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Analog Devices Inc./Maxim Integrated MAX26405AFODY+
- Part No.:
- MAX26405AFODY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26405AFODY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX26405AFODY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 5A continuous output current with 3V to 36V input range and fixed 5V output. It features 2.1MHz switching frequency, 10μA no-load quiescent current in skip mode, PGOOD monitoring, and 99% dropout capability - designed for automotive infotainment power rails and industrial 24V point-of-load regulation.
For engineers reviewing the MAX26405AFODY+ datasheet, MAX26405AFODY+ pinout, MAX26405AFODY+ application, or MAX26405AFODY+ equivalent, key selection criteria include its FC2QFN-17 package thermal performance (θJB = 10.2°C/W), dual-phase VEA-based current sharing, spread-spectrum EMI reduction, and fixed 5V/3.3V output variants with ±1% accuracy in FPWM mode.
Technical Context
The MAX26405AFODY+ 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 cycle skipping, while the MAXQ® power architecture delivers precise transient response and phase margin optimization.
Dual-phase operation is enabled via SYNCOUT (180° out-of-phase clock) and VEA (shared error amplifier node), supporting dynamic current sharing between controller and target ICs. The device operates exclusively in forced-PWM mode during multiphase configuration and disables spread spectrum when synchronized externally.
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 | 5A continuous - rated for MAX26405 variant; enables single-chip 5V/5A PoL for FPGA I/O or microcontroller core supplies. |
| Switching Frequency | 2.1MHz (fixed) - allows use of sub-1μH inductors and compact 0603 ceramic input capacitors, minimizing board area. |
| Quiescent Current | 10μA at no load (skip mode) - extends battery runtime in always-on automotive modules and IoT edge nodes. |
| Output Accuracy | ±1% at no load (FPWM mode) - ensures reliable logic-level compliance for 5V-tolerant interfaces and analog sensor biasing. |
| Thermal Resistance θJB | 10.2°C/W (EV kit) - enables >4W dissipation at ΔT = 40°C with standard 4-layer PCB, supporting full 5A load at +85°C ambient. |
| PGOOD Threshold | 92–96% of VOUT rising - provides precise power-good assertion for sequenced startup in multi-rail systems. |
Pinout & Package
MAX26405AFODY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND). Symmetrical SUP/PGND layout minimizes loop inductance and enhances EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage compatible (up to 42V); pulls device into shutdown (4μA IQ) when low. |
| 2 BST | Bootstrap supply | Requires 0.1μF capacitor to LX; powers high-side gate driver for efficient 100% duty-cycle operation. |
| 3,9 SUP | Main power input | Dual pins reduce IR drop and improve thermal spreading; connect 4.7μF + 1μF ceramic caps for low ripple. |
| 4,5,7,8 PGND | Power ground | Four dedicated PGND pins minimize ground bounce and support high-current return paths for LX switching. |
| 6 LX | Switch node | Connects to inductor; handles peak currents up to 6A RMS; requires tight layout to minimize EMI. |
| 10 GND | Analog ground | Separate AGND reference for FB/VEA/PGOOD; must be connected to PGND at single point near thermal pad. |
| 11 BIAS | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND; used to set fixed 5V/3.3V via FB connection. |
| 12 FB | Feedback input | Connect to BIAS for fixed 5V output; or use resistor divider (RFB1/RFB2) for adjustable 0.8V–10V regulation. |
| 13 OUT | Output voltage sense | Direct connection to regulated output; enables accurate remote sensing and PGOOD monitoring. |
| 14 VEA | Voltage error amplifier output/input | Controller: drives target VEA; Target: receives controller VEA for precise current sharing in dual-phase mode. |
| 15 PGOOD | Open-drain power-good | Asserts after soft-start and VOUT reaches 92–96%; requires external pull-up for system reset sequencing. |
| 16 SYNC | Mode select/clock input | Pull to BIAS for FPWM; pull to GND for skip mode; accept external clock (360kHz–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 configuration; disabled in skip mode. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters through balanced, symmetrical power loops. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1MHz (or 400kHz) lowers peak EMI emissions without affecting regulation. |
