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Analog Devices Inc./Maxim Integrated MAX26404AFOCY+T
- Part No.:
- MAX26404AFOCY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26404AFOCY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:2,421
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Product details
Overview
MAX26404AFOCY+T from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter with integrated high-side and low-side MOSFETs, delivering up to 4A continuous output current from a 3V–36V input. It features fixed 2.1MHz switching frequency, ±1% output voltage accuracy at no load, 10μA quiescent current in skip mode, and operates down to 99% duty cycle for automotive-grade dropout performance. It is used in point-of-load power supplies for industrial 24V systems.
For engineers reviewing the MAX26404AFOCY+T datasheet, MAX26404AFOCY+T pinout, MAX26404AFOCY+T application, or MAX26404AFOCY+T equivalent, key selection criteria include its 4A rating (distinct from MAX26405/MAX26406), FC2QFN-17 package thermal performance, spread-spectrum EMI reduction capability, and dual-phase VEA-based current sharing architecture.
Technical Context
The MAX26404AFOCY+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 integrates a 1.8V BIAS linear regulator with automatic switchover from SUP to OUT, a 2.5ms internal soft-start, and programmable PGOOD monitoring with 92–96% output voltage threshold. The device supports forced-PWM or skip-mode via SYNC pin logic level, and includes hiccup-mode short-circuit protection with 25ms fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery (12V/24V) and industrial rails without pre-regulation. |
| Output Current | 4A continuous - defined by MAX26404 variant's 5.5–7.0A current-limit threshold and thermal design in FC2QFN-17. |
| Switching Frequency | 2.1MHz (fixed) - enables compact 1.0μH inductor and low-profile ceramic output capacitors; avoids AM band interference. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on industrial sensors and telematics modules. |
| Output Voltage Accuracy | ±1% in FPWM mode at no load - ensures reliable power delivery to precision analog circuits and ADC references. |
| Duty Cycle Max | 99% - maintains regulation during cold-crank (e.g., 6V input → 5V output) without dropout in automotive applications. |
| Thermal Resistance θJA | 28.9°C/W (EV kit 4-layer) - enables 4A operation at +125°C ambient with minimal heatsinking in enclosed enclosures. |
Pinout & Package
MAX26404AFOCY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 = GND). The symmetrical SUP/PGND layout minimizes high-current loop area for ultra-low EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage compatible (up to 42V); pulls device into 4μA shutdown when low; activates BIAS regulator and soft-start sequence. |
| 2 BST | Bootstrap supply | Connects 0.1μF capacitor between BST and LX to drive high-side MOSFET gate; critical for proper high-side conduction. |
| 3,9 SUP | Main power input | Dual pins reduce IR drop and improve EMI; requires parallel 1μF + 4.7μF ceramic input capacitors per pin. |
| 4,5,7,8 PGND | Power ground | Four dedicated low-impedance paths for high di/dt return currents; must be tied directly to thermal pad and input/output caps. |
| 6 LX | Switch node | Connects to inductor switch node; carries full AC ripple current; layout must minimize parasitic inductance to suppress ringing. |
| 10 GND | Analog ground | Separate from PGND; reference for FB, VEA, PGOOD; connects to BIAS cap and signal return paths. |
| 11 BIAS | Internal 1.8V supply | Provides bias for 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 5V/3.3V output; or use resistor divider (RFB1/RFB2) for 0.8V–10V adjustable regulation. |
| 13 OUT | Output sense | Direct connection to regulated output rail; used with FB for remote sensing; improves load regulation under PCB trace resistance. |
| 14 VEA | Voltage error amplifier output | Used only in dual-phase configuration: connect controller VEA to target VEA for precise dynamic current sharing. |
| 15 PGOOD | Open-drain power-good | Active-low signal asserting when VOUT is within 92–96% of target; requires external pull-up; debounced with 100μs delay. |
| 16 SYNC | Mode select / sync input | Pull to BIAS for forced-PWM; pull to GND for skip mode; accept external clock (360kHz–2.6MHz) for synchronization. |
| 17 SYNCOUT | 180° out-of-phase clock | Drives second phase in dual-phase setup; disabled in skip mode; must be left open for single-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters through balanced, symmetrical power loops and integrated hot-loop capacitors. |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz reduces peak EMI emissions without affecting loop stability or output ripple. |
| Dual-phase current sharing | VEA pin coupling enables <±3% dynamic current mismatch between phases - critical for 8A+ high-reliability industrial power rails. |
| Ultra-low IQ in skip mode | 10μA no-load quiescent current extends runtime in battery-backed IoT edge nodes and always-on safety controllers. |
| 99% dropout operation | Maintains regulation at VIN as low as 5.05V for 5V output - meets ISO 16750-2 cold-crank requirements for automotive ECUs. |
| Integrated protection suite | Includes overtemperature shutdown (165°C), hiccup-mode short-circuit response, and input UVLO with 270mV hysteresis for robust field operation. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in under-hood BCM exposed to 40V load dump and -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 4A with 99% duty cycle support during cold-crank and spread-spectrum EMI suppression to meet CISPR 25 Class 5. Use Value: Eliminates need for external EMI filters and pre-regulators; reduces bill-of-materials by integrating FETs, drivers, and compensation. |
Use Scenario: Supplies isolated 3.3V logic rail for digital I/O modules in DIN-rail mounted PLCs operating from 24V DC industrial bus. IC Role / Device Role / Timing Role: Point-of-load regulator with PGOOD monitoring for system-level power sequencing and watchdog reset assertion. Use Value: Enables compact, fanless enclosure design via 28.9°C/W θJA and eliminates external current-sense resistors using integrated RDS(ON) sensing. |
| Telecom Remote Radio Unit (RRU) | Medical Infusion Pump Controller |
