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Analog Devices Inc./Maxim Integrated MAX26404AFODY+
- Part No.:
- MAX26404AFODY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26404AFODY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:2,873
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Product details
Overview
MAX26404AFODY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter with 4A output current rating, 3V–36V input range, and fixed 2.1MHz switching frequency. It integrates high-side and low-side MOSFETs, delivers ±1% output voltage accuracy at no load, features PGOOD monitoring, and operates in dropout at 99% duty cycle-ideal for automotive front-end and industrial 24V point-of-load applications.
For engineers reviewing the MAX26404AFODY+ datasheet, MAX26404AFODY+ pinout, MAX26404AFODY+ application, or MAX26404AFODY+ equivalent, key selection criteria include its 4A current rating (distinct from MAX26405/MAX26406 variants), FC2QFN-17 package thermal performance, spread-spectrum EMI reduction capability, and dual-phase VEA-based current sharing architecture.
Technical Context
The MAX26404AFODY+ implements average current-mode control with internal slope compensation, enabling robust noise immunity and stable operation across wide VIN/VOUT ratios. Its 33ns minimum on-time supports high step-down ratios without pulse skipping, while the MAXQ® power architecture ensures precise transient response and >60° phase margin.
It supports forced-PWM or skip-mode operation via SYNC pin logic level, includes 2.5ms internal soft-start, and integrates a 1.8V BIAS regulator with 1.58V UVLO hysteresis. Thermal shutdown activates at 165°C with 20°C hysteresis, and short-circuit protection employs hiccup mode with 25ms off-time under hard shorts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - matches MAX26404 variant's current-limit threshold of 6.25A typical (min 5.5A, max 7.0A) |
| Input Voltage Range | 3V to 36V - enables direct connection to automotive battery (9V–16V) and industrial 24V/36V rails without pre-regulation |
| Switching Frequency | 2.1MHz fixed - allows use of sub-1µH inductors and reduces output ripple; avoids AM band interference |
| Quiescent Current | 10µA in skip mode - extends battery life in always-on automotive modules and IoT edge nodes |
| Output Voltage Accuracy | ±1% in FPWM mode at no load - ensures reliable powering of precision analog and MCU subsystems |
| Thermal Performance | θJA = 28.9°C/W on EV kit - supports 4A operation up to +125°C ambient without forced airflow |
| Duty Cycle Max | 99% - sustains regulation during cold-crank (6V input) with 5V output, critical for automotive compliance |
Pinout & Package
MAX26404AFODY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND). Symmetrical SUP/PGND layout minimizes loop area and enhances EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | High-voltage compatible (up to 42V); pulls device into ultra-low 4µA shutdown when low |
| 2 BST | Bootstrap supply | Requires 0.1µF ceramic capacitor to LX; enables high-side gate drive above SUP rail |
| 3,9 SUP | Main power input | Dual pins reduce IR drop and improve thermal spreading; connect 1µF + 4.7µF ceramic bulk |
| 4,5,7,8 PGND | Power ground return | Four dedicated pins minimize ground bounce and support high di/dt switching currents |
| 6 LX | Switch node | Connects to inductor; high impedance when off; requires low-inductance layout to limit ringing |
| 10 GND | Analog ground reference | Separate from PGND to isolate noise-sensitive feedback and error amplifier paths |
| 11 BIAS | Internal 1.8V LDO output | Supplies internal circuitry; requires ≥2.2µF ceramic cap to PGND; used to set fixed 3.3V/5V outputs |
| 12 FB | Feedback input | 0.8V reference; connect to BIAS for fixed output or external resistor-divider for adjustable 0.8V–10V |
| 13 OUT | Output voltage sense | Direct connection to regulated output; enables accurate remote sensing and PGOOD monitoring |
| 14 VEA | Voltage-error amplifier output | Used only in dual-phase configuration to share current between controller and target ICs |
| 15 PGOOD | Open-drain power-good flag | Asserts after soft-start and when VOUT is within 92–96% of target; requires external pull-up |
