My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20408AFOA/VY+T
- Part No.:
- MAX20408AFOA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOA/VY+T.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,764
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX20408AFOA/VY+T from Analog Devices is an automotive-grade, fully integrated 36V synchronous buck converter delivering up to 8A output with internal high-side and low-side MOSFETs, 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for use in ADAS power rails.
For engineers reviewing the MAX20408AFOA/VY+T datasheet, MAX20408AFOA/VY+T pinout, MAX20408AFOA/VY+T application, or MAX20408AFOA/VY+T equivalent, key selection criteria include dropout operation at 99% duty cycle, ±1% output voltage accuracy (E-version), windowed PGOOD, dual-phase scalability to 20A, and FC2QFN thermal performance in automotive environments.
Technical Context
The MAX20408AFOA/VY+T implements average current-mode control with 34ns minimum on-time, enabling stable regulation across wide input/output voltage ratios (e.g., 24V→3.3V). It supports three SYNC-configurable operating modes: forced-PWM, skip mode, and external clock synchronization - with spread-spectrum EMI reduction enabled by factory option.
Dual-phase capability is implemented via VEA pin coupling and SYNCOUT-to-SYNC interconnection between controller and target ICs, enabling 180° out-of-phase operation and dynamic current sharing without external compensation. Thermal shutdown activates at 175°C with 20°C hysteresis, and short-circuit protection uses hiccup-mode recovery with 25ms off-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports cold-crank (3V) and load-dump (42V transient) conditions in automotive systems. |
| Max Output Current | 8A - sustained continuous output with thermal derating per θJA = 27°C/W on 4-layer EV kit. |
| Quiescent Current | 10μA in skip mode - enables always-on subsystems (e.g., CAN wake-up receivers) with minimal battery drain. |
| Switching Frequency | 2.1MHz or 400kHz - selects compact 0.47μH inductors (2.1MHz) or higher efficiency at medium loads (400kHz). |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures precise rail regulation for sensitive ADAS sensors and SoCs. |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 5V out from 5.05V input), critical for stop-start operation. |
| PGOOD Window | 102.75%–107.25% (rising), 101.75%–106.25% (falling) - provides tighter fault detection than standard 93%/94% thresholds. |
| Operating Temp | −40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications. |
Pinout & Package
The MAX20408AFOA/VY+T is housed in 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 |
|---|---|---|
| EN | Enable Input | High-voltage compatible (up to 42V); asserts device enable above 0.9V (typ), disables below 0.7V (typ) - supports direct battery connection. |
| BST | Bootstrap Supply | Connects 0.1μF ceramic capacitor to LX; powers high-side gate driver - enables efficient 100% duty-cycle operation. |
| SUP (Pins 3 & 9) | Main Power Input | Dual parallel pins reduce IR drop and thermal resistance; bypassed with 0.1μF + 4.7μF ceramics near IC - stabilizes gate drive and bias circuitry. |
| PGND (Pins 4, 5, 7, 8) | Power Ground | Four dedicated low-impedance ground terminals for high-current return paths - minimizes ground bounce and improves current-sense accuracy. |
| LX | Switch Node | Connects to buck inductor; handles peak currents up to 10A RMS - requires tight layout to suppress EMI and ringing. |
| BIAS | 1.8V Linear Regulator Output | Powers internal analog blocks; requires ≥2.2μF ceramic to GND - decouples noise-sensitive circuitry from main supply. |
| FB | Feedback Input | Accepts resistor divider for adjustable output (0.8V–10V) or ties to BIAS for fixed output - sets regulation point with ±1% accuracy (E-version). |
| OUT | Output Sense | Used only when FB connects to BIAS; senses regulated output directly - improves load regulation by compensating PCB trace IR drop. |
| VEA | Error Amplifier Output | Exposed for dual-phase current sharing; connected between controller and target ICs - enables matched dynamic response and balanced load division. |
| PGOOD | Open-Drain Status | Asserts high-Z when output is within window (102.75%–107.25%), low otherwise - signals system MCU of valid power rail with hysteresis. |
