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Analog Devices Inc./Maxim Integrated MAX20408AFOC/VY+
- Part No.:
- MAX20408AFOC/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOC/VY+.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:174
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Product details
Overview
MAX20408AFOC/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 MAX20408AFOC/VY+ datasheet, MAX20408AFOC/VY+ pinout, MAX20408AFOC/VY+ application, or MAX20408AFOC/VY+ equivalent, key selection criteria include AEC-Q100 qualification, 99% dropout duty cycle, ±1% output voltage accuracy (E-version), windowed PGOOD, and FC2QFN thermal performance for under-hood automotive designs.
Technical Context
The MAX20408AFOC/VY+ implements average current-mode control with 34ns minimum on-time, enabling stable operation across wide VIN/VOUT ratios (3V–36V input, 0.8V–10V adjustable output). It supports three SYNC modes: forced-PWM, skip mode, and external clock synchronization - with spread-spectrum EMI reduction enabled as a factory option.
Dual-phase configuration uses VEA coupling and 180° out-of-phase SYNCOUT to achieve dynamic current sharing between controller and target ICs. Thermal protection includes +175°C shutdown with 20°C hysteresis, and robust fault handling via hiccup-mode short-circuit protection and valley-current limiting.
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 thermally enhanced 3.5mm × 3.75mm 17-pin FC2QFN package (θJA = 27°C/W on EV kit). |
| Quiescent Current | 10μA in skip mode - enables always-on subsystems (e.g., body control modules) without battery drain. |
| Switching Frequency | 2.1MHz or 400kHz - enables compact 1.0μH inductors and <10μF ceramic output capacitors; avoids AM band interference. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures precise rail regulation for sensitive SoCs and image sensors in ADAS cameras. |
| Duty Cycle Max | 99% - maintains regulation during low-VIN dropout (e.g., 5V out from 5.05V input), critical for post-ignition hold-up. |
| PGOOD Logic | Windowed (102.75%–107.25% rising / 101.75%–106.25% falling) - detects overvoltage and undervoltage faults independently for functional safety monitoring. |
Pinout & Package
MAX20408AFOC/VY+ uses a thermally optimized 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 16), symmetric SUP/PGND layout for low-EMI current loops, and RoHS-compliant "VY+" suffix indicating lead-free, halogen-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable Input | High-voltage compatible (3V–42V tolerant); asserts internal UVLO at 2.7V (falling) - enables direct battery connection without level-shifting. |
| 2 BST | Bootstrap Supply | Drives high-side gate; requires 0.1μF ceramic capacitor to LX - enables efficient 100% duty-cycle operation. |
| 3, 9 SUP | Power Supply Input | Dual-input pins internally tied; bypassed with 0.1μF + 4.7μF ceramics - reduces input ripple and improves transient response. |
| 4, 5, 7 PGND | Power Ground | Three dedicated low-impedance ground returns for high di/dt paths - minimizes ground bounce and EMI in high-current switching. |
| 6 LX | Switch Node | Connects to buck inductor; high-impedance when disabled - enables seamless power sequencing in multi-rail systems. |
| 8 GND | Analog Ground | Separate from PGND; connected via star point to PCB ground plane - isolates noise-sensitive feedback and error amplifier circuits. |
| 10 BIAS | 1.8V Linear Regulator Output | Powers internal circuitry; requires ≥2.2μF ceramic to GND - self-biasing eliminates need for external LDO in space-constrained layouts. |
| 11 FB | Feedback Input | Programs output voltage via resistor divider (0.8V–10V range) or ties to BIAS for fixed outputs - supports both precision and simplified configurations. |
| 12 OUT | Output Sense | Used only when FB connects to BIAS - enables remote sensing for improved load regulation in long-trace applications. |
| 13 VEA | Error Amplifier Output | Connected between controller/target in dual-phase mode - enables real-time current balancing and phase interleaving without external ICs. |
| 14 PGOOD | Open-Drain Power-Good | Windowed assertion (101.75%–107.25%) - provides fail-safe status for MCU watchdog or system power manager without additional comparators. |
| 15 SYNC | Synchronization Input | Selects FPWM (high), skip mode (low), or external clock sync - allows system-level timing coordination across multiple converters. |
