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Analog Devices Inc./Maxim Integrated MAX20408EAFLB/VY+T
- Part No.:
- MAX20408EAFLB/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-PowerWQFN
- Datasheet:
-
MAX20408EAFLB/VY+T.pdf
- Description:
- IC REG BUCK ADJ 8A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,148
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Product details
Overview
MAX20408EAFLB/VY+T from Analog Devices is an automotive-grade, fully integrated 8A synchronous buck converter with internal high-side and low-side MOSFETs, 3.0V–36V input range, ±1% output voltage accuracy (MAX20408E variant), and 2.1MHz/400kHz selectable switching frequency - deployed in infotainment power rails and ADAS domain controllers requiring compact, AEC-Q100-compliant DC-DC conversion.
For engineers reviewing the MAX20408EAFLB/VY+T datasheet, MAX20408EAFLB/VY+T pinout, MAX20408EAFLB/VY+T application, or MAX20408EAFLB/VY+T equivalent, key selection criteria include its 15-pin FC2QFN thermal performance, windowed PGOOD monitoring, 10μA skip-mode quiescent current, and dual-phase scalability to 16A - all validated for -40°C to +125°C automotive operation.
Technical Context
The MAX20408EAFLB/VY+T implements average current-mode control with 34ns minimum on-time, enabling stable regulation across wide VIN/VOUT ratios (e.g., 12V→3.3V) without pulse-skipping artifacts. Its dual-phase capability uses SYNCOUT-to-SYNC interconnection with 180° phase shift and dynamic current sharing between controller and target ICs.
It integrates a 1.8V BIAS linear regulator (with 2.2μF bypass), programmable EN threshold (0.825V–0.975V), and spread-spectrum EMI reduction. The FC2QFN package features symmetric SUP/PGND pin placement to minimize high-current loop area and improve radiated emissions performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A continuous - supports single-phase automotive subsystems like camera modules or display logic supplies without external current boosting. |
| Input Voltage Range | 3.0V to 36V - accommodates cold-crank (3V), nominal 12V/24V, and 42V load-dump transients without external protection circuitry. |
| Switching Frequency | 2.1MHz (fixed) - enables use of sub-1μH inductors and <10μF ceramic output capacitors, reducing solution footprint by >40% vs. 400kHz designs. |
| Output Voltage Accuracy | ±1% over temperature - ensures tight regulation for sensitive SoC cores and SerDes interfaces without post-regulation LDOs. |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on vehicle networks (e.g., telematics wake-up circuits). |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 5V out from 5.05V input), critical for start-stop engine cycles. |
| Thermal Rating | -40°C to +125°C ambient - qualified per AEC-Q100 Grade 1, supporting under-hood and dashboard mounting locations. |
Pinout & Package
MAX20408EAFLB/VY+T is housed in a thermally enhanced 3.5mm × 3.75mm, 15-pin FC2QFN package with exposed thermal pad (bottom-side soldered). Pin layout optimizes high-current paths: dual SUP and PGND pins are symmetrically placed to balance input/output loop inductance and suppress EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | SUP | IC supply and high-side switch rail - dual pins reduce IR drop and enable robust 36V transient handling with local 0.1μF + 4.7μF ceramic decoupling. |
| 4, 7 | PGND | Power ground return for LX and internal FETs - symmetric placement with SUP minimizes high-di/dt loop area for lower EMI. |
| 2 | BST | Bootstrap supply for high-side gate driver - requires 0.1μF ceramic capacitor to LX to sustain 99% duty cycle operation. |
| 3, 6 | LX | Switch node - connects directly to buck inductor; high-impedance when disabled to prevent shoot-through during startup/shutdown. |
| 8 | GND | Analog reference ground - connected to PCB ground plane at single point near FB/VEA to avoid noise coupling into feedback path. |
| 11 | BIAS | 1.8V internal LDO output - powers internal logic; requires ≥2.2μF ceramic cap to GND for stability and transient response. |
