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Analog Devices Inc./Maxim Integrated MAX26405AFOAY+
- Part No.:
- MAX26405AFOAY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26405AFOAY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX26405AFOAY+ 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 - designed for automotive infotainment power rails and industrial 24V point-of-load systems.
For engineers reviewing the MAX26405AFOAY+ datasheet, MAX26405AFOAY+ pinout, MAX26405AFOAY+ application, or MAX26405AFOAY+ 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 VEA-based current sharing, and compatibility with 12V/24V industrial supply buses requiring stable low-noise regulation.
Technical Context
The MAX26405AFOAY+ implements average current-mode control with internal slope compensation, enabling robust noise immunity and precise dynamic current sharing in dual-phase configurations. Its architecture integrates high-side (45mΩ typ) and low-side (22mΩ typ) DMOS switches, a 1.8V BIAS regulator, and a 2.5ms fixed soft-start ramp.
It supports forced-PWM or automatic skip-mode via SYNC pin logic, delivers PGOOD with 94% VOUT threshold and 100μs debounce, and operates across –40°C to +125°C ambient with thermal shutdown at 165°C and 20°C hysteresis. The device uses symmetrical FC2QFN pinout for optimized EMI suppression and supports spread-spectrum modulation (±3% fSW) when not externally synchronized.
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 | 5A continuous - matches MAX26405 variant rating per datasheet Table "Electrical Characteristics" under ILIM condition. |
| 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 caps for space-constrained PCBs. |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on automotive modules during sleep states. |
| Duty Cycle Max | 99% - sustains regulation down to VIN = 5.05V, critical for cold-crank automotive scenarios. |
| Thermal Resistance θJB | 10.2°C/W (EV kit) - enables >4W dissipation at ΔT = 40°C with standard 4-layer board, supporting full 5A load at +85°C ambient. |
Pinout & Package
MAX26405AFOAY+ is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND). The symmetrical layout minimizes loop area and enhances EMI performance. Pin 1 (EN) enables high-voltage-compatible startup; pins 3/9 (SUP) and 4/5/7/8 (PGND) support parallel high-current paths; pin 14 (VEA) enables dual-phase current sharing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable Input | High-voltage compatible (up to 42V); pulls device out of 4μA shutdown state when >1.2V applied. |
| 2 BST | Bootstrap Supply | Connects 0.1μF capacitor between BST and LX to drive high-side FET gate above SUP rail. |
| 3,9 SUP | Main Power Input | Accepts 3V–36V; requires parallel 1μF + 4.7μF ceramic capacitors for low-impedance decoupling. |
| 4,5,7,8 PGND | Power Ground | Low-impedance return path for LX current; must be tied directly to thermal pad and input/output caps. |
| 6 LX | Switch Node | Connects to inductor switch node; carries high di/dt; requires tight layout to minimize EMI radiation. |
| 10 GND | Analog Ground | Reference for FB, VEA, PGOOD; isolated from PGND except at single-point star ground. |
| 11 BIAS | Internal 1.8V Regulator Output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND; supplies FB for fixed 5V operation. |
| 12 FB | Feedback Input | Connected to BIAS for fixed 5V output; open for adjustable mode using external resistor divider. |
| 13 OUT | Output Sense | Direct connection to regulated output; used with FB for remote sensing in high-current layouts. |
| 14 VEA | Voltage Error Amplifier I/O | Output in controller mode; input in target mode; connects to partner IC's VEA for matched current sharing. |
| 15 PGOOD | Open-Drain Power-Good | Asserts high when VOUT reaches 94% of target; requires external pull-up for system reset sequencing. |
| 16 SYNC | Mode Control | Pulled to BIAS for FPWM; pulled to GND for skip mode; 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; left open for single-phase use. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces radiated EMI by >20dB vs conventional buck converters through balanced hot-loop layout and integrated bypass caps. |
| Spread-Spectrum Modulation | ±3% frequency dither centered at 2.1MHz minimizes peak EMI emissions without affecting loop stability or transient response. |
| Dual-Phase Capability | VEA pin enables <1% current mismatch between phases under transients, supporting up to 10A total with two MAX26405AFOAY+ units. |
| Ultra-Low IQ Operation | 10μA no-load quiescent current in skip mode meets automotive OEM requirements for module sleep-state power budgets. |
| Robust Protection Suite | Includes overtemperature shutdown (165°C), hiccup-mode short-circuit protection, and 99% dropout operation for cold-crank resilience. |
Applications
| Automotive Infotainment Power Rail | Industrial 24V Point-of-Load |
|---|---|
Use Scenario: Powering DSPs, display controllers, and USB hubs in head-unit systems with wide battery voltage swings (6V–16V). IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing and cold-crank support down to 5.05V input. Use Value: Eliminates need for external pre-regulator; maintains 5V output during engine start with 99% duty cycle and <1% output error. |
Use Scenario: Generating clean 5V for PLC I/O modules and sensor interfaces in factory automation equipment. IC Role / Device Role / Timing Role: Compact, low-EMI DC-DC stage replacing discrete solutions on space-constrained DIN-rail mounted PCBs. Use Value: FC2QFN-17 package and 2.1MHz switching enable <1cm² solution size; spread spectrum meets CISPR-25 Class 5 limits. |
| Telecom Base Station Subsystem | Medical Diagnostic Imaging Interface |
