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Analog Devices Inc./Maxim Integrated MAX26406AFOAY+
- Part No.:
- MAX26406AFOAY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26406AFOAY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
MAX26406AFOAY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 6A continuous output current with 3V to 36V input range, fixed 2.1MHz switching frequency, ±1% output voltage accuracy in FPWM mode, and 10μA quiescent current in skip mode - designed for automotive point-of-load regulation in 12V/24V systems.
For engineers reviewing the MAX26406AFOAY+ datasheet, MAX26406AFOAY+ pinout, MAX26406AFOAY+ application, or MAX26406AFOAY+ equivalent, key selection criteria include its 99% dropout duty cycle, dual-phase VEA-based current sharing, spread-spectrum EMI reduction, FC2QFN thermal performance, and programmable 0.8V–10V output via FB resistor-divider.
Technical Context
The MAX26406AFOAY+ implements average current-mode control with internal slope compensation, enabling high noise immunity and stable operation across wide VIN/VOUT ratios. Its architecture integrates high-side (45mΩ typ) and low-side (22mΩ typ) DMOS FETs, a 1.8V BIAS regulator, and a precision error amplifier with VEA pin for dual-phase current sharing.
It supports forced-PWM and skip-mode operation via SYNC pin logic, features 2.5ms internal soft-start, 33ns minimum on-time for high step-down ratios, and hiccup-mode short-circuit protection triggered at <50% VOUT under current limit - all within a thermally optimized 3.5mm × 3.75mm FC2QFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery rails including cold-crank (4.5V) and load-dump (36V) conditions. |
| Output Current | 6A continuous - rated for sustained high-current loads without external current sensing or phase interleaving. |
| Switching Frequency | 2.1MHz fixed - enables use of sub-1µH inductors and compact ceramic output capacitors while avoiding AM band interference. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules such as telematics and ADAS sensors. |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable power delivery to precision analog and digital loads without post-regulation. |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + 0.36V, critical for 12V-to-5V or 24V-to-12V dropout scenarios. |
| Thermal Range | −40°C to +125°C ambient - qualified for under-hood and industrial control cabinet deployment. |
Pinout & Package
MAX26406AFOAY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (PGND-connected), symmetrical SUP/PGND layout for optimal EMI suppression, and pin-compatible footprint across the MAX26404/MAX26405/MAX26406 family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | High-voltage enable input | Logic-compatible with 3V–36V supply rails; pulls device into ultra-low-IQ shutdown (4μA) when low. |
| 2 BST | Bootstrap supply for high-side gate driver | Requires 0.1μF ceramic capacitor between BST and LX to sustain high-side FET conduction during 99% duty cycle. |
| 3,9 SUP | Main IC power input | Dual-input configuration reduces high-frequency input ripple and improves EMI; requires parallel 1μF + 4.7μF ceramic decoupling. |
| 4,5,7,8 PGND | Power ground return | Four dedicated pins minimize ground impedance and thermal resistance; must be connected to thermal pad and system PGND plane. |
| 6 LX | Switch node | Connects to inductor switch node; high dv/dt path requiring tight layout and minimized loop area for EMI control. |
| 10 GND | Analog ground reference | Separate from PGND to isolate noise-sensitive feedback and error amplifier circuitry. |
| 11 BIAS | 1.8V internal bias supply output | Provides regulated power to internal logic; requires ≥2.2μF ceramic capacitor to PGND for stability and transient response. |
| 12 FB | Feedback voltage sense | Accepts resistor-divider for 0.8V–10V adjustable output or connects directly to BIAS for fixed 3.3V/5.0V operation. |
| 13 OUT | Output voltage sense | Direct connection to buck output rail enables accurate remote sensing and PGOOD monitoring independent of FB divider. |
| 14 VEA | Voltage-error amplifier output / current-error amplifier input | Enables precise dynamic current sharing in dual-phase configurations; must be connected between controller and target ICs. |
| 15 PGOOD | Open-drain power-good indicator | Asserts after soft-start and VOUT reaches 92–96% of target; requires external pull-up for system reset sequencing. |
