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Analog Devices Inc./Maxim Integrated MAX26405AFOBY+
- Part No.:
- MAX26405AFOBY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26405AFOBY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,496
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Product details
Overview
MAX26405AFOBY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 5A continuous output current with 3V to 36V input voltage range. It features fixed 2.1MHz switching frequency, 10μA no-load quiescent current in skip mode, ±1% output voltage accuracy, and PGOOD monitoring - designed for automotive point-of-load regulation where low EMI and high efficiency across wide VIN are critical.
For engineers reviewing the MAX26405AFOBY+ datasheet, MAX26405AFOBY+ pinout, MAX26405AFOBY+ application, or MAX26405AFOBY+ equivalent, key selection criteria include its 17-pin FC2QFN package, dual-phase capability via VEA/SYNCOUT, spread-spectrum EMI reduction, forced-PWM/skip-mode control via SYNC pin, and internal 2.5ms soft-start - all validated for -40°C to +125°C operation in industrial and automotive power systems.
Technical Context
The MAX26405AFOBY+ implements average current-mode control with integrated high-side (45mΩ typical) and low-side (22mΩ typical) MOSFETs, enabling precise dynamic current sharing in dual-phase configurations. Its MAXQ® power architecture delivers >90% efficiency at 12VIN/5VOUT and supports 99% duty-cycle dropout operation for minimal voltage headroom.
It uses symmetrical FC2QFN pinout with dedicated PGND pins (pins 4,5,7,8) and thermal-enhanced bottom-side copper for 10.2°C/W θJCB, while spread-spectrum modulation (±3% fSW) reduces peak EMI emissions without external filtering - confirmed for CISPR 25 Class 5 compliance in automotive layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to 12V/24V automotive batteries and industrial rails without pre-regulation. |
| Output Current | 5A continuous - matches MAX26405 variant rating per datasheet Table "Electrical Characteristics" (ILIM = 6.5A–8.5A typ). |
| Switching Frequency | 2.1MHz fixed - enables use of sub-1μH inductors (e.g., 1.0μH) and <10μF ceramic output capacitors for compact layout. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Output Accuracy | ±1% in FPWM mode at no load - ensures stable logic supply for FPGAs, microcontrollers, and SerDes interfaces. |
| Thermal Range | -40°C to +125°C junction - qualified for under-hood automotive and industrial control cabinet deployment. |
| EMI Reduction | Silent Switcher® architecture + spread-spectrum option - eliminates need for ferrite beads or metal shielding in space-constrained designs. |
Pinout & Package
MAX26405AFOBY+ is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND), symmetrical VIN/PGND layout for optimal EMI suppression, and 0.4mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | High-voltage compatible (up to 42V); pulls device into 4μA shutdown when low - enables ignition-synchronized power sequencing. |
| 2 BST | Bootstrap supply | Connects 0.1μF capacitor between BST and LX to drive high-side MOSFET gate - critical for 99% duty-cycle dropout operation. |
| 3,9 SUP | Main IC supply input | Dual-input configuration reduces high-frequency input ripple; requires parallel 1μF + 4.7μF ceramic/low-ESR caps for stable bias. |
| 4,5,7,8 PGND | Power ground return | Four dedicated PGND pins minimize ground bounce and improve current sharing in dual-phase setups. |
| 6 LX | Switch node | Connects to inductor switch node; handles 6A RMS current - requires tight layout with short traces to reduce EMI and ringing. |
| 10 GND | Analog ground | Separate AGND reference for feedback loop; must be connected to PGND only at single point near IC for noise isolation. |
| 11 BIAS | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND - powers FB divider and error amplifier independently of VOUT. |
| 12 FB | Feedback input | Connect to BIAS for fixed 3.3V/5.0V output; or use resistor divider for 0.8V–10V adjustable regulation - sets output with 0.8V reference. |
| 13 OUT | Output voltage sense | Direct connection to regulated output rail - enables accurate remote sensing and PGOOD threshold detection. |
