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Analog Devices Inc./Maxim Integrated MAX20408AFOG/VY+
- Part No.:
- MAX20408AFOG/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOG/VY+.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:276
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Product details
Overview
MAX20408AFOG/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 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, ±1% output voltage accuracy (E-version), and AEC-Q100 qualification for use in ADAS power rails and infotainment systems.
For engineers reviewing the MAX20408AFOG/VY+ datasheet, MAX20408AFOG/VY+ pinout, MAX20408AFOG/VY+ application, or MAX20408AFOG/VY+ equivalent, this page delivers verified package mapping (17-pin FC2QFN), dual-phase capability up to 20A, PGOOD windowing, EN threshold accuracy, and thermal shutdown at 175°C - all confirmed for the exact MAX20408AFOG/VY+ variant.
Technical Context
The MAX20408AFOG/VY+ implements average current-mode control with 34ns minimum on-time, enabling stable operation across wide VIN/VOUT ratios (e.g., 24V→3.3V) without pulse-skipping artifacts. Its dual-phase architecture supports dynamic current sharing and 180° out-of-phase operation between controller and target ICs, reducing input/output ripple and improving transient response under step-load conditions.
It integrates a 1.8V BIAS linear regulator with 2.2μF output capacitance requirement, symmetrical SUP/PGND pin placement for balanced current loops, and spread-spectrum modulation (±3% around fSW) to suppress EMI peaks - all factory-configured for this specific part number per Analog Devices' Rev 14 datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports cold-crank (4.5V) and load-dump (42V tolerant) conditions in automotive systems. |
| Max Output Current | 8A - continuous DC output capability with thermal derating per θJA = 38.6°C/W on JEDEC board. |
| Quiescent Current | 10μA in skip mode - enables always-on subsystems (e.g., CAN wake-up receivers) with ultra-low standby power. |
| Switching Frequency | 2.1MHz or 400kHz - selectable via pin strap or SYNC; 2.1MHz enables <1mm height inductors and avoids AM band interference. |
| Output Voltage Accuracy | ±1% (MAX20408E version) - ensures precise rail regulation for sensitive processors and sensors in ADAS ECUs. |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + dropout (e.g., 5.2V → 5V at 8A), critical for automotive battery droop. |
| PGOOD Window | 102.75%–107.25% (rising), 101.75%–106.25% (falling) - tight windowed monitoring prevents false resets during transients. |
| Operating Temp | −40°C to +125°C ambient - qualified per AEC-Q100 Grade 1, junction-rated to +150°C for sustained operation. |
Pinout & Package
MAX20408AFOG/VY+ uses a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package (package code F173A3FY+4) 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 (up to 42V); 0.9V typical threshold enables direct connection to automotive battery or MCU GPIO. |
| 2, BST | Bootstrap Supply | Connects 0.1μF ceramic capacitor to LX; powers high-side gate driver for efficient 100mΩ RDSON_HS operation. |
| 3, 9, SUP | IC & High-Side Supply Input | Dual pins internally connected; bypassed with 0.1μF + 4.7μF ceramics for low-impedance input filtering and transient immunity. |
| 4, 5, 7, PGND | Power Ground | Four dedicated PGND pins reduce ground bounce and improve current sharing in dual-phase configurations. |
| 6, LX | Switch Node | Connects to buck inductor; 34ns min on-time supports high step-down ratios while maintaining PWM stability. |
| 8, GND | Analog Ground | Separate from PGND; connects to PCB ground plane at single point to isolate noise-sensitive feedback paths. |
| 11, BIAS | 1.8V Linear Regulator Output | Powers internal circuitry; requires ≥2.2μF ceramic cap to GND for stability and low-noise biasing of error amplifier. |
| 12, FB | Feedback Input | Accepts resistor divider for 0.8V–10V adjustable output or ties to BIAS for fixed 3.3V/4V/5V options. |
| 13, OUT | Output Sense Input | Used only when FB tied to BIAS; enables accurate remote sensing of regulated output voltage. |
| 14, VEA | Error Amplifier Output | Connected between controller/target in dual-phase mode to enable dynamic current sharing and phase balancing. |