Use Scenario: Generates stable 5V supply for FPGA and RF front-end in outdoor 5G small-cell RRU with strict EMI limits and wide temperature range. IC Role / Device Role / Timing Role: Synchronous buck converter operating at 2.1MHz to avoid interference with LTE/5G bands; uses SYNCOUT for dual-phase scaling to 8A. Use Value: Meets EN 55032 Class A radiated emissions without shielding cans; supports dual-phase operation for higher power density. |
Use Scenario: Powers safety-critical ARM Cortex-M7 MCU and precision DAC in battery-operated infusion pump requiring long standby life and low-noise analog supply. IC Role / Device Role / Timing Role: Low-IQ buck regulator with skip-mode operation and 10μA quiescent current; provides clean 3.3V rail with ±1% accuracy for ADC reference. Use Value: Extends battery life beyond 72 hours in standby; PGOOD signal triggers firmware fault logging before brownout occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX26405AFOCY+T | 5A rated (7.5A current limit), identical pinout and features; higher RDS(ON) (HS: 45–90mΩ, LS: 22–44mΩ) but same thermal package. | Preferred where higher output current headroom is required without changing PCB layout or BOM footprint. | Select MAX26405AFOCY+T if peak load exceeds 4A or derating margin for 125°C operation is insufficient with MAX26404AFOCY+T. |
| LM61480RQR | 4A, 3V–36V, 2.1MHz, but lacks spread-spectrum, dual-phase VEA, and Silent Switcher EMI architecture; θJA = 42.5°C/W (JEDEC). | Suitable for cost-sensitive industrial applications where CISPR 25/EN 55032 compliance is not required. | Choose LM61480RQR only if EMI filtering budget allows external ferrites and layout constraints prevent optimal Silent Switcher layout. |
Compared with MAX26405AFOCY+T, the MAX26404AFOCY+T offers tighter current-limit tolerance and lower thermal resistance for 4A loads, while LM61480RQR trades EMI performance and dual-phase capability for lower unit cost and TI ecosystem support.
Availability
MAX26404AFOCY+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power rails, and telecom remote radio units requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26404AFOCY+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 industrial, automotive, communications, and healthcare markets.
The MAX26404AFOCY+T belongs to the MAX264xx Silent Switcher buck converter family, engineered for ultra-low EMI power conversion in space-constrained, noise-sensitive applications such as automotive ADAS and industrial IoT edge nodes.
FAQ
What is the maximum continuous output current of the MAX26404AFOCY+T?
The MAX26404AFOCY+T is rated for 4A continuous output current. This is confirmed by its MAX26404-specific current-limit threshold of 5.5–7.0A and thermal performance data showing 4A operation at +125°C ambient with 28.9°C/W θJA on a 4-layer EV kit board. Derating is required above +85°C ambient per the thermal characteristics table.
Does the MAX26404AFOCY+T support dual-phase operation, and how is it configured?
Yes, the MAX26404AFOCY+T supports dual-phase operation using the VEA and SYNCOUT pins. In a two-IC setup, one is configured as controller (SYNC pulled high) and the other as target (SYNC pulled low, SYNCOUT tied to BIAS). The controller's VEA pin connects to the target's VEA pin to enable dynamic current sharing with <±3% mismatch. Both ICs must use identical output voltage settings.
What is the purpose of the spread-spectrum option in the MAX26404AFOCY+T?
The spread-spectrum option in the MAX26404AFOCY+T modulates the 2.1MHz switching frequency by ±3% using a 4.5kHz triangular wave. This reduces peak radiated EMI emissions by spreading energy across a bandwidth, helping the device meet stringent standards like CISPR 25 Class 5 without external EMI filters. Spread spectrum is factory-enabled and disabled when synchronized to an external clock.
How does the PGOOD function work on the MAX26404AFOCY+T?
The MAX26404AFOCY+T asserts PGOOD low when the output voltage falls below 92–96% of the target (rising threshold) and releases it when VOUT rises above 91–95% (falling threshold). It features 100μs rising-edge debounce and 50μs falling-edge debounce. As an open-drain output, PGOOD requires an external pull-up resistor and is used for system power sequencing and fault detection in safety-critical designs.
Can the MAX26404AFOCY+T operate with a 5V input to generate a 3.3V output?
Yes, the MAX26404AFOCY+T supports 3V–36V input, making 5V-to-3.3V conversion fully valid. At 5V input, the duty cycle is ~66%, well within the 99% maximum. Output voltage accuracy remains ±1% in FPWM mode, and the device maintains stable operation down to light loads via skip mode with 10μA quiescent current - ideal for low-power microcontroller subsystems.
MAX26404AFOCY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Silent Switcher®
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- 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:
- 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)
MAX26404AFOCY+T FAQ
1.How can I place an order for MAX26404AFOCY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26404AFOCY+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 MAX26404AFOCY+T reliable?
The price and inventory of MAX26404AFOCY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26404AFOCY+T is usually 5 days.
3.What payment methods are accepted for MAX26404AFOCY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26404AFOCY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26404AFOCY+T?
MAX26404AFOCY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26404AFOCY+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 MAX26404AFOCY+T?
For technical support, including MAX26404AFOCY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26404AFOCY+T requirements.
6.How does Aetrix verify that MAX26404AFOCY+T is sourced from the original manufacturer or authorized distributors?
All MAX26404AFOCY+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 MAX26404AFOCY+T meets industry standards.
7.What is the process for return or replacement of MAX26404AFOCY+T?
All MAX26404AFOCY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26404AFOCY+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 MAX26404AFOCY+T part is unused and in its original packaging.
Return procedure for MAX26404AFOCY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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