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Analog Devices Inc./Maxim Integrated MAX20402AFLC/VY+T
- Part No.:
- MAX20402AFLC/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLC/VY+T.pdf
- Description:
- IC REG BUCK 5V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,601
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Product details
Overview
MAX20402AFLC/VY+T 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 400kHz fixed switching frequency, ±6% spread-spectrum modulation, 99% dropout duty cycle, and AEC-Q100 qualification for radar modules and ADAS power rails.
For engineers reviewing the MAX20402AFLC/VY+T datasheet, MAX20402AFLC/VY+T pinout, MAX20402AFLC/VY+T application, or MAX20402AFLC/VY+T equivalent, key selection criteria include its 400kHz/2.1MHz/3MHz frequency options, 10μA no-load quiescent current in skip mode, ±1.5% output voltage accuracy in FPWM, 3mm × 3mm FC2QFN package, and 42V load-dump tolerance for harsh automotive environments.
Technical Context
The MAX20402AFLC/VY+T implements average current-mode control with MAXQ® power architecture for precision transient response and phase margin optimization. Its internal 400kHz oscillator supports spread-spectrum modulation (±6%) and external synchronization via SYNC pin, enabling EMI reduction without compromising regulation stability.
It integrates high-side (95–165mΩ) and low-side (45–85mΩ) DMOS FETs, a 1.8V BIAS LDO, and a 2.5ms fixed soft-start ramp. Protection includes overtemperature shutdown (175°C), hiccup-mode short-circuit response, and accurate windowed PGOOD with 93% UV / 105% OV thresholds.
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 Current | 2.5A continuous - sufficient for powering SoCs, sensors, and interface ICs in ADAS ECUs. |
| Switching Frequency | 400kHz - enables use of compact 6.8μH inductors and ≥34μF effective output capacitance for stable regulation. |
| Output Voltage | Fixed 5V ±1.5% - eliminates external feedback resistors and simplifies layout for noise-sensitive applications. |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep modes without compromising wake-up responsiveness. |
| Thermal Performance | θJA = 40.6°C/W on EV kit - ensures reliable operation up to +125°C ambient in enclosed junction boxes. |
| EMI Mitigation | Spread-spectrum ±6% - reduces peak radiated emissions to meet CISPR 25 Class 5 requirements without shielding. |
Pinout & Package
The MAX20402AFLC/VY+T is housed in a 15-pin, 3mm × 3mm FC2QFN package with exposed thermal pad (F153B3FY+1). Symmetrical SUP/PGND pin arrangement minimizes loop inductance and enhances EMI cancellation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-tolerant (up to 42V) logic enable - allows direct connection to battery or ignition signal without level-shifting. |
| SUP (Pins 3,7) | High-side supply input | Dual-supply path for gate drivers - requires symmetric 0.1μF + 2.2μF ceramic bypass per pin to suppress high-frequency ripple. |
| PGND (Pins 4,6) | Power ground | Separate low-impedance return for high-current LX switching - must be tied directly to thermal pad and input/output capacitors. |
| LX (Pin 5) | Switch node | Connection to inductor switch node - demands minimal trace area and shortest possible routing to reduce dv/dt noise and EMI. |
| BST (Pin 9) | Bootstrap capacitor terminal | Drives high-side FET gate - requires 0.1μF ceramic capacitor placed adjacent to BST/LX pins to sustain gate voltage during 99% duty cycle. |
| BIAS (Pin 11) | Internal 1.8V LDO output | Powers internal analog circuitry - requires ≥2.2μF ceramic capacitor to PGND for stability and low-noise biasing. |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high activates ±6% frequency dither - critical for passing CISPR 25 radiated emissions tests in automotive EMC validation. |
| FB/OUT (Pin 13) | Output voltage sense | Fixed 5V version uses this as output monitor - connects directly to VOUT for accurate PGOOD generation and regulation feedback. |
| PGOOD (Pin 14) | Open-drain status output | Active-high power-good signal - requires external 20kΩ pull-up to BIAS or system rail to indicate valid 5V output within ±7% window. |
| SYNC (Pin 15) | Mode control & sync input | Pulled low for skip mode (10μA IQ); pulled high for FPWM; accepts external clock up to 2.6MHz for system-level timing alignment. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop, symmetrical pinout cancels magnetic fields - achieves >30dB lower peak EMI vs. conventional buck converters. |
| MAXQ® power architecture | Optimized phase margin and transient response - delivers <100mV output deviation under 2A step load with 2.5ms soft-start. |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a transients - eliminates need for external TVS diodes in 12V/24V automotive power supplies. |
| AEC-Q100 Grade 1 | Qualified from −40°C to +125°C ambient - validated for engine bay and radar module mounting locations with no derating. |
| 99% dropout operation | Maintains regulation down to VIN = VOUT + 0.2V - enables uninterrupted operation during cranking when battery drops to 6V while supplying 5V to vision processors. |
Applications
| Radar Module Power Supply | ADAS Domain Controller Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ASICs requiring clean, stable 5V at up to 2.5A with minimal conducted/radiated noise. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 12V vehicle battery to isolated 5V domain rail with PGOOD sequencing and EMI suppression. Use Value: Spread-spectrum modulation and Silent Switcher layout reduce radiated emissions below CISPR 25 Class 5 limits, avoiding costly shielded enclosures. | Use Scenario: Supplies power to automotive Ethernet switches and microcontrollers in centralized ADAS domain controllers operating across temperature extremes. IC Role / Device Role / Timing Role: High-reliability point-of-load converter with AEC-Q100 qualification and 42V transient protection for safety-critical subsystems. Use Value: 99% duty cycle maintains 5V output during cold-crank events (6V battery), ensuring uninterrupted CAN/Ethernet communication during engine start. |
| Infotainment Head Unit Core Rail | Automotive Camera ECU Power |
