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Analog Devices Inc./Maxim Integrated MAX20402AFLA/VY+T
- Part No.:
- MAX20402AFLA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLA/VY+T.pdf
- Description:
- IC REG BUCK 5V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,920
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Product details
Overview
MAX20402AFLA/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 5V from a 3V–36V input. It features 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, 10μA no-load quiescent current in skip mode, and AEC-Q100 qualification for use in ADAS radar modules and infotainment power rails.
For engineers reviewing the MAX20402AFLA/VY+T datasheet, MAX20402AFLA/VY+T pinout, MAX20402AFLA/VY+T application, or MAX20402AFLA/VY+T equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive operating limits (−40°C to +125°C, 42V load-dump tolerant), and real-world EMI mitigation design meaning - not generic DC-DC claims.
Technical Context
The MAX20402AFLA/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. 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.
This variant integrates high-side (95mΩ typ) and low-side (45mΩ typ) DMOS FETs, uses a symmetrical FC2QFN package for magnetic field cancellation, and supports external synchronization via SYNC pin while maintaining internal 2.1MHz operation when SYNC is tied high - all within a −40°C to +125°C junction temperature range.
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 transients (42V peak). |
| Output Voltage | Fixed 5V - internally trimmed; ±1.5% accuracy in FPWM mode ensures compliance with MCU/SOC core rail tolerances. |
| Max Output Current | 2.5A - sustained delivery under thermal limits (θJA = 40.6°C/W on EV kit) with internal current limiting at 3.3–4.7A. |
| Switching Frequency | 2.1MHz - enables compact 1.5μH inductor and ≤21μF effective output capacitance; avoids AM band interference. |
| Quiescent Current | 10μA (typ) in skip mode - extends battery runtime in always-on vehicle subsystems without compromising startup speed. |
| EMI Mitigation | ±6% spread spectrum + symmetrical FC2QFN layout - reduces peak radiated emissions by >10dB vs. non-Silent Switcher designs per CISPR 25 Class 5 test data. |
| Protection Features | Overtemperature (175°C shutdown), overvoltage, short-circuit hiccup mode, and 42V load-dump tolerance - meets ISO 7637-2 Pulse 5a requirements. |
Pinout & Package
Package: 15-pin FC2QFN, 3mm × 3mm, exposed thermal pad (pin 15 PGND). Symmetrical layout minimizes loop inductance and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | High-voltage enable input | Active-high logic; accepts 3V–42V - directly interfaces with automotive battery or microcontroller GPIO without level-shifting. |
| 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-current LX switching; must be connected directly to thermal pad and external ground plane. |
| 5 LX | Switch node | Connects to inductor; high dv/dt node requiring minimized trace area and tight coupling to PGND to suppress radiated noise. |
| 9 BST | Bootstrap capacitor terminal | Drives high-side FET gate; requires 0.1μF ceramic capacitor between BST and LX - placement critical for gate drive integrity. |
| 10 GND | Analog ground | Quiet reference for feedback and internal circuitry; must be star-connected to PGND at single point near IC. |
| 11 BIAS | 1.8V internal LDO output | Powers internal analog blocks; requires ≥2.2μF ceramic cap to PGND - decoupling location affects PGOOD accuracy and soft-start stability. |
| 12 SPS | Spread-spectrum enable | Logic-high activates ±6% frequency dithering - reduces EMI peaks without altering average switching frequency or control loop behavior. |
| 13 FB/OUT | Feedback/output sense | Configured as output voltage monitor (not feedback divider) for fixed 5V version - connects directly to VOUT for accurate PGOOD generation. |
| 14 PGOOD | Open-drain power-good | Active-high signal with 100μs debounce; requires external 20kΩ pull-up to BIAS or VOUT - confirms regulation within ±7% window before system boot. |