| 16 SYNC | Mode selection and synchronization input | Pull to GND for skip mode; pull to BIAS for forced-PWM; accepts external clock up to 2.6MHz for synchronized multi-rail systems. |
| 17 SYNCOUT | 180° out-of-phase clock output | Active only in FPWM mode; used to drive second phase in dual-phase configuration; open for single-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop, symmetrical layout with split VIN/PGND pins reduces radiated EMI by >30dB vs conventional buck ICs. |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz (or 400kHz) lowers peak EMI emissions without affecting regulation or efficiency. |
| Dual-phase capability | VEA pin enables <±3% current sharing accuracy between two MAX26406AFOAY+ ICs in 12A total output configurations. |
| Low-IQ skip mode | 10μA quiescent current at no load preserves battery runtime in always-on automotive ECUs and IoT edge nodes. |
| Robust protection suite | Includes hiccup-mode short-circuit response, thermal shutdown at 165°C with 20°C hysteresis, and overvoltage lockout. |
Applications
| Automotive ADAS Camera Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers image sensor, ISP, and interface circuitry in rear-view and surround-view camera modules operating from 12V battery with cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with PGOOD sequencing, 99% dropout support, and EMI compliance for CISPR-25 Class 5. Use Value: Eliminates need for pre-regulator stages; 2.1MHz switching avoids AM radio band; Silent Switcher layout meets stringent automotive EMI limits without shielding. |
Use Scenario: Supplies 5V to isolated digital I/O channels and microcontroller peripherals in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-reliability DC-DC stage converting 24V industrial bus to clean 5V rail with -40°C to +125°C operation and overtemperature protection. Use Value: 36V max input withstands 24V bus surges; 10μA IQ reduces standby power in unpowered slots; FC2QFN package enables compact, convection-cooled PCB layout. |
| Telecom Remote Radio Unit | Medical Patient Monitor Auxiliary Rail |
|
Use Scenario: Generates 3.3V for FPGA configuration, SerDes, and RF front-end bias in outdoor 4G/5G small-cell base stations powered from 48V PoE or DC plant. IC Role / Device Role / Timing Role: Secondary buck stage stepping 12V intermediate rail to low-noise 3.3V; synchronized via SYNC to avoid beat frequencies with other converters. Use Value: 2.1MHz fixed frequency allows tight filtering; spread spectrum minimizes narrowband emissions near sensitive RF receivers; dual-phase option scales to 12A for higher-density RU designs. |
Use Scenario: Provides isolated 5V auxiliary power to touch-screen controller, USB interface, and data logging subsystem in portable patient monitors. IC Role / Device Role / Timing Role: Low-EMI, low-noise buck regulator meeting IEC 60601-1 EMC requirements; PGOOD enables safe boot sequencing before clinical measurement activation. Use Value: 10μA IQ extends battery life during transport mode; ±1% output accuracy ensures consistent touchscreen calibration; thermal shutdown prevents overheating in sealed enclosures. |
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 uses peak-current-mode control and lacks spread-spectrum or VEA-based dual-phase sharing. | Qualified for automotive AEC-Q100 Grade 1; supports smaller 2.2μH inductor but exhibits higher EMI without integrated Silent Switcher layout. | Select LM61460QWRNXTQ1 when cost sensitivity outweighs EMI performance and dual-phase scalability is not required. |
| MPQ4436AGL-A | 36V input, 6A, 500kHz–2.2MHz adjustable frequency, no spread-spectrum, no VEA pin, and only 1% output accuracy in PWM mode (not skip mode). | Offers adjustable frequency and external compensation but lacks PGOOD accuracy spec, thermal hysteresis, and automotive qualification. | Choose MPQ4436AGL-A for non-automotive industrial applications where board-level EMI filtering is acceptable and dual-phase operation is unnecessary. |
Compared with LM61460QWRNXTQ1 and MPQ4436AGL-A, the MAX26406AFOAY+ delivers superior EMI performance via integrated Silent Switcher layout and spread-spectrum, tighter light-load regulation accuracy, and unique VEA-based dual-phase current sharing - making it the preferred choice for space-constrained, high-reliability automotive and medical designs demanding minimal external components and certified EMC behavior.