| 12 | FB | Feedback input - tied to BIAS for fixed 3.3V/4V/5V outputs, or resistor-divider for 0.8V–10V adjustable regulation. |
| 13 | OUT | Output voltage sense - used only in fixed-output mode to monitor VOUT directly, improving load regulation accuracy. |
| 14 | VEA | Error amplifier output - externally connected between controller and target ICs in dual-phase configuration to force matched current sharing. |
| 15 | SYNCOUT | 180° phase-shifted clock output - configured as target in dual-phase by tying to BIAS; enables synchronized interleaving without external timing IC. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed PGOOD | Asserts low only when VOUT falls outside 101.75%–107.25% (rising) or 101.75%–106.25% (falling) of setpoint - prevents false fault triggers during load transients. |
| EN Threshold Accuracy | 0.825V–0.975V turn-on range with 100mV hysteresis - enables precise battery UVLO coordination in multi-rail automotive systems. |
| Dual-Phase Scalability | Two MAX20408EAFLB/VY+T ICs deliver 16A with 180° phase shift and dynamic current sharing - eliminates need for discrete current-sharing resistors or external controllers. |
| Spread-Spectrum Modulation | ±3% frequency dithering - reduces peak EMI by >10dB at fundamental and harmonics, easing CISPR 25 Class 5 compliance. |
| Thermally Optimized FC2QFN | θJCb = 10.52°C/W (4-layer EV kit) - enables 8A operation at +85°C ambient without forced airflow, reducing system cooling cost. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers SoC, DDR memory, and display interface in head-unit systems with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering 8A peak current with 2.1MHz switching to minimize filter size and avoid AM band interference. Use Value: Eliminates need for secondary LDOs due to ±1% output accuracy and 10μA quiescent current extends ignition-off battery life. | Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view cameras mounted in exterior housings. IC Role / Device Role / Timing Role: Single-chip 5V/3.3V power solution operating from 9V–16V vehicle bus with cold-crank support down to 3V. Use Value: 99% duty cycle and AEC-Q100 qualification ensure uninterrupted operation during engine cranking and vibration-prone environments. |
| Domain Controller Core Rail | Telematics Always-On Wake-Up |
Use Scenario: Generates 1.8V or 1.2V core voltage for automotive domain controllers (e.g., zonal ECUs) using external resistor divider. IC Role / Device Role / Timing Role: Adjustable-output buck converter with 0.8V–10V range and 34ns min on-time supporting high VIN/VOUT ratios (e.g., 12V→1.2V). Use Value: Average current-mode control provides fast transient response to CPU burst loads while maintaining stability with low-ESR ceramic caps. | Use Scenario: Powers MCU and cellular modem in telematics control units requiring ultra-low sleep current and reliable wake-up from CAN/LIN. IC Role / Device Role / Timing Role: Always-on 3.3V regulator in skip mode, drawing only 10μA quiescent current while maintaining PGOOD supervision. Use Value: Windowed PGOOD and accurate EN threshold enable deterministic wake-up sequencing and prevent brownout resets during battery dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20410EAFLB/VY+T | 10A rated (vs. 8A), higher ILIM (14A vs. 12A), same package and pinout | Better suited for higher-current ADAS radar supplies or dual-core domain controllers | Select when >8A continuous load or higher short-circuit robustness is required; drop-in replacement with no layout change. |
| TPS546B24RVFT | PIN-TO-PIN incompatible; 12A, 3.5V–18V input, 0.6V–5.5V output, 500kHz–2.2MHz sync-capable | Targeted at non-automotive industrial servers; lacks AEC-Q100, windowed PGOOD, or 42V load-dump rating | Consider only for cost-sensitive non-automotive designs where AEC-Q100 and 36V input are not mandatory. |
Compared with MAX20410EAFLB/VY+T, the MAX20408EAFLB/VY+T offers tighter thermal margin at 8A loads and lower BOM cost for mid-power domains; versus TPS546B24RVFT, it delivers guaranteed automotive reliability, superior dropout performance, and integrated EMI mitigation - but requires dedicated FC2QFN layout.
