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Analog Devices Inc./Maxim Integrated MAX20402AFLC/VY+
- Part No.:
- MAX20402AFLC/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLC/VY+.pdf
- Description:
- IC REG BUCK 5V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,549
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Product details
Overview
MAX20402AFLC/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 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+ datasheet, MAX20402AFLC/VY+ pinout, MAX20402AFLC/VY+ application, or MAX20402AFLC/VY+ equivalent, key selection considerations include its 400kHz/±6% EMI-optimized operation, 3mm × 3mm FC2QFN package with symmetrical layout for magnetic field cancellation, and integrated high-side/low-side FETs with 95mΩ/45mΩ RDS(ON).
Technical Context
The MAX20402AFLC/VY+ implements average current-mode control with fixed 400kHz internal oscillator and spread-spectrum modulation (±6% Δf), enabling CISPR 25 Class 5 compliance without external filtering. Its MAXQ® power architecture delivers ±1.5% output voltage accuracy in forced-PWM mode and supports 99% duty-cycle operation for low-dropout automotive battery scenarios.
It integrates a 1.8V BIAS LDO, precision enable threshold (2.725V–3.025V UVLO), and windowed PGOOD with 93%–105% detection thresholds. Protection includes overtemperature shutdown (175°C), hiccup-mode short-circuit response, and 42V load-dump tolerance - all validated across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and load-dump (42V transient-tolerant) conditions in automotive systems. |
| Output Voltage | Fixed 5V ±1.5% - factory-trimmed for safety-critical ADAS subsystems requiring stable reference rails. |
| Max Output Current | 2.5A continuous - sufficient for powering radar SoCs, camera ISPs, or domain controllers without external current boosting. |
| Switching Frequency | 400kHz ±10% - enables use of compact 6.8μH inductors and ≥42μF effective output capacitance per Table 2. |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep modes while maintaining fast wake-up capability. |
| Thermal Performance | θJA = 51.1°C/W (4-layer JEDEC board) - allows full 2.5A load at +85°C ambient with minimal heatsinking. |
| EMI Mitigation | Spread-spectrum ±6% + symmetrical FC2QFN pinout - reduces peak radiated emissions by >10dB vs. non-Silent Switcher designs. |
Pinout & Package
MAX20402AFLC/VY+ uses a 15-pin, 3mm × 3mm FC2QFN package with exposed thermal pad (pin 13 = PGND). The symmetrical layout places SUP (pins 3,7), PGND (pins 4,6,13), and LX (pin 5) to minimize loop area and cancel magnetic fields.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | High-voltage enable input | Active-high logic with 2.725V–3.025V UVLO - compatible with 3V–36V battery monitoring without level-shifting. |
| 3,7 SUP | Internal high-side supply input | Dual-supply inputs bypassed separately with 0.1μF + 2.2μF ceramics - critical for EMI suppression and gate-drive stability. |
| 4,6,13 PGND | Power ground terminals | Three dedicated low-impedance PGND pins - reduce ground bounce and improve current-sense accuracy under transient loads. |
| 5 LX | Switch-node connection | Direct inductor tie-point with <35ns minimum on-time - enables high-duty-cycle operation down to 3V input. |
| 9 BST | Bootstrap capacitor node | Connects 0.1μF ceramic between BST–LX - sustains high-side FET gate drive during 99% duty cycle. |
| 10 GND | Analog ground reference | Separate quiet AGND pin - isolates feedback and oscillator circuits from power-switching noise. |
| 11 BIAS | 1.8V internal LDO output | Supplies internal circuitry; requires 2.2μF ceramic to PGND - decouples bias rail from switching transients. |
| 12 SPS | Spread-spectrum enable | Logic-high activates ±6% frequency dither - reduces EMI peaks without affecting regulation or transient response. |
| 13 FB/OUT | Feedback/output sense | Fixed 5V version uses this as output voltage monitor - connects directly to VOUT for accurate PGOOD generation. |
| 14 PGOOD | Open-drain power-good signal | Active-high with 93%–105% window - provides system-level fault indication for microcontroller reset or sequencing logic. |
| 15 SYNC | Mode/synchronization input | Pulled low for skip mode; high for FPWM; accepts external 300–600kHz clock - enables multi-rail synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Symmetrical 3mm × 3mm FC2QFN layout cancels magnetic fields - achieves CISPR 25 Class 5 radiated emissions compliance without shielding cans. |
| MAXQ® power architecture | Optimized phase margin and transient response - delivers ±1.5% output accuracy under 1A/μs load steps without external compensation. |
| 99% dropout operation | Enables regulation down to 3V input at 5V output - supports engine cranking and stop-start systems without brownout. |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a transients - eliminates need for upstream TVS diodes in 12V/24V automotive designs. |
| AEC-Q100 Grade 1 | Qualified from –40°C to +125°C junction - meets reliability requirements for front-end radar, camera, and infotainment ECUs. |
Applications
| Radar Module Power Supply | ADAS Domain Controller Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver SoCs requiring clean, low-noise 5V at up to 2.5A during chirp transmission. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic and RF bias rails with <10mVpp output ripple at 400kHz. Use Value: Spread-spectrum modulation prevents interference with radar IF bands; 99% duty cycle maintains regulation during cold-crank dips. |
Use Scenario: Generates 5V for MCU, CAN FD transceivers, and sensor interfaces in centralized ADAS domain controllers. IC Role / Device Role / Timing Role: System power manager with PGOOD sequencing and SYNC input for synchronized multi-rail startup. Use Value: AEC-Q100 qualification ensures lifetime reliability; dual PGND pins minimize ground shift during CAN bus dominant phases. |
| Automotive Infotainment Head Unit | Industrial High-Voltage DC-DC Converter |
|
Use Scenario: Supplies 5V to display timing controllers and audio codecs in head units with strict EMI limits. IC Role / Device Role / Timing Role: Low-EMI point-of-load regulator using Silent Switcher layout and 400kHz frequency to avoid AM band. Use Value: Symmetrical SUP/PGND pin placement reduces common-mode EMI - passes CISPR 25 Class 5 without ferrite beads. |
