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Analog Devices Inc./Maxim Integrated MAX42406AFOA+T
- Part No.:
- MAX42406AFOA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX42406AFOA+T.pdf
- Description:
- IC REG BUCK ADJ 6A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
MAX42406AFOA+T from Analog Devices is a fully integrated 36V, 6A synchronous buck converter with internal high-side and low-side MOSFETs, 400kHz/1.5MHz fixed switching frequency options, programmable output voltage (0.8V–12V), and PGOOD monitoring - designed for industrial point-of-load regulation in space-constrained systems.
For engineers reviewing the MAX42406AFOA+T datasheet, MAX42406AFOA+T pinout, MAX42406AFOA+T application, or MAX42406AFOA+T equivalent, key selection considerations include input voltage range (4.5V–36V), dropout operation capability, dual-phase current-sharing via VEA/SYNCOUT, thermal shutdown at 175°C, and FC2QFN package EMI performance.
Technical Context
The MAX42406AFOA+T implements average current-mode control with a 36ns minimum on-time, enabling stable high-step-down ratios without cycle skipping. Its architecture supports both forced-PWM (SYNC tied to BIAS) and automatic skip-mode (SYNC grounded), delivering 20μA quiescent current at no load.
Dual-phase operation is enabled by synchronized 180° out-of-phase clocking via SYNCOUT and dynamic current sharing through shared VEA pins - requiring FPWM mode only. The device integrates a 1.8V BIAS regulator with switchover logic and features hiccup-mode short-circuit protection with 25ms/35ms off-times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial supply rails including 24V and 36V battery/bus systems. |
| Output Current | 6A continuous - rated for sustained full-load operation with thermal derating per θJA = 29°C/W on 4-layer board. |
| Switching Frequency | 400kHz or 1.5MHz (fixed) - enables compact magnetics and reduced output ripple; not user-adjustable. |
| Output Voltage Range | 0.8V–12V (at 400kHz); 0.8V–10V (at 1.5MHz) - set externally via resistor divider on FB/OUT pins. |
| Quiescent Current | 20μA in skip mode - minimizes standby power loss in always-on industrial subsystems. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| PGOOD Threshold | 92%–96% of VOUT - provides precise power-good assertion for downstream sequencers or microcontrollers. |
Pinout & Package
MAX42406AFOA+T is housed in a 3.5mm × 3.75mm, 17-pin flip-chip quad flat no-lead (FC2QFN) package with symmetrical VIN/PGND layout for optimized EMI performance and thermal dissipation (θJC = 10.51°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-compatible activation signal; pulls device into shutdown (4μA IQ) when low. |
| BST | Bootstrap supply | Connects 0.1μF capacitor between BST and LX to drive high-side MOSFET gate above SUP rail. |
| SUP | Main supply input | Accepts 4.5V–36V input; requires parallel 1μF + 4.7μF ceramic capacitors for stability and EMI suppression. |
| PGND | Power ground | Four dedicated pins (pins 4,5,7,8) must be connected together and to input/output capacitor grounds. |
| LX | Switch node | Connects to inductor; carries high di/dt switching current - requires minimal loop area for EMI control. |
| GND | Analog ground | Separate AGND reference for feedback and error amplifier; must be tied to PGND at single point. |
| BIAS | Internal LDO output | 1.8V regulated supply for internal circuitry; requires ≥2.2μF ceramic capacitor to PGND. |
| FB | Feedback input | Senses resistor-divider ratio from OUT to GND; regulates output with ±1.6% accuracy (0.787–0.813V threshold). |
| OUT | Output sense | Direct connection to regulated output rail; used with FB to close voltage loop. |
| VEA | Voltage-error amplifier I/O | Controller outputs error signal here; target receives it for precise current sharing in dual-phase setups. |
| PGOOD | Open-drain status | Asserts low when VOUT is within ±4% of target; requires external pull-up for system reset or sequencing. |
| SYNC | Mode/frequency control | Ground = skip mode; BIAS = forced-PWM; external clock = synchronization source (360–1.845MHz). |
| SYNCOUT | 180° phase clock | Outputs inverted clock for second phase; inactive in skip mode - only functional in FPWM configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET integration | Eliminates need for external high-side/low-side MOSFETs and drivers - reduces BOM count and layout complexity. |
| Dual-phase current sharing | ±3% current mismatch between phases using shared VEA pin - enables 12A total output with two ICs. |
| Symmetrical FC2QFN package | Reduces common-mode EMI emissions by balancing high-di/dt paths across package centerline. |
| Ultra-low-light-load IQ | 20μA quiescent current in skip mode - extends battery life or reduces standby losses in always-on systems. |
| Robust protection suite | Includes overtemperature shutdown (175°C), hiccup-mode short-circuit response, and input UVLO (2.95V rising). |
Applications
| Industrial PLC I/O Modules | Factory Automation Sensors |
|---|---|
Use Scenario: Powering isolated analog input/output channels in modular PLC backplanes with 24V DC bus. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 5V/3.3V to ADCs, DACs, and isolation interfaces. Use Value: Wide 4.5V–36V input accommodates brownout conditions; PGOOD enables safe channel enable/disable sequencing. | Use Scenario: Supplying 3.3V to MEMS pressure/temperature sensors and CAN transceivers in robotic end-effectors. IC Role / Device Role / Timing Role: Compact, EMI-optimized local regulator co-located with sensor signal chain. Use Value: Symmetrical FC2QFN layout minimizes conducted noise coupling into sensitive analog front-ends. |