Availability
MAX20408EAFLB/VY+T is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and domain controller core supplies requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for MAX20408EAFLB/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 with precision power, sensing, and connectivity solutions.
The MAX20408/MAX20410 family targets automotive power management with integrated high-current buck regulation, AEC-Q100 qualification, and EMI-optimized packaging - designed specifically for next-generation zonal architectures and electrified vehicle subsystems.
FAQ
What is the maximum input voltage rating for the MAX20408EAFLB/VY+T?
The MAX20408EAFLB/VY+T supports an absolute maximum input voltage of +42V on the SUP pin, enabling robust operation during automotive load-dump transients. Its recommended operating input range is 3.0V to 36V, covering cold-crank, nominal battery, and boosted rail conditions. This rating is verified per AEC-Q100 stress testing protocols and does not require external TVS clamping for standard 12V/24V systems.
Does the MAX20408EAFLB/VY+T support dual-phase operation, and how is it configured?
Yes, the MAX20408EAFLB/VY+T supports dual-phase operation up to 16A total output. Configuration requires two identical MAX20408EAFLB/VY+T ICs: one as controller (SYNC pulled high), one as target (SYNC tied to SYNCOUT of controller and SYNCOUT tied to BIAS). VEA pins are connected externally to enforce dynamic current sharing, and interleaving is inherently 180° out-of-phase via internal logic - no external timing components needed.
What output voltage options are available for the MAX20408EAFLB/VY+T?
The MAX20408EAFLB/VY+T supports both fixed and adjustable outputs. Fixed options include 3.3V, 4V, and 5V (selected by FB-to-BIAS connection). Adjustable mode uses an external resistor divider on FB to set 0.8V–10V output, with 2.1MHz operation supporting up to 6V and 400kHz supporting up to 10V. Output accuracy is ±1% over temperature for the MAX20408E variant.
How does the windowed PGOOD function differ from standard PGOOD in the MAX20408EAFLB/VY+T?
The MAX20408EAFLB/VY+T implements windowed PGOOD with asymmetric rising/falling thresholds: rising edge asserts high only when VOUT exceeds 105% (typ) of regulation, and falling edge asserts low only when VOUT drops below 104% (typ). This prevents chatter during minor load transients and improves system-level fault discrimination compared to conventional 93%/94% PGOOD windows - a feature exclusive to the MAX20408E/MAX20410E variants.
Is the MAX20408EAFLB/VY+T pin-compatible with other devices in the MAX204xx family?
Yes, the MAX20408EAFLB/VY+T uses the 15-pin FC2QFN package (F153A3FY+3) and is pin-to-pin compatible with MAX20404/MAX20405/MAX20406 (4A–6A family) and MAX20408AFO/MAX20410AFO variants. This allows scalable power design: same PCB footprint supports 4A, 6A, 8A, or 10A buck stages by swapping ICs and adjusting inductor/capacitor values - verified in Analog Devices' reference layouts and land patterns.
MAX20408EAFLB/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-PowerWQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 10V
- 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:
- 15-FC2QFN (3.5x3.75)
MAX20408EAFLB/VY+T FAQ
1.How can I place an order for MAX20408EAFLB/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408EAFLB/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 MAX20408EAFLB/VY+T reliable?
The price and inventory of MAX20408EAFLB/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 MAX20408EAFLB/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20408EAFLB/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408EAFLB/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408EAFLB/VY+T?
MAX20408EAFLB/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408EAFLB/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 MAX20408EAFLB/VY+T?
For technical support, including MAX20408EAFLB/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408EAFLB/VY+T requirements.
6.How does Aetrix verify that MAX20408EAFLB/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20408EAFLB/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 MAX20408EAFLB/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20408EAFLB/VY+T?
All MAX20408EAFLB/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408EAFLB/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 MAX20408EAFLB/VY+T part is unused and in its original packaging.
Return procedure for MAX20408EAFLB/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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