Use Scenario: Generates 5V for application processors and display interfaces in head units where audio/video performance is sensitive to power rail noise. IC Role / Device Role / Timing Role: Low-EMI buck converter with fixed 5V output and ultra-low 10μA quiescent current in skip mode for extended parking mode. Use Value: 400kHz switching frequency enables small 6.8μH inductor and 42μF output capacitance - minimizing board space while meeting ripple <20mVpp. | Use Scenario: Powers image signal processors and MIPI interfaces in surround-view camera ECUs mounted near wheel wells. IC Role / Device Role / Timing Role: Automotive-qualified DC-DC with thermal shutdown (175°C) and hiccup-mode short-circuit protection for harsh under-hood environments. Use Value: FC2QFN package with exposed thermal pad dissipates heat efficiently at +125°C ambient - eliminates need for heatsinks in compact camera housings. |
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, 8A output, 2.1MHz fixed frequency, no spread spectrum, 15μA IQ in Eco-mode | Higher current capability but larger solution size; lacks CISPR 25 Class 5 compliance out-of-box | Select when higher output current (>2.5A) is required and EMI filtering can be added externally. |
| TPS62810-Q1 | 2.7V–6V input, 1A output, 2.25MHz/3.6MHz selectable, 1.2μA IQ in deep sleep, no load-dump tolerance | Designed for low-voltage domains only; unsuitable for direct 12V/24V battery input or load-dump stress | Select only for post-regulated 5V rails downstream of primary 36V buck, not for direct battery connection. |
Compared with LM61480QRNXTQ1 and TPS62810-Q1, the MAX20402AFLC/VY+T uniquely combines 400kHz operation for low-noise design, built-in spread-spectrum EMI reduction, 42V load-dump tolerance, and AEC-Q100 Grade 1 qualification - making it the optimal choice for first-stage 5V conversion in radar, ADAS, and infotainment systems.
Availability
MAX20402AFLC/VY+T is available at Aetrix Electronics and suitable for automotive radar modules, ADAS domain controllers, and infotainment head units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX20402AFLC/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 product line was designed specifically for automotive power management in safety-critical ADAS and electrification systems, emphasizing ultra-low EMI, wide-input operation, and robust transient handling.
FAQ
What is the maximum input voltage the MAX20402AFLC/VY+T can withstand during load-dump events?
The MAX20402AFLC/VY+T is rated for 42V absolute maximum input voltage and is explicitly designed to survive ISO 7637-2 Pulse 5a load-dump transients without external protection. This 42V rating applies to short-duration transients (≤1s), enabling direct connection to 12V or 24V automotive batteries without additional TVS clamping components. The device remains functional and undamaged under these conditions, as verified in AEC-Q100 stress testing.
Does the MAX20402AFLC/VY+T support external frequency synchronization?
Yes, the MAX20402AFLC/VY+T supports external clock synchronization via the SYNC pin. When an external clock signal is applied within the specified range (300–600kHz for 400kHz internal mode), the device synchronizes to it within two cycles at the rising edge. If the external clock is lost for more than two cycles, the MAX20402AFLC/VY+T automatically reverts to its internal 400kHz oscillator. This feature enables deterministic timing alignment across multiple power rails in complex ADAS systems.
What is the output voltage accuracy of the MAX20402AFLC/VY+T in forced-PWM mode?
In forced-PWM (FPWM) mode, the MAX20402AFLC/VY+T delivers ±1.5% output voltage accuracy over the full operating temperature range of −40°C to +125°C. This specification is guaranteed for the fixed 5V output version and is measured under typical load conditions with proper PCB layout and decoupling. The accuracy is maintained by the MAXQ® architecture's precision error amplifier and stable reference, ensuring reliable operation in safety-critical automotive applications.
How does the MAX20402AFLC/VY+T achieve low EMI performance without external filters?
The MAX20402AFLC/VY+T achieves low EMI through three integrated techniques: (1) Silent Switcher® symmetrical pinout that cancels magnetic field emissions, (2) spread-spectrum frequency modulation (±6%) that spreads energy across a bandwidth, and (3) optimized internal gate drive timing that minimizes dv/dt and di/dt slew rates. These features collectively enable compliance with CISPR 25 Class 5 radiated emissions limits using only standard PCB layout - no ferrite beads, common-mode chokes, or metal shielding required.
What thermal protection mechanisms are implemented in the MAX20402AFLC/VY+T?
The MAX20402AFLC/VY+T incorporates thermal shutdown that activates at +175°C junction temperature, with 15°C hysteresis to prevent oscillation. Upon shutdown, the converter disables both high-side and low-side FETs and enters a low-power state until the die cools to +160°C. Additionally, the device uses average current-mode control with internal slope compensation to prevent subharmonic oscillation under high duty-cycle conditions - a key thermal stress factor in automotive dropout operation. These protections are fully integrated and require no external components.
MAX20402AFLC/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):
- 5V
- 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)
MAX20402AFLC/VY+T FAQ
1.How can I place an order for MAX20402AFLC/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLC/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 MAX20402AFLC/VY+T reliable?
The price and inventory of MAX20402AFLC/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 MAX20402AFLC/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20402AFLC/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLC/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLC/VY+T?
MAX20402AFLC/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLC/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 MAX20402AFLC/VY+T?
For technical support, including MAX20402AFLC/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLC/VY+T requirements.
6.How does Aetrix verify that MAX20402AFLC/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLC/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 MAX20402AFLC/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20402AFLC/VY+T?
All MAX20402AFLC/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLC/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 MAX20402AFLC/VY+T part is unused and in its original packaging.
Return procedure for MAX20402AFLC/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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