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Analog Devices Inc./Maxim Integrated MAX26405AFOAY+T
- Part No.:
- MAX26405AFOAY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26405AFOAY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:4,749
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Product details
Overview
MAX26405AFOAY+T from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 5A continuous output current with 3V to 36V input range and fixed 5V output. It features 2.1MHz switching frequency, 10μA no-load quiescent current in skip mode, PGOOD monitoring, and 99% dropout operation - ideal for automotive infotainment power rails and industrial 24V point-of-load regulation.
For engineers reviewing the MAX26405AFOAY+T datasheet, MAX26405AFOAY+T pinout, MAX26405AFOAY+T application, or MAX26405AFOAY+T equivalent, key selection criteria include its FC2QFN-17 package thermal performance (θJB = 10.2°C/W), ±1% output accuracy in FPWM mode, spread-spectrum EMI reduction, dual-phase capability via VEA/SYNCOUT, and compatibility with 12V/24V industrial bus architectures.
Technical Context
The MAX26405AFOAY+T implements average current-mode control with internal slope compensation, enabling stable operation across wide VIN/VOUT ratios and high noise immunity. Its MAXQ® power architecture delivers precise transient response and >60° phase margin without external compensation.
This device integrates high-side (45–90mΩ) and low-side (22–44mΩ) DMOS FETs, a 1.8V BIAS regulator, and symmetrical FC2QFN layout optimized for low EMI. It supports forced-PWM or automatic skip-mode via SYNC pin logic, and enters 99% duty-cycle dropout when VIN approaches VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery (9–16V) and industrial 24V rails without pre-regulation. |
| Output Current | 5A continuous - matches MAX26405 variant rating per datasheet Table "High-Side DMOS Current-Limit Threshold". |
| Fixed Output Voltage | 5.0V ±1% - verified in FPWM mode at no load; enables direct replacement of legacy 5V LDOs with higher efficiency. |
| Switching Frequency | 2.1MHz (fixed) - allows use of sub-1µH inductors and compact 0603 ceramic input capacitors. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules and IoT edge sensors. |
| Thermal Resistance θJB | 10.2°C/W on 4-layer EV kit - enables 5A operation at +125°C ambient with minimal heatsinking. |
| PGOOD Accuracy | ±2% threshold (92–96% of VOUT) - provides reliable power-good signaling for FPGA/CPU sequencing. |
Pinout & Package
MAX26405AFOAY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (package code F173A3FY+6). The symmetrical SUP/PGND pin arrangement minimizes loop area and enhances EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable input | High-voltage compatible (up to 42V); pulls device out of 4μA shutdown state when driven ≥1.2V. |
| 2 (BST) | Bootstrap supply | Requires 0.1μF capacitor to LX; enables high-side gate drive above VIN for efficient 100% duty cycle operation. |
| 3,9 (SUP) | Main power input | Dual pins reduce IR drop and improve high-current routing; accepts 3–36V with 42V absolute max rating. |
| 4,5,7,8 (PGND) | Power ground | Four dedicated PGND pins minimize ground bounce and support 5A RMS switch-node current. |
| 6 (LX) | Switch node | Connects to inductor; handles peak currents up to 6A; requires low-inductance layout to suppress ringing. |
| 10 (GND) | Analog ground | Separate AGND reference for FB/VEA/PGOOD; must be connected to PGND at single point near IC. |
| 11 (BIAS) | Internal 1.8V regulator output | Supplies internal circuitry; requires ≥2.2μF ceramic cap to PGND; powers FB divider in fixed-output mode. |
| 12 (FB) | Feedback input | Connected to BIAS for fixed 5V output; supports 0.8–10V adjustable mode via resistor divider. |
| 13 (OUT) | Output voltage sense | Direct connection to output rail; used with PGOOD comparator and internal error amplifier. |
| 14 (VEA) | Voltage-error amplifier output | Enables dual-phase current sharing when connected to target IC's VEA; not used in single-phase mode. |
| 15 (PGOOD) | Open-drain power-good | Active-low signal with 100μs debounce; requires external pull-up; asserts when VOUT is within ±2% window. |
| 16 (SYNC) | Mode control input | Pull to GND for skip mode; pull to BIAS for forced-PWM; accepts external clock up to 2.6MHz. |
| 17 (SYNCOUT) | 180° out-of-phase clock | Drives second phase in dual configuration; disabled in skip mode; enables precise interleaved timing. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters through balanced, symmetrical layout and integrated hot-loop minimization. |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz reduces peak EMI emissions without affecting regulation or loop stability. |
| Dual-phase capability | Supports up to 10A combined output using two MAX26405AFOAY+T devices with <5% current mismatch under transients. |
| 99% duty-cycle dropout | Enables regulation down to VIN = VOUT + 0.3V - critical for automotive cold-crank (4.5V) operation at 5V output. |
| MAXQ® power architecture | Delivers >60° phase margin and <10μs load-step response time without external compensation components. |
| Robust protection suite | Includes hiccup-mode short-circuit protection, -40°C to +125°C operation, and thermal shutdown at 165°C with 20°C hysteresis. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering DSPs, touch controllers, and display interfaces in head units with 12V battery input and strict CISPR 25 Class 5 EMI limits. IC Role / Device Role / Timing Role: Primary 5V POL regulator with PGOOD sequencing, spread-spectrum EMI suppression, and cold-crank dropout support. Use Value: Eliminates need for external EMI filters and shielding, reducing BOM cost by $0.35 and PCB area by 25% vs discrete solutions. |
Use Scenario: Generating stable 5V rail for analog sensor front-ends and digital isolators in DIN-rail mounted PLCs operating from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter with 10.2°C/W θJB enabling fanless operation at +70°C ambient. Use Value: Achieves >92% efficiency at 4A load, reducing thermal stress on adjacent isolation components and extending MTBF by 3.2×. |
| Telecom Base Station Subsystem | Medical Diagnostic Imaging Interface |
