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Analog Devices Inc./Maxim Integrated MAX20408AFOF/VY+
- Part No.:
- MAX20408AFOF/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOF/VY+.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:516
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Product details
Overview
MAX20408AFOF/VY+ from Analog Devices is an automotive-grade, fully integrated 36V synchronous buck converter delivering up to 8A output current with 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, and dual-phase capability for 20A systems. It operates from 3.0V to 36V input, supports 99% duty cycle dropout operation, and features windowed PGOOD, ±1% output voltage accuracy (MAX20408E variant), and AEC-Q100 qualification - deployed in ADAS power rails and infotainment domain controllers.
For engineers reviewing the MAX20408AFOF/VY+ datasheet, MAX20408AFOF/VY+ pinout, MAX20408AFOF/VY+ application, or MAX20408AFOF/VY+ equivalent, key selection criteria include its 17-pin FC2QFN package, programmable 0.8V–10V output (2.1MHz) or fixed 3.3V/4V/5V options, EN threshold accuracy (0.825V–0.975V), 34ns minimum on-time, and dual-phase synchronization via SYNC/SYNCOUT for scalable 20A designs.
Technical Context
The MAX20408AFOF/VY+ implements average current-mode control with a 34ns minimum on-time, enabling high step-down ratios without pulse-skipping artifacts. Its internal high-side (25mΩ typ) and low-side (12mΩ typ) MOSFETs support continuous 8A output at 12VIN/5VOUT with up to 94.3% efficiency at 2.1MHz and 95.6% at 400kHz.
Dual-phase operation is enabled by VEA pin coupling and 180° out-of-phase SYNCOUT clocking, delivering dynamic current sharing and thermal balancing across two ICs. The device integrates a 1.8V BIAS LDO, supports spread-spectrum modulation (±3% fSW), and includes hiccup-mode short-circuit protection with 25ms restart delay.
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. |
| Output Current | 8A continuous - sufficient for powering SoCs, radar MMICs, or multi-core MCU clusters in ADAS ECUs. |
| Quiescent Current | 10μA in skip mode - enables always-on functionality while meeting ISO 16750-2 sleep current requirements. |
| Switching Frequency | 2.1MHz or 400kHz - 2.1MHz allows <1μH inductors and compact 0402/0603 ceramic capacitors; 400kHz improves light-load efficiency. |
| Output Voltage Accuracy | ±1% over -40°C to +125°C - ensures stable core voltage for safety-critical processors without external trimming. |
| Minimum On-Time | 34ns - enables 12V-to-1V conversion at 2.1MHz without pulse skipping, critical for high-ratio point-of-load regulation. |
| Dual-Phase Support | Up to 20A with dynamic current sharing - eliminates need for external current-sharing controllers in high-power domain supplies. |
Pinout & Package
MAX20408AFOF/VY+ uses a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (θJCb = 7.7°C/W on 4-layer JEDEC board). Symmetric SUP and PGND pin placement minimizes high-current loop area for superior EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, EN | Enable Input | High-voltage compatible (3V–36V); 0.825V–0.975V threshold enables precise UVLO programming for battery monitoring. |
| 2, BST | Bootstrap Supply | Drives high-side gate; requires 0.1μF ceramic capacitor to LX for reliable 100% duty-cycle operation. |
| 3, 9, SUP | Power Supply Input | Dual-supply pins internally connected; bypass with 0.1μF + 4.7μF ceramics near each pin for low-impedance VIN path. |
| 4, 5, 7, 8, PGND | Power Ground | Five dedicated PGND pins reduce ground bounce and improve thermal dissipation under 8A load. |
| 6, LX | Switch Node | Connects to buck inductor; high-impedance when disabled; layout must minimize parasitic inductance for EMI control. |
| 10, GND | Analog Ground | Separate from PGND; connects to PCB ground plane at single-point star node to isolate noise-sensitive feedback paths. |
| 11, BIAS | LDO Output | 1.8V internal regulator powers internal circuitry; requires ≥2.2μF ceramic cap to GND for stability during startup. |
| 12, FB | Feedback Input | Programs output via resistor divider (0.8V–10V) or ties to BIAS for fixed-output configuration (3.3V/4V/5V). |
| 13, OUT | Output Sense | Used only when FB tied to BIAS; enables accurate remote sensing of regulated output voltage. |
| 14, VEA | Error Amplifier Output | Connected between controller/target in dual-phase mode to force matched current sharing and eliminate external compensation. |
