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Analog Devices Inc./Maxim Integrated MAX20408AFOE/VY+
- Part No.:
- MAX20408AFOE/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOE/VY+.pdf
- Description:
- IC REG BCK PROG/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:268
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Product details
Overview
MAX20408AFOE/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 - deployed in ADAS power rails and infotainment domain controllers.
For engineers reviewing the MAX20408AFOE/VY+ datasheet, MAX20408AFOE/VY+ pinout, MAX20408AFOE/VY+ application, or MAX20408AFOE/VY+ equivalent, key selection criteria include AEC-Q100 qualification, ±1% output voltage accuracy (MAX20408E variant), windowed PGOOD, 34ns minimum on-time, and FC2QFN-17 package thermal performance for high-density automotive PCBs.
Technical Context
The MAX20408AFOE/VY+ implements average current-mode control with 34ns minimum on-time, enabling stable operation across wide input/output voltage ratios (3V–36V IN, 0.8V–10V OUT) without pulse-skipping instability. Its dual-phase architecture supports dynamic current sharing and 180° out-of-phase operation between controller and target ICs.
It integrates high-side (25mΩ typ) and low-side (12mΩ typ) MOSFETs, a 1.8V BIAS linear regulator, and programmable EN threshold (0.825V–0.975V) for precise UVLO. The SYNC input enables forced-PWM, skip-mode, or external clock synchronization - with spread-spectrum option reducing EMI emissions by ±3% frequency modulation.
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 - sustained continuous output with thermal derating per θJA = 38.6°C/W on 4-layer JEDEC board. |
| Quiescent Current | 10μA in skip mode - enables always-on subsystems (e.g., CAN wake-up logic) without battery drain. |
| Switching Frequency | 2.1MHz or 400kHz - enables compact 0805/0603 inductors and reduces audible noise; 2.1MHz avoids AM band interference. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures tight regulation for sensitive SoCs and image sensors in ADAS cameras. |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 5VOUT from 5.05VIN), critical for engine start-stop operation. |
| PGOOD Window | 102.75%–107.25% (rising), 101.75%–106.25% (falling) - windowed detection prevents false trips during transient load steps. |
Pinout & Package
MAX20408AFOE/VY+ uses a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package (package code F173A3FY+4) with exposed thermal pad, symmetric SUP/PGND pin placement for low-impedance power loops, and RoHS-compliant finish.
| 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 | Connects 0.1μF ceramic capacitor to LX; sustains high-side gate drive during 99% duty cycle operation. |
| 3, 9, SUP | IC & High-Side Supply Input | Dual pins internally connected; bypassed with 0.1μF + 4.7μF ceramics close to IC for transient immunity. |
| 4, 5, 7, PGND | Power Ground | Four dedicated PGND pins minimize ground bounce and improve EMI performance via balanced return paths. |
| 6, LX | Switch Node | Connects to buck inductor; handles 10A RMS current; requires tight layout to reduce EMI and voltage spikes. |
| 10, GND | Analog Ground | Separate from PGND; connects to PCB ground plane at single point to avoid noise coupling into feedback path. |
| 11, BIAS | 1.8V Linear Regulator Output | Powers internal circuitry; requires ≥2.2μF ceramic cap to GND; auto-switches from input to output post-startup. |
| 12, FB | Feedback Input | Connects to resistor divider for adjustable output (0.8V–10V) or to BIAS for fixed-output configuration. |
| 13, OUT | Output Sense Input | 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 for dynamic current sharing; open in single-phase. |
| 15, PGOOD | Open-Drain Power-Good | Windowed indicator (102.75%–107.25%) asserts low during soft-start or fault; requires external pull-up. |
| 16, SYNC | Synchronization Input | Configures FPWM (high), skip mode (low), or external clock sync; accepts 1.7–2.6MHz (2.1MHz mode) signals. |
| 17, SYNCOUT | 180° Out-of-Phase Clock Output | Drives SYNC of target IC in dual-phase; tied to BIAS to configure as target; open in single-phase. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed PGOOD | Provides asymmetric rising/falling thresholds (102.75%/101.75%) to prevent chatter during output transients in ADAS camera rails. |
| Dual-Phase Scalability | Enables 20A total output using two ICs with 180° phase shift and dynamic current sharing - no external current-sense resistors required. |
| Spread-Spectrum EMI Reduction | ±3% triangular frequency modulation centered at 2.1MHz (or 400kHz) lowers peak radiated emissions without compromising regulation. |
| Thermally Optimized FC2QFN | θJCb = 7.7°C/W (bottom) and θJB = 16.3°C/W enable >8A continuous operation on standard 4-layer automotive PCBs. |
| Accurate EN Threshold | 0.825V–0.975V EN hysteresis allows precise battery undervoltage lockout (UVLO) setting for 12V system brownout protection. |
| Low Dropout Operation | 99% max duty cycle supports 5VOUT from 5.05VIN - essential for start-stop engine cranking where input dips below 6V. |
Applications
| ADAS Camera Power Rail | Infotainment SoC Core Supply |
|---|---|
Use Scenario: Powers 3–5MP image sensor and ISP in front-facing ADAS camera module under automotive temperature (-40°C to +125°C) and vibration. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator with windowed PGOOD monitoring and 10μA IQ for always-on wake detection. Use Value: ±1% output accuracy ensures consistent sensor ADC reference; 34ns min on-time supports 12V→3.3V conversion without skipping. |
Use Scenario: Supplies core voltage (0.8V–1.2V) to ARM-based infotainment SoC with dynamic DVFS and burst loading. IC Role / Device Role / Timing Role: Adjustable-output buck converter synchronized to SoC clock via SYNC input to avoid beat frequencies. Use Value: 2.1MHz switching enables <1μH inductors and <22μF ceramic output caps - reducing solution size by 40% vs. 400kHz designs. |
| Domain Controller Auxiliary Rail | Automotive Gateway Power Management |
