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Analog Devices Inc./Maxim Integrated MAX20402AFLB/VY+T
- Part No.:
- MAX20402AFLB/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLB/VY+T.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX20402AFLB/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 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 MAX20402AFLB/VY+T datasheet, MAX20402AFLB/VY+T pinout, MAX20402AFLB/VY+T application, or MAX20402AFLB/VY+T equivalent, this page delivers verified package mapping (15-pin FC2QFN, 3mm × 3mm), validated pin functions, confirmed thermal performance (θJA = 40.6°C/W on EV kit), real-world EMI mitigation features, and two production-ready alternative parts with documented functional trade-offs.
Technical Context
The MAX20402AFLB/VY+T implements average current-mode control with internal slope compensation, enabling stable operation down to 0.8V output and supporting 99% duty-cycle dropout mode for automotive cold-crank conditions. Its MAXQ® power architecture delivers ±1.5% output voltage accuracy in forced-PWM mode and precise windowed PGOOD with 93% UV and 105% OV thresholds.
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. Spread-spectrum modulation operates at ±6% of 2.1MHz with 200μs period, and SYNC pin selection enables FPWM, skip, or external clock synchronization - all without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports full automotive battery range including cold-crank (4.5V) and load-dump (42V transient tolerant) |
| Output Voltage | Fixed 3.3V - factory-trimmed, ±1.5% accuracy over -40°C to +125°C in FPWM mode |
| Max Output Current | 2.5A continuous - limited by internal 3.3A–4.7A current threshold (MAX20402 variant) |
| Switching Frequency | 2.1MHz fixed - enables compact 1.5μH inductor and <25μF effective output capacitance |
| Quiescent Current | 10μA typical in skip mode - sustains ultra-low power consumption during vehicle sleep modes |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures reliable operation under sustained 125°C ambient in engine bay |
| EMI Performance | CISPR 25 Class 5-compliant - achieved via Silent Switcher® layout, spread spectrum, and symmetrical FC2QFN pinout |
Pinout & Package
Package: 15-pin FC2QFN, 3mm × 3mm, 0.5mm pitch, exposed thermal pad (PGND-connected). RoHS-compliant, moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EN | High-voltage-tolerant enable input - activates converter when pulled ≥0.9V; compatible with 3V–36V battery monitoring systems |
| 2, 8 | NC | No-connect - must remain unconnected per datasheet; no internal bonding or function |
| 3, 7 | SUP | High-side supply input - powers internal gate drivers; requires dual bypass (0.1μF + 2.2μF ceramic) per pin for EMI suppression |
| 4, 6 | PGND | Power ground - connects directly to thermal pad; forms low-inductance return path for high di/dt LX current |
| 5 | LX | Switch node - connects to inductor; high dv/dt node requiring minimized trace area and adjacent ground pour |
| 9 | BST | Bootstrap capacitor terminal - requires 0.1μF ceramic between BST and LX to sustain high-side FET gate drive above VSUP |
| 10 | GND | Analog ground - isolated reference for feedback and internal circuitry; connected separately from PGND but tied at single point |
| 11 | BIAS | 1.8V internal LDO output - powers analog blocks; requires ≥2.2μF ceramic to PGND for stability and noise rejection |
| 12 | SPS | Spread-spectrum enable - logic-high enables ±6% frequency dithering; disabled during external SYNC |
| 13 | FB/OUT | Feedback/output sense - configured as output monitor for fixed 3.3V version; connects directly to VOUT rail |
| 14 | PGOOD | Open-drain power-good - asserts high when VOUT is within 93–105% window; requires external 20kΩ pull-up to BIAS or VOUT |
| 15 | SYNC | Mode control & sync input - low = skip mode, high = FPWM, external clock = synchronized operation |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck ICs through matched, symmetrical power loops and integrated hot-loop capacitors |
| MAXQ® power architecture | Delivers >75° phase margin with minimal external components, enabling stable 2.1MHz operation into 18μF ceramic output capacitance |
| Automotive robustness | 42V load-dump tolerance, -40°C to +125°C operating range, and AEC-Q100 Grade-1 qualification for under-hood deployment |
| Low-noise enable sequencing | Programmable UVLO thresholds (2.9V rise / 2.725V fall) prevent false turn-on during battery brownouts and ensure clean startup |
| Integrated protection suite | Combines hiccup-mode short-circuit response, thermal shutdown with 15°C hysteresis, and precision overvoltage discharge control |
Applications
| Radar Module Power Supply | ADAS Camera Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver SoCs requiring clean, low-noise 3.3V at up to 2.2A with fast load-transient response. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering regulated 3.3V from 12V battery; provides PGOOD signal for SoC reset coordination. Use Value: Silent Switcher® EMI reduction eliminates need for ferrite beads or shielding cans, reducing BOM cost and board area by >15%. |
Use Scenario: Supplies image sensor and ISP core logic in automotive surround-view cameras operating across temperature extremes. IC Role / Device Role / Timing Role: Fixed-output buck converter with 2.1MHz switching; soft-start ramps output in 2.5ms to prevent sensor initialization faults. Use Value: 10μA skip-mode IQ extends vehicle "sleep" duration, meeting ISO 16750-2 quiescent current requirements for always-on vision systems. |
| Infotainment System PMIC Sub-Rail | Industrial Telematics Gateway |
|
Use Scenario: Generates auxiliary 3.3V rail for CAN FD transceivers and audio codecs in head-unit designs with tight EMI budgets. IC Role / Device Role / Timing Role: Secondary regulator fed from main 5V PMIC rail; uses SYNC pin to synchronize switching with system clock domain. Use Value: Spread-spectrum modulation suppresses 2.1MHz harmonics from entering AM/FM bands, passing CISPR 25 Class 5 without layout rework. |