| 14 VEA | Voltage-error amplifier output | Shared between controller/target ICs in dual-phase mode - enables precise current balancing without external op-amps. |
| 15 PGOOD | Open-drain power-good signal | Asserts after soft-start and VOUT reaches 92–96% of target - used for system reset, sequencing, or fault logging. |
| 16 SYNC | Mode selection & sync input | Pull to GND for skip mode (low IQ); pull to BIAS for forced-PWM (low noise); accepts external clock up to 2.6MHz. |
| 17 SYNCOUT | 180° out-of-phase clock output | Drives second phase in dual-phase configuration - disabled in skip mode; enables 10A+ solutions with <5% current mismatch. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters - eliminates costly shielding and filter components in automotive EMC testing. |
| Dual-phase capability | Enables 10A+ output using two MAX26405AFOBY+ ICs with <3% current imbalance - avoids discrete current-sharing circuits and improves thermal distribution. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1MHz - lowers peak EMI emissions to meet CISPR 25 Class 5 without layout changes. |
| 99% duty-cycle dropout | Supports operation down to VIN = VOUT + 0.3V - ideal for start-stop automotive systems where battery dips to 6V during cranking. |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and downstream loads - eliminates need for external soft-start timing components. |
Applications
| Automotive ADAS Camera Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powers image sensor, ISP, and MIPI interface in rear-view camera with 12V battery input subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V POL regulator with PGOOD sequencing and 99% dropout for uninterrupted operation during 6V cranking events. Use Value: Silent Switcher® EMI performance avoids interference with 5GHz radar bands; 10μA skip-mode IQ extends parking-mode runtime. | Use Scenario: Supplies isolated 5V logic rails for digital I/O modules in 24V industrial control cabinets with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: High-efficiency buck converter with thermal shutdown (165°C) and overcurrent protection - replaces discrete DC/DC + LDO combos. Use Value: FC2QFN package enables dense board layout; dual-phase support allows scalable 10A design for multi-channel expansion cards. |
| Telecom Remote Radio Unit | Medical Point-of-Care Monitor |
Use Scenario: Generates clean 3.3V supply for FPGA-based baseband processing in outdoor small-cell radios powered from 48V PoE-derived rails. IC Role / Device Role / Timing Role: Low-noise, high-PWM-frequency buck with spread-spectrum - meets stringent conducted/radiated emission limits for FCC Part 15B. Use Value: 2.1MHz switching avoids AM band interference; symmetrical pinout simplifies 4-layer PCB stackup for EMI control. | Use Scenario: Powers patient interface electronics (touchscreen, ECG front-end) requiring ultra-low EMI and reliable startup across medical-grade 24V AC/DC adapters. IC Role / Device Role / Timing Role: Primary 5V POL regulator with fixed soft-start and PGOOD monitoring - ensures deterministic power-up sequence for FDA-compliant firmware boot. Use Value: ±1% output accuracy maintains ADC reference stability; -40°C to +125°C rating covers sterilization and transport temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61460QWRXRRQ1 | 4.5V–36V input, 6A, 2.1MHz, AEC-Q100 Grade 1; no spread-spectrum; 16-pin WQFN | Lacks integrated spread-spectrum and dual-phase VEA/SYNCOUT; requires external current-sharing circuitry for >6A | Preferred where AEC-Q100 Grade 1 qualification is mandatory and EMI filtering is handled externally. |
| MPQ4436AGL-A | 3.3V–36V input, 5A, 2.2MHz, no spread-spectrum; 16-pin QFN; lacks PGOOD and SYNCOUT | No dual-phase support or PGOOD output - unsuitable for safety-critical sequencing or multiphase scaling | Selected for cost-sensitive industrial applications where basic 5A regulation suffices and EMI is managed at system level. |
Compared with LM61460QWRXRRQ1 and MPQ4436AGL-A, the MAX26405AFOBY+ provides unique integration of spread-spectrum EMI reduction, dual-phase current sharing via VEA/SYNCOUT, and automotive-grade thermal robustness - making it optimal for space-constrained, high-reliability 5A POL designs where board-level EMI mitigation is impractical.
