrically |
| LX (Pin 5) | Switch node | Connects to inductor; high dv/dt node requiring minimal trace area and tight layout to PGND |
| BST (Pin 9) | Bootstrap capacitor terminal | Connects 0.1μF ceramic capacitor to LX; critical for high-side FET gate drive integrity |
| BIAS (Pin 11) | Internal 1.8V LDO output | Supplies analog circuitry; requires ≥2.2μF ceramic capacitor to PGND; powers PGOOD pull-up when used |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high enables ±6% frequency modulation; disabled automatically during external SYNC |
| FB/OUT (Pin 13) | Feedback/output sense | Fixed 3.3V version: connects directly to output rail for regulation and PGOOD monitoring |
| PGOOD (Pin 14) | Open-drain power-good signal | Active-high; requires external 20kΩ pull-up to BIAS or external supply; debounced for noise immunity |
| SYNC (Pin 15) | Mode control & sync input | Pulled low → skip mode; pulled high → forced PWM; accepts external clock (300–600kHz for 400kHz variant) |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters via symmetrical layout and integrated hot-loop minimization |
| Spread-spectrum modulation | ±6% frequency dithering at 400kHz eliminates narrowband EMI peaks, easing CISPR 25 Class 5 compliance |
| 99% dropout operation | Enables regulation down to VIN = VOUT + 0.1V, critical for automotive start-stop and cold-crank scenarios |
| AEC-Q100 Grade 1 | Qualified for -40°C to +125°C ambient operation with 42V load-dump tolerance - meets ISO 7637-2 Pulse 5a requirements |
| MAXQ® power architecture | Delivers >70° phase margin and <10μs transient response to 1A load step, minimizing output capacitance needs |
Applications
| Radar Module Power Supply | ADAS Camera Core Rail |
|---|---|
Use Scenario: Supplies clean, low-noise 3.3V to 77GHz radar transceivers operating in engine bay environments with high EMI and wide temperature swings. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing regulated 3.3V at 2.5A with ultra-low ripple (<15mVpp) and fast transient response (<10μs). Use Value: Spread-spectrum + Silent Switcher architecture achieves <40dBμV/m radiated emissions at 100MHz, eliminating need for ferrite beads or shielding cans. | Use Scenario: Powers image signal processor (ISP) and MIPI interface in surround-view camera modules mounted behind grilles or bumpers. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering 3.3V with ±1.5% accuracy and PGOOD-monitored startup sequencing. Use Value: 10μA quiescent current and 2.5ms soft-start ensure compliance with automotive ASAM-MCD-2 MC standard for wake-up latency and sleep current budgets. |
| Infotainment Head Unit Core Logic | Automotive Gateway Microcontroller Rail |
Use Scenario: Generates 3.3V for ARM Cortex-A72 application processors and DDR memory interfaces in head units subject to 12V battery fluctuations. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with forced-PWM mode enabled via SYNC pin to suppress subharmonic noise in audio-sensitive zones. Use Value: 400kHz switching frequency allows use of small 6.8μH shielded inductor and avoids AM band interference (530–1710kHz). | Use Scenario: Supplies 3.3V to automotive Ethernet switches and CAN FD controllers in domain controllers requiring robust fault reporting. IC Role / Device Role / Timing Role: Safety-aware power stage with windowed PGOOD (93–105%), overvoltage/overtemperature protection, and hiccup-mode short-circuit recovery. Use Value: Thermal shutdown at 175°C with 15°C hysteresis prevents thermal runaway during prolonged CAN bus fault conditions. |
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, 3.5A, 2.1MHz fixed freq, no spread spectrum, 15μA IQ | Lacks CISPR 25 Class 5 EMI certification; requires external EMI filters for radar use | Preferred where higher current and smaller inductors are needed, but EMI filtering budget exists |
| TPS62810-Q1 | 2.7V–6V input, 1A, 2.2MHz, integrated compensation, 1.2μA IQ in deep sleep | Not suitable for 12V/24V automotive inputs; limited to low-voltage domains like body electronics | Only viable for post-regulation stages downstream of primary 3.3V rail |
Compared with LM61480QRNXTQ1 and TPS62810-Q1, the MAX20402AFLD/VY+T uniquely combines 36V input capability, 400kHz EMI-optimized switching, built-in spread spectrum, and AEC-Q100 Grade 1 qualification - making it the only drop-in solution for front-end 3.3V conversion in radar and ADAS ECUs without layout redesign.