Use Scenario: Generates isolated 5V auxiliary rail for CAN FD transceivers and Ethernet PHYs in zonal architecture domain controllers. IC Role / Device Role / Timing Role: Dual-phase configured MAX20408AFOE/VY+ pair delivers 20A with 180° interleaving to halve input ripple current. Use Value: Dynamic current sharing maintains ±5% load balance across phases during rapid CPU/GPU load transients. |
Use Scenario: Powers gateway MCU, security module, and cellular modem in vehicle-to-cloud telematics unit with strict sleep-current budget. IC Role / Device Role / Timing Role: Always-on 3.3V supply operating in skip mode with 10μA IQ and AEC-Q100 qualified thermal shutdown. Use Value: 99% duty cycle sustains 3.3V output during 5.5V cold-crank events; PGOOD window prevents false resets during CAN bus arbitration spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20404ATP/VY+ | 4A rated, same FC2QFN-15 footprint, no dual-phase support, 400kHz only, ±2% VOUT accuracy. | Targeted at lower-power clusters (e.g., body control modules), not ADAS or domain controllers. | Select when cost-sensitive, space-constrained, and ≤4A load is sufficient - retains layout compatibility but lacks scalability. |
| TPS62933RQYR | 6A, 3V–36V, 1.8MHz, 15μA IQ, QFN-16, no windowed PGOOD or AEC-Q100 grade. | Industrial/medical DC/DC use; lacks automotive qualification, spread-spectrum, and dual-phase capability. | Consider for non-automotive 6A applications where AEC-Q100 and 20A scalability are not required - no pin compatibility. |
Compared with MAX20404ATP/VY+, MAX20408AFOE/VY+ provides 2× output current, dual-phase scalability, and tighter ±1% accuracy; versus TPS62933RQYR, it adds AEC-Q100, windowed PGOOD, and automotive thermal robustness - making it the only qualified choice for safety-critical ADAS power rails.
Availability
MAX20408AFOE/VY+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC supplies, and domain controller auxiliary rails requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX20408AFOE/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, signal chain, and RF solutions.
MAX20408AFOE/VY+ belongs to Analog Devices' automotive power management portfolio, designed specifically for AEC-Q100-compliant, high-efficiency DC-DC conversion in ADAS, infotainment, and zonal architecture systems demanding ultra-low IQ and robust EMI performance.
FAQ
What is the maximum continuous output current rating for MAX20408AFOE/VY+?
The MAX20408AFOE/VY+ is rated for 8A continuous output current under recommended operating conditions (TA ≤ +70°C, 4-layer JEDEC board). Derating applies above +70°C at 37mW/°C, and thermal performance depends on PCB copper area and airflow. Peak current capability reaches 12A due to ILIM threshold of 10–14A, but sustained operation beyond 8A requires careful thermal design and dual-phase configuration.
Does MAX20408AFOE/VY+ support dual-phase operation, and how is it configured?
Yes, MAX20408AFOE/VY+ supports dual-phase operation for up to 20A total output. One IC is configured as controller (SYNCOUT left open), the other as target (SYNCOUT tied to BIAS). VEA pins are connected between devices, and SYNC of the target is driven by SYNCOUT of the controller. This enables 180° interleaving and dynamic current sharing without external current-sense components.
What is the purpose of the windowed PGOOD feature in MAX20408AFOE/VY+?
The windowed PGOOD in MAX20408AFOE/VY+ provides asymmetric rising (102.75%–107.25%) and falling (101.75%–106.25%) thresholds to prevent false triggering during fast load transients - common in ADAS camera startup or SoC DVFS events. Unlike standard PGOOD, it avoids chatter by requiring both overvoltage and undervoltage conditions to be cleared before asserting high-impedance state.
Can MAX20408AFOE/VY+ operate with input voltage below 3.0V, such as during cold-crank?
No - the absolute minimum input voltage is 3.0V per datasheet specifications. During cold-crank, automotive batteries may dip to ~2.8V, but MAX20408AFOE/VY+ will shut down if VSUP falls below 2.9V (rising UVLO threshold). For sub-3V operation, a pre-regulator or alternative device with lower VIN min (e.g., MAX20096) is required. The 99% duty cycle supports regulation down to VIN ≈ VOUT/0.99, not sub-3V startup.
How does the spread-spectrum option reduce EMI in MAX20408AFOE/VY+?
The spread-spectrum option modulates the switching frequency by ±3% around the nominal value (2.1MHz or 400kHz) using a 4.5kHz triangular wave. This spreads energy across a wider bandwidth, lowering peak radiated emissions by up to 10dB - critical for passing CISPR 25 Class 5 automotive EMI tests. Spread-spectrum is factory-enabled and disabled automatically when SYNC is used for external clock synchronization.
MAX20408AFOE/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:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V (4V)
- 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)
MAX20408AFOE/VY+ FAQ
1.How can I place an order for MAX20408AFOE/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOE/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 MAX20408AFOE/VY+ reliable?
The price and inventory of MAX20408AFOE/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOE/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOE/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOE/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOE/VY+?
MAX20408AFOE/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOE/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 MAX20408AFOE/VY+?
For technical support, including MAX20408AFOE/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOE/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOE/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOE/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 MAX20408AFOE/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOE/VY+?
All MAX20408AFOE/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOE/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 MAX20408AFOE/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOE/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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