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Analog Devices Inc./Maxim Integrated MAX26404AFOAY+
- Part No.:
- MAX26404AFOAY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26404AFOAY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
MAX26404AFOAY+ from Analog Devices is a 36V input, 4A synchronous Silent Switcher® buck converter with integrated high-side and low-side MOSFETs, fixed 2.1MHz switching frequency, ±1% output voltage accuracy in FPWM mode, and 10μA quiescent current in skip mode-designed for automotive point-of-load power in 12V/24V systems.
For engineers reviewing the MAX26404AFOAY+ datasheet, MAX26404AFOAY+ pinout, MAX26404AFOAY+ application, or MAX26404AFOAY+ equivalent, key selection criteria include its 3.5mm × 3.75mm FC2QFN-17 package, dual-phase capability via VEA/SYNCOUT, spread-spectrum EMI reduction, 99% dropout duty cycle, and programmable 0.8V–10V or fixed 3.3V/5V output configuration.
Technical Context
The MAX26404AFOAY+ implements average current-mode control with internal slope compensation, enabling robust noise rejection and precise dynamic current sharing in dual-phase configurations. Its MAXQ® power architecture delivers high phase margin and transient response without external compensation.
It supports forced-PWM or automatic skip-mode operation via SYNC pin logic level, integrates a 1.8V BIAS regulator with 2.2μF decoupling, and features 33ns minimum on-time for high step-down ratios. Thermal shutdown at 165°C with 20°C hysteresis and hiccup-mode short-circuit protection ensure robust operation in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery rails (12V/24V) with undervoltage lockout at 2.725V (falling) |
| Output Current | 4A continuous - rated for sustained load in industrial POE applications without derating at +125°C ambient |
| Switching Frequency | 2.1MHz fixed - enables use of sub-1μH inductors and compact 0603 ceramic input capacitors, avoiding AM band interference |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules during sleep states |
| Output Voltage Accuracy | ±1% at no load in FPWM mode - ensures stable supply to precision analog or MCU cores without post-regulation |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + 0.36V, critical for cold-crank automotive conditions |
| PGOOD Threshold | 94% VOUT rising - provides reliable power-good assertion with 100μs debounce, compatible with FPGA/CPU reset sequencing |
Pinout & Package
MAX26404AFOAY+ is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND), symmetrical SUP/PGND layout for optimized EMI performance and thermal dissipation (θJB = 10.2°C/W on 4-layer EV kit).
| 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 to LX to drive high-side MOSFET gate; critical for proper 99% duty-cycle operation |
| 3,9 SUP | Main IC supply input | Dual-input pins reduce high-frequency input ripple; requires parallel 1μF + 4.7μF ceramic/low-ESR bulk capacitance |
| 4,5,7,8 PGND | Power ground | Four dedicated PGND pins minimize ground bounce and improve current sharing in dual-phase setups |
| 6 LX | Switch node | Connects to inductor switch node; carries full AC ripple current; must be routed with minimal loop area for EMI control |
| 10 GND | Analog ground | Separate AGND reference for feedback and error amplifier; must be connected to PGND at single point under IC |
| 11 BIAS | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND; auto-switches from SUP to OUT after startup |
| 12 FB | Feedback input | Connect to BIAS for fixed 3.3V/5V output; or to resistor divider for 0.8V–10V adjustable regulation |
| 13 OUT | Output voltage sense | Direct connection to regulated output rail; used with PGOOD monitoring and internal loop compensation |
| 14 VEA | Voltage-error amplifier output/input | Shared between controller/target in dual-phase; enables precise current sharing without external op-amps |
| 15 PGOOD | Open-drain power-good | Active-low signal with 0.4V max VOL at 1mA; requires external pull-up; debounced for noise immunity |
| 16 SYNC | Mode selection clock input | Pull to GND for skip mode; to BIAS for FPWM; accepts external clock up to 2.6MHz for synchronization |
| 17 SYNCOUT | 180° out-of-phase clock output | Drives target IC in dual-phase; disabled in skip mode; enables true interleaved operation with <5% current mismatch |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters through balanced hot-loop layout and integrated shielding |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz - lowers peak EMI emissions without affecting loop stability or output ripple |
| Dual-phase capability | Supports up to 8A combined output using two MAX26404AFOAY+ ICs with shared VEA and 180° SYNCOUT - eliminates need for external current-sharing ICs |
| MAXQ® power architecture | Delivers >65° phase margin and <10μs transient recovery time - enables stable operation with low-ESR ceramic output caps only |
| Ultra-low IQ in skip mode | 10μA total supply current at no load - reduces standby power in always-on telematics and ADAS modules |
| Robust protection suite | Includes hiccup-mode short-circuit response, thermal shutdown at 165°C, and overcurrent limiting with ±2.3A negative current threshold |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers SoC, display interface, and audio codec in head-unit systems operating from 9V–16V battery with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Primary 3.3V/5V POL regulator delivering 4A with 99% duty cycle during cranking; PGOOD sequences SoC boot. Use Value: Maintains regulation during 6V battery dips without brownout; 2.1MHz switching avoids AM radio interference in cabin. |
Use Scenario: Supplies 5V to isolated digital I/O channels and fieldbus transceivers in DIN-rail mounted PLCs with 24V DC input. IC Role / Device Role / Timing Role: High-efficiency, low-EMI buck stage upstream of isolated DC-DC converters; operates in FPWM mode for constant noise profile. Use Value: Meets EN 55032 Class A conducted/radiated EMI limits without ferrite beads or shielding cans; -40°C to +125°C rating ensures reliability in cabinet environments. |
| Telecom Remote Radio Unit | Medical Point-of-Care Monitor |
|