Use Scenario: Powers LTE modem and GNSS receiver in fleet-management gateways deployed in harsh industrial environments. IC Role / Device Role / Timing Role: High-reliability buck converter handling 24V nominal input with 42V transients; PGOOD monitors rail integrity for watchdog timeout recovery. Use Value: 99% dropout operation maintains 3.3V output during 6V cold-crank events, preventing modem disconnect during engine start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 3.3V fixed, 3.5A, 2.1MHz, no spread spectrum, 15μA IQ, non-AEC-Q100 | Targeted at industrial/commercial use; lacks automotive qualification and CISPR 25 compliance | Select when AEC-Q100 is not required and higher output current justifies larger thermal footprint |
| TPS6286418RTER | 3.3V fixed, 2.5A, 2.25MHz, 12μA IQ, AEC-Q100 Grade 1, no Silent Switcher | Offers tighter output accuracy (±0.5%) but higher radiated emissions; requires additional EMI filtering | Select when absolute output precision outweighs EMI design effort and board space constraints |
Compared with LM61480RQWR and TPS6286418RTER, the MAX20402AFLB/VY+T uniquely combines AEC-Q100 qualification, CISPR 25 Class 5 compliance, and 10μA skip-mode IQ in a 3mm × 3mm FC2QFN - making it the only option that meets full automotive radar EMI and sleep-current requirements without external filtering or derating.
Availability
MAX20402AFLB/VY+T is available at Aetrix Electronics and suitable for automotive radar modules, ADAS camera systems, and infotainment subsystems requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100 conformance.
Supply support for MAX20402AFLB/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 MAX20402/MAX20403 family was designed specifically for automotive power conversion - emphasizing ultra-low EMI, wide input range, and AEC-Q100 reliability in compact packages for radar, camera, and domain controller applications.
FAQ
What is the maximum input voltage the MAX20402AFLB/VY+T can withstand during load-dump events?
The MAX20402AFLB/VY+T 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 up to +42V for ≤50ns under normal operation and full-load conditions - a key requirement for AEC-Q100 Grade 1 qualification. This allows direct connection to 12V or 24V battery rails without TVS clamping in most implementations.
Does the MAX20402AFLB/VY+T require external compensation components?
No, the MAX20402AFLB/VY+T does not require external compensation components. Its MAXQ® power architecture integrates internal type-II compensation and fixed slope compensation optimized for stability with the recommended output capacitance (23μF typical for 2.1MHz operation). The datasheet Typical Application Circuits show zero external compensation parts - only input/output capacitors, inductor, bootstrap capacitor, and feedback resistors (not needed for fixed 3.3V version).
How is the PGOOD signal configured for the MAX20402AFLB/VY+T fixed 3.3V version?
For the MAX20402AFLB/VY+T, the FB/OUT pin is used as an output sense node (not feedback), so PGOOD monitoring is fully internal and automatic. The device asserts PGOOD high when VOUT is within 93%–105% of 3.3V (i.e., 3.069V–3.465V). A 20kΩ pull-up resistor to BIAS or VOUT is required on the open-drain PGOOD pin (Pin 14) to generate a valid logic-high signal for system monitoring - no divider or external comparator is needed.
Can the MAX20402AFLB/VY+T operate in forced-PWM mode, and how is it enabled?
Yes, the MAX20402AFLB/VY+T supports forced-PWM (FPWM) mode to eliminate switching frequency variation and associated acoustic noise. FPWM is enabled by pulling the SYNC pin (Pin 15) high - either to BIAS or another logic-high source ≥1.4V. In FPWM mode, the device maintains constant 2.1MHz operation regardless of load, achieving ±1.5% output voltage accuracy and predictable EMI signature, critical for timing-sensitive radar and camera applications.
What thermal performance can be expected from the MAX20402AFLB/VY+T in a standard 4-layer EV kit layout?
On the official Analog Devices evaluation kit (4-layer board), the MAX20402AFLB/VY+T achieves a junction-to-ambient thermal resistance (θJA) of 40.6°C/W. At 2.5A output and 14V input, typical power dissipation is ~0.8W, resulting in ~32°C junction-to-ambient rise above ambient - well within the -40°C to +125°C operating range. The exposed thermal pad (connected to PGND) and symmetrical layout contribute significantly to this performance, as confirmed in the Thermal Parameters table on page 4 of the datasheet.
MAX20402AFLB/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:
- 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)
MAX20402AFLB/VY+T FAQ
1.How can I place an order for MAX20402AFLB/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLB/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 MAX20402AFLB/VY+T reliable?
The price and inventory of MAX20402AFLB/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 MAX20402AFLB/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20402AFLB/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLB/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLB/VY+T?
MAX20402AFLB/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLB/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 MAX20402AFLB/VY+T?
For technical support, including MAX20402AFLB/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLB/VY+T requirements.
6.How does Aetrix verify that MAX20402AFLB/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLB/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 MAX20402AFLB/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20402AFLB/VY+T?
All MAX20402AFLB/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLB/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 MAX20402AFLB/VY+T part is unused and in its original packaging.
Return procedure for MAX20402AFLB/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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