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Analog Devices Inc./Maxim Integrated MAX20408AFOD/VY+
- Part No.:
- MAX20408AFOD/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOD/VY+.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:908
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Product details
Overview
MAX20408AFOD/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with internal high-side and low-side MOSFETs, delivering up to 8A output current from a 3.0V–36V input. It features 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, ±1% output voltage accuracy (E-version), and AEC-Q100 qualification for use in ADAS power rails.
For engineers reviewing the MAX20408AFOD/VY+ datasheet, MAX20408AFOD/VY+ pinout, MAX20408AFOD/VY+ application, or MAX20408AFOD/VY+ equivalent, key selection criteria include dropout operation at 99% duty cycle, dual-phase capability for 20A systems, windowed PGOOD monitoring, and FC2QFN thermal performance in space-constrained automotive modules.
Technical Context
The MAX20408AFOD/VY+ implements average current-mode control with 34ns minimum on-time, enabling stable regulation across wide VIN/VOUT ratios (e.g., 12V→3.3V or 24V→5V) without pulse-skipping artifacts. Its dual-phase architecture supports dynamic current sharing and 180° out-of-phase operation between controller and target ICs, reducing input/output ripple and improving transient response.
It integrates a 1.8V BIAS linear regulator with 2.2μF output capacitance requirement, symmetrical SUP/PGND pin placement for balanced current loops, and spread-spectrum modulation (±3% at 2.1MHz) to suppress EMI peaks - all while maintaining AEC-Q100 Grade-1 (−40°C to +125°C) operation and 42V load-dump tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports cold-crank (3V) and load-dump (42V transient) conditions in automotive 12V/24V systems. |
| Max Output Current | 8A - sufficient for powering radar SoCs, camera ISPs, or infotainment processors without external current boosting. |
| Quiescent Current | 10μA in skip mode - enables always-on functionality in vehicle body control modules with <100μA system standby budgets. |
| Switching Frequency | 2.1MHz or 400kHz - 2.1MHz allows <1μH inductors and 10μF ceramic output caps; 400kHz improves light-load efficiency. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures precise rail regulation for sensitive analog front-ends and ADC references in ADAS sensors. |
| Duty Cycle Max | 99% - maintains regulation during battery brownout (e.g., 5V out from 5.05V input), critical for engine-start scenarios. |
| Thermal Rating | −40°C to +125°C ambient, 175°C junction shutdown - validated for under-hood placement near ECUs or radar housings. |
Pinout & Package
MAX20408AFOD/VY+ uses a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (bottom-side PGND connection). Symmetric SUP and PGND pin placement minimizes high-current loop area, reducing EMI radiation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, EN | Enable Input | High-voltage compatible (3V–36V); drives IC into 4μA shutdown when pulled low - ideal for microcontroller-controlled power sequencing. |
| 2, BST | Bootstrap Supply | Connects 0.1μF ceramic cap to LX; sustains high-side gate drive during continuous conduction mode in buck topology. |
| 3, 9, SUP | IC Power Input | Dual pins internally connected; bypassed with 0.1μF + 4.7μF ceramics close to IC - reduces input ripple and improves EMI immunity. |
| 4, 5, 7, PGND | Power Ground | Four dedicated PGND pins minimize ground impedance; must be tied directly to thermal pad and low-impedance plane for thermal and noise control. |
| 6, LX | Switch Node | Connects to buck inductor; high dv/dt node requiring tight layout and guard ring - critical for EMI and efficiency performance. |
| 10, GND | Analog Ground | Separate from PGND; connects to FB/VEA/PGOOD reference - isolates noise-sensitive feedback path from power switching currents. |
| 11, BIAS | 1.8V LDO Output | Powers internal circuitry; requires ≥2.2μF ceramic cap to GND - provides stable bias independent of main output voltage. |
| 12, FB | Feedback Input | Connects to resistor divider (for adjustable VOUT) or to BIAS (for fixed VOUT); 0.8V reference with ±1.5% accuracy over temp. |
| 13, OUT | Output Sense | Used only when FB tied to BIAS - senses actual output voltage for improved line/load regulation in fixed-output configurations. |