| 15, PGOOD | Open-Drain Power-Good | Windowed indicator (102.75–107.25%) asserts low during soft-start or fault; requires external pull-up to BIAS or VOUT. |
| 16, SYNC | Synchronization Input | Configures FPWM (high), skip mode (low), or external clock sync (AC signal); disables internal spread-spectrum when driven. |
| 17, SYNCOUT | 180° Out-of-Phase Clock Output | Drives SYNC of target IC in dual-phase setup; left open in single-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase scalability | Two MAX20408AFOG/VY+ ICs support 20A total output with 180° phase shift, dynamic current sharing, and reduced input capacitor RMS current. |
| Ultra-low IQ operation | 10μA quiescent current in skip mode enables >10-year battery life in always-on automotive modules without compromising startup time. |
| Automotive robustness | 42V load-dump tolerance, -40°C to +125°C operation, AEC-Q100 Grade 1 qualification, and hiccup-mode short-circuit protection ensure field reliability. |
| EMI-optimized layout | Symmetric SUP/PGND pinout, integrated spread-spectrum (±3%), and 2.1MHz option minimize radiated emissions without external filters. |
| Accurate enable threshold | EN threshold of 0.9V (typ) with ±75mV hysteresis enables precise UVLO programming for battery monitoring and system sequencing. |
| Windowed PGOOD | Asymmetric rising/falling thresholds (102.75%/101.75%) prevent chatter during line/load transients while ensuring valid power status reporting. |
Applications
| ADAS Camera Power Supply | Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers image sensor and ISP in forward-facing ADAS camera module operating from 12V battery with cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator providing clean, low-noise, and tightly regulated power with PGOOD monitoring for sensor initialization. Use Value: 94.3% efficiency at 12VIN/5VOUT/2.1MHz reduces thermal stress in sealed camera housing; 34ns min on-time sustains regulation during 4.5V cold-crank. |
Use Scenario: Supplies core voltage (e.g., 1.1V @ 6A) to application processor in head-unit infotainment system with dynamic DVFS scaling. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.1V via external resistor divider, synchronized to system clock via SYNC input. Use Value: 400kHz switching enables high-efficiency operation at medium loads; dual-phase capability allows future upgrade to 12A without PCB redesign. |
| Automotive Telematics ECU | Body Control Module (BCM) Subsystem |
|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in telematics control unit requiring always-on connectivity and low standby power. IC Role / Device Role / Timing Role: Always-on 3.3V supply with 10μA skip-mode IQ and windowed PGOOD for wake-up event validation. Use Value: 10μA quiescent current extends vehicle battery life during extended parking; AEC-Q100 qualification ensures 15-year field reliability. |
Use Scenario: Generates 5V rail for microcontroller, LIN transceivers, and LED drivers in body control module exposed to harsh under-hood temperatures. IC Role / Device Role / Timing Role: Fixed 5V output buck converter with thermal shutdown at 175°C and 99% dropout capability for brownout resilience. Use Value: −40°C to +125°C ambient rating and 42V load-dump tolerance eliminate need for external TVS; FC2QFN package enables compact, high-power-density layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20408AFOG/V+ (same package, non-E version) | ±1.5% output accuracy, standard PGOOD (92–96%), less accurate EN threshold (1.2V vs. 0.9V) | Suitable for non-safety-critical 5V supplies where tighter regulation is not required | Select MAX20408AFOG/VY+ when windowed PGOOD, ±1% accuracy, or precise EN UVLO is needed for ADAS or telematics. |
| MAX20410AFOG/VY+ | 10A rated output, higher ILIM (14A vs. 12A), same pinout and feature set | Required for >8A peak loads (e.g., radar SoCs) but draws more PCB area and thermal budget | Choose MAX20408AFOG/VY+ for cost-optimized 8A designs; upgrade to MAX20410AFOG/VY+ only if full 10A capability is validated. |
Compared with MAX20408AFOG/V+ and MAX20410AFOG/VY+, the MAX20408AFOG/VY+ delivers optimal balance of precision (±1% VOUT), low-IQ operation (10μA), and automotive-grade monitoring (windowed PGOOD), making it the preferred choice for ADAS camera and telematics power rails where regulation accuracy and fault detection integrity are critical.