Use Scenario: Providing isolated 5V bias for RF front-end amplifiers and ADC drivers in small-cell base stations. IC Role / Device Role / Timing Role: Secondary buck stage fed from 12V intermediate bus; synchronized to system clock via SYNC pin. Use Value: 2.1MHz fixed frequency avoids AM band interference; SYNCOUT enables dual-phase scaling for higher channel count designs. |
Use Scenario: Powering high-resolution touch-screen controllers and data acquisition ASICs in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-noise 5V supply with PGOOD monitoring for safety-critical power sequencing and fault reporting. Use Value: ±1% output accuracy ensures ADC reference stability; 10μA IQ extends battery life during standby without compromising wake-up latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX26404AFOAY+ | 4A rated output current; identical pinout, package, and feature set except lower ILIM threshold (6.25A typ vs 7.5A typ). | Suitable for lower-power 5V rails where 4A margin suffices; shares same PCB layout and firmware interface. | Select when full 5A load is not required and cost optimization is prioritized without sacrificing thermal or EMI performance. |
| MAX26406AFOAY+ | 6A rated output current; same 17-pin FC2QFN package and electrical interface but higher RDSON_HS (45→55mΩ typ) and ILIM (8.75A typ). | Required for future-proofing 5V rails with peak currents >5A; demands slightly higher thermal margin on PCB. | Choose when system-level load projections exceed 5A or when dual-phase redundancy mandates higher per-phase headroom. |
Compared with MAX26404AFOAY+, the MAX26405AFOAY+ provides 25% higher output current headroom while maintaining identical footprint and control logic; versus MAX26406AFOAY+, it offers tighter thermal design margins and lower conduction loss at nominal 5A loads, making it optimal for cost-sensitive 5A industrial and automotive applications.
Availability
MAX26405AFOAY+ is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V point-of-load, and telecom subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26405AFOAY+ 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 precision instrumentation, industrial automation, and automotive markets since 1965.
The MAX26405AFOAY+ belongs to the MAX264xx Silent Switcher® buck converter family, engineered specifically for low-EMI, high-efficiency power conversion in space- and noise-constrained automotive and industrial environments.
FAQ
What is the maximum continuous output current supported by the MAX26405AFOAY+?
The MAX26405AFOAY+ is rated for 5A continuous output current, as confirmed in the Electrical Characteristics table under "High-Side DMOS Current-Limit Threshold" for the MAX26405 variant (6.5A min, 7.5A typ). This rating assumes proper thermal management using the FC2QFN-17 package's 10.2°C/W θJB on a 4-layer EV kit board and operation within –40°C to +125°C ambient temperature.
Does the MAX26405AFOAY+ support fixed 5V output without external resistors?
Yes, the MAX26405AFOAY+ supports fixed 5V output by connecting the FB pin directly to the BIAS pin (1.8V), as specified in the Applications Information section. This configuration eliminates external feedback resistors and achieves ±1% output accuracy in FPWM mode at no load, simplifying design for standard 5V rail applications.
How does the MAX26405AFOAY+ achieve low EMI performance?
The MAX26405AFOAY+ achieves low EMI through Analog Devices' Silent Switcher® architecture: symmetrical FC2QFN-17 pinout minimizes hot-loop area, integrated bypass capacitors reduce high-frequency ringing, and optional spread-spectrum modulation (±3% at 2.1MHz) spreads energy across a wider bandwidth. These features collectively suppress radiated emissions below CISPR-25 Class 5 limits without requiring complex shielding.
Can the MAX26405AFOAY+ operate in dropout mode, and what is the minimum input voltage?
Yes, the MAX26405AFOAY+ supports dropout operation up to 99% duty cycle, enabling regulation when input voltage approaches the output level. For its fixed 5V output, the minimum functional input is 5.05V (5V ÷ 0.99), validated in the Recommended Operating Conditions table and critical for automotive cold-crank scenarios where battery voltage dips below 6V.
What is the role of the VEA pin on the MAX26405AFOAY+ in dual-phase configurations?
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 both VEA pins ensures dynamic current sharing accuracy better than 1% under load transients, as documented in the Detailed Description section. This eliminates the need for external current-sense amplifiers or complex phase-control ICs.
MAX26405AFOAY+ 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:
- 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+ FAQ
1.How can I place an order for MAX26405AFOAY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26405AFOAY+ 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+ reliable?
The price and inventory of MAX26405AFOAY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26405AFOAY+ is usually 5 days.
3.What payment methods are accepted for MAX26405AFOAY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26405AFOAY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26405AFOAY+?
MAX26405AFOAY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26405AFOAY+ 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+?
For technical support, including MAX26405AFOAY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26405AFOAY+ requirements.
6.How does Aetrix verify that MAX26405AFOAY+ is sourced from the original manufacturer or authorized distributors?
All MAX26405AFOAY+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX26405AFOAY+?
All MAX26405AFOAY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26405AFOAY+, 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+ part is unused and in its original packaging.
Return procedure for MAX26405AFOAY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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