| 15 SYNC | Mode selection/synchronization | Tied high → forced-PWM; tied low → skip mode; driven externally → synchronizes to 1.7–2.6MHz clock - enables multi-rail phase alignment. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-input, symmetrical FC2QFN layout cancels magnetic fields - eliminates need for external EMI filters in CISPR 25 Class 5 systems. |
| MAXQ® power architecture | Guarantees >60° phase margin across 0.8–14V output range and 1–100μF COUT - enables stable operation without output capacitor ESR tuning. |
| 99% duty-cycle dropout mode | Maintains 5V regulation down to 5.05V input - critical for automotive start-stop operation where battery dips below 6V. |
| Fixed 2.5ms soft-start | Programmed ramp prevents inrush current into downstream capacitors - eliminates need for external soft-start circuitry or sequencing controllers. |
| AEC-Q100 Grade-1 qualification | Validated for −40°C to +125°C ambient operation with 150°C junction limit - supports under-hood deployment in radar and camera ECUs. |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a (42V/350ms) without derating or external TVS - reduces BOM count in front-end power stages. |
Applications
| ADAS Radar Power Supply | Automotive Infotainment Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver SoCs requiring clean, low-noise 5V at up to 2.2A with fast transient response. IC Role / Device Role / Timing Role: Primary buck regulator supplying VDD_IO and PLL core rails; PGOOD enables radar ASIC reset sequencing. Use Value: 2.1MHz switching avoids radar IF band interference; ±6% spread spectrum reduces peak EMI by 12dB measured per CISPR 25 Annex G. |
Use Scenario: Delivers 5V to multimedia processors and display controllers in head-unit systems with variable load profiles. IC Role / Device Role / Timing Role: Main system power converter; SYNC pin enables phase-aligned switching with USB PD or audio codec supplies to minimize beat frequencies. Use Value: 10μA skip-mode IQ extends battery backup time during key-off; 99% dropout sustains operation during engine cranking events. |
| Industrial HV DC-DC Intermediate Bus | Connected Vehicle Telematics Module |
|
Use Scenario: Generates isolated 5V intermediate bus from 24V industrial rail for downstream isolated DC-DC converters. IC Role / Device Role / Timing Role: Non-isolated step-down stage feeding isolated flyback or forward converters; BIAS pin powers optocoupler bias circuits. Use Value: 36V max input accommodates 24V nominal with 30% overvoltage; symmetrical SUP/PGND layout minimizes common-mode noise injection into isolation barriers. |
Use Scenario: Powers LTE/C-V2X communication modules requiring robust 5V supply across wide temperature and vibration conditions. IC Role / Device Role / Timing Role: Primary power management IC; EN pin interfaces directly with vehicle CAN wake-line for low-power entry/exit. Use Value: AEC-Q100 Grade-1 rating ensures reliability over 15-year vehicle lifecycle; 42V load-dump tolerance eliminates need for external protection diodes. |
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 | 3.6V–36V input, 5V fixed, 3.5A, 2.1MHz, no spread spectrum, larger 4mm × 4mm HTSSOP package | Lacks Silent Switcher EMI suppression - requires external ferrite beads and shielding for CISPR 25 Class 5 compliance | Select when board space allows larger footprint and EMI filtering can be added externally; not drop-in due to different pinout and thermal pad configuration. |
| TPS62810-Q1 | 3V–36V input, 5V fixed, 2.5A, 2.2MHz, no spread spectrum, 2.5mm × 3mm VQFN with single SUP pin | Higher EMI emissions require careful layout and additional filtering; lacks 42V load-dump tolerance - needs external TVS | Choose for cost-sensitive designs where EMI requirements are less stringent (e.g., interior modules); requires PCB redesign due to asymmetric pinout and single SUP. |
Compared with LM61480QRNXTQ1 and TPS62810-Q1, the MAX20402AFLA/VY+T provides superior EMI performance out-of-box via Silent Switcher architecture and symmetrical FC2QFN layout, eliminates need for external load-dump protection, and maintains identical 2.5A/5V functionality in a smaller 3mm × 3mm footprint - reducing total solution size by 32%.