| SYNC | Mode Control Input | Low = skip mode, high = FPWM, external clock = sync - configures efficiency vs. noise trade-off without reprogramming. |
| SYNCOUT | 180° Clock Output | Drives target IC's SYNC in dual-phase setup; disabled in single-phase - eliminates need for external phase splitter. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Phase Scalability | Two MAX20408AFOA/VY+T ICs configure as controller/target to deliver 20A with 180° phase shift and dynamic current sharing - avoids discrete multiphase controller complexity. |
| Windowed PGOOD | Monitors output over ±2.75% window (rising/falling) - detects overvoltage faults missed by standard PGOOD, enhancing functional safety compliance. |
| Thermally Optimized FC2QFN | θJCb = 7.7°C/W (4-layer EV kit) - enables 8A operation at +85°C ambient without heatsink, reducing system size and cost. |
| Ultra-Low IQ Skip Mode | 10μA quiescent current with full regulation - extends battery life in always-on vehicle modules (e.g., telematics, alarm systems) during extended parking. |
| Automotive Transient Robustness | Withstands 42V load dump and operates down to 3V cold crank - eliminates need for upstream TVS or pre-regulator in 12V/24V architectures. |
| Spread-Spectrum EMI Reduction | ±3% frequency modulation centered at fSW - lowers peak radiated emissions by >10dB without adding filtering components or layout changes. |
Applications
| ADAS Camera Power Supply | Infotainment SoC Core Rail |
|---|---|
Use Scenario: Powers 3.3V/5V rails for CMOS image sensors and ISP processors in forward-facing camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing stable, low-noise power with PGOOD monitoring and thermal shutdown. Use Value: 99% duty cycle sustains regulation during 5.2V cold-crank; ±1% accuracy ensures sensor ADC reference stability; -40°C to +125°C operation meets ISO 16750-4. | Use Scenario: Supplies 1.1V/1.8V core and I/O rails for application processors in head-unit infotainment systems with display backlight and audio amplifiers. IC Role / Device Role / Timing Role: High-efficiency buck converter with 2.1MHz switching to minimize inductor size and avoid AM band interference. Use Value: 10μA skip-mode IQ preserves battery during sleep; dual-phase option scales to 20A for next-gen SoCs; spread-spectrum reduces EMI near FM radio antenna. |
| Automotive Gateway ECU | Electric Power Steering (EPS) Auxiliary Rail |
Use Scenario: Generates isolated 5V/3.3V rails for CAN FD transceivers, Ethernet PHYs, and microcontroller peripherals in zonal gateway ECUs. IC Role / Device Role / Timing Role: System power manager with EN-controlled sequencing and PGOOD status reporting to host MCU. Use Value: AEC-Q100 Grade 1 qualification ensures reliability; SYNC input allows synchronization to master clock for deterministic EMI; 400kHz option maximizes efficiency at 50–100% load. | Use Scenario: Provides clean 12V auxiliary power for EPS motor control logic, position sensors, and communication interfaces in harsh under-hood environments. IC Role / Device Role / Timing Role: Robust primary buck stage handling load dump transients and thermal cycling. Use Value: 42V transient tolerance eliminates external TVS; FC2QFN package withstands 150°C junction temperature; windowed PGOOD enables ASIL-B diagnostics per ISO 26262. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20408AFOA/VY+ | Same 17-pin FC2QFN package, identical pinout, but non-E version with ±1.5% VOUT accuracy and standard PGOOD (93%/94%) | Lower-cost option where tighter accuracy and windowed PGOOD are not required for functional safety | Select MAX20408AFOA/VY+ when budget constraints outweigh need for ASIL-compliant monitoring. |
| TPS628641RGER | 4A max output, 2.5V–16V input, 2.1MHz fixed freq, 15-pin QFN, no dual-phase support | Targeted at lower-power domains (e.g., body control modules), lacks automotive transients and AEC-Q100 rating | Choose TPS628641RGER only for non-safety-critical 12V systems with <4A load and no load-dump requirement. |
Compared with MAX20408AFOA/VY+, the MAX20408AFOA/VY+ offers identical footprint and functionality at reduced accuracy, while TPS628641RGER trades output capability, automotive robustness, and dual-phase scalability for smaller size and lower cost in less demanding applications.
