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Analog Devices Inc./Maxim Integrated MAX42408AFOA+
- Part No.:
- MAX42408AFOA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX42408AFOA+.pdf
- Description:
- IC REG BUCK ADJ 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,966
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Product details
Overview
MAX42408AFOA+ from Analog Devices is a fully integrated 36V, 8A synchronous buck converter with internal high-side and low-side MOSFETs, 400kHz fixed switching frequency, adjustable 0.8V–10V output voltage, and 10μA quiescent current in skip mode. It delivers high efficiency (up to 95.6% at 12VIN/3.3VOUT) and supports dropout operation for industrial point-of-load applications.
For engineers reviewing the MAX42408AFOA+ datasheet, MAX42408AFOA+ pinout, MAX42408AFOA+ application, or MAX42408AFOA+ equivalent, key selection considerations include its 400kHz/1.5MHz dual-frequency option, dual-phase scalability to 20A, PGOOD monitoring, thermal shutdown at 175°C, and FC2QFN-17 package with symmetric SUP/PGND layout for EMI control.
Technical Context
The MAX42408AFOA+ implements average current-mode control with 36ns minimum on-time, enabling stable regulation across wide input-output voltage ratios (e.g., 36VIN to 0.8VOUT). Its internal 1.8V BIAS regulator powers analog circuitry and switches sourcing from input to output post-startup when VOUT > 2.5V.
Dual-phase configuration uses one IC as controller (SYNC high → SYNCOUT active) and another as target (SYNCOUT tied to BIAS), achieving 180° out-of-phase switching and dynamic current sharing via shared VEA node. Soft-start time is fixed at 2.5ms for 400kHz operation, and hiccup-mode short-circuit protection activates after sustained overcurrent detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial supply rails including 24V DC systems and automotive cold-crank scenarios. |
| Max Output Current | 8A - continuous RMS current capability verified per JEDEC thermal testing; enables single-chip 3.3V/5V PoL for FPGAs or ASICs. |
| Switching Frequency | 400kHz - fixed internal oscillator option enabling compact 2.2µH inductor and 220µF output capacitance per typical design. |
| Quiescent Current | 10μA in skip mode - sustains ultra-low power state during light/no-load conditions without compromising wake-up response. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; FB accuracy ±1.5% (0.788V–0.812V) ensures tight regulation at low voltages. |
| Thermal Protection | 175°C shutdown with 20°C hysteresis - prevents permanent damage during overload or poor heatsinking; recovers autonomously. |
| Package | 3.5mm × 3.75mm FC2QFN-17 - thermally enhanced with θJA = 27°C/W on 4-layer eval board; PGND/SUP symmetry reduces EMI loop area. |
Pinout & Package
MAX42408AFOA+ is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad. The pinout features symmetric SUP and PGND placements (pins 3, 4, 5, 7, 8, 9) to balance high-current loops and minimize EMI radiation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input | High-voltage compatible (up to 42V); drives IC from shutdown (4μA IQ) into operation; no external pull-up required. |
| BST (Pin 2) | Bootstrap supply | Supplies high-side gate driver; requires 0.1μF ceramic cap between BST and LX for proper bootstrap charging. |
| SUP (Pins 3, 9) | IC supply & high-side switch rail | Dual pins internally connected; bypassed with 0.1μF + 4.7μF ceramics each side to suppress input ripple and EMI. |
| PGND (Pins 4, 5, 7, 8) | Power ground return | Four dedicated pins reduce impedance in high-current return path; must be joined externally with low-inductance copper. |
| LX (Pin 6) | Switch node | Connects to buck inductor; high-impedance when disabled; critical for EMI layout-keep trace short and wide. |
| GND (Pin 10) | Analog ground reference | Separate from PGND; connects to PCB ground plane at single star point to avoid noise coupling into feedback path. |
| BIAS (Pin 11) | 1.8V linear regulator output | Powers internal analog blocks; requires ≥2.2μF ceramic cap to GND; used as sync reference in dual-phase target config. |
| FB (Pin 12) | Feedback input | Monitors output via resistor divider; 100nA leakage enables high-resistance dividers for low-power biasing. |
| OUT (Pin 13) | Output voltage sense | Direct connection to output rail; used with PGOOD comparator to monitor regulation quality independent of FB path. |
| VEA (Pin 14) | Error amplifier output | Shared between controller/target in dual-phase to enforce balanced current sharing; left open in single-phase. |
| PGOOD (Pin 15) | Open-drain power-good indicator | Asserts low during soft-start or if VOUT drops below 93% of setpoint; requires external pull-up to BIAS or ≤5.5V rail. |
| SYNC (Pin 16) | Mode control & sync input | Low = skip mode (10μA IQ); high = forced PWM (400kHz); external clock = synchronization source. |
| SYNCOUT (Pin 17) | 180° out-of-phase clock output | Active only when SYNC = high; connects to SYNC of target IC in dual-phase; tied to BIAS to configure target device. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase scalability | Two MAX42408AFOA+ ICs deliver up to 20A with 180° phase shift and dynamic current sharing-no external controller needed. |
| Ultra-low quiescent current | 10μA in skip mode enables always-on subsystems (e.g., industrial sensors) without battery drain or thermal penalty. |
| Dropout-capable operation | 96% max duty cycle allows regulation down to VOUT ≈ 0.96 × VIN, supporting 36V-to-34V conversion in brownout conditions. |
| EMI-optimized pinout | Symmetric SUP/PGND placement creates opposing magnetic fields in input loops, reducing radiated emissions by >6dB per layout guide. |
| Robust protection suite | Includes cycle-by-cycle current limit, hiccup-mode short-circuit recovery, thermal shutdown (175°C), and UVLO on SUP/BIAS rails. |
Applications
| Industrial PLC I/O Module | Factory Automation Sensor Hub |
|---|---|
|
