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Analog Devices Inc./Maxim Integrated MAX26404AFOCY+
- Part No.:
- MAX26404AFOCY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26404AFOCY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
MAX26404AFOCY+ 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, 5V fixed output voltage, ±1% output accuracy in FPWM mode, and ultra-low 10μA quiescent current in skip mode-optimized for automotive point-of-load power in space-constrained, low-EMI systems.
For engineers reviewing the MAX26404AFOCY+ datasheet, MAX26404AFOCY+ pinout, MAX26404AFOCY+ application, or MAX26404AFOCY+ equivalent, key selection criteria include its 3.5mm × 3.75mm FC2QFN-17 package, PGOOD monitoring capability, dual-phase readiness via VEA/SYNCOUT, spread-spectrum EMI reduction option, and dropout operation at 99% duty cycle for 12V/24V industrial and automotive supply rails.
Technical Context
The MAX26404AFOCY+ implements average current-mode control with internal slope compensation, enabling robust noise immunity and precise dynamic current sharing in dual-phase configurations. Its MAXQ® power architecture delivers high phase margin and fast transient response while maintaining stability across wide VIN and load ranges.
It integrates a 1.8V BIAS linear regulator, supports forced-PWM or automatic skip-mode operation via SYNC pin logic, and includes comprehensive protection: overtemperature shutdown (165°C), hiccup-mode short-circuit protection, and input undervoltage lockout (2.945V rising). The device operates from –40°C to +125°C ambient and supports 99% duty-cycle dropout for low-VIN scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery (12V/24V) and industrial DC rails without pre-regulation. |
| Output Current | 4A continuous - rated for MAX26404 variant; enables compact single-phase POL supplies up to 20W at 5V. |
| Switching Frequency | 2.1MHz fixed - allows use of sub-1µH inductors and small ceramic capacitors, minimizing solution size and avoiding AM band interference. |
| Output Voltage | Fixed 5.0V ±1% - internally set; eliminates external feedback resistors and improves accuracy vs. adjustable solutions. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules and IoT edge nodes during standby. |
| Duty Cycle Max | 99% - sustains regulation down to VIN = VOUT + ~0.3V, critical for cold-crank automotive operation (e.g., 6V start with 5V output). |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off. |
Pinout & Package
MAX26404AFOCY+ is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND) for enhanced thermal performance and symmetrical VIN/PGND layout to minimize EMI loop area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage compatible (up to 42V); logic-high >1.2V activates converter; logic-low <0.5V places IC in 4μA shutdown. |
| 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 | Accepts 3V–36V; requires parallel 1μF ceramic + 4.7μF bulk capacitor to PGND for stable bias and low ripple. |
| 4,5,7,8 PGND | Power ground | Low-impedance return path for high-current LX switching node; must be tied directly to thermal pad and input/output caps. |
| 6 LX | Switch node | Connects to inductor; carries full switching current (up to 4A RMS); requires tight layout to minimize EMI and ringing. |
| 10 GND | Analog ground | Reference for FB, VEA, PGOOD; must be separated from PGND and connected at single point near BIAS capacitor. |
| 11 BIAS | Internal 1.8V LDO output | Supplies internal circuitry; requires ≥2.2μF ceramic cap to PGND; powers FB divider when configured for fixed 5V output. |
| 12 FB | Feedback input | Internally connected to BIAS for fixed 5V operation; open for adjustable outputs; leakage <100nA preserves light-load efficiency. |
| 13 OUT | Output voltage sense | Monitors regulated output; used with PGOOD to validate voltage quality; connects directly to output capacitor. |
| 14 VEA | Voltage error amplifier output | Enables dual-phase current sharing; connect to VEA of target IC; unused in single-phase configuration. |
| 15 PGOOD | Open-drain power-good | Asserts high when VOUT is within ±6% of target; 100μs debounce prevents false resets during transients. |
| 16 SYNC | Mode select / sync input | Pull to BIAS for forced-PWM; pull to GND for skip mode; accept external clock up to 2.6MHz for synchronized multi-rail systems. |
| 17 SYNCOUT | 180° out-of-phase clock | Provides timing reference for dual-phase operation; disabled in skip mode; must be left open for single-phase use. |
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 minimizes peak EMI emissions without affecting regulation or efficiency. |
| Dual-phase capability | Supports up to 8A combined output using two MAX26404AFOCY+ ICs with precise current sharing via shared VEA pin and SYNCOUT timing. |
| MAXQ® power architecture | Delivers >65° phase margin and <10μs transient recovery time under 2A step load, enabling stable operation with minimal output capacitance. |
| Ultra-low IQ in skip mode | 10μA no-load quiescent current enables >10-year battery life in always-on automotive telematics and sensor modules. |
| 99% dropout operation | Maintains regulation at VIN as low as 5.05V (for 5V output), satisfying automotive cold-crank requirements per ISO 16750-2. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 5V microcontroller, CAN transceiver, and display interface in head-unit under wide battery voltage range (6V–16V) and high ambient temperature. IC Role / Device Role / Timing Role: Primary 5V POL regulator with PGOOD sequencing, dropout support for cold-crank, and EMI compliance for CISPR 25 Class 5. Use Value: Eliminates need for external LDO post-regulator and reduces total BOM count by integrating FETs, controller, and compensation in one 3.5mm × 3.75mm package. |
Use Scenario: Generating stable 5V rail for digital I/O isolation, ADC reference, and FPGA configuration in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter operating from 24V DC bus with forced-PWM mode for consistent EMI profile during variable load cycles. Use Value: Achieves >92% efficiency at 3A load while meeting EN 55032 Class A conducted/radiated emissions without shielding or ferrites. |
| Telecom Remote Radio Unit | Medical Point-of-Care Monitor |
|