| 16 SYNC | Mode control & sync input | Pull to BIAS for FPWM; pull 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-phase setup; leave open for single-phase |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters through symmetrical hot-loop layout and integrated bypass caps |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz - lowers peak EMI emissions without affecting regulation or efficiency |
| Dual-phase current sharing | VEA pin enables <±3% dynamic current mismatch between phases - supports scalable 8A designs using two MAX26404AFODY+ |
| Low-dropout operation | 99% max duty cycle allows 5V output from 5.05V input - essential for automotive cold-crank survival |
| Integrated BIAS regulator | 1.8V LDO powers internal logic and gate drivers - eliminates need for external bias supply and simplifies BOM |
Applications
| Automotive Front-End Power | Industrial 24V Point-of-Load |
|---|---|
Use Scenario: Powering infotainment head-unit SoC and CAN transceivers from 12V battery with cold-crank (6V) tolerance. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/3.3V with PGOOD sequencing and hiccup-mode short-circuit protection. Use Value: 99% duty cycle maintains regulation during 6V cold-crank; ±1% accuracy ensures reliable MCU boot; Silent Switcher meets CISPR 25 Class 5 EMI limits. | Use Scenario: Supplying FPGA I/O banks and ADC reference in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency, low-noise local regulator with fast transient response to handle FPGA configuration current surges. Use Value: 2.1MHz switching enables compact 1µH inductor; 10µA quiescent current reduces standby power; dual-phase option scales to 8A for multi-rail systems. |
| Telecom Base Station RF Module | Medical Imaging Sensor Interface |
Use Scenario: Generating clean 3.3V supply for GaN PA bias control and digital front-end in small-cell radio units. IC Role / Device Role / Timing Role: Low-EMI power stage placed near sensitive RF components; synchronized via SYNC to avoid beat frequencies. Use Value: Spread-spectrum and symmetrical FC2QFN package suppress radiated emissions below -60dBm; PGOOD enables safe PA enable sequencing. | Use Scenario: Powering low-noise analog signal chain (LNA, PGA, 16-bit SAR ADC) in portable ultrasound probes. IC Role / Device Role / Timing Role: Precision DC-DC converter with tight output tolerance and minimal PSRR degradation across 10Hz–1MHz. Use Value: ±1% VOUT accuracy and 1.8V BIAS LDO ensure stable reference voltages; 2.1MHz operation avoids interference with ultrasound carrier frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX26405AFODY+ | 5A rated (7.5A typical ILIM), same package and pinout - higher current capability with identical footprint | Preferred where 5A continuous load margin is required; shares all features including dual-phase and spread-spectrum | Select MAX26405AFODY+ when design load exceeds 4A but remains ≤5A; no PCB change needed |
| LM61460QWRXRRQ1 | Automotive-grade 6A buck (TI), 3.8V–36V input, 2.1MHz, but lacks integrated spread-spectrum and VEA-based dual-phase | Used in ASIL-B systems requiring AEC-Q100 Grade 1 qualification; no native current-sharing interface | Choose LM61460QWRXRRQ1 only when AEC-Q100 Grade 1 certification is mandatory and dual-phase scaling is not required |
Compared with MAX26405AFODY+, the MAX26404AFODY+ offers tighter current-limit threshold (5.5–7.0A vs 6.5–8.5A) and lower conduction loss at light loads, making it optimal for 4A-constrained space- and thermally-limited applications; versus LM61460QWRXRRQ1, it provides superior EMI performance and seamless dual-phase scalability at the cost of formal AEC-Q100 certification.
Availability
MAX26404AFODY+ is available at Aetrix Electronics and suitable for automotive front-end power, industrial 24V point-of-load, telecom RF module, and medical imaging sensor interface applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX26404AFODY+ 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 industrial, automotive, communications, and healthcare markets.
The MAX26404AFODY+ belongs to the MAX2640x Silent Switcher® buck converter family, engineered specifically for low-EMI, high-density power delivery in automotive and industrial environments where board space, thermal constraints, and regulatory EMI compliance are critical.