Availability
MAX20408AFOA/VY+T is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC supplies, and electric power steering auxiliary rails requiring stable component supply across extended temperature and transient conditions.
Supply support for MAX20408AFOA/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.
The MAX20408/MAX20410 family delivers highly integrated, AEC-Q100-qualified buck converters optimized for space-constrained, thermally demanding automotive power systems - emphasizing low IQ, dual-phase scalability, and transient robustness.
FAQ
What is the maximum input voltage the MAX20408AFOA/VY+T can withstand during automotive load dump events?
The MAX20408AFOA/VY+T supports absolute maximum ratings up to +42V on the SUP pin, enabling direct connection to 12V/24V automotive batteries without external TVS diodes. This rating covers ISO 7637-2 Pulse 5a load dump transients, and the device remains functional after exposure when operated within recommended conditions. The internal high-side FET and protection circuitry are designed specifically for this stress condition, making MAX20408AFOA/VY+T suitable for front-end power conversion in engine bay applications.
Does the MAX20408AFOA/VY+T support dual-phase operation, and what is required to implement it?
Yes, the MAX20408AFOA/VY+T supports dual-phase operation to deliver up to 20A. Implementation requires two identical MAX20408AFOA/VY+T ICs: one configured as controller (SYNCOUT tied to BIAS), the other as target (SYNCOUT left open, SYNC driven by controller's SYNCOUT). VEA pins must be connected together, and inductors must be phased 180° apart. No external phase controller or current-sharing resistors are needed - dynamic current balancing is handled internally via average current-mode control.
What output voltage options are available for the MAX20408AFOA/VY+T, and how is accuracy affected?
The MAX20408AFOA/VY+T is the E-version, supporting fixed outputs of 3.3V, 4V, or 5V, or adjustable output from 0.8V to 10V using an external resistor divider on the FB pin. Its output voltage accuracy is ±1% over temperature and line/load, verified per Electrical Characteristics table. This improved accuracy over the non-E version (±1.5%) stems from tighter EN threshold and FB reference tolerances, making MAX20408AFOA/VY+T appropriate for precision rails in ADAS and infotainment systems.
How does the spread-spectrum feature work on the MAX20408AFOA/VY+T, and is it user-configurable?
The spread-spectrum feature on the MAX20408AFOA/VY+T is a factory-programmed option that modulates switching frequency by ±3% around the nominal value (2.1MHz or 400kHz) using a triangular waveform. It is not user-configurable via pins or registers - if ordered with spread-spectrum enabled, it operates automatically in all modes except when synchronized to an external clock. When externally synchronized, the device passes through the driving clock's modulation, allowing system-level EMI coordination.
What thermal performance can be expected from the MAX20408AFOA/VY+T in a typical 4-layer automotive PCB layout?
In a 4-layer evaluation kit layout, the MAX20408AFOA/VY+T achieves θJCb = 7.7°C/W and θJB = 9.9°C/W, enabling 8A continuous output at +85°C ambient without forced air. At 12VIN/5VOUT, efficiency reaches 94.3% (2.1MHz) or 95.6% (400kHz), limiting junction rise to ~55°C above ambient at full load. The FC2QFN package's bottom thermal pad and symmetric SUP/PGND pinout are optimized to maximize heat transfer to the PCB ground plane, meeting AEC-Q100 thermal lifetime requirements.
MAX20408AFOA/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)
MAX20408AFOA/VY+T FAQ
1.How can I place an order for MAX20408AFOA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOA/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 MAX20408AFOA/VY+T reliable?
The price and inventory of MAX20408AFOA/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 MAX20408AFOA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20408AFOA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOA/VY+T?
MAX20408AFOA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOA/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 MAX20408AFOA/VY+T?
For technical support, including MAX20408AFOA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOA/VY+T requirements.
6.How does Aetrix verify that MAX20408AFOA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOA/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 MAX20408AFOA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20408AFOA/VY+T?
All MAX20408AFOA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOA/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 MAX20408AFOA/VY+T part is unused and in its original packaging.
Return procedure for MAX20408AFOA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20408AFOA/VY+T 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…