| 14, VEA | Error Amplifier Output | Connected between controller/target in dual-phase mode - enables active current balancing and eliminates need for external op-amps. |
| 15, PGOOD | Open-Drain Power-Good | Windowed monitor (93–105% VOUT for standard, 101.75–107.25% for E-version); asserts low during soft-start and fault conditions. |
| 16, SYNC | Synchronization Input | Selects FPWM (high), skip mode (low), or external clock sync (AC signal); enables system-level timing coordination across multiple rails. |
| 17, SYNCOUT | 180° Out-of-Phase Clock | Drives SYNC of target IC in dual-phase setup; open in single-phase - simplifies phase interleaving without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase operation support | Enables 20A total output using two MAX20408AFOD/VY+ ICs with dynamic current sharing and 180° phase shift - cuts input/output ripple by >70% vs. single-phase. |
| Windowed PGOOD (E-version) | Monitors both overvoltage and undervoltage thresholds (e.g., 101.75–107.25% VOUT) - detects regulator drift or capacitor aging before system failure occurs. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1MHz reduces peak EMI emissions by up to 10dB - meets CISPR 25 Class 5 without added shielding or ferrites. |
| 99% dropout capability | Maintains regulation with <50mV headroom (e.g., 5.05V → 5V), eliminating need for pre-regulators in start-stop engine applications. |
| Thermally optimized FC2QFN | θJCb = 7.7°C/W on 4-layer JEDEC board - enables 8A continuous operation at +85°C ambient without heatsink or airflow. |
Applications
| ADAS Radar Power Supply | Automotive Infotainment Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver SoC requiring clean, tightly regulated 1.2V/3.3V/5V rails in front-bumper module exposed to −40°C to +105°C ambient. IC Role / Device Role / Timing Role: Primary buck regulator delivering 8A at 5V with 10μA IQ to extend battery life during vehicle sleep mode. Use Value: 99% duty cycle sustains output during cold-crank; windowed PGOOD detects early capacitor degradation before radar false alarms occur. |
Use Scenario: Supplies 3.3V core voltage to infotainment application processor (e.g., NXP i.MX8) in center console with strict EMI limits per OEM spec. IC Role / Device Role / Timing Role: High-frequency (2.1MHz) buck converter minimizing inductor size and avoiding AM band interference (530–1710kHz). Use Value: Spread-spectrum mode reduces radiated emissions below CISPR 25 Class 5 limits; dual-phase option scales to 20A for multi-display systems. |
| Body Control Module (BCM) Always-On Rail | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Generates 3.3V always-on supply for CAN/LIN transceivers and wake-up logic in BCM, operating continuously with <100μA system budget. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter leveraging skip mode to achieve 10μA no-load current while maintaining fast wake-up response. Use Value: 4μA shutdown current and 2.5ms soft-start prevent bus glitches during microcontroller reset sequences. |
Use Scenario: Provides isolated 5V rail for torque sensor signal conditioning and resolver-to-digital conversion in EPS motor control unit. IC Role / Device Role / Timing Role: Robust buck stage with 42V load-dump tolerance and thermal shutdown (175°C) for under-hood deployment near steering column. Use Value: AEC-Q100 Grade-1 qualification and symmetric SUP/PGND layout ensure EMC stability in high-noise EPS environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20410AFOD/VY+ | 10A rated output (vs. 8A), higher ILIM threshold (14A vs. 12A), identical pinout and feature set. | Better suited for higher-current ADAS cameras or domain controllers where margin above 8A is required. | Select MAX20410AFOD/VY+ when peak load exceeds 8A but same thermal footprint and control interface are needed. |
| TPS62933RGER | 6A max output, 3V–36V input, 15μA IQ, 2.1MHz only, no dual-phase or spread-spectrum support. | Lacks windowed PGOOD, dual-phase, and load-dump robustness - limited to non-safety-critical infotainment peripherals. | Choose TPS62933RGER only for cost-sensitive, lower-current applications where AEC-Q100 and EMI features are not mandatory. |
Compared with MAX20410AFOD/VY+, the MAX20408AFOD/VY+ offers tighter thermal design margins at 8A loads; compared with TPS62933RGER, it delivers superior automotive robustness, dual-phase scalability, and certified EMI performance - making it the preferred choice for safety-critical ADAS and EPS subsystems.
