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Analog Devices Inc./Maxim Integrated MAX20408AFOE/VY+T
- Part No.:
- MAX20408AFOE/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOE/VY+T.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,471
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Product details
Overview
MAX20408AFOE/VY+T from Analog Devices is an automotive-grade, fully integrated 36V input, 8A synchronous buck converter with internal high-side and low-side MOSFETs, 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for use in ADAS power rails and infotainment DC-DC stages.
For engineers reviewing the MAX20408AFOE/VY+T datasheet, MAX20408AFOE/VY+T pinout, MAX20408AFOE/VY+T application, or MAX20408AFOE/VY+T equivalent, this page delivers verified package mapping (17-pin FC2QFN), dual-phase capability up to 20A, ±1% output voltage accuracy (MAX20408E variant), windowed PGOOD, and confirmed EN threshold accuracy - all critical for automotive ECU and camera module power design.
Technical Context
The MAX20408AFOE/VY+T implements average current-mode control with 34ns minimum on-time, enabling stable operation across wide VIN/VOUT ratios (e.g., 12V→3.3V or 24V→5V) 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 a 1.8V BIAS linear regulator, high-voltage EN input (3V–42V compatible), programmable soft-start (2.5ms fixed), and robust protection including cycle-by-cycle current limiting, hiccup-mode short-circuit response, thermal shutdown at 175°C, and 42V load-dump tolerance - all validated for -40°C to +125°C ambient operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports full automotive battery range including cold-crank (3V) and load dump (up to 42V absolute max). |
| Max Output Current | 8A continuous - sufficient for powering radar SoCs, display controllers, or multi-core MCU domains in ADAS modules. |
| Quiescent Current | 10μA in skip mode - enables always-on subsystems (e.g., CAN wake-up circuits) to meet ISO 16750-2 standby current limits. |
| Switching Frequency | 2.1MHz or 400kHz - 2.1MHz enables <1μH inductors and compact 0402/0603 ceramic caps; 400kHz improves light-load efficiency. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures tight regulation for sensitive analog supplies (e.g., ADC references, SerDes PLLs). |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 5.5VIN→5VOUT), critical for post-buck LDO replacement in 12V systems. |
| PGOOD Window | 102.75% to 107.25% (rising), 101.75% to 106.25% (falling) - windowed detection prevents false triggers during transient load steps. |
Pinout & Package
MAX20408AFOE/VY+T uses a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 16), symmetric SUP/PGND pin placement for balanced high-current loops, and RoHS-compliant matte-tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable Input | High-voltage compatible (3V–42V); drives IC into shutdown (4μA IQ) when low; accurate UVLO thresholds (0.9V typ enable, 0.7V typ disable) per MAX20408E spec. |
| 2 BST | Bootstrap Supply | Connects 0.1μF ceramic cap to LX; powers high-side gate driver; enables efficient 100% duty-cycle operation. |
| 3, 9 SUP | Power Supply Input | Dual pins internally connected; accepts 3V–36V input; requires local 0.1μF + 4.7μF ceramic bypassing to PGND for stability. |
| 4, 5, 7 PGND | Power Ground | Three dedicated low-impedance ground pins for high-current return paths; must be tied together and connected to thermal pad. |
| 6 LX | Switch Node | Connects to buck inductor; handles peak currents up to 10A RMS; requires tight layout to minimize EMI and ringing. |
| 8 GND | Analog Ground | Separate from PGND; connects to PCB ground plane at single-point star node to isolate noise-sensitive feedback path. |
| 10 BIAS | 1.8V Linear Regulator Output | Powers internal circuitry; requires ≥2.2μF ceramic cap to GND; auto-switches from input to output after startup if VOUT > 2.5V. |
| 11 FB | Feedback Input | Connects to resistor divider for adjustable output (0.8V–10V) or to BIAS for fixed-output configuration (3.3V/4V/5V). |
| 12 OUT | Output Sense | Used only in fixed-output mode (FB tied to BIAS); senses regulated output directly for improved accuracy and load regulation. |
| 13 VEA | Error Amplifier Output | Connected between controller and target in dual-phase setup to enable dynamic current sharing; open in single-phase. |
| 14 PGOOD | Open-Drain Power-Good | Windowed indicator (102.75–107.25% rising, 101.75–106.25% falling); asserts low during soft-start; requires external pull-up. |
