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Analog Devices Inc./Maxim Integrated MAX20408AFOF/VY+T
- Part No.:
- MAX20408AFOF/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOF/VY+T.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,198
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Product details
Overview
MAX20408AFOF/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-version), and AEC-Q100 qualification for use in ADAS power rails.
For engineers reviewing the MAX20408AFOF/VY+T datasheet, MAX20408AFOF/VY+T pinout, MAX20408AFOF/VY+T application, or MAX20408AFOF/VY+T 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 MAX20408AFOF/VY+T variant.
Technical Context
The MAX20408AFOF/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) without pulse-skipping instability. Its dual-phase architecture supports dynamic current sharing and 180° out-of-phase operation between controller and target ICs via SYNC/SYNCOUT signaling.
It integrates a 1.8V BIAS linear regulator with 2.2μF output capacitance requirement, symmetrical SUP/PGND pin placement for EMI reduction, and programmable EN threshold (0.825V–0.975V) optimized for automotive battery monitoring. The device operates in forced-PWM, skip, or externally synchronized modes - with spread-spectrum enabled only in free-running mode.
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 per ISO 7637-2. |
| Max Output Current | 8A - validated continuous output under +125°C ambient with 4-layer EV kit layout (θJA = 27°C/W). |
| Quiescent Current | 10μA in skip mode - enables always-on systems (e.g., telematics) with <100μW standby power loss at 12VIN. |
| Switching Frequency | 2.1MHz or 400kHz - fixed options; 2.1MHz enables <1μH inductors and avoids AM band interference. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - applies to fixed 3.3V/4V/5V and adjustable 0.8V–10V outputs, improving regulation stability in safety-critical rails. |
| Duty Cycle Max | 99% - enables dropout operation down to VOUT + 0.3V (e.g., 5V out from 5.3V input), critical for post-buck LDO replacement. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload while allowing recovery without system reset. |
Pinout & Package
MAX20408AFOF/VY+T 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 (3V–36V); 0.825V–0.975V threshold (E-version) enables precise UVLO setting for battery monitoring. |
| 2, BST | Bootstrap Supply | Drives high-side gate; requires 0.1μF ceramic cap to LX - enables efficient 100% duty cycle operation. |
| 3, 9, SUP | Power Supply Input | Dual SUP pins internally connected; bypassed with 0.1μF + 4.7μF ceramics - reduces input ripple and EMI. |
| 4, 5, 7, PGND | Power Ground | Four dedicated PGND pins minimize ground bounce and improve current sensing accuracy in high-di/dt paths. |
| 6, LX | Switch Node | Connects to buck inductor; high-impedance when disabled - prevents shoot-through during startup/shutdown. |
| 10, GND | Analog Ground | Separate from PGND; connects to PCB ground plane at single point - isolates noise-sensitive feedback path. |
| 11, BIAS | 1.8V Linear Regulator Output | Powers internal circuitry; requires ≥2.2μF ceramic cap to GND - ensures stable bias during transients. |
| 12, FB | Feedback Input | Connects to resistor divider (0.8V–10V range) or to BIAS for fixed output - sets regulation point with ±1% accuracy. |
| 13, OUT | Output Sense Input | Used only when FB tied to BIAS; senses actual output voltage - enables accurate remote sensing in noisy environments. |
| 14, VEA | Error Amplifier Output | Connected between controller/target in dual-phase mode - enables dynamic current sharing and phase balancing. |
| 15, PGOOD | Open-Drain Power-Good | Windowed (102.75%–107.25% rising / 101.75%–106.25% falling) - detects overvoltage and undervoltage faults simultaneously. |
| 16, SYNC | Synchronization Input | Configures FPWM (high), skip (low), or external sync (clock signal) - eliminates beat frequencies in multi-rail systems. |
| 17, SYNCOUT | 180° Out-of-Phase Clock Output | Drives SYNC of target IC in dual-phase setup - ensures interleaved operation and reduced input/output ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 Grade-1 | Qualified from −40°C to +125°C ambient - meets reliability requirements for engine bay and ADAS ECU placement. |
| Dual-Phase Scalability | Two MAX20408AFOF/VY+T ICs support 20A total with 180° interleaving and dynamic current sharing - eliminates need for larger single-phase solutions. |
| Windowed PGOOD | Monitors both overvoltage and undervoltage simultaneously (101.75%–107.25% window) - replaces discrete supervisor ICs in functional safety designs. |
| Low-IQ Skip Mode | 10μA IQ with automatic transition to FPWM above ~10mA load - maintains efficiency across full load range without external control logic. |
| Thermally Optimized FC2QFN | θJCb = 7.7°C/W (4-layer EV kit) - enables 8A operation without heatsink in compact automotive modules. |
| Robust Protection Suite | Includes cycle-by-cycle current limit, hiccup-mode short-circuit protection, thermal shutdown (175°C), and 42V load-dump tolerance - reduces external protection components. |
Applications
| ADAS Camera Power Supply | Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers 3.3V/5V rails for 8MP automotive camera modules with real-time image processing. IC Role / Device Role / Timing Role: Primary buck regulator delivering 5V@3A with <10mVpp ripple and fast transient response to sensor burst loads. Use Value: 2.1MHz switching enables <1μH inductor and <22μF total output capacitance, reducing board area by 40% vs. 400kHz solution. |
Use Scenario: Supplies core voltage (0.8V–1.2V) to infotainment application processors requiring dynamic voltage scaling. IC Role / Device Role / Timing Role: Adjustable-output buck converter with EN-controlled sequencing and PGOOD-monitored power-up. Use Value: ±1% output accuracy and 2.5ms soft-start ensure reliable boot without processor brownout or reset assertion. |
| Telematics LTE Modem Rail | Automotive Gateway Microcontroller Supply |
|
Use Scenario: Provides always-on 3.3V supply to LTE modem in parked vehicle mode with ultra-low leakage. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter operating in skip mode during deep sleep (<10μA IQ). Use Value: 10μA IQ extends battery life beyond ISO 16750-2 parked vehicle requirements (≤100μA total system drain). |
