My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20408AFOB/VY+
- Part No.:
- MAX20408AFOB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOB/VY+.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,986
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX20408AFOB/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-used in ADAS power rails and infotainment domain controllers.
For engineers reviewing the MAX20408AFOB/VY+ datasheet, MAX20408AFOB/VY+ pinout, MAX20408AFOB/VY+ application, or MAX20408AFOB/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 in space-constrained automotive modules.
Technical Context
The MAX20408AFOB/VY+ implements average current-mode control with 34ns minimum on-time, enabling high step-down ratios (e.g., 24V→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.
It integrates high-side (25mΩ typ) and low-side (12mΩ typ) MOSFETs, a 1.8V BIAS LDO, and programmable EN threshold (0.825–0.975V rising) for precise UVLO. The spread-spectrum option (±3% frequency modulation) reduces EMI emissions without external components.
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 - sustained continuous output with thermal derating; enables single-chip supply for radar SoCs or display drivers. |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on vehicle modules (e.g., telematics wake-up circuits). |
| Switching Frequency | 2.1MHz or 400kHz - 2.1MHz allows <1μH inductors and <10μF ceramic output caps; 400kHz optimizes efficiency at mid-load. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures stable core voltage for automotive microcontrollers without post-regulation. |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + 0.3V, critical for 12V→5V or 24V→3.3V automotive rails. |
| PGOOD Window | 102.75% to 107.25% (rising), 101.75% to 106.25% (falling) - windowed detection prevents false resets during transient load steps. |
Pinout & Package
MAX20408AFOB/VY+ uses a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with symmetric SUP/PGND pin placement to minimize high-current loop area and improve EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, EN | Enable Input | High-voltage compatible (up to 42V); 0.825–0.975V rising threshold enables precise system-level UVLO sequencing. |
| 2, BST | Bootstrap Supply | Connects 0.1μF ceramic capacitor to LX; sustains high-side gate drive during 100% duty cycle operation. |
| 3, 9, SUP | IC Supply Input | Dual SUP pins internally connected; bypassed with 0.1μF + 4.7μF ceramics to PGND for low-impedance input filtering. |
| 4, 5, 7, PGND | Power Ground | Four dedicated PGND pins reduce ground bounce and improve thermal conduction to PCB copper pour. |
| 6, LX | Switch Node | Direct connection to buck inductor; high dv/dt node requiring tight layout and guard ring to minimize EMI. |
| 10, GND | Analog Ground | Separate from PGND; connects to PCB ground plane at single-point star to isolate noise-sensitive feedback paths. |
| 11, BIAS | LDO Output | 1.8V internal regulator; powers internal circuitry and supplies FB reference; requires ≥2.2μF ceramic to GND. |
| 12, FB | Feedback Input | Accepts resistor divider (0.8V–10V adjustable) or direct tie to BIAS for fixed-output configurations (3.3V/4V/5V). |
| 13, OUT | Output Sense | Used only when FB tied to BIAS; senses regulated output directly for improved line/load regulation accuracy. |
| 14, VEA | Error Amplifier Output | Connected between controller/target in dual-phase mode to enable active current sharing; open in single-phase. |
| 15, PGOOD | Open-Drain Power-Good | Windowed indicator (102.75–107.25%) asserts high-Z when in spec; pulls low during soft-start or fault. |
| 16, SYNC | Synchronization Input | Configures FPWM (high), skip mode (low), or external clock sync (AC signal); disables spread-spectrum when driven externally. |
| 17, SYNCOUT | 180° Out-of-Phase Clock | Drives SYNC of target IC in dual-phase; tied to BIAS to configure as target; left open in single-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase scalability | Two MAX20408AFOB/VY+ ICs support 20A total with dynamic current sharing and 180° phase shift-reducing input/output ripple by >70% vs. single-phase. |
| Ultra-low IQ in skip mode | 10μA quiescent current enables compliance with automotive "parking mode" current budgets (<100μA system-wide) without external disable circuitry. |
| Automotive robustness | AEC-Q100 Grade 1 (−40°C to +125°C), 42V load-dump tolerance, and thermal shutdown (175°C) ensure reliability in under-hood environments. |
| EMI-optimized layout | Symmetric SUP/PGND pinout and integrated spread-spectrum (±3%) reduce peak radiated emissions by 10dB without added filters or shielding. |
| Accurate power-good monitoring | Windowed PGOOD (102.75–107.25%) eliminates false triggers during fast load transients-critical for safety-critical ADAS domain controllers. |
Applications
| ADAS Camera Module Power | Infotainment SoC Core Rail |
|---|---|
Use Scenario: Powering 5MP image sensor and ISP in forward-facing ADAS camera with strict EMI limits and cold-crank operation. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator with PGOOD monitoring and dual-phase expansion for future resolution upgrades. Use Value: 2.1MHz operation enables <1.5mm² solution size; 99% duty cycle maintains regulation during 6V cold-crank; windowed PGOOD prevents false camera reset. |
Use Scenario: Supplying 1.1V core voltage to ARM-based infotainment SoC with dynamic DVFS and low-noise requirements. IC Role / Device Role / Timing Role: Adjustable-output buck converter with 400kHz mode for peak efficiency and spread-spectrum for AM-band EMI suppression. Use Value: ±1% output accuracy ensures SoC timing margin; 10μA IQ extends battery backup time; dual-phase ready for next-gen higher-power SoCs. |
