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Analog Devices Inc./Maxim Integrated MAX26406AFOBY+
- Part No.:
- MAX26406AFOBY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26406AFOBY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:4,979
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Product details
Overview
MAX26406AFOBY+ from Analog Devices is a fully integrated 36V-input, 6A-output synchronous buck converter with Silent Switcher® architecture, integrated high-side and low-side MOSFETs, fixed 2.1MHz switching frequency, ±1% output voltage accuracy in FPWM mode, and PGOOD monitoring - designed for automotive and industrial point-of-load power supplies requiring low EMI and dropout operation down to 99% duty cycle.
For engineers reviewing the MAX26406AFOBY+ datasheet, MAX26406AFOBY+ pinout, MAX26406AFOBY+ application, or MAX26406AFOBY+ equivalent, key selection considerations include its 3.5mm × 3.75mm 17-pin FC2QFN package, dual-phase capability via VEA/SYNCOUT, spread-spectrum EMI reduction, 10μA no-load quiescent current in skip mode, and programmable 0.8V–10V or fixed 3.3V/5V output configurations.
Technical Context
The MAX26406AFOBY+ implements average current-mode control with a 33ns minimum on-time, enabling large step-down ratios without pulse skipping. Its MAXQ® power architecture delivers precise transient response and phase margin optimization for stable high-current regulation.
It supports forced-PWM or automatic skip-mode operation via SYNC pin logic, features internal 2.5ms soft-start, 99% dropout duty cycle, and integrated thermal shutdown (165°C) with 20°C hysteresis. Dual-phase operation is enabled by 180° out-of-phase SYNCOUT and shared VEA for dynamic current sharing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports wide automotive battery transients and industrial 12V/24V rails without external pre-regulation. |
| Output Current | 6A continuous - enables single-chip solutions for high-power PoL applications up to ~30W at 5V. |
| Switching Frequency | Fixed 2.1MHz - allows use of sub-1μH inductors and compact ceramic output capacitors; avoids AM band interference. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules and low-power industrial sensors. |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable power delivery to precision analog or digital loads without post-regulation. |
| Thermal Protection | 165°C shutdown with 20°C hysteresis - prevents thermal runaway during sustained overload or poor PCB heatsinking. |
| Package | 3.5mm × 3.75mm, 17-pin FC2QFN - provides low θJB (10.2°C/W) and symmetrical layout for superior EMI performance. |
Pinout & Package
MAX26406AFOBY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (PGND-connected), optimized for low-inductance layout and EMI suppression via symmetrical VIN/PGND pin arrangement.
| 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 reliably. |
| SUP | Main supply input | Accepts 3V–36V input; requires parallel 1μF + 4.7μF ceramic/low-ESR caps for stability and EMI filtering. |
| PGND | Power ground | Pins 4,5,7,8 are dedicated high-current PGND returns; must be tied directly to thermal pad and input/output caps. |
| LX | Switch node | Connects to inductor switch node; carries high di/dt; requires short, low-inductance trace to minimize EMI. |
| GND | Analog ground | Separate AGND reference for feedback and error amplifier; isolated from PGND except at single-point star ground. |
| BIAS | Internal LDO output | 1.8V regulated supply for internal circuitry; requires ≥2.2μF ceramic cap to PGND for startup stability. |
| FB | Feedback input | 0.8V reference pin; connect to BIAS for fixed 3.3V/5V outputs, or resistor-divider for 0.8V–10V adjustment. |
| OUT | Output sense | Direct connection to regulated output rail; used with FB for accurate remote sensing and ripple rejection. |
| VEA | Voltage-error amplifier I/O | Controller output / target input for dual-phase current sharing; must be connected between ICs for balanced load division. |
| PGOOD | Power-good indicator | Open-drain output asserting when VOUT is within ±6% of target; requires external pull-up for system reset sequencing. |
| SYNC | Mode control | Pull to GND for skip mode (low IQ), to BIAS for FPWM (fixed frequency), or to external clock for synchronization. |
| SYNCOUT | Multiphase clock | 180° out-of-phase clock output for dual-phase operation; inactive in skip mode; must be left open for single-phase use. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters through integrated dual-loop layout and symmetrical pinout. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1MHz or 400kHz - lowers peak EMI emissions without affecting regulation performance. |
| Dual-phase capability | Enables up to 12A output using two MAX26406AFOBY+ ICs with <±3% current mismatch under transient load steps. |
| 99% dropout operation | Supports VOUT ≥ 0.99 × VSUP - critical for automotive cold-crank (4.5V in) delivering 4.3V to microcontrollers. |
| Integrated protection suite | Includes overtemperature shutdown, hiccup-mode short-circuit protection, and input UVLO with hysteresis for robust field operation. |
Applications
| Automotive ADAS Camera Module | Industrial PLC I/O Power Rail |
|---|---|
Use Scenario: Powering image sensor, ISP, and interface logic in rear-view or surround-view camera systems exposed to -40°C to +105°C ambient and 4.5V–16V battery input. IC Role / Device Role / Timing Role: Primary 5V/3.3V PoL regulator delivering clean, low-noise power with PGOOD sequencing for safe boot and fault reporting. Use Value: 10μA skip-mode IQ extends standby time; 99% duty cycle maintains output during cold-crank; Silent Switcher meets CISPR-25 Class 5 EMI limits. | Use Scenario: Generating isolated 3.3V/5V rails for digital I/O expansion modules in factory automation controllers operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: High-reliability DC-DC converter supplying FPGA configuration, level-shifting buffers, and communication PHYs. Use Value: ±1% output accuracy ensures logic-level compatibility; thermal shutdown protects against enclosure overheating; FC2QFN package enables compact 2-layer PCB layout. |
| Telecom Remote Radio Unit (RRU) | Medical Point-of-Care Analyzer |