| Distributed DC Power Rails | Motor Drive Auxiliary Supplies |
Use Scenario: Generating 12V/5V rails from 24V or 36V main bus in modular machine control cabinets. IC Role / Device Role / Timing Role: High-current secondary regulator feeding multiple downstream DC-DC converters. Use Value: Dual-phase capability allows scalable 6A→12A output without redesign; thermal shutdown prevents cascade failures. | Use Scenario: Providing isolated gate-driver bias and MCU core voltage in servo drive power stages. IC Role / Device Role / Timing Role: Auxiliary supply operating alongside high-noise IGBT/MOSFET switching events. Use Value: Average current-mode control rejects switching noise on current-sense path - improves regulation stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42405AFOA+T | 5A rated (vs. 6A), lower ILIM threshold (6.5–8.5A vs. 7.5–10A), identical pinout and features. | Suitable where peak load current remains ≤5A; same PCB layout and firmware. | Select MAX42405AFOA+T for cost-sensitive designs with marginally lower current requirements. |
| LM61460RQWR | TI part; 6A, 3V–36V input, 2.1MHz switching, different pinout, no dual-phase VEA sharing. | Requires new layout; lacks native dual-phase current-sharing architecture and symmetrical EMI package. | Choose LM61460RQWR only if higher frequency (2.1MHz) or TI ecosystem alignment outweighs EMI and multiphase advantages. |
Compared with MAX42405AFOA+T and LM61460RQWR, the MAX42406AFOA+T uniquely combines 6A capability, dual-phase VEA-based current sharing, and symmetrical FC2QFN EMI optimization - making it optimal for high-density industrial power modules requiring scalability and noise immunity.
Availability
MAX42406AFOA+T 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 support, and RoHS-compliant packaging.
Supply support for MAX42406AFOA+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 MAX42405/MAX42406 family was engineered specifically for rugged, space-constrained industrial point-of-load conversion - emphasizing wide input range, dual-phase scalability, and EMI-hardened packaging.
FAQ
What is the maximum output current rating for the MAX42406AFOA+T?
The MAX42406AFOA+T is rated for 6A continuous output current under specified thermal conditions (θJA = 29°C/W on 4-layer board). Its current-limit threshold is 7.5A to 10A, and it supports dual-phase operation to deliver up to 12A when paired with a second MAX42406AFOA+T in controller/target configuration.
Does the MAX42406AFOA+T support adjustable switching frequency?
No, the MAX42406AFOA+T does not support user-adjustable switching frequency. It offers two factory-fixed options: 400kHz or 1.5MHz - selected during manufacturing and indicated by the part number suffix. External synchronization is supported within ±10% of the internal frequency, but the base frequency cannot be tuned.
How does the MAX42406AFOA+T achieve low EMI performance?
The MAX42406AFOA+T achieves low EMI through its symmetrical FC2QFN package layout - with balanced SUP and PGND pins flanking the center - which minimizes differential-mode loop area and common-mode current. Combined with average current-mode control and integrated MOSFETs, this reduces high-frequency noise injection into PCB planes.
Can the MAX42406AFOA+T operate in dropout mode?
Yes, the MAX42406AFOA+T supports dropout operation by achieving up to 96% maximum duty cycle, allowing regulation when input voltage approaches output voltage. This enables reliable operation in brownout scenarios common in industrial 24V systems, maintaining output stability down to VSUP ≈ VOUT / 0.96.
What is the purpose of the VEA pin on the MAX42406AFOA+T?
The VEA pin on the MAX42406AFOA+T serves as the voltage-error amplifier output in controller mode and the current-error amplifier input in target mode. When two MAX42406AFOA+T devices are configured in dual-phase, connecting their VEA pins enables precise dynamic current sharing (<±3% mismatch) without external op-amps or sensing resistors.
MAX42406AFOA+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:
- 6A
- Frequency - Switching:
- 400kHz
- 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)
MAX42406AFOA+T FAQ
1.How can I place an order for MAX42406AFOA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42406AFOA+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 MAX42406AFOA+T reliable?
The price and inventory of MAX42406AFOA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42406AFOA+T is usually 5 days.
3.What payment methods are accepted for MAX42406AFOA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42406AFOA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42406AFOA+T?
MAX42406AFOA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42406AFOA+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 MAX42406AFOA+T?
For technical support, including MAX42406AFOA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42406AFOA+T requirements.
6.How does Aetrix verify that MAX42406AFOA+T is sourced from the original manufacturer or authorized distributors?
All MAX42406AFOA+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 MAX42406AFOA+T meets industry standards.
7.What is the process for return or replacement of MAX42406AFOA+T?
All MAX42406AFOA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX42406AFOA+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 MAX42406AFOA+T part is unused and in its original packaging.
Return procedure for MAX42406AFOA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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