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Analog Devices Inc./Maxim Integrated MAX26404AFOAY+T
- Part No.:
- MAX26404AFOAY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26404AFOAY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:2,237
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Product details
Overview
MAX26404AFOAY+T 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, features PGOOD monitoring, 99% dropout duty cycle, and operates in ultra-low-quiescent-current skip mode (10μA) - ideal for automotive point-of-load and industrial 24V power rails.
For engineers reviewing the MAX26404AFOAY+T datasheet, MAX26404AFOAY+T pinout, MAX26404AFOAY+T application, or MAX26404AFOAY+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 option, dual-phase VEA-based current sharing, and compatibility with 3.3V/5V fixed or 0.8V–10V adjustable outputs.
Technical Context
The MAX26404AFOAY+T 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 delivers precise transient response and optimized phase margin.
It supports dual-phase operation via SYNCOUT (180° out-of-phase clock) and VEA (shared error amplifier node), enabling dynamic current sharing between controller and target ICs. Forced-PWM and skip-mode operation are selected via the SYNC pin, and spread-spectrum modulation (±3% fSW) is factory-enabled to reduce radiated EMI without external components.
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/36V rails without pre-regulation. |
| Output Current | 4A continuous - rated for sustained load in compact 3.5mm × 3.75mm FC2QFN package with θJB = 10.2°C/W. |
| Switching Frequency | Fixed 2.1MHz - enables use of sub-1µH inductors and <10µF ceramic output capacitors, minimizing solution size and avoiding AM band interference. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules and IoT edge nodes during standby. |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable logic-level supply for FPGAs, microcontrollers, and ADCs without post-regulation. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor PCB heatsinking in enclosed industrial enclosures. |
| PGOOD Threshold | 92–96% of VOUT rising - provides precise power-good assertion for system sequencers and processor reset controllers. |
Pinout & Package
MAX26404AFOAY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND) and symmetrical VIN/PGND layout optimized for low-EMI PCB design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage-compatible (up to 42V) logic enable; pulls device into 4μA shutdown when low. |
| 2 BST | Bootstrap supply | Connects 0.1μF capacitor between BST and LX to drive high-side MOSFET gate above SUP rail. |
| 3,9 SUP | Main power input | Dual-supply pins reduce IR drop and improve EMI; require parallel 1μF + 4.7μF ceramic input capacitance. |
| 4,5,7,8 PGND | Power ground | Four dedicated PGND pins minimize ground bounce and enhance thermal conduction to PCB copper. |
| 6 LX | Switch node | Connects to inductor switch node; high dv/dt node requiring tight layout and minimal trace length. |
| 10 GND | Analog ground | Separate AGND reference for feedback and error amplifier; must be connected to PGND at single point near IC. |
| 11 BIAS | Internal 1.8V LDO output | Supplies internal circuitry; requires ≥2.2μF ceramic cap to PGND; powers FB divider for fixed-output configuration. |
| 12 FB | Feedback input | Connect to BIAS for 3.3V/5V fixed output; connect external resistor-divider for 0.8V–10V adjustable regulation. |
| 13 OUT | Output voltage sense | Direct connection to regulated output rail; used with FB for remote sensing in high-current applications. |
| 14 VEA | Voltage error amplifier output | Shared between controller/target in dual-phase setups to enforce precise current matching (<±3% imbalance). |
| 15 PGOOD | Open-drain power-good | Asserts after soft-start and VOUT reaches 92–96%; requires external pull-up to BIAS or VOUT for system reset logic. |
| 16 SYNC | Mode select / sync input | Pull to GND for skip mode; pull to BIAS for forced-PWM; accept external clock up to 2.6MHz for synchronization. |
| 17 SYNCOUT | 180° out-of-phase clock | Active only in FPWM mode; drives target IC's SYNC pin in dual-phase configurations; open for single-phase use. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop layout with symmetrical hot-loop paths reduces peak radiated EMI by >30dB vs conventional buck ICs. |
| Spread-spectrum modulation | ±3% triangular dither at 4.5kHz (2.1MHz fSW) lowers EMI peaks without affecting loop stability or output ripple. |
| 99% maximum duty cycle | Enables operation with VIN as low as 3.3V for 3.3V output - critical for cold-crank automotive scenarios (6.5V min). |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and avoids brownout in multi-rail systems during power-up. |
| Dual-phase current sharing | VEA-connected architecture achieves <±3% load current mismatch between phases under transient and steady-state conditions. |
| Low-IQ dual-phase standby | Target IC disabled via EN pin reduces total system IQ to <5μA - suitable for always-on vehicle telematics modules. |
Applications
| Automotive ADAS Camera Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers image sensor and ISP in rear-view camera module with 12V battery input subject to load dump and cold-crank. IC Role / Device Role / Timing Role: Primary 3.3V/4A buck regulator delivering clean, low-noise power with PGOOD sequencing and 99% dropout support. Use Value: Silent Switcher EMI suppression eliminates need for ferrite beads or shielding cans, reducing BOM cost and board area by 25%. |
Use Scenario: Supplies 5V/4A to isolated digital I/O channels in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Point-of-load regulator with wide 3V–36V input handling unregulated 24V DC field power and transient surges. Use Value: 10μA skip-mode IQ extends backup battery runtime during mains failure; thermal shutdown protects against enclosure overheating. |
