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Analog Devices Inc./Maxim Integrated MAX20408EAFLB/VY+
- Part No.:
- MAX20408EAFLB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-PowerWQFN
- Datasheet:
-
MAX20408EAFLB/VY+.pdf
- Description:
- IC REG BUCK ADJ 8A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:420
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Product details
Overview
MAX20408EAFLB/VY+ from Analog Devices is an automotive-grade, fully integrated 36V input, 8A synchronous buck converter with internal high-side and low-side MOSFETs, 2.1MHz fixed switching frequency, ±1% output voltage accuracy, and windowed PGOOD. It operates down to 3.0V input, supports 99% duty cycle for low-dropout operation, and delivers regulated power to ADAS camera modules and infotainment SoCs.
For engineers reviewing the MAX20408EAFLB/VY+ datasheet, MAX20408EAFLB/VY+ pinout, MAX20408EAFLB/VY+ application, or MAX20408EAFLB/VY+ equivalent, key selection criteria include its AEC-Q100 qualification, 10μA quiescent current in skip mode, thermally enhanced 15-pin FC2QFN package (3.5mm × 3.75mm), and dual-phase capability enabling scalable 16A designs.
Technical Context
The MAX20408EAFLB/VY+ 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 2.1MHz switching frequency minimizes external component size while avoiding AM band interference.
It features a symmetric SUP/PGND pinout for balanced high-current loop routing, integrated 1.8V BIAS LDO with 2.2μF output capacitor requirement, and programmable EN threshold (0.825V–0.975V) for precise UVLO configuration in automotive battery systems.
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 multi-core ADAS processors or display timing controllers without external current boosting. |
| Switching Frequency | 2.1MHz fixed - enables use of ≤1μH inductors and compact ceramic output capacitors; avoids 530–1710kHz AM radio band. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable supply to sensitive analog front-ends and SerDes PHYs in camera links. |
| Quiescent Current | 10μA in skip mode - extends battery runtime during vehicle sleep mode (e.g., parking surveillance). |
| Thermal Performance | θJCb = 10.52°C/W (4-layer EV kit) - enables full 8A operation at +85°C ambient without forced airflow. |
| Protection Features | Overtemperature shutdown (175°C), hiccup-mode short-circuit protection, and 99% dropout operation - meets ASIL-B functional safety readiness. |
Pinout & Package
MAX20408EAFLB/VY+ uses a thermally enhanced 15-pin FC2QFN package (3.5mm × 3.75mm, 0.5mm pitch) with exposed thermal pad. Symmetric SUP/PGND pin placement minimizes high-frequency loop area and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 7 | PGND | Power ground return for high-side/low-side switch currents; must be connected to solid internal ground plane for thermal and EMI integrity. |
| 3, 9 | SUP | Main IC supply and high-side FET source; requires local 0.1μF + 4.7μF ceramic decoupling to PGND for stability under fast load transients. |
| 5 | LX | Switch node connecting to buck inductor; high dv/dt node requiring tight layout to minimize EMI and ringing. |
| 6 | BIAS | 1.8V internal LDO output; powers internal logic and requires ≥2.2μF ceramic capacitor to GND for loop stability. |
| 8 | GND | Analog ground reference; tied to PGND at single point near device to avoid noise coupling into feedback path. |
| 10 | FB | Feedback input for adjustable output; connect to resistor divider (0.8V–10V range) or tie to BIAS for fixed 3.3V/4V/5V options. |
| 11 | OUT | Output voltage sense input used only when FB is tied to BIAS; enables accurate regulation without external divider loading. |
| 12 | VEA | Error amplifier output; connected between controller and target ICs in dual-phase configuration for dynamic current sharing. |
| 13 | PGOOD | Windowed open-drain power-good indicator; asserts low if VOUT falls outside 101.75%–107.25% (rising) or 101.75%–106.25% (falling) of nominal. |
| 14 | SYNC | Mode control and synchronization input; low = skip mode, high = FPWM, external clock = sync mode - configures operating behavior without reprogramming. |
| 15 | SYNCOUT | 180° out-of-phase clock output; used to daisy-chain second IC as target in dual-phase setup; left open in single-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed PGOOD | Provides asymmetric rising/falling thresholds (102.75%–107.25% / 101.75%–106.25%) to prevent chatter during marginal output conditions in automotive environments. |
| Accurate EN Threshold | EN high-level threshold tightly specified at 0.825V–0.975V (typ), enabling robust start-up control directly from automotive battery monitoring circuits. |
| Dual-Phase Scalability | Two MAX20408EAFLB/VY+ ICs can be configured as controller/target with 180° phase shift and dynamic current sharing - delivers up to 16A with reduced input/output ripple. |
| Spread-Spectrum Option | Reduces peak radiated EMI by ±3% frequency modulation - simplifies EMC compliance testing for CISPR 25 Class 5 automotive applications. |
| Thermally Optimized FC2QFN | Low θJCb (10.52°C/W) and symmetric SUP/PGND pinout reduce thermal resistance and improve current-loop balance for consistent efficiency across temperature. |
Applications
| ADAS Camera Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers 5MP image sensor and ISP in rear-view or surround-view camera module with strict EMI limits and cold-crank support. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering clean, low-noise power with windowed PGOOD for system health monitoring. Use Value: 2.1MHz operation eliminates need for large LC filters; ±1% accuracy maintains sensor ADC reference stability; AEC-Q100 ensures reliability over 15-year vehicle life. |
Use Scenario: Supplies core voltage to quad-core application processor in head-unit with dynamic load steps up to 6A. IC Role / Device Role / Timing Role: High-efficiency, low-IQ DC-DC converter supporting deep-sleep modes and rapid wake-up response. Use Value: 10μA quiescent current extends battery reserve time; 94.3% efficiency at 12VIN/5VOUT reduces thermal load on PCB; dual-phase option scales to 16A for next-gen SoCs. |
