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Analog Devices Inc./Maxim Integrated MAX42408AFOA+T
- Part No.:
- MAX42408AFOA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX42408AFOA+T.pdf
- Description:
- IC REG BUCK ADJ 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,535
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Product details
Overview
MAX42408AFOA+T from Analog Devices is a fully integrated 400kHz synchronous buck converter delivering up to 8A output current with 4.5V–36V input range, 0.8V–10V programmable output voltage, and 20μA quiescent current in skip mode-designed for industrial point-of-load regulation where high efficiency at light load and compact solution size are critical.
For engineers reviewing the MAX42408AFOA+T datasheet, MAX42408AFOA+T pinout, MAX42408AFOA+T application, or MAX42408AFOA+T equivalent, key selection criteria include its dual-phase capability (up to 20A with second IC), 36ns minimum on-time for wide VIN/VOUT ratios, symmetric SUP/PGND pinout for EMI control, and thermal shutdown at 175°C with 20°C hysteresis.
Technical Context
The MAX42408AFOA+T implements average current-mode control with internal high-side (26mΩ typ) and low-side (13mΩ typ) MOSFETs, enabling precise dynamic current sharing in dual-phase configurations. Its 400kHz fixed switching frequency supports small external inductors (e.g., 2.2µH) and reduces output ripple without requiring external compensation.
It features a dedicated VEA error amplifier output for inter-IC voltage loop sharing in dual-phase setups, 180° out-of-phase clock synchronization via SYNC/SYNCOUT, and a 2.5ms soft-start ramp-ensuring controlled startup and stable transient response across -40°C to +125°C operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial supply rails including 12V, 24V, and 36V systems without pre-regulation. |
| Max Output Current | 8A - sufficient for FPGA core rails, ASIC I/O supplies, and motor control logic power domains. |
| Switching Frequency | 400kHz - enables use of compact 2.2µH inductors and 220µF ceramic output capacitors while maintaining >95% peak efficiency at 12VIN/3.3VOUT. |
| Output Voltage Range | 0.8V to 10V - adjustable via external resistor divider; covers DDR memory, microcontroller cores, and analog subsystems. |
| Quiescent Current | 20μA in skip mode - extends battery life in always-on industrial sensors and remote I/O modules. |
| Min On-Time | 36ns - allows high step-down ratios (e.g., 36V→3.3V) without pulse-skipping instability. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
Package: 3.5mm × 3.75mm, 17-pin FC2QFN with exposed thermal pad; thermally enhanced for 27°C/W θJA on 4-layer evaluation board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage compatible (up to 42V) logic enable; pulls device into 4μA shutdown when low. |
| BST | Bootstrap supply | Drives high-side gate; requires 0.1µF ceramic capacitor between BST and LX for proper bootstrap charging. |
| SUP (pins 3,9) | IC and high-side FET supply | Dual pins internally connected; bypassed with 0.1µF + 4.7µF ceramics per side to minimize input ripple and EMI. |
| PGND (pins 4,5,7,8) | Power ground | Four dedicated low-impedance ground terminals; symmetric placement with SUP pins reduces ground loop area and improves EMI. |
| LX | Switch node | Connects to buck inductor; high-impedance when disabled; routing must be short and wide to limit dV/dt noise. |
| BIAS | 1.8V linear regulator output | Powers internal circuitry; requires ≥2.2µF ceramic capacitor to GND; switches sourcing from VIN to VOUT post-startup. |
| FB | Feedback input | Monitors output via resistor divider; 0.8V reference enables precise 0.8V–10V adjustment; 100nA leakage minimizes divider error. |
| OUT | Output voltage sense | Direct connection to output rail; used with PGOOD for accurate regulation monitoring independent of FB path. |
| VEA | Error amplifier output | Shared between controller/target in dual-phase; enables synchronized voltage loop without external op-amp. |
| PGOOD | Open-drain power-good indicator | Asserts low during soft-start or if VOUT drops below 93% of target; requires pull-up to BIAS or ≤5.5V rail. |
| SYNC | Mode control/sync input | Low = skip mode; high = forced PWM; external clock = sync mode - configures operation without external logic. |
| SYNCOUT | 180° out-of-phase clock output | Drives target IC's SYNC in dual-phase; tied to BIAS to configure target; disabled in single-phase. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase scalability | Two MAX42408AFOA+T ICs deliver up to 20A with dynamic current sharing and 180° phase shift-eliminates need for external current-sharing controllers. |
| Symmetric SUP/PGND layout | Opposite-side power pin placement minimizes magnetic field coupling and reduces conducted EMI by balancing high-current loop orientation. |
| 36ns minimum on-time | Enables stable 36V-to-3.3V conversion (10.9:1 ratio) at 400kHz without cycle skipping-critical for high-VIN industrial applications. |
| Integrated 1.8V BIAS regulator | Self-powered internal bias rail eliminates external LDO; 2.2µF capacitor ensures stability and low-noise reference for FB/VEA circuits. |
| Programmable soft-start | Fixed 2.5ms ramp time at 400kHz prevents input inrush current surges-reduces stress on upstream converters and input capacitors. |
Applications
| Industrial PLC I/O Power | Factory Automation Sensors |
|---|---|
Use Scenario: Powering isolated digital I/O modules in programmable logic controllers with 24V DC input and 3.3V/5V logic rails. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 8A peak current to multiple I/O banks with tight voltage tolerance. Use Value: 20μA skip-mode IQ extends uptime in battery-backed control modules; dual-phase option supports future expansion to 16-channel I/O. | Use Scenario: Supplying vision sensors and IO-Link masters in robotic arms where space, heat, and EMI are constrained. IC Role / Device Role / Timing Role: Compact 3.5mm × 3.75mm buck converter powering image sensor analog front-end and microcontroller core simultaneously. Use Value: Symmetric SUP/PGND pinout lowers radiated emissions below CISPR-25 Class 5 limits; 36ns min on-time ensures stable 24V→1.8V conversion. |
| DC Power Distribution Unit | Ruggedized Edge Computing Node |