Use Scenario: Powering isolated analog input channels, digital I/O drivers, and microcontroller cores within DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator delivering 8A peak to FPGA-based logic and ADC front-ends. Use Value: Dropout operation maintains regulation during 24V bus sag; PGOOD signals system health to host MCU; 400kHz switching avoids AM radio band interference. |
Use Scenario: Centralized power for multi-sensor nodes (temperature, pressure, vibration) in robotic arms and CNC controllers. IC Role / Device Role / Timing Role: High-efficiency 5V/3.3V supply with dual-phase option scaling to 20A for dense sensor arrays with simultaneous sampling. Use Value: 10μA skip-mode IQ extends uptime in battery-buffered backup systems; thermal shutdown prevents field failures under enclosure overheating. |
| Ruggedized Edge Computing Node | Distributed DC Power Architecture |
|
Use Scenario: Powering ARM-based edge AI processors and PCIe peripherals in transportation or energy infrastructure cabinets. IC Role / Device Role / Timing Role: Main 12V-to-3.3V buck stage feeding SoC core and memory rails; synchronized to system clock via SYNC pin. Use Value: 1.5MHz option available (MAX42408AFOB+) enables <1µH inductors for space-constrained designs; FC2QFN package withstands 50g vibration. |
Use Scenario: Secondary regulation stage in telecom or datacom systems where 48V intermediate bus is stepped down to 12V/5V/3.3V subrails. IC Role / Device Role / Timing Role: Distributed load-point converter placed near high-current loads (e.g., ASICs, GPUs) to minimize IR drop and noise. Use Value: Dual-phase configuration eliminates need for larger single-phase ICs; footprint compatibility with MAX42405/06 allows scalable BOM reuse. |
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 rated (vs. 8A), same 400kHz/0.8–10V spec, identical pinout and package | Higher current headroom for future-proofing or margin-critical 8A+ loads; same thermal design applies | Select MAX42410AFOA+T when peak load exceeds 7.5A or long-term reliability at 8A is required. |
| LM61480RQR | Texas Instruments 36V/8A buck; 2.1MHz max fSW, 15μA IQ, QFN-16 package (non-pin-compatible) | Lacks dual-phase support and PGOOD threshold adjustability; higher fSW enables smaller magnetics but increases EMI risk | Choose LM61480RQR only when board redesign is acceptable and 2.1MHz operation aligns with system EMI requirements. |
Compared with MAX42410AFOA+T, the MAX42408AFOA+ offers tighter cost control for 8A-limited designs while retaining full feature parity; versus LM61480RQR, it provides superior dual-phase integration and lower quiescent current without requiring layout changes.
Availability
MAX42408AFOA+ is available at Aetrix Electronics and suitable for industrial automation, distributed DC power systems, and point-of-load applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX42408AFOA+ 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 was engineered for high-density, thermally constrained industrial power delivery-emphasizing ultra-low IQ, dual-phase scalability, and robust protection in compact FC2QFN packages.
FAQ
What is the maximum input voltage rating for MAX42408AFOA+?
The MAX42408AFOA+ has an absolute maximum input voltage (SUP to PGND) of +42V, with recommended operating range from 4.5V to 36V. Operation above 36V is not guaranteed and may trigger undervoltage lockout or damage the device. The 36V upper limit ensures reliable performance in 24V industrial systems with transient spikes.
Does MAX42408AFOA+ support adjustable output voltage, and what is the range?
Yes, MAX42408AFOA+ supports adjustable output voltage using an external resistor divider on the FB pin. For 400kHz operation (the frequency option for this part), the output can be set from 0.8V to 10V. The FB voltage accuracy is ±1.5% (0.788V–0.812V), ensuring precise regulation across the full range.
How does the dual-phase configuration work with MAX42408AFOA+?
In dual-phase mode, two MAX42408AFOA+ ICs operate with 180° phase shift: one as controller (SYNC high → SYNCOUT active), the other as target (SYNCOUT tied to BIAS). Their VEA pins are connected to share the error amplifier output, enabling dynamic current balancing. No external phase controller is required.
What is the quiescent current of MAX42408AFOA+ in skip mode?
The MAX42408AFOA+ draws 10μA quiescent current in skip mode, achieved by pulling the SYNC pin low. This ultra-low IQ enables energy-efficient standby operation in battery-backed or always-on industrial systems without sacrificing startup responsiveness.
Is MAX42408AFOA+ pin-compatible with other devices in the MAX424xx family?
Yes, MAX42408AFOA+ is pin-to-pin compatible with MAX42405/MAX42406 (5A–6A) and MAX42410AFOA+T (10A), sharing the same FC2QFN-17 package and pinout. This allows scalable power design-swap parts based on current requirements without PCB revision.
MAX42408AFOA+ 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
- 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+ FAQ
1.How can I place an order for MAX42408AFOA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42408AFOA+ 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+ reliable?
The price and inventory of MAX42408AFOA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42408AFOA+ is usually 5 days.
3.What payment methods are accepted for MAX42408AFOA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42408AFOA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42408AFOA+?
MAX42408AFOA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42408AFOA+ 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+?
For technical support, including MAX42408AFOA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42408AFOA+ requirements.
6.How does Aetrix verify that MAX42408AFOA+ is sourced from the original manufacturer or authorized distributors?
All MAX42408AFOA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX42408AFOA+?
All MAX42408AFOA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX42408AFOA+, 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+ part is unused and in its original packaging.
Return procedure for MAX42408AFOA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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