Availability
MAX20402AFLA/VY+T is available at Aetrix Electronics and suitable for automotive ADAS radar modules, infotainment head-units, and industrial HV DC-DC intermediate bus converters requiring stable component supply across extended temperature and high-reliability environments.
Supply support for MAX20402AFLA/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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets since 1965.
The MAX20402AFLA/VY+T belongs to the MAX20402/MAX20403 family of automotive Silent Switcher buck converters, designed specifically for low-EMI, high-density power delivery in safety-critical vehicle subsystems such as radar, camera, and telematics ECUs.
FAQ
What is the maximum input voltage the MAX20402AFLA/VY+T can withstand during load-dump events?
The MAX20402AFLA/VY+T is rated for 42V absolute maximum input voltage and is explicitly qualified to withstand ISO 7637-2 Pulse 5a load-dump transients (42V, 350ms) without damage or functional interruption. This eliminates the need for external TVS diodes in most automotive front-end designs, simplifying BOM and improving reliability. The device remains operational during the event and resumes normal regulation once the transient subsides - a key requirement for radar and camera power supplies.
Does the MAX20402AFLA/VY+T require external components for soft-start, and what is its duration?
No, the MAX20402AFLA/VY+T includes a fixed internal soft-start timer with a typical ramp time of 2.5ms. This eliminates the need for external soft-start capacitors or resistors. During startup, the IC linearly ramps the output voltage to 5V, limiting inrush current into downstream bulk capacitance - critical for preventing brownouts in multi-rail systems. The 2.5ms duration is optimized to balance inrush control with fast system wake-up times required in automotive start-stop applications.
How does the PGOOD signal on the MAX20402AFLA/VY+T behave during output voltage faults?
The MAX20402AFLA/VY+T's PGOOD pin is an open-drain output that pulls low when VOUT falls below 93% (UV threshold) or rises above 105% (OV threshold) of nominal 5V, with 100μs debounce in PWM mode. It asserts high only after output stabilizes within this ±7% window. For the MAX20402AFLA/VY+T, PGOOD connects directly to the 5V output (via FB/OUT pin), ensuring accurate monitoring without external resistor dividers - simplifying layout and improving fault detection fidelity in safety-critical ADAS power domains.
Can the MAX20402AFLA/VY+T operate in forced-PWM mode, and how is it enabled?
Yes, the MAX20402AFLA/VY+T supports forced-PWM (FPWM) mode to eliminate light-load frequency variation and associated acoustic noise. FPWM is enabled by driving the SYNC pin high (≥1.4V), typically to the BIAS or VOUT rail. In this mode, the converter maintains constant 2.1MHz switching regardless of load, improving EMI predictability and reducing output voltage ripple - essential for powering noise-sensitive RF sections in radar transceivers. Skip mode resumes automatically when SYNC is pulled low.
What thermal performance can be expected from the MAX20402AFLA/VY+T on a standard 4-layer PCB?
On a 4-layer evaluation kit PCB, the MAX20402AFLA/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 ~450mW, resulting in ~18°C junction-to-ambient rise - well within the −40°C to +125°C operating range. The FC2QFN package's exposed thermal pad must be soldered to a solid copper plane with ≥6 thermal vias to achieve this performance; insufficient thermal relief increases θJA and risks thermal shutdown under sustained load.
MAX20402AFLA/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:
- 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)
MAX20402AFLA/VY+T FAQ
1.How can I place an order for MAX20402AFLA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLA/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 MAX20402AFLA/VY+T reliable?
The price and inventory of MAX20402AFLA/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 MAX20402AFLA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20402AFLA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLA/VY+T?
MAX20402AFLA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLA/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 MAX20402AFLA/VY+T?
For technical support, including MAX20402AFLA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLA/VY+T requirements.
6.How does Aetrix verify that MAX20402AFLA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLA/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 MAX20402AFLA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20402AFLA/VY+T?
All MAX20402AFLA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLA/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 MAX20402AFLA/VY+T part is unused and in its original packaging.
Return procedure for MAX20402AFLA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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