Use Scenario: Distributed 12V/24V-to-5V/3.3V conversion in modular rack-mounted power distribution units for factory floor equipment. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter with PGOOD signaling for system-level power sequencing and fault reporting. Use Value: 95.6% peak efficiency at 12VIN/3.3VOUT reduces thermal load in densely packed enclosures; thermal shutdown protects against fan failure. | Use Scenario: Powering ARM-based edge AI accelerators in oilfield telemetry units exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Main SoC power supply with programmable 0.8V–10V output supporting dynamic voltage scaling for workload optimization. Use Value: -40°C to +125°C junction rating ensures reliability under extended thermal cycling; 4.5V–36V input accommodates degraded vehicle battery conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42410AFOA+T | 10A max output current, same 400kHz/0.8–10V spec - higher ILIM threshold (11.9–16A vs. 10–14A). | Required where peak load exceeds 8A but PCB footprint and pinout must remain identical. | Select when system peak current demand exceeds 8A and thermal margin is constrained; shares same layout and firmware. |
| MPQ4572GQB-A | 8A, 36V, 500kHz - no dual-phase support, no VEA pin, 25μA IQ, different pinout (20-pin QFN). | Suitable for single-rail, non-scalable designs where dual-phase coordination is unnecessary. | Choose for cost-sensitive, single-phase-only applications where board space allows re-layout and no inter-IC current sharing is needed. |
Compared with MAX42410AFOA+T, the MAX42408AFOA+T offers lower current rating but identical thermal and EMI performance in same footprint; versus MPQ4572GQB-A, it provides unique dual-phase orchestration and superior light-load efficiency at the cost of higher BOM complexity.
Availability
MAX42408AFOA+T is available at Aetrix Electronics and suitable for industrial automation, distributed DC power systems, and point-of-load regulation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX42408AFOA+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 industrial, automotive, communications, and healthcare markets since 1965.
The MAX42408/MAX42410 product line delivers highly integrated, thermally robust buck converters optimized for space-constrained industrial power systems demanding wide input range, ultra-low IQ, and scalable multi-phase operation.
FAQ
What is the maximum output current supported by the MAX42408AFOA+T?
The MAX42408AFOA+T supports up to 8A continuous output current at 400kHz switching frequency with proper thermal management. Its current-limit threshold is specified from 10A to 14A, and it maintains stable regulation across the full -40°C to +125°C junction temperature range. In dual-phase configuration with a second MAX42408AFOA+T, total output capacity scales to 16A.
Does the MAX42408AFOA+T support dual-phase operation, and how is it configured?
Yes, the MAX42408AFOA+T supports dual-phase operation to deliver up to 16A (two 8A ICs). Configuration requires one IC as controller (SYNC tied high) and the other as target (SYNCOUT connected to BIAS). The controller's SYNCOUT drives the target's SYNC at 180° phase offset, and VEA pins are connected to share the voltage error amplifier-no external current-sharing circuitry is needed.
What is the purpose of the VEA pin on the MAX42408AFOA+T?
The VEA pin on the MAX42408AFOA+T is the internal voltage-loop error amplifier output. In dual-phase operation, connecting the VEA pins of controller and target ICs ensures shared voltage regulation and balanced dynamic current sharing. In single-phase use, VEA is left unconnected. It eliminates the need for external op-amps or complex compensation networks when scaling power.
Can the MAX42408AFOA+T operate in dropout mode, and what does that mean for system design?
Yes, the MAX42408AFOA+T operates in dropout mode by achieving up to 96% duty cycle, allowing regulation when input voltage approaches output voltage (e.g., 5.5V VIN → 5V VOUT). This capability simplifies system architecture by eliminating pre-regulators in industrial 5V/12V rail systems and improves efficiency in brownout conditions without compromising regulation integrity.
What are the key PCB layout requirements for optimal EMI performance with the MAX42408AFOA+T?
Optimal EMI performance requires symmetric placement of four PGND pins opposite two SUP pins to cancel magnetic fields, short/wide LX traces to minimize loop area, 0.1µF ceramic capacitors placed directly at each SUP–PGND pair, and separation of FB/VEA analog traces from noisy LX/BST nodes. A solid ground plane beneath power components and star-point connection between GND and PGND further suppresses common-mode noise.
MAX42408AFOA+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
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 8A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX42408AFOA+T FAQ
1.How can I place an order for MAX42408AFOA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42408AFOA+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 MAX42408AFOA+T reliable?
The price and inventory of MAX42408AFOA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42408AFOA+T is usually 5 days.
3.What payment methods are accepted for MAX42408AFOA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42408AFOA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42408AFOA+T?
MAX42408AFOA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42408AFOA+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 MAX42408AFOA+T?
For technical support, including MAX42408AFOA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42408AFOA+T requirements.
6.How does Aetrix verify that MAX42408AFOA+T is sourced from the original manufacturer or authorized distributors?
All MAX42408AFOA+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 MAX42408AFOA+T meets industry standards.
7.What is the process for return or replacement of MAX42408AFOA+T?
All MAX42408AFOA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX42408AFOA+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 MAX42408AFOA+T part is unused and in its original packaging.
Return procedure for MAX42408AFOA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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