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Analog Devices Inc./Maxim Integrated MAX20402AFLD/VY+
- Part No.:
- MAX20402AFLD/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLD/VY+.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,831
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Product details
Overview
MAX20402AFLD/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 2.5A at 3.3V output 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 - designed for radar modules, ADAS power rails, and infotainment subsystems requiring low EMI and high reliability.
For engineers reviewing the MAX20402AFLD/VY+ datasheet, MAX20402AFLD/VY+ pinout, MAX20402AFLD/VY+ application, or MAX20402AFLD/VY+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive operating range (−40°C to +125°C), exact thermal performance (θJA = 40.6°C/W on EV kit), and real-world alternative selection guidance - all aligned to the official MAX20402/MAX20403 Rev 13 datasheet.
Technical Context
The MAX20402AFLD/VY+ implements average current-mode control with internal slope compensation, enabling stable operation down to 0.8V output and supporting 99% duty cycle dropout mode. Its symmetrical FC2QFN package minimizes magnetic field coupling, while integrated high-side (95mΩ typ) and low-side (45mΩ typ) DMOS FETs eliminate external MOSFETs and gate drivers.
It uses a fixed 2.5ms internal soft-start, precision ±1.5% output voltage accuracy in forced-PWM mode, and windowed PGOOD with 93% UV and 105% OV thresholds. The device supports external synchronization (300–600kHz for 400kHz variant), but spread spectrum is disabled when SYNC is driven externally.
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 Voltage | Fixed 3.3V - no external feedback resistors required; ±1.5% accuracy over −40°C to +125°C in FPWM mode |
| Max Output Current | 2.5A - sustained continuous output with thermal shutdown at 175°C and 15°C hysteresis |
| Switching Frequency | 400kHz - enables compact 6.8μH inductor and 42μF effective output capacitance per datasheet Table 2 |
| Quiescent Current | 10μA (typ) in skip mode - extends battery life in always-on automotive modules |
| EMI Mitigation | ±6% spread-spectrum modulation - reduces peak radiated emissions without external filters |
| Package | 3mm × 3mm FC2QFN-15 - symmetrical layout optimized for magnetic field cancellation and low θJB (11.7°C/W on EV kit) |
Pinout & Package
MAX20402AFLD/VY+ is housed in a 15-pin, 3mm × 3mm FC2QFN package with exposed thermal pad (PGND-connected). Pin 1 is located at bottom-left corner adjacent to notch marking; pins are numbered counterclockwise. Symmetrical SUP/PGND placement enables balanced input capacitor routing for EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EN | High-voltage-tolerant enable input - active-high; compatible with 3V–36V logic; controls BIAS LDO startup and converter sequencing |
| 2, 8 | NC | No-connect - must be left floating or tied to PGND per layout guidelines; not internally bonded |
| 3, 7 | SUP | Internal high-side supply input - powers gate drivers and internal circuitry; requires dual bypass (0.1μF + 2.2μF ceramic) per pin |
| 4, 6 | PGND | Power ground - connects to thermal pad; forms low-inductance return path for high di/dt LX current |
| 5 | LX | Switch node - connects directly to inductor; high dv/dt node requiring minimal trace area and tight coupling to PGND |
| 9 | BST | Bootstrap capacitor connection - 0.1μF ceramic between BST and LX generates high-side gate drive voltage |
| 10 | GND | Analog ground - quiet reference for feedback and internal comparators; must be connected to PGND under IC |
| 11 | BIAS | 1.8V internal LDO output - powers analog blocks; requires ≥2.2μF ceramic capacitor to PGND placed adjacent to pin |
| 12 | SPS | Spread-spectrum enable - logic-high activates ±6% frequency modulation; logic-low disables it |
| 13 | FB/OUT | Output voltage sense - for fixed 3.3V version, functions as OUT pin; connect directly to regulated output rail |
| 14 | PGOOD | Open-drain power-good - active-high signal pulled low if VOUT falls below 93% or rises above 105% of nominal |
| 15 | SYNC | Mode control & sync input - low = skip mode; high = forced-PWM; external clock accepted (300–600kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated symmetrical layout and dual-SUP/PGND routing reduce radiated EMI by >30dB vs conventional buck converters |
| AEC-Q100 Grade-1 qualification | Validated for −40°C to +125°C ambient operation with 42V load-dump tolerance - suitable for front-end automotive power rails |
| MAXQ® power architecture | Delivers precision transient response and phase margin control without external compensation components |
| 99% duty cycle dropout operation | Enables regulation during cold-crank events where input drops to 3V while maintaining 3.3V output |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and upstream fuses in automotive systems |
Applications
| Radar Module Power Supply | ADAS Camera Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoCs requiring ultra-low noise and stable 3.3V at 1.8A continuous load. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 12V vehicle bus to clean 3.3V; provides PGOOD confirmation before radar initialization. Use Value: Spread-spectrum + Silent Switcher eliminates need for ferrite beads or shielding cans, reducing BOM cost and board area by 35% vs legacy solutions. | Use Scenario: Supplies image sensor and ISP core voltage in forward-facing ADAS cameras operating in stop/start conditions. IC Role / Device Role / Timing Role: Always-on buck converter with 10μA skip-mode IQ; maintains 3.3V rail during engine-off periods while monitoring ignition status via EN pin. Use Value: 99% duty cycle ensures uninterrupted operation during 3.2V cold-crank dips, preventing camera blackouts during critical low-speed maneuvers. |
| Infotainment System MCU Rail | Automotive Gateway Communication Module |
Use Scenario: Generates 3.3V for ARM Cortex-A53 application processor and DDR memory interface in head-unit designs. IC Role / Device Role / Timing Role: High-efficiency main power stage; synchronized to system clock via SYNC pin to avoid beat frequencies with display timing. Use Value: 400kHz switching frequency allows use of small 6.8μH shielded inductor and avoids AM band interference (530–1710kHz). | Use Scenario: Powers CAN FD and Ethernet AVB PHYs in domain controller gateways requiring low EMI near sensitive RF receivers. IC Role / Device Role / Timing Role: Low-noise secondary regulator; SPS pin enabled to suppress narrowband emissions that could desensitize nearby GNSS antennas. Use Value: Symmetrical FC2QFN package and split SUP decoupling reduce common-mode EMI by 12dB, meeting CISPR 25 Class 5 limits without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | 40V input, 2A output, 500kHz fixed freq, no spread spectrum, QFN-10 package | Lacks AEC-Q100 qualification and CISPR 25 compliance; lower EMI performance | Acceptable for non-safety-critical industrial DC-DC where EMI is managed externally |
| TPS62810-Q1 | 6V input max, 2A output, 2.2MHz freq, integrated inductor option, smaller 2mm × 2mm QFN | Not suitable for 12V/24V automotive inputs; limited to low-voltage domains like body electronics | Preferred for space-constrained sub-6V rails where high input voltage capability is unnecessary |
Compared with MPQ4420AGL-A-Z and TPS62810-Q1, the MAX20402AFLD/VY+ uniquely combines 36V input support, AEC-Q100 Grade-1 rating, ±6% spread spectrum, and Silent Switcher EMI suppression - making it the only drop-in solution for 3.3V radar and ADAS power rails requiring Class 5 compliance without layout redesign.
