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Analog Devices Inc./Maxim Integrated MAX20402AFLA/VY+
- Part No.:
- MAX20402AFLA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLA/VY+.pdf
- Description:
- IC REG BUCK 5V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,563
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Product details
Overview
MAX20402AFLA/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 2.5A at 5V output from a 3V–36V input. It features 2.1MHz 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 MAX20402AFLA/VY+ datasheet, MAX20402AFLA/VY+ pinout, MAX20402AFLA/VY+ application, or MAX20402AFLA/VY+ equivalent, this page delivers verified electrical parameters, validated thermal performance, confirmed pin-level EMI mitigation features, and real-world automotive supply-chain availability - all aligned to the exact variant specified in the ordering code.
Technical Context
The MAX20402AFLA/VY+ implements average current-mode control with internal slope compensation, enabling stable operation across wide duty-cycle ranges (up to 99%) and fast transient response. Its MAXQ® power architecture delivers ±1.5% output voltage accuracy in forced-PWM mode and supports precise PGOOD windowing (93–105% VOUT).
It integrates high-side (95–165mΩ) and low-side (45–85mΩ) DMOS FETs, a 1.8V BIAS LDO, and symmetrical FC2QFN layout optimized for magnetic field cancellation. The device accepts external synchronization (1.7–2.6MHz), enables spread-spectrum via SPS pin, and enters hiccup-mode short-circuit protection with 25ms off-time.
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 5V - factory-trimmed; ±1.5% accuracy over -40°C to +125°C ensures compliance with safety-critical ADAS voltage tolerances. |
| Max Output Current | 2.5A - sustained delivery under full thermal derating per θJA = 40.6°C/W on EV kit board. |
| Switching Frequency | 2.1MHz - enables compact 1.5μH inductor and <25μF effective output capacitance while avoiding AM band interference. |
| Quiescent Current | 10μA (typ) in skip mode - extends battery life during vehicle sleep modes without compromising wake-up latency. |
| EMI Mitigation | ±6% spread spectrum + symmetrical FC2QFN layout - meets CISPR 25 Class 5 radiated emissions limits without shielding or ferrites. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - prevents latch-up during sustained overload or poor PCB heatsinking. |
| PGOOD Accuracy | Windowed detection at 93% UV / 105% OV thresholds - provides reliable system-level power sequencing and fault isolation. |
Pinout & Package
MAX20402AFLA/VY+ is housed in a 3mm × 3mm, 15-pin FC2QFN package with exposed thermal pad (F153B3FY+1). The symmetrical pin arrangement minimizes loop inductance and cancels magnetic fields to suppress radiated EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage-tolerant (up to 42V); active-high logic enables converter only when VEN > 0.9V (min), supporting direct battery connection. |
| 3,7 SUP | High-side supply input | Dual-supply pins reduce IR drop and improve EMI; each requires local 0.1μF + 2.2μF ceramic bypassing to PGND. |
| 4,6 PGND | Power ground | Low-impedance return path for high di/dt switch currents; must be connected directly to thermal pad and external ground plane. |
| 5 LX | Switch node | Connects to inductor; high dv/dt node requiring minimal trace area and no vias to limit EMI and ringing. |
| 9 BST | Bootstrap capacitor terminal | Requires 0.1μF ceramic cap between BST and LX to generate gate drive voltage for high-side FET. |
| 10 GND | Analog ground | Quiet reference for feedback and internal circuitry; must be star-connected to PGND under IC thermal pad. |
| 11 BIAS | Internal 1.8V LDO output | Powers internal analog blocks; requires ≥2.2μF ceramic cap to PGND placed adjacent to pin for noise immunity. |
| 12 SPS | Spread-spectrum enable | Logic-high activates ±6% triangular frequency modulation; disabled during external SYNC to avoid conflict. |
| 13 FB/OUT | Feedback/sense input | Configured as output sense pin for fixed 5V version; connects directly to VOUT to close regulation loop. |
| 14 PGOOD | Open-drain power-good | Active-high signal pulled low if VOUT falls below 93% or rises above 105%; requires external 20kΩ pull-up to BIAS or VOUT. |
| 15 SYNC | Mode/frequency control | Pulled low → skip mode; pulled high → forced PWM; driven by external clock (1.7–2.6MHz) for system synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop layout with symmetrical power paths reduces peak radiated EMI by >20dB vs conventional buck ICs. |
| MAXQ® power architecture | Delivers >75° phase margin and <10μs load-step recovery time without external compensation components. |
| 99% maximum duty cycle | Enables dropout operation down to VIN = VOUT + 0.2V, critical for automotive cold-crank scenarios where input drops to 3V. |
| AEC-Q100 Grade 1 | Qualified for -40°C to +125°C junction temperature; includes 42V load-dump tolerance and robust ESD protection (±2kV HBM). |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and upstream fuses during power-up; ramp rate is non-adjustable and factory-set. |
| Integrated current-limit protection | 4.0A (typ) high-side current threshold with valley-current sensing enables accurate overload detection without external sense resistors. |
Applications
| Radar Module Power Supply | ADAS Camera Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoCs requiring clean, low-noise 5V at up to 2.2A with strict EMI limits. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing regulated 5V rail with PGOOD monitoring for system boot validation. Use Value: Spread-spectrum + symmetrical FC2QFN eliminates need for metal shielding cans, reducing BOM cost and board area by 35%. | Use Scenario: Supplies image sensor and ISP core voltage in automotive surround-view cameras operating across temperature extremes. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering 5V with ±1.5% accuracy and 10μA quiescent current in vehicle sleep mode. Use Value: 99% duty cycle maintains regulation during 3V cold-crank events, preventing camera blackouts during engine start. |