| 15 SYNC | Synchronization Input | Selects FPWM (high), skip mode (low), or external clock sync; accepts 360kHz–2.6MHz input; disables internal spread-spectrum. |
| 16 SYNCOUT | 180° Out-of-Phase Clock Output | Configures IC as target in dual-phase (tie to BIAS); connects to SYNC of second IC; open in single-phase operation. |
| 17 NC | No Connect | Thermal pad pin; must be soldered to PCB copper pour for thermal performance (θJCb = 7.7°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Phase Scalability | Two MAX20408AFOE/VY+T ICs support 20A total output with 180° phase shift, dynamic current sharing, and synchronized soft-start - eliminating need for external current-sharing ICs. |
| Ultra-Low Quiescent Current | 10μA in skip mode enables >10-year battery life in always-on automotive modules (e.g., telematics backup power, door module wake logic). |
| Automotive-Grade Protection | 42V load-dump tolerance, -40°C to +125°C operation, AEC-Q100 Grade 1 qualification, and hiccup-mode short-circuit response ensure reliability in harsh vehicle environments. |
| EMI-Optimized Layout | Symmetric SUP/PGND pinout, integrated spread-spectrum (±3% modulation), and minimized high-di/dt loop area reduce radiated emissions without external filters. |
| Fixed or Adjustable Output | Supports both pin-strapped fixed outputs (3.3V/4V/5V) and resistor-programmable 0.8V–10V range - simplifies BOM management across multiple voltage rail requirements. |
Applications
| ADAS Camera Power Supply | Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers 3–5MP image sensor and ISP in forward-facing ADAS camera module requiring clean, low-noise 1.8V/3.3V rails under engine cranking. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 8A peak current with 10μA IQ to maintain always-on wake capability and fast startup (<5ms). Use Value: 99% duty cycle sustains regulation down to 3.3VIN; windowed PGOOD prevents false resets during load transients; AEC-Q100 ensures field reliability. |
Use Scenario: Supplies core voltage (0.8V–1.2V) to quad-core automotive infotainment SoC with dynamic DVFS and burst current demands up to 6A. IC Role / Device Role / Timing Role: High-efficiency buck converter operating at 2.1MHz to minimize inductor size and avoid AM band interference in cabin audio systems. Use Value: 34ns min on-time enables stable 12V→1.0V conversion; ±1% accuracy maintains SoC timing margins; dual-phase option scales to 20A for next-gen platforms. |
| Radar Module LDO Replacement | Body Control Module (BCM) Auxiliary Rail |
|
Use Scenario: Replaces discrete buck + LDO chain in 77GHz radar ECU to reduce solution size and improve thermal performance under hood temperatures. IC Role / Device Role / Timing Role: Single-chip 36V-input buck delivering 5V@4A to MMIC bias and 3.3V@2A to FPGA I/O with independent PGOOD monitoring. Use Value: Integrated high-/low-side FETs (25mΩ/12mΩ RDS(on)) cut conduction losses by 40% vs. discrete solution; 400kHz option optimizes full-load efficiency (95.6% @12V→5V). |
Use Scenario: Generates 5V auxiliary supply for LIN transceivers, LED drivers, and sensor interfaces in body control units with strict EMC and lifetime requirements. IC Role / Device Role / Timing Role: Robust buck converter handling 42V load dump events and operating continuously at +105°C ambient in dashboard enclosures. Use Value: Thermal shutdown (175°C) + hysteresis (20°C) prevents latch-up; spread-spectrum reduces peak EMI by 10dB; FC2QFN package achieves θJB = 16.3°C/W on 4-layer board. |
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+T | 4A rated, same 3.5mm×3.75mm FC2QFN footprint, 36V input, but no dual-phase capability or windowed PGOOD. | Suitable for lower-current domains (e.g., gateway MCU I/O rails) where 8A headroom and advanced fault reporting are unnecessary. | Select when cost sensitivity outweighs scalability needs and 4A output suffices; pin-compatible drop-in for layout reuse. |
| TPS546B24RVFT | 6A, 18V max input, 2.2MHz fixed frequency, no AEC-Q100 rating, different pinout (16-pin QFN), lacks 42V load-dump support. | Targeted at industrial/commercial servers or networking gear - not qualified for automotive under-hood deployment. | Choose only for non-automotive designs requiring higher switching frequency and TI ecosystem support; not a direct replacement. |
Compared with MAX20404ATP/VY+T and TPS546B24RVFT, the MAX20408AFOE/VY+T uniquely combines AEC-Q100 qualification, 8A output, dual-phase scalability, and windowed PGOOD in a thermally optimized FC2QFN - making it the sole fit for safety-critical ADAS power stages demanding long-term reliability and functional safety readiness.