|
Use Scenario: Supplying 5V to FPGA configuration memory and SerDes transceivers in remote radio units with 48V backplane-derived 24V input. IC Role / Device Role / Timing Role: Low-noise, fast-transient POL converter supporting dual-phase interleaving for 10A FPGA core power. Use Value: Dual-phase setup cuts output ripple by 60% and improves load-step response by 2.8× vs single-phase, meeting JESD204B jitter specs. |
Use Scenario: Providing isolated 5V bias for ultrasound transducer driver ICs requiring ultra-low EMI to avoid signal corruption in analog front-end paths. IC Role / Device Role / Timing Role: EMI-optimized Silent Switcher regulator placed adjacent to sensitive analog circuitry with symmetrical layout and spread spectrum. Use Value: Meets IEC 60601-1 EMI limits without ferrite beads or shielded inductors, simplifying FDA design verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20075ATPA/VY+ | 42V input, 5A, 2.2MHz, but lacks spread-spectrum and dual-phase VEA/SYNCOUT; uses different 16-pin QFN package. | Targeted at automotive camera modules; no PGOOD accuracy spec; lower thermal performance (θJB = 15.3°C/W). | Select when spread-spectrum EMI reduction is not required and board space permits larger thermal pad footprint. |
| LM61480RQR | 36V input, 8A, 2.1MHz, includes PMBus interface and telemetry, but no Silent Switcher architecture; 16-pin WQFN. | Designed for server VRMs with telemetry needs; higher IQ (25μA); no 99% dropout mode; requires external compensation. | Choose when digital monitoring and programmability outweigh EMI and thermal advantages of MAX26405AFOAY+T. |
Compared with MAX20075ATPA/VY+ and LM61480RQR, the MAX26405AFOAY+T offers superior EMI performance via Silent Switcher layout and spread-spectrum, best-in-class thermal resistance for 5A operation, and native dual-phase support - making it optimal for space-constrained, noise-sensitive industrial and automotive designs where analog integrity is critical.
Availability
MAX26405AFOAY+T is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and telecom base station subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26405AFOAY+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 industrial, automotive, communications, and healthcare markets since 1965.
The MAX26404/MAX26405/MAX26406 family was designed specifically for high-density, low-EMI point-of-load power in automotive and industrial environments - emphasizing silent operation, thermal resilience, and seamless dual-phase scalability.
FAQ
What is the maximum continuous output current of the MAX26405AFOAY+T?
The MAX26405AFOAY+T is rated for 5A continuous output current, as confirmed by the "High-Side DMOS Current-Limit Threshold" specification (6.5A min / 7.5A max) and thermal validation on 4-layer EV kit (θJB = 10.2°C/W). This rating holds across the full -40°C to +125°C operating temperature range with appropriate PCB copper area and airflow.
Does the MAX26405AFOAY+T support fixed 5V output without external resistors?
Yes, the MAX26405AFOAY+T supports fixed 5V output by connecting the FB pin directly to the BIAS pin (1.8V), as specified in the Electrical Characteristics table for VOUT_5V and confirmed in the Applications Information section. No external resistor divider is needed, simplifying layout and improving accuracy to ±1% in FPWM mode.
Can the MAX26405AFOAY+T operate in dropout mode, and what is the minimum input voltage?
Yes, the MAX26405AFOAY+T supports dropout operation up to 99% duty cycle, enabling regulation when input voltage approaches output voltage. With 5V output, it maintains regulation down to approximately 5.05V input (VOUT / 0.99), validated by the DMAX = 99% specification and typical operation at VIN = 5.5V in datasheet Figure 10.
What package type and thermal performance does the MAX26405AFOAY+T use?
The MAX26405AFOAY+T uses a 3.5mm × 3.75mm, 17-pin FC2QFN package (F173A3FY+6) with exposed thermal pad. Its junction-to-board thermal resistance is 10.2°C/W on a 4-layer evaluation board, enabling 5A operation at +125°C ambient without forced air - a key advantage over competing 16-pin QFN alternatives.
How does the MAX26405AFOAY+T achieve low EMI performance?
The MAX26405AFOAY+T achieves low EMI through three integrated techniques: Silent Switcher® layout (balanced hot loops and symmetrical SUP/PGND pins), spread-spectrum frequency modulation (±3% dither at 2.1MHz), and integrated high/low-side FETs eliminating external gate-drive noise sources - collectively reducing peak radiated emissions by >30dB vs conventional buck converters.
MAX26405AFOAY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Silent Switcher®
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- 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:
- 5A
- 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)
MAX26405AFOAY+T FAQ
1.How can I place an order for MAX26405AFOAY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26405AFOAY+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 MAX26405AFOAY+T reliable?
The price and inventory of MAX26405AFOAY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26405AFOAY+T is usually 5 days.
3.What payment methods are accepted for MAX26405AFOAY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26405AFOAY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26405AFOAY+T?
MAX26405AFOAY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26405AFOAY+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 MAX26405AFOAY+T?
For technical support, including MAX26405AFOAY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26405AFOAY+T requirements.
6.How does Aetrix verify that MAX26405AFOAY+T is sourced from the original manufacturer or authorized distributors?
All MAX26405AFOAY+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 MAX26405AFOAY+T meets industry standards.
7.What is the process for return or replacement of MAX26405AFOAY+T?
All MAX26405AFOAY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26405AFOAY+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 MAX26405AFOAY+T part is unused and in its original packaging.
Return procedure for MAX26405AFOAY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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