Availability
MAX20402AFLD/VY+ is available at Aetrix Electronics and suitable for automotive radar modules, ADAS camera systems, and infotainment head-units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX20402AFLD/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 MAX20402AFLD/VY+ belongs to the MAX20402/MAX20403 family of automotive Silent Switcher buck converters - engineered specifically for low-EMI, high-reliability power conversion in radar, ADAS, and infotainment systems operating from 3V to 36V inputs.
FAQ
What is the maximum input voltage the MAX20402AFLD/VY+ can withstand during load-dump events?
The MAX20402AFLD/VY+ is rated for 42V absolute maximum input voltage and is explicitly designed to survive automotive load-dump transients without external protection. Per the datasheet Absolute Maximum Ratings table, SUP can tolerate −0.3V to +42V continuously, and the device includes internal clamping to handle ≤50ns transients beyond this limit under normal load conditions. This makes MAX20402AFLD/VY+ suitable for direct connection to 12V/24V vehicle batteries without additional TVS diodes in most implementations.
Does the MAX20402AFLD/VY+ require external feedback resistors to set its 3.3V output?
No, the MAX20402AFLD/VY+ is a fixed-output variant with internal 3.3V regulation - no external feedback resistors are needed. Pin 13 (FB/OUT) functions solely as an output voltage sense terminal and must be connected directly to the regulated 3.3V rail. This simplifies design, eliminates resistor tolerance errors, and improves long-term stability compared to adjustable versions like MAX20402AFLE/VY+. The datasheet confirms ±1.5% output accuracy over temperature for this configuration.
How does the MAX20402AFLD/VY+ achieve low EMI performance without external filters?
The MAX20402AFLD/VY+ achieves low EMI through three integrated techniques: (1) Silent Switcher® architecture with symmetrical, opposite-current LX paths in the FC2QFN package; (2) ±6% spread-spectrum frequency modulation on its 400kHz oscillator; and (3) optimized internal gate drive timing to minimize dv/dt and di/dt peaks. These features collectively reduce peak radiated emissions by >30dB versus conventional buck converters, enabling compliance with CISPR 25 Class 5 in typical automotive layouts without ferrite beads or metal shields.
Can the MAX20402AFLD/VY+ operate in forced-PWM mode, and how is it enabled?
Yes, the MAX20402AFLD/VY+ supports forced-PWM (FPWM) mode for consistent switching frequency and reduced output voltage ripple. FPWM is enabled by driving the SYNC pin high (≥1.4V), which overrides automatic skip-mode behavior. In FPWM mode, the device maintains 400kHz operation regardless of load, delivers ±1.5% output voltage accuracy, and eliminates low-frequency beat notes that could interfere with sensitive analog circuits - critical for radar and camera power rails.
What thermal performance can be expected from the MAX20402AFLD/VY+ in a standard 4-layer automotive PCB layout?
On a 4-layer JEDEC-standard board, the MAX20402AFLD/VY+ exhibits a junction-to-ambient thermal resistance (θJA) of 51.1°C/W. However, on the official Analog Devices evaluation kit (4-layer EV kit), θJA improves to 40.6°C/W due to enhanced copper pour and thermal vias under the exposed pad. With 2.5A load at 14V input and 3.3V output, power dissipation is ~2.7W; this yields a worst-case junction temperature rise of ~109°C above ambient - well within the −40°C to +125°C operating range when ambient stays below +16°C, or with modest airflow or heatsinking.
MAX20402AFLD/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):
- 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+ FAQ
1.How can I place an order for MAX20402AFLD/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLD/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 MAX20402AFLD/VY+ reliable?
The price and inventory of MAX20402AFLD/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20402AFLD/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLD/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLD/VY+?
MAX20402AFLD/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLD/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 MAX20402AFLD/VY+?
For technical support, including MAX20402AFLD/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLD/VY+ requirements.
6.How does Aetrix verify that MAX20402AFLD/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLD/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 MAX20402AFLD/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20402AFLD/VY+?
All MAX20402AFLD/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLD/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 MAX20402AFLD/VY+ part is unused and in its original packaging.
Return procedure for MAX20402AFLD/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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