Use Scenario: Supplying 5V to RF front-end ASIC and clock distribution circuitry in outdoor 4G/5G small cell base stations with -40°C to +85°C operating range. IC Role / Device Role / Timing Role: Compact, thermally robust POL converter with 125°C junction rating and dual-phase scalability for future 10A upgrades. Use Value: Enables fanless thermal design via 10.4°C/W θJCB and reduces system footprint by 40% vs. discrete controller + DrMOS solution. |
Use Scenario: Providing clean, low-noise 5V power to analog front-end, touch controller, and Bluetooth LE radio in portable diagnostic devices powered by Li-ion battery. IC Role / Device Role / Timing Role: Ultra-low IQ buck regulator with skip-mode operation to extend battery runtime while maintaining PGOOD supervision for safe shutdown. Use Value: Delivers 10μA quiescent current and ±1% output accuracy-critical for precision ADC references and sensor signal integrity. |
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 output, 2.1MHz, fixed 5V option available; larger 4mm × 4mm WQFN-24 package; no spread-spectrum or dual-phase VEA support. | Better suited for higher-current single-rail designs; lacks integrated EMI optimization features and dual-phase synchronization capability. | Select LM61480RQR only if >4A output or lower RDS(on) is required; MAX26404AFOCY+ preferred for EMI-sensitive, space-constrained, or dual-phase scalable designs. |
| TPS546B24RVFT | 4.5V–18V input, 10A output, 500kHz–2.2MHz programmable frequency; supports PMBus; 5mm × 5mm VQFN-30; no integrated spread-spectrum or Silent Switcher topology. | Targeted at digitally controlled, high-current server POL; requires external compensation and telemetry components not needed with MAX26404AFOCY+. | Choose TPS546B24RVFT for systems requiring telemetry, dynamic voltage scaling, or >4A; MAX26404AFOCY+ offers simpler, smaller, lower-EMI solution for fixed 5V/4A needs. |
Compared with LM61480RQR and TPS546B24RVFT, the MAX26404AFOCY+ provides superior EMI performance in a smaller footprint, native dual-phase readiness, and lower quiescent current-making it optimal for automotive, industrial, and medical applications where board space, thermal constraints, and electromagnetic compatibility are critical.
Availability
MAX26404AFOCY+ is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, telecom remote radio units, and medical point-of-care monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX26404AFOCY+ 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 with precision power, signal chain, and RF solutions.
The MAX26404AFOCY+ belongs to Analog Devices' Silent Switcher® buck converter family, engineered specifically for low-EMI, high-density power conversion in automotive and industrial environments where reliability, thermal performance, and regulatory compliance are non-negotiable.
FAQ
What is the maximum input voltage rating for MAX26404AFOCY+?
The MAX26404AFOCY+ has an absolute maximum input voltage (SUP pin) rating of +42V, with recommended operation from 3V to 36V. This wide input range supports direct connection to 12V and 24V automotive and industrial buses, including cold-crank conditions down to 6V while maintaining 5V regulation via 99% duty-cycle operation.
Does MAX26404AFOCY+ require external feedback resistors to set the 5V output?
No. The MAX26404AFOCY+ is factory-configured for fixed 5V output; the FB pin is internally connected to the 1.8V BIAS rail, eliminating the need for external resistor dividers. This simplifies design, improves output accuracy to ±1%, and removes resistor tolerance and temperature drift errors inherent in adjustable configurations.
Can MAX26404AFOCY+ operate in dual-phase mode with another identical IC?
Yes. The MAX26404AFOCY+ supports dual-phase operation using its dedicated VEA and SYNCOUT pins. One IC acts as controller (SYNC pulled high), the other as target (SYNCOUT connected to BIAS); VEA pins are tied together to enable precise current sharing. This configuration scales output current to 8A while maintaining tight regulation and low EMI.
What thermal performance can be expected from MAX26404AFOCY+ on a standard 4-layer PCB?
On a JEDEC 4-layer board, the MAX26404AFOCY+ exhibits a junction-to-ambient thermal resistance (θJA) of 38.4°C/W and junction-to-board (θJB) of 9.9°C/W. With proper thermal pad soldering and copper pour, it sustains 4A continuous output at +125°C ambient without derating-validated per Analog Devices' EV kit data and thermal characterization reports.
Is spread-spectrum frequency modulation enabled by default on MAX26404AFOCY+?
No. Spread-spectrum modulation is a factory-configurable option; the standard MAX26404AFOCY+ does not include it unless explicitly ordered with the "-SS" suffix. When enabled, it modulates switching frequency by ±3% at 4.5kHz to reduce peak EMI emissions-particularly beneficial for automotive CISPR 25 compliance without added filtering components.
MAX26404AFOCY+ 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:
- 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+ FAQ
1.How can I place an order for MAX26404AFOCY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26404AFOCY+ 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+ reliable?
The price and inventory of MAX26404AFOCY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26404AFOCY+ is usually 5 days.
3.What payment methods are accepted for MAX26404AFOCY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26404AFOCY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26404AFOCY+?
MAX26404AFOCY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26404AFOCY+ 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+?
For technical support, including MAX26404AFOCY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26404AFOCY+ requirements.
6.How does Aetrix verify that MAX26404AFOCY+ is sourced from the original manufacturer or authorized distributors?
All MAX26404AFOCY+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX26404AFOCY+?
All MAX26404AFOCY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26404AFOCY+, 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+ part is unused and in its original packaging.
Return procedure for MAX26404AFOCY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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