| 16 SYNCOUT | 180° Out-of-Phase Clock | Configures IC as target when tied to BIAS; drives second IC's SYNC pin - enables seamless dual-phase expansion with no external timing controller. |
| 17 NC | No Connect | Thermal pad connection point - must be soldered to PCB thermal plane for θJCb = 7.7°C/W performance and +125°C ambient operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase scalability | Two MAX20408AFOC/VY+ ICs deliver 20A with dynamic current sharing and 180° interleaving - eliminates need for discrete current-sharing resistors or master-slave controllers. |
| Automotive robustness | AEC-Q100 Grade 1 (−40°C to +125°C), 42V load-dump tolerance, and hiccup-mode short-circuit protection - meets ISO 7637-2 pulse 5a requirements without external TVS. |
| Ultra-low IQ operation | 10μA quiescent current in skip mode - extends battery life in parked-mode applications (e.g., telematics wake-on-LIN) beyond 30 days. |
| EMI-optimized architecture | Symmetric SUP/PGND pinout + spread-spectrum (±3% modulation) - reduces peak radiated emissions by >10dB in 30–1000MHz CISPR 25 Class 5 testing. |
| Thermally enhanced FC2QFN | 3.5mm × 3.75mm footprint with bottom-exposed thermal pad - achieves 95.6% efficiency at 12VIN/5VOUT/400kHz and 12W dissipation at +70°C ambient. |
Applications
| ADAS Camera Power Supply | Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers 5MP image sensor and ISP in front-facing ADAS camera module operating in −40°C to +105°C under-hood environment. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator with windowed PGOOD monitoring and 99% dropout support during engine cranking. Use Value: ±1% output accuracy ensures consistent ADC reference and pixel gain calibration; 10μA IQ enables always-on vision wake-up without draining 12V battery. |
Use Scenario: Supplies 1.1V core voltage to quad-core automotive infotainment SoC with dynamic DVFS and burst-mode GPU loads. IC Role / Device Role / Timing Role: High-efficiency, fast-transient buck converter with 2.1MHz switching and soft-start ramp control. Use Value: 34ns minimum on-time enables stable 1.1V/8A regulation from 12V input; dual-phase capability handles 15A peak GPU loads without voltage droop. |
| Body Control Module (BCM) Subsystem | Automotive Gateway ECU Power |
|
Use Scenario: Generates 5V auxiliary rail for LIN transceivers, EEPROM, and CAN FD PHY in zone-controller BCM with 15-year lifetime requirement. IC Role / Device Role / Timing Role: Always-on, low-IQ buck converter with AEC-Q100 qualification and thermal shutdown protection. Use Value: 4μA shutdown current and −40°C to +125°C operation ensure 15-year field reliability; FC2QFN package withstands 2000+ thermal cycles per JEDEC JESD22-A104. |
Use Scenario: Provides isolated 3.3V supply for gateway MCU and Ethernet PHY in 10Gbps automotive backbone network. IC Role / Device Role / Timing Role: Dual-phase configured MAX20408AFOC/VY+ pair delivering 20A with synchronized switching and EMI filtering. Use Value: Spread-spectrum + interleaved phases reduce common-mode noise on shared 12V bus - prevents packet loss in time-sensitive TSN Ethernet traffic. |
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 |
|---|---|---|---|
| MAX20408AFOC/V+ | Same 17-pin FC2QFN package and pinout; non-E version with ±1.5% VOUT accuracy and standard PGOOD (92%–96% window). | Lacks windowed PGOOD and EN threshold accuracy - suitable for non-safety-critical 5V/3.3V rails where cost sensitivity outweighs functional safety requirements. | Select MAX20408AFOC/V+ for cost-optimized infotainment USB hub supplies where ±1.5% regulation suffices and PGOOD windowing is unnecessary. |
| TPS62933RGER | 30V, 8A buck with 15μA IQ, 1.8MHz switching, but no dual-phase support or AEC-Q100 Grade 1 rating (only Grade 3). | Rated for −40°C to +105°C only; lacks 42V load-dump support and windowed PGOOD - limited to cabin interior applications. | Choose TPS62933RGER for non-under-hood, non-ADAS applications like rear-seat entertainment where extended temperature and automotive transients are not required. |
Compared with MAX20408AFOC/VY+, the MAX20408AFOC/V+ offers identical form-factor and basic functionality at lower cost but reduced accuracy and fault detection; TPS62933RGER provides competitive efficiency and size but lacks automotive qualification depth and dual-phase scalability needed for next-gen E/E architectures.