Availability
MAX26406AFOAY+ is available at Aetrix Electronics and suitable for automotive ADAS, industrial PLCs, telecom remote radio units, and medical patient monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26406AFOAY+ 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 MAX26406AFOAY+ belongs to the MAX264xx Silent Switcher® buck converter family, engineered specifically for high-current, low-EMI power conversion in automotive and industrial environments where board space, thermal constraints, and regulatory EMC compliance are critical.
FAQ
What is the maximum continuous output current supported by the MAX26406AFOAY+?
The MAX26406AFOAY+ is rated for 6A continuous output current under typical thermal conditions (TA = +70°C, 4-layer board). This rating assumes proper PCB layout with thermal vias to the internal PGND pad and adequate copper area. Derating applies above +70°C ambient, with junction temperature limited to +150°C per absolute maximum ratings. The MAX26406AFOAY+ achieves this with integrated 45mΩ/22mΩ MOSFETs and 3.5mm × 3.75mm FC2QFN thermal design.
Does the MAX26406AFOAY+ support both fixed and adjustable output voltages?
Yes, the MAX26406AFOAY+ supports both configurations. For fixed outputs, connect the FB pin directly to the BIAS pin to select factory-programmed 3.3V or 5.0V. For adjustable outputs from 0.8V to 10V, use an external resistor-divider between OUT, FB, and GND - with RFB2 ≤ 100kΩ and RFB1 calculated using VFB = 0.800V. The MAX26406AFOAY+ maintains ±1% accuracy in FPWM mode regardless of configuration.
How does the MAX26406AFOAY+ achieve low EMI performance?
The MAX26406AFOAY+ achieves low EMI through three integrated features: (1) Silent Switcher® architecture with symmetrical, split VIN/PGND pin layout minimizing magnetic field coupling; (2) spread-spectrum frequency modulation (±3% around 2.1MHz) reducing peak radiated emissions; and (3) internal average current-mode control with fixed slope compensation improving noise immunity. These features eliminate the need for external EMI filters in most automotive and industrial applications compliant with CISPR-25 or EN55032.
Can the MAX26406AFOAY+ operate in dual-phase configuration, and what is required?
Yes, the MAX26406AFOAY+ supports dual-phase operation for up to 12A total output. It requires one controller IC (SYNC pulled high) and one target IC (SYNC pulled low or floating), with VEA pins connected between them for dynamic current sharing. The controller's SYNCOUT drives the target's SYNC input 180° out-of-phase. Both ICs must use identical output voltage settings, and FB pins must remain isolated. This configuration is validated for <±3% current mismatch across load and temperature.
What protection features are built into the MAX26406AFOAY+?
The MAX26406AFOAY+ includes overtemperature shutdown at +165°C (with 20°C hysteresis), hiccup-mode short-circuit protection that disables output for 25ms upon hard short detection, input undervoltage lockout (2.945V rising, 2.655V falling), BIAS UVLO (1.58V threshold), and robust ESD protection (±2kV HBM). All protections are fully integrated - no external components needed - and operate across the full −40°C to +125°C ambient range specified for the MAX26406AFOAY+.
MAX26406AFOAY+ 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:
- 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+ FAQ
1.How can I place an order for MAX26406AFOAY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26406AFOAY+ 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+ reliable?
The price and inventory of MAX26406AFOAY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26406AFOAY+ is usually 5 days.
3.What payment methods are accepted for MAX26406AFOAY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26406AFOAY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26406AFOAY+?
MAX26406AFOAY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26406AFOAY+ 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+?
For technical support, including MAX26406AFOAY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26406AFOAY+ requirements.
6.How does Aetrix verify that MAX26406AFOAY+ is sourced from the original manufacturer or authorized distributors?
All MAX26406AFOAY+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX26406AFOAY+?
All MAX26406AFOAY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26406AFOAY+, 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+ part is unused and in its original packaging.
Return procedure for MAX26406AFOAY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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