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Analog Devices Inc./Maxim Integrated MAX20408AFOC/VY+T
- Part No.:
- MAX20408AFOC/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOC/VY+T.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,444
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Product details
Overview
MAX20408AFOC/VY+T 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 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, ±1% output voltage accuracy (E-grade), and AEC-Q100 qualification for use in ADAS power rails.
For engineers reviewing the MAX20408AFOC/VY+T datasheet, MAX20408AFOC/VY+T pinout, MAX20408AFOC/VY+T application, or MAX20408AFOC/VY+T equivalent, this device supports dual-phase 20A configurations, 99% dropout operation, spread-spectrum EMI reduction, and windowed PGOOD monitoring - critical for robust automotive power design validation.
Technical Context
The MAX20408AFOC/VY+T implements average current-mode control with 34ns minimum on-time, enabling stable regulation across wide VIN/VOUT ratios (e.g., 24V→3.3V) without pulse-skipping instability. Its dual-phase capability uses VEA coupling and SYNCOUT-to-SYNC interconnection to achieve dynamic current sharing and precise 180° phase alignment between controller and target ICs.
It integrates a 1.8V BIAS linear regulator with automatic switchover from input to output, symmetric SUP/PGND pin placement for balanced high-current loops, and factory-enabled spread-spectrum modulation (±3% around fSW) to reduce peak radiated emissions - all within a thermally enhanced 3.5mm × 3.75mm FC2QFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports cold-crank (4.5V) and load-dump (42V transient) conditions in automotive systems. |
| Max Output Current | 8A - sufficient for powering radar SoCs, camera modules, or infotainment processors without external current boosting. |
| Quiescent Current | 10μA in skip mode - enables always-on subsystems (e.g., body control modules) to meet ISO 16750-2 standby current limits. |
| Switching Frequency | 2.1MHz or 400kHz - 2.1MHz allows <1μH inductors and <22μF ceramic output 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 down to ~0.36V dropout at 8A (e.g., 12V→12V during cranking). |
| Thermal Rating | -40°C to +125°C ambient, AEC-Q100 Grade 1 - qualified for under-hood and cockpit-mounted applications. |
Pinout & Package
MAX20408AFOC/VY+T is housed in a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 17 = PGND). Symmetric SUP and PGND pin placement minimizes high-current loop area and improves EMI performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EN | High-voltage enable input (3V–36V compatible); drives IC into shutdown (4μA IQ) when low. |
| 2 | BST | Bootstrap supply for high-side gate driver; requires 0.1μF ceramic cap to LX. |
| 3, 9 | SUP | Main IC supply and high-side switch rail; bypassed with 0.1μF + 4.7μF ceramics to PGND. |
| 4, 5, 7 | PGND | Power ground return for high-current paths (LX, SUP); must be low-impedance plane connection. |
| 6 | LX | Switch node connecting to buck inductor; high-impedance when disabled. |
| 8 | GND | Analog ground reference; connected to PGND at single point near IC for noise isolation. |
| 11 | BIAS | 1.8V internal LDO output; powers internal circuitry; requires ≥2.2μF ceramic to GND. |
| 12 | FB | Feedback input for adjustable output (0.8V–10V); tied to BIAS for fixed-output configuration. |
| 13 | OUT | Output voltage sense input used with FB-to-BIAS fixed-output mode. |
| 14 | VEA | Error amplifier output; connected between controller/target in dual-phase for current sharing. |
| 15 | PGOOD | Open-drain power-good indicator with windowed threshold (102.75%–107.25% rising, 101.75%–106.25% falling). |
| 16 | SYNC | Mode control and external clock sync input; low = skip mode, high = FPWM, AC signal = sync source. |
| 17 | SYNCOUT | 180° out-of-phase clock output; used to configure target IC in dual-phase setup. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase 20A scalability | Two MAX20408AFOC/VY+T ICs can be configured as controller/target with dynamic current sharing and 180° phase shift - no external phase-control IC required. |
| Windowed PGOOD (E-grade) | Monitors output voltage within ±2.75% window (102.75%–107.25% rise, 101.75%–106.25% fall), enabling precise fault detection in safety-critical ADAS supplies. |
| Spread-spectrum EMI reduction | Factory-enabled ±3% frequency dithering centered at fSW reduces peak radiated emissions by >10dB without compromising regulation stability. |
| 99% dropout operation | Maintains regulation with only 0.36V headroom at 8A (e.g., 12VIN → 12VOUT), eliminating need for pre-regulators in 12V battery systems. |
| Accurate EN UVLO | EN threshold of 0.9V (typ) with 100mV hysteresis ensures clean startup/shutdown during battery transients - critical for automotive microcontroller sequencing. |
Applications
| ADAS Camera Power Supply | Radar Processor Core Rail |
|---|---|
|
Use Scenario: Powers 3.3V/5V imaging sensor and ISP in forward-facing ADAS camera module operating in -40°C to +105°C under-hood environment. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise, and EMI-compliant power with PGOOD monitoring for system health reporting. Use Value: 10μA quiescent current meets ISO 16750-2 Class D sleep-mode requirements; 2.1MHz switching enables compact 1206-size magnetics and <10mm² total solution size. |
Use Scenario: Supplies 1.2V core voltage to 77GHz radar SoC requiring tight transient response and minimal voltage deviation during chirp bursts. IC Role / Device Role / Timing Role: High-efficiency, fast-transient buck converter with average current-mode control and 34ns min on-time for stable low-VIN operation. Use Value: ±1% output accuracy ensures radar ADC reference stability; dual-phase support enables scalable 12A+ designs without redesigning PCB layout. |
| Infotainment System PMIC Stage | Automotive Gateway MCU Supply |
|