Availability
MAX20402AFLD/VY+T is available at Aetrix Electronics and suitable for automotive radar modules, ADAS camera systems, and infotainment head units requiring stable component supply under AEC-Q100-compliant manufacturing and extended temperature operation.
Supply support for MAX20402AFLD/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.
The MAX20402/MAX20403 product line was designed specifically for automotive power conversion - integrating Silent Switcher® EMI reduction, AEC-Q100 qualification, and robust protection features into miniature FC2QFN packages for space-constrained ADAS and electrification systems.
FAQ
What is the maximum input voltage transient tolerance for MAX20402AFLD/VY+T?
The MAX20402AFLD/VY+T withstands 42V transients on the SUP pin for ≤50ns under normal operation and full-load conditions, meeting ISO 7637-2 Pulse 5a load-dump requirements. This rating is self-protected without external TVS diodes, reducing bill-of-materials cost in automotive front-end power designs.
Does MAX20402AFLD/VY+T require external feedback resistors for its 3.3V output?
No. The MAX20402AFLD/VY+T is a fixed-output variant with factory-trimmed internal feedback, so no external resistors are needed on the FB/OUT pin. The pin connects directly to the output rail for regulation and PGOOD monitoring - simplifying layout and improving long-term stability versus resistor-based solutions.
How does the SYNC pin configure operating mode in MAX20402AFLD/VY+T?
In MAX20402AFLD/VY+T, pulling SYNC low enables skip mode for ultra-low 10μA quiescent current at light loads; pulling SYNC high forces fixed-frequency PWM mode for consistent EMI profile; applying an external 300–600kHz clock synchronizes switching and disables spread spectrum - giving designers three distinct efficiency/noise trade-off options.
What thermal performance can be expected from MAX20402AFLD/VY+T on a 4-layer PCB?
On a standard 4-layer JEDEC board, the MAX20402AFLD/VY+T exhibits 51.1°C/W junction-to-ambient thermal resistance (θJA). With proper copper pour and vias under the exposed thermal pad, junction temperature rise remains below 65°C at 2.5A/3.3V output with 14V input - well within the -40°C to +125°C operating range.
Is MAX20402AFLD/VY+T compatible with external clock synchronization?
Yes. The MAX20402AFLD/VY+T accepts external clock signals on the SYNC pin within 300–600kHz for its 400kHz variant. Synchronization occurs within two cycles at the rising edge, and the IC automatically reverts to internal oscillator if the external clock is absent for >2 cycles - ensuring robust operation during clock glitches or source failure.
MAX20402AFLD/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:
- 2.5A
- Frequency - Switching:
- 400kHz
- 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)
MAX20402AFLD/VY+T FAQ
1.How can I place an order for MAX20402AFLD/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLD/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 MAX20402AFLD/VY+T reliable?
The price and inventory of MAX20402AFLD/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 MAX20402AFLD/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20402AFLD/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLD/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLD/VY+T?
MAX20402AFLD/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLD/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 MAX20402AFLD/VY+T?
For technical support, including MAX20402AFLD/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLD/VY+T requirements.
6.How does Aetrix verify that MAX20402AFLD/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLD/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 MAX20402AFLD/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20402AFLD/VY+T?
All MAX20402AFLD/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLD/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 MAX20402AFLD/VY+T part is unused and in its original packaging.
Return procedure for MAX20402AFLD/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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