Use Scenario: Generates 5V for FPGA, ADC, and RF front-end in outdoor small-cell RRUs powered from 48V PoE-derived 24V rail. IC Role / Device Role / Timing Role: First-stage buck converting 24V to 5V; dual-phase configured with second MAX26404AFOAY+ for 8A total; SYNCOUT synchronizes phases. Use Value: Achieves <5% inter-phase current imbalance across temperature and load; spread spectrum passes FCC Part 15B radiated emissions. |
Use Scenario: Provides ultra-low-noise 3.3V supply to precision analog front-end and touch-screen controller in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-ripple, low-EMI POL regulator with 10μA skip-mode IQ; PGOOD enables safe shutdown before battery depletion. Use Value: Output voltage ripple <5mVpp enables 16-bit ADC accuracy; 3.5mm × 3.75mm footprint saves space in compact handheld enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 42V input, 8A, 2.1MHz, but uses voltage-mode control and lacks spread-spectrum or dual-phase VEA interface | Higher current but less suitable for EMI-sensitive medical or automotive infotainment where Silent Switcher performance is required | Select LM61480RQWR only if higher output current is mandatory and EMI filtering budget allows external components |
| MPQ4436AGL-AEC1-Z | AEC-Q100 qualified, 36V/6A, 500kHz–2.2MHz adjustable frequency, but no integrated spread-spectrum or PGOOD with 94% threshold | Better automotive qualification coverage, yet lacks MAX26404AFOAY+'s 10μA skip-mode IQ and dual-phase current-sharing accuracy | Choose MPQ4436AGL-AEC1-Z for production automotive programs requiring full AEC-Q100 documentation, not just temperature rating |
Compared with LM61480RQWR and MPQ4436AGL-AEC1-Z, the MAX26404AFOAY+ uniquely combines ultra-low IQ, factory-enabled spread-spectrum, and hardware-supported dual-phase current sharing in a single 3.5mm × 3.75mm package-making it optimal for space-constrained, EMI-critical, and multi-rail automotive/industrial designs where system-level noise and standby power are primary constraints.
Availability
MAX26404AFOAY+ is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX26404AFOAY+ 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 MAX26404AFOAY+ belongs to Analog Devices' Silent Switcher® buck converter family, engineered specifically for EMI-sensitive applications demanding compact size, high efficiency, and automotive-grade reliability without external filtering.
FAQ
What is the maximum input voltage the MAX26404AFOAY+ can handle?
The MAX26404AFOAY+ has an absolute maximum input voltage rating of +42V on the SUP pin, with recommended operation from 3V to 36V. Its undervoltage lockout activates at 2.725V (falling) and releases at 3.025V (rising), ensuring clean startup from weak or fluctuating sources like automotive batteries during cranking events. This makes the MAX26404AFOAY+ suitable for 24V industrial and 12V automotive systems with wide transient margins.
Does the MAX26404AFOAY+ support adjustable output voltage?
Yes, the MAX26404AFOAY+ supports both fixed and adjustable outputs. Connect the FB pin directly to BIAS for factory-set 3.3V or 5.0V outputs. For custom voltages from 0.8V to 10V, use an external resistor divider from OUT to GND with RFB2 ≤ 100kΩ. The MAX26404AFOAY+'s internal 0.800V feedback reference ensures ±1% accuracy across temperature and load, eliminating need for trimming in most applications.
How does the MAX26404AFOAY+ achieve low EMI performance?
The MAX26404AFOAY+ achieves low EMI through three integrated techniques: Silent Switcher® architecture with symmetrical hot-loop layout and internal magnetic field cancellation, spread-spectrum frequency modulation (±3% around 2.1MHz), and FC2QFN-17 package with dual SUP/PGND pins and exposed thermal pad for optimal grounding. These features collectively reduce peak radiated emissions by >30dB compared to standard buck converters, enabling compliance with CISPR 25 Class 5 without additional shielding or filters.
Can the MAX26404AFOAY+ operate in dual-phase configuration?
Yes, the MAX26404AFOAY+ supports hardware-assisted dual-phase operation using the VEA and SYNCOUT pins. One IC acts as controller (driving SYNCOUT 180° out-of-phase), the other as target (SYNCOUT tied to BIAS). The VEA pins are connected to enable dynamic current sharing with <5% mismatch across load and temperature. This allows 8A total output using two MAX26404AFOAY+ ICs without external current-sense amplifiers or master-slave controllers.
What protection features are built into the MAX26404AFOAY+?
The MAX26404AFOAY+ integrates overtemperature shutdown (165°C with 20°C hysteresis), hiccup-mode short-circuit protection (25ms off-time), overcurrent limiting (6.25A typical ILIM for MAX26404 variant), and input undervoltage lockout. It also monitors BIAS voltage with 1.58V UVLO and includes PGOOD with 94% rising threshold and 100μs debounce. These protections ensure robust operation in unregulated 12V/24V environments without external supervision circuits.
MAX26404AFOAY+ 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:
- 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+ FAQ
1.How can I place an order for MAX26404AFOAY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26404AFOAY+ 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+ reliable?
The price and inventory of MAX26404AFOAY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26404AFOAY+ is usually 5 days.
3.What payment methods are accepted for MAX26404AFOAY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26404AFOAY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26404AFOAY+?
MAX26404AFOAY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26404AFOAY+ 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+?
For technical support, including MAX26404AFOAY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26404AFOAY+ requirements.
6.How does Aetrix verify that MAX26404AFOAY+ is sourced from the original manufacturer or authorized distributors?
All MAX26404AFOAY+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX26404AFOAY+?
All MAX26404AFOAY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26404AFOAY+, 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+ part is unused and in its original packaging.
Return procedure for MAX26404AFOAY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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