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Analog Devices Inc./Maxim Integrated MAX26406AFOCY+
- Part No.:
- MAX26406AFOCY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26406AFOCY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
MAX26406AFOCY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 6A continuous output current with 3V–36V input range and fixed 5V or 3.3V output (or adjustable 0.8V–10V). It features 2.1MHz/400kHz fixed switching frequency, 10μA no-load quiescent current in skip mode, and 99% dropout operation-ideal for automotive infotainment power rails and industrial 24V point-of-load systems.
For engineers reviewing the MAX26406AFOCY+ datasheet, MAX26406AFOCY+ pinout, MAX26406AFOCY+ application, or MAX26406AFOCY+ equivalent, key selection criteria include its FC2QFN-17 package thermal performance (θJB = 10.2°C/W), dual-phase current-sharing accuracy via VEA pin, spread-spectrum EMI reduction, and ±1% output voltage accuracy in forced-PWM mode at no load.
Technical Context
The MAX26406AFOCY+ implements average current-mode control with internal slope compensation, enabling robust noise immunity and stable operation across wide VIN/VOUT ratios. Its 33ns minimum on-time supports high step-down ratios without pulse skipping, while the MAXQ® power architecture delivers precise transient response and optimized phase margin.
Dual-phase operation is enabled via SYNCOUT (180° out-of-phase clock) and VEA (shared error amplifier node), supporting up to 12A combined output with dynamic current sharing. The device operates in forced-PWM or skip mode, with EN-compatible shutdown (4μA IQ) and integrated overtemperature/short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery (9V–16V) and industrial 24V rails without pre-regulation. |
| Output Current | 6A continuous - enables single-chip replacement of discrete 5A solutions in space-constrained PCBs. |
| Switching Frequency | 2.1MHz (or 400kHz) - allows use of sub-1μH inductors and <10μF ceramic output capacitors for compact layout. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules and IoT edge nodes. |
| Output Accuracy | ±1% in FPWM mode at no load - ensures reliable logic-level compliance for FPGA I/O banks and microcontroller cores. |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + 0.36V, critical for cold-crank automotive conditions. |
| Thermal Resistance θJB | 10.2°C/W (EV kit) - enables >4W dissipation at ΔT = 40°C with standard 4-layer board, reducing need for heatsinks. |
Pinout & Package
MAX26406AFOCY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (PGND-connected) and symmetrical VIN/PGND pin arrangement for optimal EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable control input | High-voltage compatible (up to 42V); pulls device into 4μA shutdown state when low. |
| BST | Bootstrap supply | Requires 0.1μF capacitor between BST and LX to drive high-side MOSFET gate above SUP. |
| SUP (Pins 3,9) | Main IC supply input | Accepts 3V–36V; decoupled with 1μF + 4.7μF ceramic for low-impedance path during high di/dt switching. |
| PGND (Pins 4,5,7,8) | Power ground return | Multiple low-inductance paths to minimize ground bounce and improve EMI performance. |
| LX | Switch node | Connects to inductor; carries high-frequency AC current; requires tight layout to reduce radiated emissions. |
| BIAS | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND for stability and noise rejection. |
| FB | Feedback input | Connect to BIAS for fixed 3.3V/5V; or external resistor divider for 0.8V–10V adjustment. |
| VEA | Voltage-error amplifier output/input | Shared between controller/target in dual-phase config to enforce matched current sharing. |
| PGOOD | Open-drain power-good signal | Asserts after soft-start and VOUT reaches 92–96% of target; requires external pull-up for system sequencing. |
| SYNC | Mode select & sync input | Pull to GND for skip mode; to BIAS for forced-PWM; accepts external clock up to 2.6MHz. |
| SYNCOUT | 180° out-of-phase clock output | Active only in FPWM mode; drives second phase in dual-phase configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters through balanced hot-loop layout and integrated bypass caps. |
| Spread-spectrum modulation | ±3% frequency dither centered at fSW minimizes peak EMI emissions without affecting loop stability or output ripple. |
| Dual-phase capability | Enables 12A output with <±3% current mismatch between phases using shared VEA and SYNCOUT signals. |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and downstream loads during power-up sequencing. |
| 99% duty-cycle dropout | Maintains regulation under brownout conditions (e.g., automotive cold-crank to 6V) without external LDO post-regulation. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering DSPs, display controllers, and USB hubs in head units with 12V battery input subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V POL regulator with PGOOD sequencing, dropout operation, and EMI-compliant Silent Switcher topology. Use Value: Eliminates need for external EMI filters and heatsinks while meeting CISPR-25 Class 5 radiated emissions limits. | Use Scenario: Providing isolated 3.3V rail for ARM-based PLC communication processors operating from 24V industrial bus. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter with 10μA skip-mode IQ for low-power standby states. Use Value: Enables fanless enclosure design with full 6A output capability at +70°C ambient without derating. |
| Telecom Base Station RF Card | Medical Imaging Sensor Interface |
Use Scenario: Generating clean 5V supply for RF front-end ICs in 4G/5G small cells where spectral purity and low noise are critical. IC Role / Device Role / Timing Role: Low-noise POL converter with 2.1MHz switching and spread-spectrum to avoid interference with adjacent RF bands. Use Value: Achieves <−65dBc conducted noise at 2.1GHz carrier with no additional LC filtering beyond recommended input/output caps. | Use Scenario: Powering precision ADCs and analog front-ends in portable ultrasound probes requiring ultra-low EMI and stable 3.3V reference. IC Role / Device Role / Timing Role: EMI-optimized buck regulator with ±1% output accuracy and PGOOD monitoring for safety-critical power validation. Use Value: Meets IEC 60601-1 EMI requirements for Class BF medical devices without shielded inductors or ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61460QWRNXTQ1 | 40V input, 6A, 2.1MHz, but lacks spread-spectrum and dual-phase VEA interface; higher RDS(on) (65mΩ HS / 32mΩ LS). | Automotive AEC-Q100 Grade 1, but no built-in PGOOD threshold hysteresis or 99% dropout mode. | Select when AEC-Q100 qualification is mandatory and dual-phase operation is not required. |
| TPS546B24RVFT | 36V input, 10A, 2.2MHz, supports PMBus, but larger 5mm × 5.5mm QFN-32 package and no integrated spread-spectrum. | Designed for server VR13/IMVP8 compliance with digital telemetry; higher cost and complexity for simple POL use. | Select when digital monitoring, telemetry, or >6A output is needed and board area is less constrained. |
Compared with LM61460QWRNXTQ1 and TPS546B24RVFT, the MAX26406AFOCY+ offers superior EMI performance via Silent Switcher + spread-spectrum, smaller footprint (3.5mm × 3.75mm), and native dual-phase support-making it optimal for space-limited, noise-sensitive automotive and industrial designs where analog control simplicity is preferred over digital configurability.