Availability
MAX26405AFOBY+ is available at Aetrix Electronics and suitable for automotive ADAS, industrial PLCs, telecom remote radio units, and medical point-of-care monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26405AFOBY+ 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 MAX26405AFOBY+ belongs to the MAX264xx Silent Switcher® buck converter family, engineered specifically for low-EMI, high-density power delivery in automotive and industrial environments where thermal stress, input transients, and regulatory emissions compliance are critical.
FAQ
What is the maximum continuous output current supported by the MAX26405AFOBY+?
The MAX26405AFOBY+ supports 5A continuous output current, as defined by its ILIM specification range of 6.5A–8.5A (typical) and validated thermal performance in the 3.5mm × 3.75mm FC2QFN package. This rating holds across the full -40°C to +125°C operating temperature range with appropriate PCB copper area and airflow per the JEDEC 4-layer thermal data (θJA = 38.4°C/W).
Does the MAX26405AFOBY+ support dual-phase operation, and how is it implemented?
Yes, the MAX26405AFOBY+ supports dual-phase operation using its dedicated VEA (pin 14) and SYNCOUT (pin 17) pins. In a two-IC setup, one acts as controller (SYNC pulled high) and the other as target (SYNCOUT connected to BIAS). The controller's VEA drives the target's VEA to enforce matched current sharing - achieving <5% imbalance even during fast load transients, as confirmed in the "Dual-Phase Operation" section of the datasheet.
What is the purpose of the SYNC pin on the MAX26405AFOBY+, and what are its valid logic states?
The SYNC pin on the MAX26405AFOBY+ controls operating mode and external synchronization. Pulling SYNC to GND enables skip mode for ultra-low 10μA quiescent current at light loads. Pulling SYNC to BIAS enables forced-PWM mode for constant-frequency, low-noise operation. It also accepts external clock signals (360kHz–2.6MHz) for system-level timing alignment - with automatic fallback to internal oscillator if external clock is lost for >2 cycles.
How does the MAX26405AFOBY+ achieve low EMI performance without external filters?
The MAX26405AFOBY+ achieves low EMI through three integrated techniques: (1) Silent Switcher® architecture with balanced, symmetrical power loops and dedicated PGND pins; (2) spread-spectrum frequency modulation (±3% around 2.1MHz) to distribute energy across a wider bandwidth; and (3) optimized internal gate drivers and minimum on-time (33ns) to suppress high-frequency ringing - collectively eliminating need for ferrite beads or metal shields in most automotive and industrial layouts.
Can the MAX26405AFOBY+ operate with input voltage as low as the output voltage, and how is this achieved?
Yes, the MAX26405AFOBY+ supports dropout operation down to VIN ≈ VOUT via 99% maximum duty cycle - enabled by its internal bootstrap circuit (BST pin) and low RDS(ON) MOSFETs (45mΩ HS / 22mΩ LS). This allows stable regulation during automotive cold-crank events where battery voltage drops to 6V while powering a 5V rail, without requiring an additional pre-regulator stage.
MAX26405AFOBY+ 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:
- 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)
MAX26405AFOBY+ FAQ
1.How can I place an order for MAX26405AFOBY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26405AFOBY+ 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 MAX26405AFOBY+ reliable?
The price and inventory of MAX26405AFOBY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26405AFOBY+ is usually 5 days.
3.What payment methods are accepted for MAX26405AFOBY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26405AFOBY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26405AFOBY+?
MAX26405AFOBY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26405AFOBY+ 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 MAX26405AFOBY+?
For technical support, including MAX26405AFOBY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26405AFOBY+ requirements.
6.How does Aetrix verify that MAX26405AFOBY+ is sourced from the original manufacturer or authorized distributors?
All MAX26405AFOBY+ 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 MAX26405AFOBY+ meets industry standards.
7.What is the process for return or replacement of MAX26405AFOBY+?
All MAX26405AFOBY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26405AFOBY+, 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 MAX26405AFOBY+ part is unused and in its original packaging.
Return procedure for MAX26405AFOBY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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