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Analog Devices Inc./Maxim Integrated MAX42406AFOB+
- Part No.:
- MAX42406AFOB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX42406AFOB+.pdf
- Description:
- IC REG BUCK ADJ 6A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:496
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Product details
Overview
MAX42406AFOB+ from Analog Devices is a fully integrated 36V, 6A synchronous buck converter with internal high-side and low-side MOSFETs, fixed 1.5MHz switching frequency, programmable output voltage (0.8V–10V), and PGOOD monitoring - designed for industrial point-of-load regulation in space-constrained systems.
For engineers reviewing the MAX42406AFOB+ datasheet, MAX42406AFOB+ pinout, MAX42406AFOB+ application, or MAX42406AFOB+ equivalent, key selection criteria include dropout operation at >96% duty cycle, 20μA no-load quiescent current in skip mode, dual-phase current-sharing capability via VEA/SYNCOUT, and FC2QFN thermal/EMI-optimized 3.5mm × 3.75mm package.
Technical Context
The MAX42406AFOB+ implements average current-mode control with a 36ns minimum on-time, enabling stable high-step-down ratios without cycle skipping. Its architecture integrates a 1.8V BIAS regulator, internal soft-start (3.5ms at 1.5MHz), and dynamic current sharing across dual-phase configurations using shared VEA feedback.
It supports forced-PWM or automatic skip-mode operation via SYNC pin logic level, delivers precise output regulation (±1.6% FB accuracy), and includes hiccup-mode short-circuit protection with 25ms/35ms shutdown intervals depending on switching frequency - all within a -40°C to +125°C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial input rails including 12V, 24V, and 36V battery/supply systems. |
| Output Current | 6A continuous - rated for sustained full-load operation with thermal derating per θJA = 29°C/W on 4-layer EV board. |
| Switching Frequency | Fixed 1.5MHz - enables compact external components (e.g., 1.2μH inductor, 4×22μF output caps) and reduced output ripple. |
| Quiescent Current | 20μA at no load in skip mode - extends battery life in always-on industrial sensors or remote I/O modules. |
| Feedback Accuracy | ±1.6% (0.787V–0.813V at VFB) - ensures tight output regulation across temperature and line/load variations. |
| PGOOD Threshold | 92–96% of VOUT rising - provides reliable power-good signaling for FPGA/CPU reset sequencing. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
MAX42406AFOB+ is housed in a 3.5mm × 3.75mm, 17-pin flip-chip quad flat no-lead (FC2QFN) package with symmetrical VIN/PGND layout for superior EMI performance and enhanced thermal dissipation (θJC = 10.51°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage-compatible activation signal; pulls device into ultra-low 4μA shutdown when low. |
| 2 BST | Bootstrap supply | Connects 0.1μF capacitor to LX to drive high-side MOSFET gate above SUP rail. |
| 3,9 SUP | Main supply input | Dual pins reduce IR drop and improve EMI; requires parallel 1μF + 4.7μF ceramic capacitors to PGND. |
| 4,5,7,8 PGND | Power ground | Four dedicated low-impedance paths for high-current return, minimizing ground bounce and thermal rise. |
| 6 LX | Switch node | Connects to inductor; carries high di/dt current - must be routed with minimal loop area for EMI control. |
| 10 GND | Analog ground | Separate AGND reference for FB/VEA/BIAS to avoid noise coupling into feedback path. |
| 11 BIAS | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND for stability and transient response. |
| 12 FB | Feedback input | Senses resistor-divider ratio from OUT to set regulated output; leakage <100nA preserves accuracy. |
| 13 OUT | Output sense | Direct connection to regulated output rail; used with FB to close voltage control loop. |
| 14 VEA | Voltage error amplifier output/input | Enables precise current sharing in dual-phase mode when connected between controller and target ICs. |
| 15 PGOOD | Open-drain power-good | Active-low signal indicating VOUT within ±4% window; requires external pull-up for system reset coordination. |
| 16 SYNC | Mode selection clock | Tied to BIAS → forced PWM; tied to GND → skip mode; accepts external clock up to 1.845MHz. |
| 17 SYNCOUT | 180° out-of-phase clock | Provides synchronized timing for second phase in dual-phase configuration; inactive in skip mode. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Delivers superior noise immunity in noisy industrial environments and enables accurate dynamic current sharing across phases. |
| Dual-phase capability with VEA | Supports up to 12A total output with <1% current mismatch between phases, eliminating need for external current-sense amplifiers. |
| Symmetrical FC2QFN package | Reduces EMI emissions by balancing high-di/dt current paths and improves thermal resistance (θJA = 29°C/W on 4-layer board). |
| Ultra-low IQ skip mode | 20μA no-load quiescent current extends runtime in battery-backed PLC I/O or smart sensor nodes. |
| Hiccup-mode short-circuit protection | Automatically cycles off/on during hard shorts (25ms at 400kHz, 35ms at 1.5MHz), preventing thermal runaway without latch-off. |
| Programmable soft-start | 3.5ms ramp time at 1.5MHz prevents inrush current damage to input capacitors and downstream loads. |
Applications
| Industrial PLC I/O Module | Factory Automation Sensor Hub |
|---|---|
Use Scenario: Powering isolated analog input/output channels and microcontroller peripherals in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator delivering 6A peak to multiple ADCs, DACs, and isolation drivers. Use Value: Dropout operation maintains regulation during brownouts; PGOOD enables safe firmware boot sequencing after power stabilization. |
Use Scenario: Supplying 5V/3.3V rails to distributed wireless vibration/temperature sensors in predictive maintenance gateways. IC Role / Device Role / Timing Role: High-efficiency buck stage converting 24V field bus to low-noise sensor supply with minimal heat buildup. Use Value: 20μA skip-mode IQ extends battery life in energy-harvested edge nodes; symmetrical FC2QFN minimizes conducted EMI near sensitive RF sections. |