Availability
MAX26406AFOCY+ is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, telecom RF cards, and medical sensor interfaces requiring stable component supply, long lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26406AFOCY+ 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.
The MAX26404/MAX26405/MAX26406 family was designed specifically for compact, low-EMI DC-DC conversion in harsh environments-emphasizing automotive-grade reliability, wide input range, and seamless dual-phase scalability without external controllers.
FAQ
What is the maximum output current supported by the MAX26406AFOCY+?
The MAX26406AFOCY+ delivers up to 6A continuous output current under typical thermal conditions (TA ≤ +70°C, 4-layer EV kit). Derating applies above +70°C ambient per its 10.2°C/W junction-to-board thermal resistance; at +105°C ambient, output current is reduced to ~4.2A to maintain TJ ≤ +125°C. This rating assumes proper PCB copper area, thermal vias under the exposed pad, and recommended input/output capacitor layout per the datasheet.
Does the MAX26406AFOCY+ support adjustable output voltage?
Yes, the MAX26406AFOCY+ supports adjustable output voltage from 0.8V to 10V using an external resistor divider connected between OUT, FB, and GND. For fixed outputs, connect FB directly to BIAS to select factory-configured 3.3V or 5.0V. The feedback regulation voltage is 0.800V ±1.6%, and RFB2 (FB-to-GND resistor) must be ≤100kΩ to ensure accuracy and stability per the datasheet's Equation 1.
How does the MAX26406AFOCY+ achieve low EMI performance?
The MAX26406AFOCY+ achieves low EMI through three integrated techniques: (1) Silent Switcher® architecture with balanced, symmetric hot-loop layout and integrated bootstrap/bypass capacitors; (2) spread-spectrum frequency modulation (±3% around fSW) to spread energy across a bandwidth; and (3) FC2QFN-17 package with symmetrical VIN/PGND pin placement that minimizes loop area and common-mode currents. These features collectively reduce peak radiated emissions by >30dB compared to conventional buck converters.
Can the MAX26406AFOCY+ operate in dual-phase configuration?
Yes, the MAX26406AFOCY+ supports dual-phase operation for up to 12A total output. One device acts as controller (driving SYNCOUT), the other as target (receiving SYNCOUT and sharing VEA). Both must operate in forced-PWM mode; skip mode disables SYNCOUT. The VEA pin connection enforces dynamic current sharing with <±3% mismatch across load and temperature, eliminating need for external current-sense resistors or complex phase-control ICs.
What protection features are integrated into the MAX26406AFOCY+?
The MAX26406AFOCY+ integrates overtemperature shutdown (165°C with 20°C hysteresis), cycle-by-cycle overcurrent limiting (7.5A–10A depending on variant), hiccup-mode short-circuit protection (25ms off-time), and input undervoltage lockout (2.945V rising, 2.655V falling). It also includes BIAS UVLO (1.53V–1.63V), PGOOD monitoring with 92–96% threshold window, and robust ESD protection (±2kV HBM).
MAX26406AFOCY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Silent Switcher®
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 6A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX26406AFOCY+ FAQ
1.How can I place an order for MAX26406AFOCY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26406AFOCY+ 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 MAX26406AFOCY+ reliable?
The price and inventory of MAX26406AFOCY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26406AFOCY+ is usually 5 days.
3.What payment methods are accepted for MAX26406AFOCY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26406AFOCY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26406AFOCY+?
MAX26406AFOCY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26406AFOCY+ 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 MAX26406AFOCY+?
For technical support, including MAX26406AFOCY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26406AFOCY+ requirements.
6.How does Aetrix verify that MAX26406AFOCY+ is sourced from the original manufacturer or authorized distributors?
All MAX26406AFOCY+ 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 MAX26406AFOCY+ meets industry standards.
7.What is the process for return or replacement of MAX26406AFOCY+?
All MAX26406AFOCY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26406AFOCY+, 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 MAX26406AFOCY+ part is unused and in its original packaging.
Return procedure for MAX26406AFOCY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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