FAQ
What is the maximum output current rating of the MAX26404AFODY+?
The MAX26404AFODY+ is rated for 4A continuous output current. This is defined by its current-limit threshold of 5.5A (min), 6.25A (typ), and 7.0A (max) - distinct from the 5A-rated MAX26405AFODY+ and 6A-rated MAX26406AFODY+. The 4A rating reflects its optimized FET RDS(ON) and thermal design for compact 3.5mm × 3.75mm layouts. Derating is recommended above +85°C ambient per the θJA = 28.9°C/W spec.
Does the MAX26404AFODY+ support fixed-output voltage configurations?
Yes, the MAX26404AFODY+ supports fixed 3.3V and 5.0V outputs. To enable either, connect the FB pin directly to the BIAS pin (1.8V). No external resistor divider is required. The device achieves ±1% output voltage accuracy in forced-PWM mode at no load, and ±0.5% typical accuracy across line/load/temperature when configured for fixed output. Other fixed options (2.9V–6.0V in 100mV steps) require ordering specific variants - MAX26404AFODY+ is factory-configured for 3.3V/5.0V only.
How does the MAX26404AFODY+ achieve low EMI performance?
The MAX26404AFODY+ achieves low EMI through three integrated techniques: (1) Silent Switcher® architecture with symmetrical, minimized hot-loop layout and integrated bootstrap capacitors; (2) spread-spectrum frequency modulation (±3% around 2.1MHz) to spread energy across a bandwidth; and (3) FC2QFN-17 package with balanced SUP/PGND pin placement that reduces common-mode noise coupling. These features collectively reduce peak radiated emissions by >30dB compared to conventional buck converters, helping meet CISPR 25 Class 5 requirements without added shielding or filtering.
Can the MAX26404AFODY+ be used in dual-phase configurations?
Yes, the MAX26404AFODY+ supports dual-phase operation using the VEA and SYNCOUT pins. One device acts as controller (SYNC tied to BIAS), the other as target (SYNC tied to GND or left floating, SYNCOUT connected to controller's SYNCOUT). The VEA pins are connected to enable dynamic current sharing with <±3% mismatch. Dual-phase operation is limited to forced-PWM mode; skip mode disables SYNCOUT. Two MAX26404AFODY+ devices deliver up to 8A total with shared thermal load and improved transient response - verified in Analog Devices' reference design MAX26404EVKIT#.
What thermal management considerations apply to the MAX26404AFODY+?
The MAX26404AFODY+ uses a 3.5mm × 3.75mm FC2QFN package with exposed thermal pad (pin 10 GND). For reliable 4A operation at +125°C ambient, a 4-layer PCB with ≥4 thermal vias (0.3mm diameter, filled or capped) connecting the pad to inner ground planes is required. Thermal resistance is θJA = 28.9°C/W on EV kit; derating begins above +70°C at 34.48mW/°C. The device includes thermal shutdown at 165°C with 20°C hysteresis, and junction temperature must stay ≤+150°C for 5,000-hour reliability per datasheet Note 3.
MAX26404AFODY+ 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:
- 4A
- 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)
MAX26404AFODY+ FAQ
1.How can I place an order for MAX26404AFODY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26404AFODY+ 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 MAX26404AFODY+ reliable?
The price and inventory of MAX26404AFODY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26404AFODY+ is usually 5 days.
3.What payment methods are accepted for MAX26404AFODY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26404AFODY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26404AFODY+?
MAX26404AFODY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26404AFODY+ 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 MAX26404AFODY+?
For technical support, including MAX26404AFODY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26404AFODY+ requirements.
6.How does Aetrix verify that MAX26404AFODY+ is sourced from the original manufacturer or authorized distributors?
All MAX26404AFODY+ 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 MAX26404AFODY+ meets industry standards.
7.What is the process for return or replacement of MAX26404AFODY+?
All MAX26404AFODY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26404AFODY+, 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 MAX26404AFODY+ part is unused and in its original packaging.
Return procedure for MAX26404AFODY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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