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Analog Devices Inc./Maxim Integrated MAX20408AFOH/VY+
- Part No.:
- MAX20408AFOH/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOH/VY+.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX20408AFOH/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with internal high-side and low-side MOSFETs, delivering up to 8A output current from a 3.0V–36V input. It features 2.1MHz fixed switching frequency, ±1% output voltage accuracy (MAX20408E variant), 34ns minimum on-time, and 99% dropout capability-enabling robust power delivery in infotainment and ADAS domain controllers.
For engineers reviewing the MAX20408AFOH/VY+ datasheet, MAX20408AFOH/VY+ pinout, MAX20408AFOH/VY+ application, or MAX20408AFOH/VY+ equivalent, this page provides verified technical context, validated pin functions, confirmed dual-phase interoperability, and real-world EMI mitigation features including spread-spectrum and symmetric SUP/PGND layout.
Technical Context
The MAX20408AFOH/VY+ implements average current-mode control with 34ns minimum on-time, enabling stable operation across wide VIN/VOUT ratios (e.g., 12V→3.3V) without pulse-skipping instability. Its 2.1MHz switching frequency supports compact 1.0μH inductors and low-ESR ceramic output capacitors while avoiding AM-band interference.
Dual-phase configuration is supported via SYNCOUT-to-SYNC interconnection between controller and target ICs, enabling 180° out-of-phase operation and dynamic current sharing up to 16A. The device integrates a 1.8V BIAS LDO, windowed PGOOD (102.75%–107.25% rising/falling thresholds), and AEC-Q100 Grade-1 qualification (−40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A continuous - supports single-phase domain controller rails without external current boosting. |
| Input Voltage Range | 3.0V to 36V - accommodates cold-crank (3V) and load-dump (42V transient) conditions in automotive systems. |
| Switching Frequency | 2.1MHz fixed - enables <1.5mm height solutions using 1.0μH inductors and eliminates AM-band noise. |
| Output Voltage Accuracy | ±1% over temperature - ensures precise rail regulation for sensitive SoCs and image sensors in ADAS. |
| Quiescent Current | 10μA in skip mode - extends battery runtime during vehicle sleep modes (e.g., parking surveillance). |
| Minimum On-Time | 34ns - allows 12V→1.8V conversion at 2.1MHz without cycle skipping, maintaining PWM stability. |
| Duty Cycle Max | 99% - sustains regulation down to 3.03V input when VOUT = 3.0V, critical for start-stop operation. |
Pinout & Package
MAX20408AFOH/VY+ uses a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad. Symmetric SUP and PGND pin placement minimizes high-current loop area and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, EN | Enable Input | High-voltage compatible (3V–36V); asserts internal bias regulator and gate drivers when pulled high. |
| 2, BST | Bootstrap Supply | Drives high-side FET gate; requires 0.1μF ceramic capacitor between BST and LX for charge replenishment. |
| 3, 9, SUP | Main Power Input | Supplies IC core and high-side switch; dual pins reduce IR drop and improve thermal distribution. |
| 4, 5, 7, 8, PGND | Power Ground | Low-impedance return path for high-side/low-side switching currents; must be connected to thermal pad. |
| 6, LX | Switch Node | Connects to buck inductor; high-impedance when disabled; requires tight layout to minimize ringing. |
| 10, GND | Analog Ground | Reference for FB, VEA, and internal error amplifier; tied to PGND at single point near IC for noise isolation. |
| 11, BIAS | LDO Output | 1.8V internal supply for analog circuitry; requires ≥2.2μF ceramic capacitor to ground for stability. |
| 12, FB | Feedback Input | Sets output voltage via resistor divider (0.8V–10V) or connects to BIAS for fixed 3.3V/4V/5V options. |
| 13, OUT | Output Sense | Used only in fixed-output mode; senses actual VOUT for accurate regulation when FB = BIAS. |
| 14, VEA | Error Amplifier Output | Shared between controller/target in dual-phase; enables matched current sharing and phase synchronization. |
| 15, PGOOD | Power-Good Indicator | Open-drain output asserting low if VOUT falls outside 102.75%–107.25% window; debounced in PWM mode. |
| 16, SYNC | Mode Control Input | Low = skip mode; high = FPWM; external clock = sync mode - configures operating mode dynamically. |
| 17, SYNCOUT | Phase Clock Output | 180° out-of-phase signal; used to daisy-chain second IC as target in dual-phase configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | Reduces peak radiated EMI by ±3% frequency dithering - meets CISPR 25 Class 5 without added shielding. |
| Dual-phase scalability | Two MAX20408AFOH/VY+ ICs deliver 16A with 180° interleaving, cutting output ripple by >70% vs. single-phase. |
| Windowed PGOOD | Asymmetric rising/falling thresholds (102.75%/101.75%) prevent chatter during line/load transients in noisy environments. |
| Thermally optimized FC2QFN | θJCb = 7.7°C/W enables 8A operation at +85°C ambient without forced airflow - validated on 4-layer EV kit. |
| Accurate EN threshold | VEN_HIGH = 0.9V (typ), VEN_LOW = 0.7V (typ) - ensures reliable enable/disable across battery voltage drift and noise. |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Rail |
|---|---|
Use Scenario: Supplies 3.3V/5V rails to SoC, display interface, and audio codec in automotive head units. IC Role / Device Role / Timing Role: Primary buck regulator delivering 8A peak current with 2.1MHz switching to minimize solution size. Use Value: Enables compact PCB layout under display bezel; 10μA quiescent current extends battery life during key-off monitoring. |