Availability
MAX20408AFOG/VY+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power supplies, and telematics ECUs requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX20408AFOG/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 precision power, sensing, and signal chain solutions.
The MAX20408/MAX20410 family is designed specifically for automotive power conversion - delivering high-current, low-quiescent, AEC-Q100-qualified buck regulators that meet stringent EMI, thermal, and reliability requirements of modern ADAS and infotainment systems.
FAQ
What is the maximum output current supported by MAX20408AFOG/VY+?
The MAX20408AFOG/VY+ delivers up to 8A continuous DC output current under recommended operating conditions (TA ≤ +125°C, θJA = 38.6°C/W). Its 12A current-limit threshold and thermal shutdown at 175°C provide robust overload protection. Derating applies above +70°C ambient per 37mW/°C, and actual achievable current depends on PCB layout, airflow, and input/output voltage differential.
Does MAX20408AFOG/VY+ support dual-phase operation?
Yes, MAX20408AFOG/VY+ supports dual-phase configuration with another identical IC to deliver up to 20A total output. The controller/target pairing uses VEA pin interconnection and SYNCOUT-to-SYNC routing to achieve 180° phase shift and dynamic current sharing. This capability is fully documented in the MAX20408/MAX20410 datasheet Rev 14 and requires no additional components beyond standard external passives.
What is the purpose of the windowed PGOOD feature in MAX20408AFOG/VY+?
The windowed PGOOD in MAX20408AFOG/VY+ provides asymmetric rising (102.75–107.25%) and falling (101.75–106.25%) thresholds to prevent false toggling during output transients while ensuring reliable power-good assertion. Unlike standard PGOOD, this windowed behavior eliminates chatter during line/load steps and guarantees valid status reporting for safety-critical ADAS subsystems - a key differentiator of the MAX20408E variant.
Can MAX20408AFOG/VY+ operate with a 2.1MHz switching frequency?
Yes, MAX20408AFOG/VY+ supports a fixed 2.1MHz switching frequency option, enabling compact designs with sub-1mm height inductors and minimal output capacitance. This mode is selected via internal configuration and is fully characterized for efficiency (up to 94.3% at 12VIN/5VOUT), EMI performance, and stability - including spread-spectrum modulation (±3%) when enabled.
Is MAX20408AFOG/VY+ AEC-Q100 qualified?
Yes, MAX20408AFOG/VY+ is AEC-Q100 qualified per Grade 1 (−40°C to +125°C ambient), with full characterization across temperature, voltage, and lifetime stress tests. Its qualification includes thermal cycling, humidity testing, and failure analysis - confirming suitability for automotive power rails in ADAS, infotainment, and telematics applications per Analog Devices' official datasheet Rev 14.
MAX20408AFOG/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 (3.3V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 8A
- Frequency - Switching:
- 400kHz
- 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)
MAX20408AFOG/VY+ FAQ
1.How can I place an order for MAX20408AFOG/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOG/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 MAX20408AFOG/VY+ reliable?
The price and inventory of MAX20408AFOG/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOG/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOG/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOG/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOG/VY+?
MAX20408AFOG/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOG/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 MAX20408AFOG/VY+?
For technical support, including MAX20408AFOG/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOG/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOG/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOG/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 MAX20408AFOG/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOG/VY+?
All MAX20408AFOG/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOG/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 MAX20408AFOG/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOG/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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