Use Scenario: Steps down 24V–36V industrial bus to regulated 5V for PLC I/O modules operating in harsh environments. IC Role / Device Role / Timing Role: Robust DC-DC stage with 42V transient tolerance and thermal shutdown for unregulated input sources. Use Value: 175°C thermal shutdown + 15°C hysteresis prevents latch-up during enclosure overheating; -40°C to +125°C range covers extended temp zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20402AFLA/VY+ | Same 5V/2.5A/FC2QFN but 2.1MHz switching frequency - higher frequency enables smaller inductors (1.5μH vs. 6.8μH) and reduced output capacitance (23μF vs. 42μF). | Better suited for space-constrained radar sensors where PCB area is limited; less optimal for EMI-sensitive infotainment due to higher fundamental frequency. | Select MAX20402AFLA/VY+ when board area is critical and EMI filtering can be added; retain MAX20402AFLC/VY+ for cost-sensitive, EMI-limited applications needing 400kHz fundamental. |
| LM61480QRNXTQ1 | TI's AEC-Q100 36V/5A buck with 2.1MHz/400kHz selectable frequency, but no spread-spectrum and larger 4mm × 4mm VQFN package. | Lacks Silent Switcher EMI cancellation - requires additional filtering to meet CISPR 25 Class 5; higher current rating suits heavier loads but increases solution size. | Choose LM61480QRNXTQ1 only if >2.5A output is required and EMI can be managed externally; MAX20402AFLC/VY+ remains superior for integrated low-EMI 2.5A solutions. |
Compared with MAX20402AFLA/VY+, MAX20402AFLC/VY+ trades higher-frequency efficiency for lower EMI and relaxed output capacitor requirements; versus LM61480QRNXTQ1, it delivers superior radiated emissions performance in a smaller footprint despite lower current rating.
Availability
MAX20402AFLC/VY+ is available at Aetrix Electronics and suitable for automotive radar modules, ADAS domain controllers, and industrial high-voltage DC-DC converters requiring stable component supply with AEC-Q100 assurance and long-term production continuity.
Supply support for MAX20402AFLC/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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving automotive, industrial, communications, and healthcare markets since 1965.
The MAX20402/MAX20403 family was designed specifically for automotive power management in safety-critical ADAS and infotainment systems, emphasizing ultra-low EMI, wide input range, and AEC-Q100 reliability.
FAQ
What is the maximum input voltage transient tolerance for MAX20402AFLC/VY+?
MAX20402AFLC/VY+ withstands 42V transients per ISO 7637-2 Pulse 5a, confirmed in Absolute Maximum Ratings. This eliminates need for external TVS protection in 12V/24V automotive systems. The device self-protects against ≤50ns transients exceeding absolute max ratings under normal load, and operates continuously up to 36V nominal input. Its 42V tolerance applies to SUP, EN, and BST pins.
Does MAX20402AFLC/VY+ support external frequency synchronization?
Yes, MAX20402AFLC/VY+ accepts external clock signals on the SYNC pin within 300–600kHz for 400kHz operation. When an external clock is applied, the IC synchronizes within two cycles at the rising edge. If the external clock is absent for more than two cycles, MAX20402AFLC/VY+ automatically reverts to its internal 400kHz oscillator - ensuring seamless fallback without system interruption.
How does the spread-spectrum feature affect output voltage regulation in MAX20402AFLC/VY+?
The spread-spectrum feature in MAX20402AFLC/VY+ modulates switching frequency by ±6% around 400kHz using a triangular waveform (1.25ms period), reducing peak radiated emissions without impacting regulation. Output voltage accuracy remains ±1.5% in FPWM mode, and PGOOD window (93%–105%) is unaffected - confirming that spectral dithering does not degrade DC performance or transient response.
What is the purpose of the dual SUP pins (pins 3 and 7) on MAX20402AFLC/VY+?
The dual SUP pins on MAX20402AFLC/VY+ enable symmetrical input capacitor placement - each requires its own 0.1μF + 2.2μF ceramic bypass stack placed adjacent to the pin. This balanced layout minimizes high-frequency loop area, reduces common-mode EMI, and improves gate-drive stability during high di/dt switching events, directly supporting CISPR 25 Class 5 compliance.
Can MAX20402AFLC/VY+ operate in dropout mode, and what is the minimum input voltage for 5V output?
Yes, MAX20402AFLC/VY+ operates in dropout mode at up to 99% duty cycle, allowing regulation with input as low as 5.05V (5V ÷ 0.99) for 5V output. This supports automotive cold-crank scenarios where battery voltage drops to 3V - though output current must be reduced per derating curves. At 3V input, MAX20402AFLC/VY+ maintains regulation only at light loads (<200mA) due to duty-cycle limitation.
MAX20402AFLC/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:
- 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+ FAQ
1.How can I place an order for MAX20402AFLC/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLC/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 MAX20402AFLC/VY+ reliable?
The price and inventory of MAX20402AFLC/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20402AFLC/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLC/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLC/VY+?
MAX20402AFLC/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLC/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 MAX20402AFLC/VY+?
For technical support, including MAX20402AFLC/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLC/VY+ requirements.
6.How does Aetrix verify that MAX20402AFLC/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLC/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 MAX20402AFLC/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20402AFLC/VY+?
All MAX20402AFLC/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLC/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 MAX20402AFLC/VY+ part is unused and in its original packaging.
Return procedure for MAX20402AFLC/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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