Availability
MAX20408AFOC/VY+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power delivery, and body control module subsystems requiring stable component supply across extended temperature and high-reliability production programs.
Supply support for MAX20408AFOC/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 AEC-Q100-qualified power solutions.
The MAX20408AFOC/VY+ belongs to Analog Devices' automotive power management portfolio, designed specifically for high-current, low-IQ, thermally constrained DC-DC conversion in ADAS, infotainment, and zonal ECU applications.
FAQ
What is the maximum input voltage transient the MAX20408AFOC/VY+ can withstand?
The MAX20408AFOC/VY+ supports 42V load-dump transients per ISO 7637-2 Pulse 5a, with absolute maximum ratings specifying SUP-to-PGND up to +42V. Its internal high-side switch and protection circuitry maintain functionality during these events without external clamping components - a key requirement for under-hood automotive deployment where MAX20408AFOC/VY+ is commonly used.
Does the MAX20408AFOC/VY+ support dual-phase operation out of the box?
Yes, the MAX20408AFOC/VY+ natively supports dual-phase operation using its VEA and SYNCOUT pins. One IC is configured as controller (SYNCOUT left open), the other as target (SYNCOUT tied to BIAS), enabling 180° interleaving and dynamic current sharing - no external phase controller or timing IC is required for MAX20408AFOC/VY+ dual-phase implementation.
What is the purpose of the windowed PGOOD feature in the MAX20408AFOC/VY+?
The windowed PGOOD in MAX20408AFOC/VY+ asserts low when output voltage falls below 101.75% or rises above 107.25% of nominal - detecting both undervoltage and overvoltage faults independently. This dual-threshold behavior supports ASIL-B functional safety monitoring in ADAS power supplies, unlike standard PGOOD that only monitors undervoltage.
Can the MAX20408AFOC/VY+ operate with a 2.1MHz switching frequency and still achieve high efficiency?
Yes, the MAX20408AFOC/VY+ achieves up to 94.3% efficiency at 12VIN/5VOUT with 2.1MHz switching, enabled by low RDS(ON) (25mΩ HS / 12mΩ LS) and optimized gate drive. Its 34ns minimum on-time preserves regulation stability even at high step-down ratios, making MAX20408AFOC/VY+ suitable for compact, high-density automotive power designs.
Is the MAX20408AFOC/VY+ pin-compatible with earlier Analog Devices buck converters?
Yes, the MAX20408AFOC/VY+ uses the same 17-pin FC2QFN footprint and pinout as the MAX20404/MAX20405/MAX20406 family, enabling drop-in upgrades from 4A–6A to 8A capability without PCB redesign - a key advantage for automotive Tier 1s scaling power delivery in existing platforms while maintaining MAX20408AFOC/VY+ compatibility.
MAX20408AFOC/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):
- 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)
MAX20408AFOC/VY+ FAQ
1.How can I place an order for MAX20408AFOC/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOC/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 MAX20408AFOC/VY+ reliable?
The price and inventory of MAX20408AFOC/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOC/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOC/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOC/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOC/VY+?
MAX20408AFOC/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOC/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 MAX20408AFOC/VY+?
For technical support, including MAX20408AFOC/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOC/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOC/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOC/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 MAX20408AFOC/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOC/VY+?
All MAX20408AFOC/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOC/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 MAX20408AFOC/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOC/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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