Availability
MAX20408AFOE/VY+T is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power delivery, and body control unit auxiliary rails requiring stable component supply, AEC-Q100 compliance, and long-lifecycle support.
Supply support for MAX20408AFOE/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 since 1965.
The MAX20408/MAX20410 family was designed specifically for automotive power management - delivering high-current, low-IQ, AEC-Q100-compliant buck conversion in minimal PCB area for ADAS, infotainment, and electrification systems.
FAQ
What is the maximum input voltage the MAX20408AFOE/VY+T can withstand during automotive load dump?
The MAX20408AFOE/VY+T supports absolute maximum input voltage of +42V on the SUP pin, meeting ISO 16750-2 Load Dump Pulse 5a requirements. This allows direct connection to 12V automotive batteries without external TVS clamping in most ECU designs. The device remains functional and protected during transient overvoltage events up to this limit, and the internal circuitry is rated for continuous operation at 36V nominal input.
Does the MAX20408AFOE/VY+T support dual-phase operation, and what is required to configure it?
Yes, the MAX20408AFOE/VY+T supports dual-phase operation to deliver up to 20A total output current. To configure it, one IC must be set as controller (SYNCOUT left open, SYNC driven externally or tied high) and the other as target (SYNCOUT tied to BIAS, SYNC connected to controller's SYNCOUT). VEA pins of both ICs are connected together to enable dynamic current sharing, and soft-start is synchronized via shared EN control.
What output voltage options does the MAX20408AFOE/VY+T support, and how is selection implemented?
The MAX20408AFOE/VY+T supports both fixed and adjustable outputs. Fixed options include 3.3V, 4V, and 5V - selected by tying FB to BIAS and using the OUT pin for sensing. Adjustable output ranges from 0.8V to 10V (at 400kHz) or 0.8V to 6V (at 2.1MHz), configured via external resistor divider from OUT to GND. The MAX20408E variant extends the 2.1MHz adjustable range to 10V.
How does the windowed PGOOD function differ in the MAX20408AFOE/VY+T versus standard PGOOD implementations?
The MAX20408AFOE/VY+T implements a true windowed PGOOD: it asserts low only when VOUT falls below 101.75% (falling threshold) or rises above 107.25% (rising threshold) of nominal regulation - unlike standard monotonic PGOOD that triggers only on undervoltage. This prevents nuisance faults during benign overvoltage transients (e.g., line regulation spikes) and improves system robustness in noisy automotive environments.
What thermal performance can be expected from the MAX20408AFOE/VY+T in a typical 4-layer automotive PCB layout?
In a standard 4-layer JEDEC board, the MAX20408AFOE/VY+T achieves θJA = 38.6°C/W and θJB = 16.3°C/W. With proper thermal pad soldering to ≥200mm² internal copper pour, real-world designs achieve junction-to-board resistance near 10°C/W, allowing 8A continuous operation at +85°C ambient with <110°C junction temperature - well within the +150°C absolute max rating and supporting AEC-Q100 Grade 1 operation.
MAX20408AFOE/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- 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 (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+T FAQ
1.How can I place an order for MAX20408AFOE/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOE/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 MAX20408AFOE/VY+T reliable?
The price and inventory of MAX20408AFOE/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 MAX20408AFOE/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20408AFOE/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOE/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOE/VY+T?
MAX20408AFOE/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOE/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 MAX20408AFOE/VY+T?
For technical support, including MAX20408AFOE/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOE/VY+T requirements.
6.How does Aetrix verify that MAX20408AFOE/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOE/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 MAX20408AFOE/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20408AFOE/VY+T?
All MAX20408AFOE/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOE/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 MAX20408AFOE/VY+T part is unused and in its original packaging.
Return procedure for MAX20408AFOE/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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