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Analog Devices Inc./Maxim Integrated MAX26406AFOCY+T
- Part No.:
- MAX26406AFOCY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26406AFOCY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,262
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Product details
Overview
MAX26406AFOCY+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 MAX26406AFOCY+T datasheet, MAX26406AFOCY+T pinout, MAX26406AFOCY+T application, or MAX26406AFOCY+T equivalent, key selection criteria include its FC2QFN-17 package thermal performance (θJA = 28.9°C/W on EV kit), dual-phase VEA-based current sharing, spread-spectrum EMI reduction, and ±1% output accuracy in FPWM mode at no load.
Technical Context
This device implements average current-mode control with internal slope compensation and a 33ns minimum on-time, enabling stable operation across wide VIN/VOUT ratios without subharmonic oscillation. Its MAXQ® power architecture delivers precise transient response and high phase margin via an integrated voltage-error amplifier (VEA) and symmetrical layout optimized for low EMI.
The IC supports dual-phase operation through SYNCOUT (180° out-of-phase clock) and VEA pin coupling, enabling dynamic current sharing between controller and target ICs. Forced-PWM and skip-mode operation are selected via the SYNC pin, while PGOOD provides accurate output voltage monitoring with 92–96% rising threshold and 100μs debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery (12V/24V) and industrial DC bus without pre-regulation |
| Output Current | 6A continuous - rated for sustained high-current loads in compact PCB space |
| Switching Frequency | 2.1MHz (or 400kHz) - enables use of sub-1μH inductors and <10μF ceramic output capacitors |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules |
| Output Accuracy | ±1% in FPWM mode at no load - ensures reliable logic-level supply for microcontrollers and sensors |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + 0.36V, critical for cold-crank automotive conditions |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor heatsinking |
Pinout & Package
MAX26406AFOCY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (PGND-connected) and symmetrical SUP/PGND pin arrangement for optimal EMI suppression and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage compatible (up to 42V); pulls device into shutdown (4μA IQ) when low |
| BST | Bootstrap supply | Requires 0.1μF capacitor to LX; powers high-side gate driver for efficient 100% duty-cycle operation |
| SUP | Main power input | Dual pins (3,9) reduce IR drop and improve high-frequency decoupling; accepts 3–36V |
| PGND | Power ground | Four dedicated pins (4,5,7,8) minimize ground bounce and enhance thermal conduction |
| LX | Switch node | Connects to inductor; supports 6A RMS current; requires tight layout to minimize EMI |
| GND | Analog ground | Separate from PGND to isolate noise-sensitive feedback and error amplifier circuitry |
| BIAS | Internal 1.8V LDO output | Powers internal logic; requires ≥2.2μF ceramic cap to PGND; auto-switches source from VIN to VOUT |
| FB | Feedback input | Connect to BIAS for fixed 3.3V/5V; or external resistor divider for 0.8–10V adjustment |
| OUT | Output sense | Direct connection to regulated output rail; used with FB for remote sensing in high-current layouts |
| VEA | Voltage-error amplifier I/O | Controller output / target input; enables precise current sharing in dual-phase configurations |
| PGOOD | Open-drain power-good | Active-low signal with 92–96% VOUT threshold; requires external pull-up for system sequencing |
| SYNC | Mode select & sync input | Pull to GND → skip mode; pull to BIAS → FPWM; accept external clock up to 2.6MHz |
| SYNCOUT | 180° out-of-phase clock | Drives second phase in dual configuration; disabled in skip mode; no external load required |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters via balanced hot-loop layout and integrated bypass caps |
| Spread-spectrum modulation | ±3% frequency dither centered at fSW - lowers peak EMI emissions without affecting loop stability |
| Dual-phase capability | Enables 12A output using two MAX26406AFOCY+T devices with <±3% current mismatch under transients |
| 99% dropout operation | Maintains regulation during automotive cold-crank (VIN = 4.5V) with 5V output - eliminates need for boost pre-regulator |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and downstream circuitry during power-up |
Applications
| Automotive Infotainment Power | Industrial 24V Point-of-Load |
|---|---|
Use Scenario: Powering SoC, display controllers, and audio codecs in head units with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator with PGOOD sequencing and spread-spectrum EMI suppression. Use Value: Meets CISPR-25 Class 5 radiated emissions without shielding or ferrites, reducing BOM cost and board area. | Use Scenario: Generating 3.3V for PLC I/O modules powered from 24V industrial rail with wide temperature (-40°C to +125°C) requirements. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC stage with 99% dropout support for brownout resilience. Use Value: Delivers full 6A output at +125°C ambient using only PCB copper as heatsink - eliminates need for external thermal management. |
| Telecom Base Station Bias | Networking Equipment Core Supply |
Use Scenario: Providing clean, low-noise 5V bias for RF front-end amplifiers and ADCs in 4G/5G small cells. IC Role / Device Role / Timing Role: Low-EMI, high-PSRR buck converter operating in forced-PWM mode to avoid switching frequency interference. Use Value: Achieves <10mVpp output ripple at 2.1MHz with ceramic output caps - preserves SNR in sensitive analog signal chains. | Use Scenario: Supplying 1.2V/1.8V core rails for switch ASICs and PHYs in enterprise switches with dual-phase scalability. IC Role / Device Role / Timing Role: Dual-phase controller enabling 12A total output with matched current sharing via VEA coupling. Use Value: Enables single-chip solution for high-current FPGA/ASIC cores while maintaining <±2% load regulation across 0–100% step changes. |