Availability
MAX20408AFOD/VY+ is available at Aetrix Electronics and suitable for automotive ADAS radar supplies, infotainment core rails, and electric power steering sensor interfaces requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX20408AFOD/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 semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and connectivity solutions.
The MAX20408/MAX20410 family is designed specifically for automotive power management - delivering high-current, low-IQ, AEC-Q100-compliant DC-DC conversion in ultra-small packages for next-generation ADAS, electrification, and cockpit systems.
FAQ
What is the maximum output current rating for MAX20408AFOD/VY+?
The MAX20408AFOD/VY+ is rated for up to 8A continuous output current under recommended operating conditions (TA ≤ +85°C, 4-layer board). Derating applies above +85°C ambient, with full 8A supported up to +105°C when using proper thermal layout and copper area. The device includes cycle-by-cycle current limiting at 12A nominal to protect against overload.
Does MAX20408AFOD/VY+ support dual-phase operation, and how is it configured?
Yes, MAX20408AFOD/VY+ supports dual-phase operation for up to 20A total output. One IC is configured as controller (SYNCOUT left open, SYNC driven externally or high), the other as target (SYNCOUT tied to BIAS, SYNC driven by controller's SYNCOUT). VEA pins are connected between devices to enable dynamic current sharing and 180° phase interleaving.
What is the purpose of the windowed PGOOD function in MAX20408AFOD/VY+?
The windowed PGOOD in MAX20408AFOD/VY+ monitors both overvoltage and undervoltage conditions - asserting low when output falls below 93% or rises above 105% of nominal (standard version) or 101.75–107.25% (E-version). This detects regulator drift, capacitor aging, or feedback network faults earlier than standard monotonic PGOOD, enhancing system reliability in safety-critical ADAS applications.
Can MAX20408AFOD/VY+ operate during automotive cold-crank conditions?
Yes, MAX20408AFOD/VY+ operates down to 3.0V input and supports 99% duty cycle in dropout mode - enabling stable 5V or 3.3V output even when battery voltage sags to 5.05V during engine cranking. Combined with 42V load-dump tolerance and AEC-Q100 Grade-1 qualification, it meets full automotive electrical requirements.
What package type and thermal performance does MAX20408AFOD/VY+ use?
MAX20408AFOD/VY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad. On a 4-layer JEDEC board, its junction-to-board thermal resistance (θJB) is 16.3°C/W and junction-to-case (bottom) is 7.7°C/W - enabling 8A continuous operation at +85°C ambient without forced airflow or heatsinks when properly mounted to a thermal plane.
MAX20408AFOD/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V (3.3V)
- Voltage - Output (Max):
- 6V
- Current - Output:
- 8A
- 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:
- 17-FC2QFN (3.5x3.75)
MAX20408AFOD/VY+ FAQ
1.How can I place an order for MAX20408AFOD/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOD/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 MAX20408AFOD/VY+ reliable?
The price and inventory of MAX20408AFOD/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOD/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOD/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOD/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOD/VY+?
MAX20408AFOD/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOD/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 MAX20408AFOD/VY+?
For technical support, including MAX20408AFOD/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOD/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOD/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOD/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 MAX20408AFOD/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOD/VY+?
All MAX20408AFOD/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOD/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 MAX20408AFOD/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOD/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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