Use Scenario: Providing 5V bias to RF front-end components and 3.3V to baseband processors in outdoor 5G small cells with 24V/48V backplane input. IC Role / Device Role / Timing Role: Synchronous buck stage in multi-rail power tree, synchronized via SYNC to avoid beat frequencies with other converters. Use Value: 2.1MHz fixed frequency minimizes filter size; spread spectrum reduces conducted EMI coupling into sensitive RF paths; dual-phase option scales to 12A for higher-density RU designs. | Use Scenario: Powering microcontroller, ADC, and display subsystems in portable diagnostic devices requiring long battery life and clinical-grade reliability. IC Role / Device Role / Timing Role: Main system regulator converting primary Li-ion battery (3.0V–4.2V) or USB input to stable 3.3V with precise brownout detection. Use Value: 3V–36V input range accommodates both battery and wall-adapter operation; PGOOD enables controlled shutdown before battery depletion; low EMI prevents interference with analog sensor signals. |
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 | 42V max input, 6A, 2.1MHz, but lacks spread-spectrum and dual-phase VEA/SYNCOUT support. | Automotive AEC-Q100 Grade 1 qualified; better for safety-critical ASIL-B systems where qualification is mandatory. | Select LM61460QWRNXTQ1 when AEC-Q100 compliance is required and dual-phase scaling is unnecessary. |
| MPQ4436AGL-A | 36V, 6A, 2.1MHz, no spread-spectrum, no dual-phase capability, lower accuracy (±2%) and higher IQ (25μA). | Cost-optimized for consumer and industrial non-automotive applications; smaller 3mm × 4mm QFN package. | Select MPQ4436AGL-A when budget constraints dominate and EMI/thermal performance margins allow relaxed specs. |
Compared with LM61460QWRNXTQ1 and MPQ4436AGL-A, the MAX26406AFOBY+ uniquely combines spread-spectrum EMI reduction, dual-phase current sharing via VEA, and 10μA skip-mode IQ - making it optimal for space-constrained, noise-sensitive automotive and industrial designs where board-level EMI filtering must be minimized.
Availability
MAX26406AFOBY+ is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLC power rails, telecom RRU subsystems, and medical point-of-care analyzers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26406AFOBY+ 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 MAX26406AFOBY+ belongs to the MAX264xx Silent Switcher® buck converter family, engineered specifically for low-EMI, high-efficiency point-of-load power delivery in automotive and harsh-environment industrial systems where board space, thermal headroom, and regulatory EMI compliance are critical.
FAQ
What is the maximum output current supported by the MAX26406AFOBY+?
The MAX26406AFOBY+ delivers up to 6A continuous output current under typical thermal conditions (TA = +70°C, 4-layer board). Its current-limit threshold is specified at 7.5A to 10A (min to max), ensuring robust overload protection while maintaining regulation across the full 3V–36V input range. Derating applies above +70°C ambient per the θJA = 28.9°C/W spec.
Does the MAX26406AFOBY+ support adjustable output voltage?
Yes, the MAX26406AFOBY+ supports both fixed and adjustable outputs. Connect FB to BIAS for factory-set 3.3V or 5.0V outputs. For custom voltages from 0.8V to 10V, use an external resistor-divider from OUT to GND with FB tied to the divider junction - the feedback reference is 0.800V ±13mV, enabling precise regulation across the full range.
How does the MAX26406AFOBY+ achieve low EMI performance?
The MAX26406AFOBY+ achieves low EMI through three integrated techniques: (1) Silent Switcher® architecture with on-die, tightly coupled hot-loop capacitors; (2) symmetrical 17-pin FC2QFN package that balances high-di/dt return paths; and (3) optional spread-spectrum modulation (±3% around 2.1MHz) that spreads energy across a wider bandwidth, reducing peak radiated emissions by up to 10dB.
Can the MAX26406AFOBY+ operate in dropout mode?
Yes, the MAX26406AFOBY+ operates in dropout mode with up to 99% duty cycle, allowing VOUT to remain regulated even when VSUP drops close to VOUT (e.g., 4.5V input → 4.3V output). This behavior is enabled automatically during low-VIN conditions and is critical for automotive cold-crank operation where input may dip below 5V while maintaining microcontroller supply integrity.
What is the purpose of the VEA pin on the MAX26406AFOBY+?
The VEA pin on the MAX26406AFOBY+ serves as the voltage-error amplifier output in controller mode and the current-error amplifier input in target mode for dual-phase operation. When two MAX26406AFOBY+ ICs are configured in dual-phase, connecting their VEA pins ensures dynamic current sharing accuracy better than ±3% under load transients - eliminating need for external current-sense resistors or complex master-slave timing circuits.
MAX26406AFOBY+ 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):
- 3.3V
- 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)
MAX26406AFOBY+ FAQ
1.How can I place an order for MAX26406AFOBY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26406AFOBY+ 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 MAX26406AFOBY+ reliable?
The price and inventory of MAX26406AFOBY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26406AFOBY+ is usually 5 days.
3.What payment methods are accepted for MAX26406AFOBY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26406AFOBY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26406AFOBY+?
MAX26406AFOBY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26406AFOBY+ 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 MAX26406AFOBY+?
For technical support, including MAX26406AFOBY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26406AFOBY+ requirements.
6.How does Aetrix verify that MAX26406AFOBY+ is sourced from the original manufacturer or authorized distributors?
All MAX26406AFOBY+ 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 MAX26406AFOBY+ meets industry standards.
7.What is the process for return or replacement of MAX26406AFOBY+?
All MAX26406AFOBY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26406AFOBY+, 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 MAX26406AFOBY+ part is unused and in its original packaging.
Return procedure for MAX26406AFOBY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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