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 input, 6A, 2.1MHz, but uses peak-current-mode control and lacks spread-spectrum or dual-phase VEA interface | Automotive AEC-Q100 Grade 1; same temp range but no built-in EMI optimization features | Choose when AEC-Q100 certification is mandatory and EMI filtering is handled externally |
| TPS546B24RVFT | 36V input, 10A, 500kHz–2.2MHz, PMBus-enabled, but larger 5mm × 5mm QFN-32 package and higher IQ (15μA) | Supports digital telemetry and adaptive loop tuning; targets data center and telecom with telemetry needs | Choose when digital monitoring, fault logging, or programmable soft-start are required |
Compared with LM61460QWRNXTQ1 and TPS546B24RVFT, the MAX26406AFOCY+T offers superior EMI performance via Silent Switcher layout and spread-spectrum, tighter dual-phase current sharing via analog VEA coupling, and lower no-load IQ - making it optimal for space-constrained, noise-sensitive, high-reliability applications where analog control precision outweighs digital configurability.
Availability
MAX26406AFOCY+T is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 24V PLCs, telecom base station bias supplies, and networking equipment core regulators requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26406AFOCY+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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The MAX26404/MAX26405/MAX26406 family was designed specifically for high-density, low-EMI DC-DC conversion in automotive and industrial environments where input voltage transients, thermal constraints, and electromagnetic compatibility are critical design factors.
FAQ
What is the maximum continuous output current supported by the MAX26406AFOCY+T?
The MAX26406AFOCY+T is rated for 6A continuous output current under typical thermal conditions (TA ≤ +125°C, 4-layer EV kit). This rating assumes proper PCB layout with adequate copper pour on PGND and thermal pad. Derating applies above +125°C ambient or with reduced airflow; the device enters thermal shutdown at 165°C junction temperature.
Does the MAX26406AFOCY+T support adjustable output voltages, and how is it configured?
Yes, the MAX26406AFOCY+T supports adjustable output voltages from 0.8V to 10V using an external resistor divider connected between OUT, FB, and GND. For fixed outputs (3.3V or 5.0V), connect FB directly to BIAS. The feedback regulation voltage is 0.800V ±1.6%, and RFB2 should be ≤100kΩ to minimize leakage error.
How does the MAX26406AFOCY+T achieve low EMI performance without external filters?
The MAX26406AFOCY+T achieves low EMI through its Silent Switcher® architecture: symmetrical hot-loop layout, integrated bootstrap and input bypass capacitors, and spread-spectrum frequency modulation (±3% around fSW). These features reduce peak radiated emissions by >30dB compared to conventional buck converters, eliminating need for ferrite beads or metal shielding in most applications.
Can the MAX26406AFOCY+T operate in dropout mode, and what is the minimum input voltage for 5V output?
Yes, the MAX26406AFOCY+T supports dropout operation up to 99% duty cycle. For a 5V output, the minimum input voltage is approximately 5.05V (5V ÷ 0.99), enabling regulation during automotive cold-crank events where battery voltage drops to ~4.5V - provided external components (inductor DCR, MOSFET RDS(on)) are selected to maintain efficiency.
What is the role of the VEA pin in dual-phase operation of the MAX26406AFOCY+T?
In dual-phase operation, the VEA pin serves as the voltage-error amplifier output on the controller IC and the current-error amplifier input on the target IC. Connecting controller VEA to target VEA enables dynamic current sharing with <±3% mismatch under load transients, ensuring balanced power delivery without external current-sense resistors or complex digital arbitration.
MAX26406AFOCY+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:
- 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+T FAQ
1.How can I place an order for MAX26406AFOCY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26406AFOCY+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 MAX26406AFOCY+T reliable?
The price and inventory of MAX26406AFOCY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26406AFOCY+T is usually 5 days.
3.What payment methods are accepted for MAX26406AFOCY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26406AFOCY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26406AFOCY+T?
MAX26406AFOCY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26406AFOCY+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 MAX26406AFOCY+T?
For technical support, including MAX26406AFOCY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26406AFOCY+T requirements.
6.How does Aetrix verify that MAX26406AFOCY+T is sourced from the original manufacturer or authorized distributors?
All MAX26406AFOCY+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 MAX26406AFOCY+T meets industry standards.
7.What is the process for return or replacement of MAX26406AFOCY+T?
All MAX26406AFOCY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26406AFOCY+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 MAX26406AFOCY+T part is unused and in its original packaging.
Return procedure for MAX26406AFOCY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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