Use Scenario: Generates 5V rail for automotive gateway MCUs handling CAN FD, Ethernet, and LIN communication. IC Role / Device Role / Timing Role: Dual-phase configured MAX20408AFOF/VY+T pair delivering 10A with interleaved ripple cancellation. Use Value: 180° phase shift reduces input capacitor RMS current by 30%, enabling smaller 1210-case MLCCs instead of bulk electrolytics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20408AFOF/VY+ | Same pinout and electrical specs, but non-E version lacks windowed PGOOD and EN threshold accuracy. | Not suitable for ASIL-B/C systems requiring overvoltage detection or precise enable sequencing. | Select MAX20408AFOF/VY+T only when windowed PGOOD and ±50mV EN threshold accuracy are required. |
| TPS628641RGER | 6A, 2.5V–5.5V input, 1.8V–5.5V output; no dual-phase support; 1.8MHz switching; 25μA IQ. | Limited to low-voltage domains (e.g., USB-C PD sink rails); not qualified for automotive temperature range. | Use only for non-automotive, low-input-voltage applications where AEC-Q100 and 36V operation are unnecessary. |
Compared with MAX20408AFOF/VY+, the MAX20408AFOF/VY+ offers identical footprint and basic functionality but omits safety-critical windowed PGOOD and tight EN threshold - making it unsuitable for ASIL-compliant designs. The TPS628641RGER provides higher switching frequency but lacks automotive qualification, dual-phase scalability, and 36V input capability.
Availability
MAX20408AFOF/VY+T is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC supplies, and telematics modem rails requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX20408AFOF/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, and communications markets with precision power, sensing, and interface solutions.
The MAX20408/MAX20410 family targets automotive power conversion with integrated high-efficiency buck regulation, dual-phase scalability, and robust protection - designed specifically for ADAS, infotainment, and gateway ECUs operating in harsh environments.
FAQ
What is the maximum input voltage rating for MAX20408AFOF/VY+T, and does it support automotive load dump?
MAX20408AFOF/VY+T has an absolute maximum SUP-to-PGND rating of +42V, explicitly supporting ISO 7637-2 Load Dump Pulse 5a (up to 42V for 400ms). This allows direct connection to automotive battery rails without external TVS clamping in most cases. The device remains functional during the event and resumes regulation after transient decay. MAX20408AFOF/VY+T also includes internal overtemperature and short-circuit protection to maintain system integrity during fault conditions.
Does MAX20408AFOF/VY+T support dual-phase operation, and what is required to configure it?
Yes, MAX20408AFOF/VY+T supports dual-phase operation up to 20A total output. To configure, one IC is designated as controller (SYNCOUT left open, SYNC driven high/low/external clock), and the second as target (SYNC connected to first IC's SYNCOUT, SYNCOUT tied to BIAS). VEA pins must be connected together, and both ICs require matched output capacitors and inductors. Dynamic current sharing is achieved through average current-mode control without external current-sense resistors.
What is the purpose of the windowed PGOOD feature in MAX20408AFOF/VY+T, and how does it differ from standard PGOOD?
The windowed PGOOD in MAX20408AFOF/VY+T monitors both overvoltage and undervoltage simultaneously - asserting low when output falls below 101.75% or rises above 107.25% of nominal (e.g., 5V ±5%). Standard PGOOD only detects undervoltage (typically 90–95% threshold). This dual-threshold behavior enables single-rail fault detection for functional safety applications (e.g., ASIL-B), eliminating need for separate OVP circuitry and simplifying system-level diagnostics.
Can MAX20408AFOF/VY+T operate with a 2.1MHz switching frequency, and what design benefits does that provide?
Yes, MAX20408AFOF/VY+T supports fixed 2.1MHz switching frequency. This enables use of sub-1μH inductors and <22μF total ceramic output capacitance, significantly reducing solution size and weight. It also places switching harmonics above the AM radio band (530–1710kHz), eliminating filtering requirements. Efficiency remains high - up to 94.3% at 12VIN/5VOUT - due to optimized gate drive and low RDS(ON) (25mΩ HS / 12mΩ LS).
What is the quiescent current of MAX20408AFOF/VY+T in skip mode, and how does it compare to forced-PWM mode?
MAX20408AFOF/VY+T draws 10μA quiescent current in skip mode at no load, enabling ultra-low-power always-on operation in telematics and security systems. In forced-PWM mode, IQ increases to ~100μA due to continuous gate drive activity. The device automatically transitions between modes based on load - maintaining >85% efficiency down to 1mA load in skip mode, while forced-PWM ensures constant frequency and low noise for noise-sensitive analog circuits.
MAX20408AFOF/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):
- 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)
MAX20408AFOF/VY+T FAQ
1.How can I place an order for MAX20408AFOF/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOF/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 MAX20408AFOF/VY+T reliable?
The price and inventory of MAX20408AFOF/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 MAX20408AFOF/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20408AFOF/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOF/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOF/VY+T?
MAX20408AFOF/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOF/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 MAX20408AFOF/VY+T?
For technical support, including MAX20408AFOF/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOF/VY+T requirements.
6.How does Aetrix verify that MAX20408AFOF/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOF/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 MAX20408AFOF/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20408AFOF/VY+T?
All MAX20408AFOF/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOF/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 MAX20408AFOF/VY+T part is unused and in its original packaging.
Return procedure for MAX20408AFOF/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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