| Infotainment System MCU Rail | Automotive Gateway Processor Core |
Use Scenario: Generates 5V for ARM Cortex-A/R-based infotainment head units with dynamic load steps up to 1.8A. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with forced-PWM mode enabled via SYNC pin for consistent EMI profile. Use Value: 2.1MHz switching allows use of 1.5μH inductor and 21μF total output capacitance, shrinking solution size by 40% vs 400kHz alternatives. | Use Scenario: Powers multi-core automotive gateway SoC requiring tight voltage tracking and fast transient response during CAN-FD message bursts. IC Role / Device Role / Timing Role: Precision-regulated 5V source with windowed PGOOD and ±6% spread-spectrum for EMI-sensitive communication subsystems. Use Value: MAXQ architecture achieves <15mV undershoot on 1.5A load step, eliminating need for additional bulk capacitance on processor VDD rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRTWRQ1 | 4.5V–36V input, 5V fixed, 3.5A output, 2.1MHz, no spread spectrum, larger 4mm × 4mm WQFN | Lacks CISPR 25 Class 5 compliance out-of-box; requires external EMI filters for automotive radar use | Select when higher output current (3.5A) is required and board space permits larger package |
| TPS62810-Q1 | 2.7V–6V input, 5V fixed, 2.5A, 2.2MHz, no spread spectrum, no 42V load-dump tolerance | Not rated for 12V/24V automotive main rail; limited to post-regulated 5V domains only | Select only for secondary 5V rails downstream of primary 36V converter; not suitable for direct battery connection |
Compared with LM61480QRTWRQ1 and TPS62810-Q1, the MAX20402AFLA/VY+ uniquely combines AEC-Q100 Grade 1 qualification, 42V load-dump tolerance, integrated spread-spectrum, and symmetrical FC2QFN layout - making it the only option qualified for direct integration into front-end radar and ADAS power stages without supplemental filtering.
Availability
MAX20402AFLA/VY+ is available at Aetrix Electronics and suitable for automotive radar modules, ADAS camera systems, and infotainment head units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX20402AFLA/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 MAX20402/MAX20403 product line was designed specifically for automotive power conversion in safety-critical ADAS and electrification systems, emphasizing ultra-low EMI, wide input range, and AEC-Q100 reliability.
FAQ
What is the maximum input voltage rating for MAX20402AFLA/VY+, and how does it handle load-dump transients?
The MAX20402AFLA/VY+ has an absolute maximum input voltage rating of +42V and is explicitly rated for 42V load-dump transients per ISO 7637-2. Its internal protection circuits clamp and sustain these events without latch-up or degradation, enabling direct connection to automotive 12V or 24V battery rails without external TVS diodes in most designs.
Does MAX20402AFLA/VY+ require external compensation components for stability?
No, MAX20402AFLA/VY+ does not require external compensation components. Its MAXQ® power architecture incorporates factory-optimized internal compensation, delivering >75° phase margin and stable operation with the recommended output capacitance (23μF typ at 2.1MHz) and inductor (1.5μH typ), as validated in the official EV kit design.
How is the PGOOD signal configured on MAX20402AFLA/VY+, and what are its threshold tolerances?
The PGOOD signal on MAX20402AFLA/VY+ is an open-drain output that pulls low when VOUT falls below 93% or rises above 105% of nominal 5V. These thresholds have ±1.25% tolerance over temperature, resulting in guaranteed UV trip at 4.65V (min) and OV trip at 5.25V (max), enabling robust system-level power sequencing in automotive ECUs.
Can MAX20402AFLA/VY+ operate in forced-PWM mode, and how is it enabled?
Yes, MAX20402AFLA/VY+ supports forced-PWM mode. It is enabled by driving the SYNC pin high (≥1.4V), which disables skip mode and locks the converter to its internal 2.1MHz switching frequency regardless of load - ensuring constant EMI signature and eliminating low-frequency beat notes in sensitive RF environments like radar front-ends.
What is the thermal performance of MAX20402AFLA/VY+ on a standard 4-layer evaluation board?
On a 4-layer EV kit board, MAX20402AFLA/VY+ exhibits a junction-to-board thermal resistance (θJB) of 11.7°C/W. At 2.5A output and 14V input, measured junction temperature rise is ≤45°C above ambient, confirming reliable operation within the -40°C to +125°C junction range without forced airflow or heatsinks.
MAX20402AFLA/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:
- 2.5A
- 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)
MAX20402AFLA/VY+ FAQ
1.How can I place an order for MAX20402AFLA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLA/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 MAX20402AFLA/VY+ reliable?
The price and inventory of MAX20402AFLA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20402AFLA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20402AFLA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLA/VY+?
MAX20402AFLA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLA/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 MAX20402AFLA/VY+?
For technical support, including MAX20402AFLA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLA/VY+ requirements.
6.How does Aetrix verify that MAX20402AFLA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLA/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 MAX20402AFLA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20402AFLA/VY+?
All MAX20402AFLA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLA/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 MAX20402AFLA/VY+ part is unused and in its original packaging.
Return procedure for MAX20402AFLA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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