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Analog Devices Inc./Maxim Integrated MAX26406AFOAY+T
- Part No.:
- MAX26406AFOAY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26406AFOAY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,189
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Product details
Overview
MAX26406AFOAY+T 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 duty cycle-designed for automotive infotainment power rails and industrial 24V point-of-load regulation.
For engineers reviewing the MAX26406AFOAY+T datasheet, MAX26406AFOAY+T pinout, MAX26406AFOAY+T application, or MAX26406AFOAY+T equivalent, key selection criteria include its FC2QFN-17 package thermal performance (θJB = 10.2°C/W), ±1% output accuracy in FPWM mode, PGOOD monitoring capability, dual-phase VEA-based current sharing, and spread-spectrum EMI reduction option.
Technical Context
The MAX26406AFOAY+T 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 (e.g., 36V→3.3V) without pulse skipping.
It integrates high-side (45–90mΩ) and low-side (22–44mΩ) DMOS FETs, a 1.8V BIAS LDO, and a precision error amplifier with VEA pin for dual-phase current sharing. The architecture supports forced-PWM or automatic skip-mode via SYNC pin logic level, with hiccup-mode short-circuit protection and thermal shutdown at 165°C.
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 12V/24V POL designs. |
| Switching Frequency | 2.1MHz (or 400kHz) - allows use of sub-1μH inductors and <10μF ceramic output caps, minimizing board area. |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on automotive modules (e.g., CAN gateway standby). |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable power sequencing for FPGA I/O banks and microcontroller cores. |
| Duty Cycle Max | 99% - sustains regulated 5V output down to 5.05V input, critical for cold-crank automotive conditions. |
| PGOOD Threshold | 92–96% of VOUT - provides precise power-good assertion for system reset controllers without external comparators. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload in sealed enclosures without requiring external thermal sensors. |
Pinout & Package
MAX26406AFOAY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND) and symmetrical SUP/PGND layout optimized for low-EMI PCB routing and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | High-voltage compatible (up to 42V); pulls device into 4μA shutdown when low. |
| 2 BST | Bootstrap supply | Requires 0.1μF capacitor to LX; enables high-side gate drive above input rail. |
| 3,9 SUP | Main IC supply input | Accepts 3V–36V; decoupled with 1μF + 4.7μF ceramics for low-impedance input filtering. |
| 4,5,7,8 PGND | Power ground return | Multiple pins reduce IR drop and improve EMI; must be tied directly to thermal pad. |
| 6 LX | Switch node | Connects to inductor; high dv/dt node requiring tight loop area and guard ring. |
| 10 GND | Analog ground | Separate from PGND; connects to thermal pad for optimal noise isolation. |
| 11 BIAS | Internal 1.8V LDO output | Supplies internal circuitry; requires ≥2.2μF ceramic cap to PGND for stability. |
| 12 FB | Feedback voltage sense | Connect to BIAS for fixed 3.3V/5V; or resistor divider for adjustable outputs (0.8V–10V). |
| 13 OUT | Output voltage sense | Direct connection to buck output; used with FB for remote sensing in high-current layouts. |
| 14 VEA | Voltage-error amplifier output | Shared between controller/target in dual-phase; enables precise dynamic current sharing. |
| 15 PGOOD | Open-drain power-good signal | Asserts after soft-start and VOUT reaches 92–96%; requires external pull-up to BIAS or VOUT. |
| 16 SYNC | Mode selection & sync input | Pull to GND for skip mode; to BIAS for FPWM; accepts external clock up to 2.6MHz. |
| 17 SYNCOUT | 180° out-of-phase clock | Active only in FPWM mode; drives second phase in dual-IC configuration; open for single-phase. |
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 dithering centered at fSW minimizes peak EMI emissions without affecting regulation or efficiency. |
| Dual-phase capability | VEA pin enables <±3% current mismatch between two MAX26406AFOAY+T ICs in 12A configurations. |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and downstream loads during power-up sequences. |
| 99% dropout operation | Maintains regulation under brownout conditions (e.g., 5.5V input → 5V output), eliminating need for backup LDO. |
| MAXQ® power architecture | Delivers >70° phase margin and fast transient response (<50μs recovery from 2A step) without external compensation. |
Applications
| Automotive Infotainment Power | Industrial 24V Point-of-Load |
|---|---|
Use Scenario: Powering DSPs, display controllers, and audio codecs in head units with 12V battery input subject to cold-crank (5.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V POL regulator with PGOOD sequencing and thermal fault reporting. Use Value: 99% duty cycle sustains operation during cold-crank; ±1% accuracy ensures reliable DDR memory interface timing. | Use Scenario: Generating 3.3V for PLC I/O modules and fieldbus gateways operating from unregulated 24V industrial rails. IC Role / Device Role / Timing Role: High-efficiency, low-EMI DC-DC stage replacing discrete buck + LDO cascades. Use Value: 10μA skip-mode IQ extends uptime in battery-backed systems; FC2QFN thermal resistance (10.2°C/W) enables convection-only cooling. |
| Telecom Server Management | Networking Equipment Bias Supply |