| 15, PGOOD | Power-Good Indicator | Open-drain windowed monitor (102.75%–107.25% rising / 101.75%–106.25% falling) for robust rail validation in ASIL-B systems. |
| 16, SYNC | Synchronization Input | Selects FPWM (high), skip mode (low), or external clock sync (AC signal); enables system-wide timing coordination. |
| 17, SYNCOUT | 180° Out-of-Phase Clock | Configures target IC in dual-phase; driven low to BIAS to set target role; eliminates need for external phase-shift circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed PGOOD | Provides asymmetric high/low thresholds (102.75%–107.25% / 101.75%–106.25%) for fault-tolerant rail monitoring in safety-critical ADAS applications. |
| Thermally Optimized FC2QFN | 3.5mm × 3.75mm footprint with θJCb = 7.7°C/W enables 8A operation without heatsink in +85°C ambient automotive cabins. |
| Dual-Phase Scalability | Two MAX20408AFOF/VY+ ICs deliver 20A with automatic current balancing via VEA coupling - no external current-sense resistors or DACs required. |
| Spread-Spectrum Modulation | ±3% frequency dithering reduces peak EMI emissions by >10dB at fundamental switching harmonics, easing CISPR 25 Class 5 compliance. |
| 99% Dropout Operation | Maintains regulation down to VIN – VOUT = 120mV (at 8A), supporting deep cold-crank scenarios where battery drops to 6V with 5V rail requirement. |
| AEC-Q100 Grade-1 | Qualified from -40°C to +125°C junction temperature with 150°C thermal shutdown and 20°C hysteresis - meets automotive reliability lifetime targets. |
Applications
| ADAS Radar Power Supply | Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver ASIC requiring clean, tightly regulated 1.0V/3A supply with ultra-low noise and fast transient response. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.0V from 12V battery; uses 2.1MHz switching and 34ns min-on-time to achieve 12:1 step-down without instability. Use Value: Enables direct 12V-to-1V conversion with <15mV output ripple and <5μs load-step recovery - eliminating intermediate 5V stage and reducing BoM count by 30%. |
Use Scenario: Supplies core voltage to quad-core ARM Cortex-A76 SoC in digital cockpit display, operating across wide temperature and load ranges. IC Role / Device Role / Timing Role: High-efficiency, dynamically scalable power source using dual-phase configuration to deliver 12A peak current during GPU burst loads. Use Value: Achieves >93% efficiency at 1A–10A load range and maintains ±1% output accuracy over -40°C to +105°C - ensuring deterministic SoC performance and thermal margin. |
| Automotive Body Control Module (BCM) | Telematics Control Unit (TCU) PMIC |
|
Use Scenario: Provides 5V/8A main supply for microcontroller, CAN transceivers, and sensor interfaces in centralized body electronics architecture. IC Role / Device Role / Timing Role: Primary 36V-input buck converter with 99% duty cycle support for sustained operation during 6V cold-crank events. Use Value: Eliminates need for pre-regulator stage; supports 42V load dump survival per ISO 7637-2 Pulse 5a; reduces solution size by 45% vs. discrete FET + controller approach. |
Use Scenario: Serves as first-stage regulator in TCU power tree, feeding downstream LDOs and DC-DCs for LTE modem, GNSS, and MCU subsystems. IC Role / Device Role / Timing Role: High-reliability, low-IQ buck converter operating in skip mode during cellular idle states to meet 100μA system sleep budget. Use Value: Delivers 10μA quiescent current and windowed PGOOD for ASIL-B compliant power sequencing - enabling certified functional safety boot-up verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20408AFOF/VY+ | 8A, 17-pin FC2QFN, 2.1MHz/400kHz, windowed PGOOD, ±1% accuracy, AEC-Q100 Grade-1 | Targeted for ADAS, infotainment, and BCM applications requiring dual-phase scalability and ultra-low IQ | Preferred for new designs needing 20A dual-phase capability, spread-spectrum EMI reduction, and full automotive qualification. |
| MPQ4333GQ-AEC1-P | 8A, 16-pin QFN, fixed 2.2MHz, ±2% output accuracy, no windowed PGOOD, AEC-Q100 Grade-1 | Suitable for cost-sensitive body electronics where 20A scalability and advanced PGOOD are not required | Select when 2.2MHz fixed frequency suffices and dual-phase operation is unnecessary; lower BOM cost but reduced feature set. |
Compared with MAX20408AFOF/VY+, the MPQ4333GQ-AEC1-P offers comparable 8A rating and AEC-Q100 qualification but lacks windowed PGOOD, dual-phase support, and spread-spectrum EMI control - making it suitable for simpler automotive loads where those features are noncritical.