| Distributed DC Power System | Motor Drive Auxiliary Supply |
Use Scenario: Local regulation for FPGA-based motion control logic and gate driver bias in multi-axis servo drives. IC Role / Device Role / Timing Role: Secondary 1.8V/3.3V rail generator supporting FPGA core and I/O banks with tight voltage tolerance. Use Value: 0.8V–10V programmability allows single BOM variant to support multiple FPGA families; 36ns min-on-time enables 12V-to-1.8V conversion in one stage. |
Use Scenario: Providing isolated 15V gate drive and 5V logic supply for half-bridge IGBT/MOSFET drivers in HVAC compressors. IC Role / Device Role / Timing Role: Robust auxiliary power source handling 36V transients and reverse-polarity events in motor control cabinets. Use Value: 4.5V–36V input range accommodates battery backup and regenerative braking spikes; overtemperature shutdown prevents driver failure during stall 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 |
|---|---|---|---|
| MAX42405AFOB+ | 5A rated (vs. 6A), lower ILIM threshold (6.5–8.5A vs. 7.5–10A), identical pinout and features. | Better suited for cost-sensitive 5A designs where margin is sufficient; shares same PCB footprint and layout. | Select MAX42405AFOB+ when full 6A headroom is unnecessary and BOM cost optimization is prioritized. |
| MPM3695-100 from Monolithic Power Systems | 10A rating, 2.2MHz switching, different pinout (13-pin QFN), no VEA-based dual-phase support. | Targets higher-current applications requiring smaller inductors; lacks native current-sharing architecture for multiphase scaling. | Choose MPM3695-100 only when >6A output is required and dual-phase synchronization is not needed. |
Compared with MAX42405AFOB+, the MAX42406AFOB+ provides higher current capability and improved thermal margin for sustained 6A loads, while the MPM3695-100 offers greater peak current but sacrifices precision dual-phase current sharing and industrial-grade fault protection.
Availability
MAX42406AFOB+ is available at Aetrix Electronics and suitable for industrial automation, point-of-load regulation, and distributed DC power systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX42406AFOB+ 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, Inc. 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 MAX42405/MAX42406 family was engineered specifically for rugged industrial point-of-load conversion - emphasizing wide VIN range, low IQ, dual-phase scalability, and robust protection in compact FC2QFN packages.
FAQ
What is the maximum output current rating for MAX42406AFOB+?
The MAX42406AFOB+ is rated for 6A continuous output current under specified thermal conditions (θJA = 29°C/W on 4-layer EV board). Its current-limit threshold is 7.5A to 10A, and it sustains full load across -40°C to +125°C ambient with proper PCB copper area and airflow. Derating applies above +70°C ambient per 34.48mW/°C.
Does MAX42406AFOB+ support dual-phase operation, and how is it configured?
Yes, MAX42406AFOB+ supports dual-phase operation using SYNCOUT and VEA pins. One IC acts as controller (SYNC tied to BIAS), generating 180° out-of-phase clock on SYNCOUT; the second acts as target (SYNCOUT connected to BIAS, VEA linked to controller's VEA). This achieves <1% current mismatch without external components.
What is the purpose of the VEA pin on MAX42406AFOB+?
The VEA pin on MAX42406AFOB+ serves as the voltage error amplifier output in controller mode and current-error amplifier input in target mode. When interconnected between two ICs, it enables precise dynamic current sharing in dual-phase configurations - a key differentiator versus basic parallel buck implementations.
Can MAX42406AFOB+ operate in dropout, and what is its maximum duty cycle?
Yes, MAX42406AFOB+ supports dropout operation with up to 96% maximum duty cycle, allowing regulation even when input voltage approaches output voltage (e.g., 5.5V IN → 5V OUT). This is critical for industrial brownout resilience and battery-powered systems nearing end-of-discharge.
What are the recommended external components for a 3.3V/6A design using MAX42406AFOB+ at 1.5MHz?
For a 3.3V/6A design at 1.5MHz, Analog Devices recommends a 1.2μH shielded inductor, 4×22μF X5R/X7R ceramic output capacitors, 4.7μF + 0.1μF input capacitors on SUP pins, 2.2μF BIAS capacitor, and 49.9kΩ/15.8kΩ FB divider. CFF = 33pF improves transient response per datasheet Table 1.
MAX42406AFOB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tray
- 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:
- 6A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX42406AFOB+ FAQ
1.How can I place an order for MAX42406AFOB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42406AFOB+ 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 MAX42406AFOB+ reliable?
The price and inventory of MAX42406AFOB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42406AFOB+ is usually 5 days.
3.What payment methods are accepted for MAX42406AFOB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42406AFOB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42406AFOB+?
MAX42406AFOB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42406AFOB+ 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 MAX42406AFOB+?
For technical support, including MAX42406AFOB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42406AFOB+ requirements.
6.How does Aetrix verify that MAX42406AFOB+ is sourced from the original manufacturer or authorized distributors?
All MAX42406AFOB+ 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 MAX42406AFOB+ meets industry standards.
7.What is the process for return or replacement of MAX42406AFOB+?
All MAX42406AFOB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX42406AFOB+, 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 MAX42406AFOB+ part is unused and in its original packaging.
Return procedure for MAX42406AFOB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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