Use Scenario: Providing 5V bias to baseband processors and PMBus-configurable power managers in 1RU servers. IC Role / Device Role / Timing Role: Secondary regulated supply synchronized to system clock via SYNC pin. Use Value: 2.1MHz operation avoids AM band interference; SYNCOUT enables deterministic dual-phase interleaving. | Use Scenario: Powering Ethernet PHYs, SFP+ transceivers, and switch fabric ASICs requiring clean, low-noise 3.3V. IC Role / Device Role / Timing Role: Low-EMI POL regulator with PGOOD monitoring for hot-swap controllers. Use Value: Silent Switcher® layout reduces conducted noise on shared 3.3V planes; ±1% accuracy meets IEEE 802.3 compliance margins. |
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 sharing; uses different pinout (16-pin WQFN). | Automotive AEC-Q100 Grade 1, but no built-in PGOOD threshold adjustment or 99% dropout. | Select when AEC-Q100 qualification is mandatory and dual-phase operation is not required. |
| TPS546B24RVFT | 36V input, 10A, 2.2MHz, supports PMBus, but larger 28-pin VQFN package and higher IQ (15μA). | Targeted at digital power systems needing telemetry; no integrated spread-spectrum or Silent Switcher EMI optimization. | Select when telemetry, programmable soft-start, or higher current (>6A) is prioritized over minimal EMI footprint. |
Compared with LM61460QWRNXTQ1 and TPS546B24RVFT, the MAX26406AFOAY+T delivers superior EMI performance via Silent Switcher® layout and spread-spectrum, tighter output accuracy (±1% vs ±1.5%), and true dual-phase current sharing without external amplifiers-making it optimal for space- and noise-constrained automotive and industrial POL designs.
Availability
MAX26406AFOAY+T is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial 24V point-of-load regulation, and telecom server management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX26406AFOAY+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 MAX26406AFOAY+T belongs to the MAX264xx Silent Switcher® buck converter family, engineered specifically for ultra-low EMI, high-current POL applications in automotive ADAS, infotainment, and industrial automation where board space, thermal limits, and EMC compliance are critical.
FAQ
What is the maximum continuous output current supported by the MAX26406AFOAY+T?
The MAX26406AFOAY+T supports up to 6A continuous output current under typical thermal conditions (TA ≤ +70°C, 4-layer board). Derating applies above ambient temperature, with junction temperature limited to +125°C for 95,000 hours of operation. The device's 7.5A–10A current-limit threshold (ILIM) ensures robust overload protection while sustaining full 6A output with proper layout and heatsinking.
Does the MAX26406AFOAY+T require external compensation components?
No, the MAX26406AFOAY+T does not require external compensation components. Its MAXQ® power architecture integrates internal loop compensation optimized for stability across the full 0.8V–10V output range and 3V–36V input range. This eliminates the need for external RC networks, reducing BOM count and layout sensitivity while maintaining >70° phase margin and fast transient response.
Can the MAX26406AFOAY+T operate with an input voltage below 3V?
No, the MAX26406AFOAY+T has a specified minimum input voltage of 3V per its absolute maximum and recommended operating conditions. Operation below 3V violates the UVLO threshold (VSUP_UVLO_R = 2.945V min), causing unpredictable startup behavior or failure to regulate. For sub-3V applications, consider alternative regulators such as the MAX17504 or LTC3637.
How is the output voltage set on the MAX26406AFOAY+T?
The MAX26406AFOAY+T supports both fixed and adjustable outputs. For fixed 3.3V or 5.0V, connect the FB pin directly to the BIAS pin. For adjustable outputs (0.8V–10V), use an external resistor divider from OUT to GND with RFB2 ≤ 100kΩ and RFB1 calculated using RFB1 = RFB2 × (VOUT/VFB − 1), where VFB = 0.800V (typ). The device's internal feedback reference is trimmed to ±0.6% over temperature.
Is the MAX26406AFOAY+T pin-compatible with other members of the MAX264xx family?
Yes, the MAX26406AFOAY+T is pin-compatible with MAX26404AFOAY+T and MAX26405AFOAY+T within the same FC2QFN-17 package. Differences lie in current-limit thresholds (ILIM), output voltage options, and ordering codes-not pin function or layout. This enables design reuse across 4A/5A/6A variants without PCB revision.
MAX26406AFOAY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Silent Switcher®
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 6A
- Frequency - Switching:
- 2.1MHz
- 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)
MAX26406AFOAY+T FAQ
1.How can I place an order for MAX26406AFOAY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26406AFOAY+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 MAX26406AFOAY+T reliable?
The price and inventory of MAX26406AFOAY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26406AFOAY+T is usually 5 days.
3.What payment methods are accepted for MAX26406AFOAY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26406AFOAY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26406AFOAY+T?
MAX26406AFOAY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26406AFOAY+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 MAX26406AFOAY+T?
For technical support, including MAX26406AFOAY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26406AFOAY+T requirements.
6.How does Aetrix verify that MAX26406AFOAY+T is sourced from the original manufacturer or authorized distributors?
All MAX26406AFOAY+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 MAX26406AFOAY+T meets industry standards.
7.What is the process for return or replacement of MAX26406AFOAY+T?
All MAX26406AFOAY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26406AFOAY+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 MAX26406AFOAY+T part is unused and in its original packaging.
Return procedure for MAX26406AFOAY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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