| Automotive Telematics Module | Industrial Vehicle Control Unit |
Use Scenario: Regulates power for LTE/C-V2X modem and GNSS receiver in telematics control unit exposed to wide temperature and vibration. IC Role / Device Role / Timing Role: Input-hardened buck converter handling 42V load-dump transients and -40°C to +125°C ambient operation. Use Value: 99% duty cycle supports 3.0V cold-crank; spread-spectrum EMI reduction meets stringent automotive RF coexistence requirements; EN threshold accuracy enables precise brown-out detection. |
Use Scenario: Provides stable 5V rail for microcontroller, CAN transceivers, and analog sensors in off-highway equipment control box. IC Role / Device Role / Timing Role: Robust industrial-grade buck converter with hiccup-mode short-circuit protection and thermal shutdown. Use Value: Overtemperature and short-circuit protection prevents field failures; 36V max input accommodates 24V battery systems with alternator spikes; FC2QFN package withstands mechanical shock and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20410EAFLB/VY+ | 10A rated output, higher ILIM (11.9A–16A), same 15-pin FC2QFN package and pinout. | Required where peak load exceeds 8A (e.g., radar SoC with pulsed TX), otherwise identical functionality and layout compatibility. | Select MAX20410EAFLB/VY+ when >8A continuous current or higher short-circuit robustness is needed; no PCB change required. |
| TPS546B24RVFT | 6V–18V input, 15A output, 500kHz–2.2MHz programmable frequency, but not AEC-Q100 qualified. | Targeted at industrial/commercial servers or telecom; lacks automotive transient immunity and extended temperature validation. | Consider TPS546B24RVFT only for non-automotive applications requiring higher current; MAX20408EAFLB/VY+ remains mandatory for ASIL-B systems. |
Compared with MAX20410EAFLB/VY+, the MAX20408EAFLB/VY+ offers optimized cost and thermal margin for 8A loads, while TPS546B24RVFT provides higher current but sacrifices automotive qualification and input voltage range - making MAX20408EAFLB/VY+ the only drop-in solution for AEC-Q100-compliant 8A automotive rails.
Availability
MAX20408EAFLB/VY+ is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and telematics applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX20408EAFLB/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 since 1965.
The MAX20408/MAX20410 family targets automotive power management with integrated high-current buck conversion, AEC-Q100 qualification, and EMI-optimized packaging - designed specifically for ADAS, infotainment, and body electronics subsystems.
FAQ
What is the maximum input voltage rating for MAX20408EAFLB/VY+?
The MAX20408EAFLB/VY+ has an absolute maximum input voltage rating of +42V on the SUP pin, enabling robust operation during automotive load-dump events. Its recommended operating input range is 3.0V to 36V, covering cold-crank (3V) through normal 12V/24V battery operation. This rating is validated per AEC-Q100 stress test conditions and confirmed in the Absolute Maximum Ratings table.
Does MAX20408EAFLB/VY+ support fixed-output voltage configurations?
Yes, MAX20408EAFLB/VY+ supports fixed-output voltages of 3.3V, 4V, or 5V by connecting the FB pin to the BIAS pin. When configured this way, the OUT pin is used for output sensing to achieve ±1% regulation accuracy without external resistor dividers - simplifying design and improving noise immunity in automotive applications.
How does the windowed PGOOD function differ in MAX20408EAFLB/VY+ versus standard PGOOD?
The MAX20408EAFLB/VY+ implements a windowed PGOOD with asymmetric thresholds: rising edge triggers at 102.75%–107.25% of nominal VOUT, and falling edge releases at 101.75%–106.25%. This hysteresis prevents false toggling during marginal output conditions, unlike standard PGOOD which typically uses symmetric 93%/94% thresholds - critical for reliable system boot sequencing in automotive ECUs.
Can MAX20408EAFLB/VY+ operate in dual-phase mode with another MAX20408EAFLB/VY+?
Yes, two MAX20408EAFLB/VY+ ICs can be configured in dual-phase mode: one as controller (SYNCOUT connected to SYNC of second IC), the other as target (SYNCOUT tied to BIAS). This enables 16A total output with 180° phase shift, dynamic current sharing, and reduced input/output ripple - all using identical MAX20408EAFLB/VY+ devices without firmware or external controllers.
What thermal performance can be expected from MAX20408EAFLB/VY+ in a 4-layer PCB design?
In a 4-layer evaluation board layout, MAX20408EAFLB/VY+ achieves θJCb = 10.52°C/W and θJB = 12.53°C/W. At 8A load and 12VIN/5VOUT, junction temperature rise is approximately 42°C above ambient - allowing full-rated operation up to +85°C ambient without derating. The exposed thermal pad must be soldered to a minimum 100mm² copper pour for optimal performance.
MAX20408EAFLB/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-PowerWQFN
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for MAX20408EAFLB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408EAFLB/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 MAX20408EAFLB/VY+ reliable?
The price and inventory of MAX20408EAFLB/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20408EAFLB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408EAFLB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408EAFLB/VY+?
MAX20408EAFLB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408EAFLB/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 MAX20408EAFLB/VY+?
For technical support, including MAX20408EAFLB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408EAFLB/VY+ requirements.
6.How does Aetrix verify that MAX20408EAFLB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408EAFLB/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 MAX20408EAFLB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408EAFLB/VY+?
All MAX20408EAFLB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408EAFLB/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 MAX20408EAFLB/VY+ part is unused and in its original packaging.
Return procedure for MAX20408EAFLB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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