Availability
MAX20408AFOF/VY+ is available at Aetrix Electronics and suitable for automotive ADAS radar modules, infotainment SoC power supplies, and body control unit designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for MAX20408AFOF/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 power management semiconductors, serving automotive, industrial, and communications markets with precision, reliability, and safety-certified solutions.
The MAX20408AFOF/VY+ belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding ADAS, infotainment, and domain controller applications requiring high efficiency, ultra-low quiescent current, and robust functional safety compliance.
FAQ
What is the maximum output current capability of the MAX20408AFOF/VY+?
The MAX20408AFOF/VY+ delivers up to 8A continuous output current under typical operating conditions (12VIN/5VOUT, +25°C, 2.1MHz). Its thermal design supports this rating in a 3.5mm × 3.75mm FC2QFN package with θJCb = 7.7°C/W on a 4-layer board. For higher current needs, two MAX20408AFOF/VY+ ICs can be configured in dual-phase mode to deliver up to 20A with dynamic current sharing.
Does the MAX20408AFOF/VY+ support both fixed and adjustable output voltages?
Yes, the MAX20408AFOF/VY+ supports both configurations. When FB is connected to BIAS, it provides factory-trimmed fixed outputs of 3.3V, 4V, or 5V. When FB is connected to a resistor divider between OUT and GND, it enables adjustable output from 0.8V to 10V - with 2.1MHz operation supporting up to 10V and 400kHz supporting up to 10V as well, per datasheet specifications.
How does the MAX20408AFOF/VY+ achieve ultra-low quiescent current?
The MAX20408AFOF/VY+ achieves 10μA quiescent current in skip mode by disabling switching activity during light loads while maintaining regulation via pulse-frequency modulation. This mode is activated by pulling SYNC low and is validated across -40°C to +125°C. In shutdown (EN low), quiescent current drops further to 4μA, meeting stringent automotive sleep-mode requirements.
What package type and pin count does the MAX20408AFOF/VY+ use?
The MAX20408AFOF/VY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (package code F173A3FY+4). It features five PGND pins, dual SUP inputs, and symmetric SUP/PGND layout to minimize high-current loop area - all contributing to superior thermal performance and EMI behavior in dense automotive PCB layouts.
Is the MAX20408AFOF/VY+ qualified for automotive applications?
Yes, the MAX20408AFOF/VY+ is AEC-Q100 Grade-1 qualified (-40°C to +125°C ambient), supports 42V load dump per ISO 7637-2 Pulse 5a, and includes integrated protections including overtemperature shutdown (175°C), hiccup-mode short-circuit protection, and robust EN threshold accuracy - making it suitable for ASIL-B automotive systems including ADAS and infotainment.
MAX20408AFOF/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 (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 8A
- 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:
- 17-FC2QFN (3.5x3.75)
MAX20408AFOF/VY+ FAQ
1.How can I place an order for MAX20408AFOF/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOF/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 MAX20408AFOF/VY+ reliable?
The price and inventory of MAX20408AFOF/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOF/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOF/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOF/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOF/VY+?
MAX20408AFOF/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOF/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 MAX20408AFOF/VY+?
For technical support, including MAX20408AFOF/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOF/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOF/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOF/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 MAX20408AFOF/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOF/VY+?
All MAX20408AFOF/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOF/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 MAX20408AFOF/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOF/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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