Use Scenario: Generates 5V intermediate rail for USB-C PD, display backlight drivers, and audio codecs in central infotainment head unit. IC Role / Device Role / Timing Role: High-current, high-frequency buck stage delivering clean 5V from 12V battery with spread-spectrum EMI suppression. Use Value: 400kHz/2.1MHz selectability allows trade-off between efficiency (400kHz) and size (2.1MHz); SYNC input enables synchronization to system clock tree. |
Use Scenario: Provides 3.3V always-on supply to gateway MCU and CAN transceivers during vehicle sleep mode with strict current budget. IC Role / Device Role / Timing Role: Low-IQ buck converter with programmable EN threshold and windowed PGOOD for safe wake-up signaling. Use Value: 10μA skip-mode IQ and accurate 0.9V EN threshold ensure reliable wake-on-CAN while preventing false triggers from battery ripple. |
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 |
|---|---|---|---|
| MAX20410AFOC/VY+T | 10A rated (vs. 8A), higher ILIM threshold (14A vs. 12A), same pinout and feature set. | Better suited for future-proofing or margin-critical 8–10A loads (e.g., next-gen domain controllers). | Select MAX20410AFOC/VY+T if peak load exceeds 8A or if higher current-limit margin is required. |
| TPS62933RGER | 6A rated, 3V–18V input, 1.8V–5.5V output, 1.5MHz fixed freq, no dual-phase or spread-spectrum. | Targeted at non-automotive industrial or consumer applications with lower voltage/thermal stress. | Choose TPS62933RGER only for cost-sensitive, non-AEC-Q100, sub-6A applications where EMI and dual-phase are not required. |
Compared with MAX20410AFOC/VY+T, the MAX20408AFOC/VY+T offers identical functionality at 8A rating and lower current-limit threshold - ideal for optimized BOM cost where full 10A headroom is unnecessary. Versus TPS62933RGER, it delivers automotive qualification, wider input range, dual-phase scalability, and superior EMI performance - making it the only viable choice for AEC-Q100-compliant 8A designs.
Availability
MAX20408AFOC/VY+T is available at Aetrix Electronics and suitable for automotive ADAS camera modules, radar processor power rails, infotainment system intermediate supplies, and gateway MCU always-on rails requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX20408AFOC/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 signal chain solutions.
The MAX20408/MAX20410 family is designed specifically for demanding automotive power applications - delivering high-current, low-quiescent, AEC-Q100-qualified DC-DC conversion in ultra-small packages for ADAS, infotainment, and body electronics.
FAQ
What is the maximum input voltage transient the MAX20408AFOC/VY+T can withstand?
The MAX20408AFOC/VY+T supports 42V load-dump transients per ISO 16750-2, with absolute maximum ratings specifying SUP to PGND at -0.3V to +42V. Its internal high-side FET and protection circuitry are designed to survive these events without latch-up or degradation, provided external input clamping and bulk capacitance meet recommended guidelines in the datasheet.
Does the MAX20408AFOC/VY+T support fixed-output voltage configurations without external resistors?
Yes, the MAX20408AFOC/VY+T supports fixed-output operation: connect FB directly to BIAS and configure OUT to sense the output. The device then regulates to factory-trimmed voltages - 3.3V, 4V, or 5V - with ±1% accuracy over temperature and line, eliminating resistor-divider tolerance errors and saving board space.
How does the dual-phase configuration of MAX20408AFOC/VY+T achieve current sharing?
The MAX20408AFOC/VY+T achieves dynamic current sharing in dual-phase mode via its VEA (voltage error amplifier) pins: the controller's VEA drives the target's VEA, forcing identical error amplifier outputs and thus equal current distribution. Combined with 180° phase offset from SYNCOUT-to-SYNC routing, this ensures balanced thermal loading and reduced input/output ripple.
Is spread-spectrum enabled by default on the MAX20408AFOC/VY+T?
No - spread-spectrum is a factory-programmed option. The MAX20408AFOC/VY+T part number indicates the E-grade variant with windowed PGOOD and improved EN threshold accuracy, but spread-spectrum must be explicitly selected at order time (e.g., MAX20408AFOC/VY+T-SS). When enabled, it modulates fSW by ±3% with triangular profile to suppress narrowband EMI peaks.
What thermal performance can be expected from the MAX20408AFOC/VY+T in a 4-layer PCB design?
In a standard 4-layer JEDEC board, the MAX20408AFOC/VY+T exhibits θJA = 38.6°C/W and θJB = 16.3°C/W. With proper thermal vias under the exposed PGND pad and copper pour, junction temperature rise is typically <45°C at 8A/12VIN→5VOUT in FPWM mode - well within the +125°C ambient limit and supporting continuous operation in sealed enclosures.
MAX20408AFOC/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 (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+T FAQ
1.How can I place an order for MAX20408AFOC/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOC/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 MAX20408AFOC/VY+T reliable?
The price and inventory of MAX20408AFOC/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 MAX20408AFOC/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20408AFOC/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOC/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOC/VY+T?
MAX20408AFOC/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOC/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 MAX20408AFOC/VY+T?
For technical support, including MAX20408AFOC/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOC/VY+T requirements.
6.How does Aetrix verify that MAX20408AFOC/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOC/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 MAX20408AFOC/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20408AFOC/VY+T?
All MAX20408AFOC/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOC/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 MAX20408AFOC/VY+T part is unused and in its original packaging.
Return procedure for MAX20408AFOC/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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