| Telecom Remote Radio Unit | Medical Portable Monitor |
|
Use Scenario: Generates 5V for FPGA and RF front-end in outdoor small-cell base station powered from -48V telecom supply via intermediate 12V rail. IC Role / Device Role / Timing Role: Secondary buck stage operating at 2.1MHz to minimize inductor size and meet strict EMI Class B limits. Use Value: Spread-spectrum + symmetrical FC2QFN layout meets EN55032 Class B without added filtering - cuts time-to-certification by 6 weeks. |
Use Scenario: Powers ARM Cortex-M7 MCU and analog front-end in battery-operated patient monitor requiring 10-year shelf life. IC Role / Device Role / Timing Role: Ultra-low-IQ 3.3V buck converter with 2.5ms soft-start ensuring controlled power-up of sensitive analog circuits. Use Value: 10μA no-load IQ extends primary Li-ion battery life by 3.2 years in sleep mode; ±1% accuracy maintains ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 4.5V–36V input, 8A rating, 2.1MHz, no spread spectrum, larger 4mm × 4mm QFN-16 package. | Higher current capability but higher EMI; lacks dual-phase VEA interface and 99% dropout. | Choose LM61480RQR only if >6A output or lower BOM cost is prioritized over EMI compliance and footprint. |
| MPQ4420AGL-A | 3.3V–36V input, 2A rating, 400kHz/2.2MHz selectable, no PGOOD, no spread spectrum, 3mm × 4mm QFN-16. | Lower current, no dual-phase support, no thermal shutdown hysteresis, limited EMI mitigation. | MPQ4420AGL-A suits cost-sensitive non-automotive applications where 2A suffices and EMI is less constrained. |
Compared with LM61480RQR and MPQ4420AGL-A, the MAX26404AFOAY+T uniquely combines 4A/36V operation with Silent Switcher EMI suppression, dual-phase VEA current sharing, and automotive-grade thermal protection - making it the only choice for space-constrained, EMI-sensitive 12V/24V industrial and automotive designs requiring <10μA IQ.
Availability
MAX26404AFOAY+T is available at Aetrix Electronics and suitable for automotive ADAS camera power, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26404AFOAY+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, and automotive safety markets.
The MAX26404AFOAY+T belongs to the MAX264xx Silent Switcher buck converter family, engineered specifically for EMI-critical automotive and industrial point-of-load applications demanding ultra-low noise, high efficiency, and compact 3.5mm × 3.75mm solutions.
FAQ
What is the maximum output current supported by the MAX26404AFOAY+T?
The MAX26404AFOAY+T is rated for 4A continuous output current under typical thermal conditions (TA = +70°C, 4-layer EV kit). Its 3.5mm × 3.75mm FC2QFN package achieves θJB = 10.2°C/W, enabling full 4A operation with proper PCB copper pour and airflow. Derating applies above +70°C ambient per the 34.48mW/°C thermal coefficient.
Does the MAX26404AFOAY+T support adjustable output voltages?
Yes, the MAX26404AFOAY+T supports both fixed and adjustable outputs. Connect FB directly to BIAS for factory-configured 3.3V or 5.0V outputs. For adjustable operation, use an external resistor-divider from OUT to FB to GND, enabling regulation from 0.8V to 10V with ±1% accuracy in FPWM mode at no load.
How does the MAX26404AFOAY+T achieve low EMI performance?
The MAX26404AFOAY+T uses Analog Devices' Silent Switcher® architecture with integrated dual-loop layout, symmetrical hot-loop routing, and FC2QFN package pin symmetry to minimize magnetic field coupling. It also includes factory-enabled spread-spectrum modulation (±3% fSW) and supports external synchronization - collectively reducing peak radiated emissions by >30dB versus conventional buck converters.
Can the MAX26404AFOAY+T operate in dropout mode?
Yes, the MAX26404AFOAY+T supports 99% maximum duty cycle operation, allowing it to maintain regulation when input voltage drops close to the output voltage - e.g., 3.6V input for 3.3V output. This dropout capability is essential for automotive cold-crank (6.5V min) and industrial brownout conditions.
What thermal protection features does the MAX26404AFOAY+T include?
The MAX26404AFOAY+T includes thermal shutdown at TJ = 165°C with 20°C hysteresis, overtemperature lockout that disables switching until junction temperature falls below 145°C, and robust short-circuit protection with hiccup mode activation when output voltage collapses under overload. These ensure safe operation in sealed enclosures and high-ambient environments.
MAX26404AFOAY+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:
- 4A
- 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)
MAX26404AFOAY+T FAQ
1.How can I place an order for MAX26404AFOAY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26404AFOAY+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 MAX26404AFOAY+T reliable?
The price and inventory of MAX26404AFOAY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26404AFOAY+T is usually 5 days.
3.What payment methods are accepted for MAX26404AFOAY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26404AFOAY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26404AFOAY+T?
MAX26404AFOAY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26404AFOAY+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 MAX26404AFOAY+T?
For technical support, including MAX26404AFOAY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26404AFOAY+T requirements.
6.How does Aetrix verify that MAX26404AFOAY+T is sourced from the original manufacturer or authorized distributors?
All MAX26404AFOAY+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 MAX26404AFOAY+T meets industry standards.
7.What is the process for return or replacement of MAX26404AFOAY+T?
All MAX26404AFOAY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26404AFOAY+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 MAX26404AFOAY+T part is unused and in its original packaging.
Return procedure for MAX26404AFOAY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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