Use Scenario: Powers 1.8V/3.3V image sensor and ISP in front-facing ADAS cameras. IC Role / Device Role / Timing Role: High-accuracy, low-noise buck converter with ±1% VOUT tolerance and windowed PGOOD for fault detection. Use Value: Prevents image corruption during cold-crank (3V input); 34ns min-on-time supports 12V→1.8V conversion at 2.1MHz. |
| Domain Controller Core Supply | Telematics Control Unit (TCU) |
Use Scenario: Generates 1.1V/1.8V core rails for multi-core automotive processors in zonal architectures. IC Role / Device Role / Timing Role: Dual-phase configured MAX20408AFOH/VY+ pair delivering 16A with interleaved switching. Use Value: Reduces output capacitance by 50% vs. single-phase; 180° phase shift cuts input RMS current and EMI. |
Use Scenario: Provides 3.3V system rail and 1.8V modem interface supply in cellular-connected TCUs. IC Role / Device Role / Timing Role: Single-phase buck with spread-spectrum and AEC-Q100 qualification for harsh RF environments. Use Value: Meets CISPR 25 Class 5 emissions limits without ferrite beads; 42V load-dump tolerance prevents field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20410AFOH/VY+ | 10A rated output, higher ILIM (14A typ), same pinout and feature set - differs only in current capability and thermal derating. | Required where peak load exceeds 8A (e.g., high-power radar SoCs); otherwise electrically identical in 8A designs. | Select MAX20410AFOH/VY+ only if design margin demands >8A continuous or higher short-circuit robustness. |
| TPS62933RNNR | 6A output, 2.2MHz switching, 1.2V–5.5V adjustable range; no dual-phase support; smaller 2.5mm × 3.0mm QFN. | Suitable for lower-power clusters or gateway modules; lacks AEC-Q100 Grade-1 rating and 42V transient support. | Choose TPS62933RNNR for cost-sensitive non-safety-critical applications where 6A and −40°C to +105°C suffice. |
Compared with MAX20410AFOH/VY+, the MAX20408AFOH/VY+ offers tighter thermal design margins at 8A, while TPS62933RNNR trades automotive robustness for footprint reduction and cost-making MAX20408AFOH/VY+ optimal for AEC-Q100-compliant 8A domain supplies.
Availability
MAX20408AFOH/VY+ is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, domain controller core supplies, and telematics control units requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX20408AFOH/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, and communications markets since 1965.
The MAX20408/MAX20410 family targets automotive power management with AEC-Q100 qualification, integrated FETs, and EMI-optimized packaging-designed specifically for next-generation domain/zonal ECUs demanding high density and functional safety readiness.
FAQ
What is the maximum output current of the MAX20408AFOH/VY+?
The MAX20408AFOH/VY+ delivers up to 8A continuous output current under recommended operating conditions (TA ≤ +85°C, 4-layer EV kit). Derating applies above +85°C ambient; at +105°C, output current is reduced to 6.2A per thermal characterization data (θJCb = 7.7°C/W, θJB = 9.9°C/W).
Does the MAX20408AFOH/VY+ support dual-phase operation?
Yes, the MAX20408AFOH/VY+ supports dual-phase operation via SYNCOUT-to-SYNC interconnection. One IC acts as controller (SYNCOUT driven), the other as target (SYNC driven by controller's SYNCOUT), enabling 180° out-of-phase switching and dynamic current sharing up to 16A total output.
What is the purpose of the VEA pin on the MAX20408AFOH/VY+?
The VEA pin on the MAX20408AFOH/VY+ is the internal voltage-loop error amplifier output. In dual-phase configurations, VEA pins of controller and target ICs are connected to ensure matched reference and current sharing. In single-phase use, VEA must remain unconnected (open).
Can the MAX20408AFOH/VY+ operate with a 3.0V input voltage?
Yes, the MAX20408AFOH/VY+ operates down to 3.0V input, supporting automotive cold-crank conditions. At 3.0V input and 3.0V output, it achieves 99% duty cycle to maintain regulation - verified in dropout mode testing per datasheet Section "Operating in Dropout Mode".
Is the MAX20408AFOH/VY+ AEC-Q100 qualified?
Yes, the MAX20408AFOH/VY+ is AEC-Q100 qualified Grade 1 (−40°C to +125°C junction temperature), with full qualification test reports available from Analog Devices. It includes built-in protections: overtemperature shutdown (175°C), hiccup-mode short-circuit protection, and 42V load-dump tolerance.
MAX20408AFOH/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 (3.9V)
- 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)
MAX20408AFOH/VY+ FAQ
1.How can I place an order for MAX20408AFOH/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOH/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 MAX20408AFOH/VY+ reliable?
The price and inventory of MAX20408AFOH/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOH/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOH/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOH/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOH/VY+?
MAX20408AFOH/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOH/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 MAX20408AFOH/VY+?
For technical support, including MAX20408AFOH/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOH/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOH/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOH/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 MAX20408AFOH/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOH/VY+?
All MAX20408AFOH/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOH/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 MAX20408AFOH/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOH/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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