| Radar Transceiver Bias Supply | Body Control Module (BCM) Subsystem |
Use Scenario: Generating stable 5V rail for 77GHz radar transceiver MMICs in compact front-bumper module. IC Role / Device Role / Timing Role: High-efficiency, small-footprint buck with thermal-aware layout and 42V load-dump protection. Use Value: FC2QFN package achieves 7.7°C/W θJCb for reliable 8A operation in sealed enclosure; 34ns min on-time supports 24V→5V conversion without skipping. |
Use Scenario: Consolidating multiple 12V→5V/3.3V rails in centralized BCM with CAN FD interface and always-on wake logic. IC Role / Device Role / Timing Role: Primary buck converter with EN-controlled sequencing and PGOOD-driven system watchdog. Use Value: Programmable EN threshold enables precise brown-out detection; 10μA IQ meets ISO 16750-2 parking mode specs; AEC-Q100 ensures 15-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20408AFOB/V+ (same package, non-E) | ±1.5% output accuracy, standard PGOOD (92–96%), EN threshold 1.2V rising | Lower cost for non-safety-critical subsystems where tighter regulation not required | Select when windowed PGOOD and sub-1% accuracy are unnecessary; retains same pinout and layout. |
| TPS628641ARGT | 6A max, 2.5V–16V input, 1.8V BIAS, no dual-phase, no spread-spectrum | Better suited for non-automotive industrial or consumer applications with lower voltage inputs | Choose for cost-sensitive 12V systems without AEC-Q100 or 36V input requirement; smaller 2.5mm × 2.5mm QFN. |
Compared with MAX20408AFOB/VY+, the MAX20408AFOB/V+ offers identical footprint and thermal performance but relaxes accuracy and PGOOD windowing for cost reduction, while the TPS628641ARGT trades automotive robustness and scalability for smaller size and lower price in non-automotive designs.
Availability
MAX20408AFOB/VY+ is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and body electronics applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX20408AFOB/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 since 1965.
The MAX20408 family targets automotive power management with integrated high-current buck conversion, AEC-Q100 qualification, and features optimized for ADAS, infotainment, and domain controller subsystems.
FAQ
What is the maximum input voltage rating for MAX20408AFOB/VY+?
The MAX20408AFOB/VY+ has an absolute maximum SUP-to-PGND rating of +42V, supporting automotive load-dump transients per ISO 7637-2. Its recommended operating input range is 3.0V to 36V, enabling reliable operation across cold-crank (as low as 4.5V) and nominal 12V/24V systems. This rating is confirmed in the Absolute Maximum Ratings table on page 6 of the datasheet.
Does MAX20408AFOB/VY+ support dual-phase operation out of the box?
Yes, MAX20408AFOB/VY+ natively supports dual-phase configuration without external controllers. One IC operates as controller (SYNCOUT driving SYNC of second IC), the other as target (SYNCOUT tied to BIAS), enabling dynamic current sharing and 180° phase shift. Pin 14 (VEA) must be connected between devices, and both require identical feedback networks per the Typical Application Circuit on page 22.
What is the purpose of the windowed PGOOD feature in MAX20408AFOB/VY+?
The windowed PGOOD in MAX20408AFOB/VY+ provides asymmetric high/low thresholds (102.75–107.25% rising, 101.75–106.25% falling) to prevent false triggering during fast load transients. Unlike standard PGOOD, it remains high-Z only within this narrow band-ensuring system processors receive unambiguous power-status signals in safety-critical ADAS applications where spurious resets must be avoided.
Can MAX20408AFOB/VY+ operate with a 2.1MHz switching frequency and still achieve high efficiency?
Yes, MAX20408AFOB/VY+ achieves up to 94.3% efficiency at 12VIN/5VOUT with 2.1MHz operation (per Typical Operating Characteristics, Figure 10). Its low RDS(ON) high-side (25mΩ) and low-side (12mΩ) switches, combined with optimized gate drive and 34ns minimum on-time, maintain high efficiency even at high frequencies-enabling compact magnetics and reduced output capacitance without sacrificing thermal performance.
How does the EN pin threshold differ between MAX20408AFOB/VY+ and earlier MAX20408 variants?
MAX20408AFOB/VY+ (E-version) features an accurate EN rising threshold of 0.825–0.975V, enabling precise system-level undervoltage lockout sequencing. In contrast, non-E versions (e.g., MAX20408AFOB/V+) specify 1.2V typical EN high threshold. This tighter EN specification allows direct connection to low-voltage supervisor outputs and improves cold-crank detection resolution in automotive power trees.
MAX20408AFOB/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tube
- 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):
- 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)
MAX20408AFOB/VY+ FAQ
1.How can I place an order for MAX20408AFOB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOB/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 MAX20408AFOB/VY+ reliable?
The price and inventory of MAX20408AFOB/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOB/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOB/VY+?
MAX20408AFOB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOB/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 MAX20408AFOB/VY+?
For technical support, including MAX20408AFOB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOB/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOB/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 MAX20408AFOB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOB/VY+?
All MAX20408AFOB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOB/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 MAX20408AFOB/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20408AFOB/VY+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