| Dual-phase current sharing | VEA-coupled architecture achieves <±3% current mismatch between phases under transient and steady-state loads. |
| 99% maximum duty cycle | Enables operation with VIN as low as 5.05V for 5V output - critical for automotive cold-crank (6V) and brownout conditions. |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and downstream circuits during power-up sequencing. |
Applications
| Automotive Infotainment Power | Industrial 24V Point-of-Load |
|---|---|
Use Scenario: Powering display controllers, audio codecs, and USB hubs in head units with 12V battery input and strict CISPR-25 Class 5 EMI limits. IC Role / Device Role / Timing Role: Primary 5V/5A buck regulator with PGOOD signaling for MCU-controlled power sequencing and fault reporting. Use Value: Silent Switcher® EMI suppression eliminates need for ferrite beads or metal shielding, reducing BOM cost and board space by >15%. | Use Scenario: Generating clean 5V rail for PLC I/O modules operating from unregulated 24V industrial bus with wide temperature (-40°C to +125°C) requirements. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC converter with 99% dropout and thermal shutdown (165°C) for field-deployed equipment. Use Value: 10.2°C/W θJB enables full 5A load at +85°C ambient on standard FR4, avoiding costly heatsinks or airflow design. |
| Telecom Base Station Subsystem | Networking Equipment PoL |
Use Scenario: Providing isolated 5V supply to RF front-end bias circuits in small-cell base stations where EMI must not interfere with LTE/5G signal integrity. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum-enabled buck converter synchronized to system clock via SYNC pin to avoid beat frequencies. Use Value: ±3% spread spectrum reduces narrowband EMI peaks below FCC Part 15 limits without degrading transient response. | Use Scenario: Delivering 5V/5A to switch fabric ASICs in 1U rack-mounted switches with dense component layout and limited airflow. IC Role / Device Role / Timing Role: Dual-phase configured pair (controller + target) delivering 10A total with matched current sharing and shared soft-start timing. Use Value: VEA-coupled architecture ensures <±3% current imbalance across phases, preventing thermal runaway and extending MOSFET lifetime. |
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, no spread spectrum, larger 16-pin WQFN (4mm × 4mm) | Lacks Silent Switcher EMI performance; requires additional filtering for automotive CISPR-25 compliance | Select when higher output current (8A) is required and EMI is less constrained. |
| TPS54560RGTT | 3.5V–60V input, 5A output, 100kHz–2.5MHz adjustable frequency, no integrated spread spectrum or dual-phase support | Higher VIN max but lower efficiency at light load (55μA IQ); no VEA pin for current sharing | Select for ultra-wide input range (e.g., 48V telecom) where dual-phase and EMI are secondary concerns. |
Compared with LM61480RQR and TPS54560RGTT, MAX26405AFODY+ delivers superior EMI performance via Silent Switcher architecture and spread spectrum, enables precise dual-phase current sharing via VEA, and maintains 10μA IQ at no load - making it optimal for space-constrained, noise-sensitive automotive and industrial PoL designs.
Availability
MAX26405AFODY+ is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, telecom small-cell base stations, and networking switch fabric power supplies requiring stable component supply and long-term lifecycle support.
Supply support for MAX26405AFODY+ 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 MAX26404/MAX26405/MAX26406 family is part of Analog Devices' Silent Switcher® power portfolio, engineered specifically for EMI-sensitive applications demanding high efficiency, small size, and robust thermal performance in automotive and industrial environments.
FAQ
What output voltage does the MAX26405AFODY+ deliver?
The MAX26405AFODY+ is factory-configured for a fixed 5V output. This is achieved by internally connecting the FB pin to the 1.8V BIAS rail - no external resistor divider is needed. Output voltage accuracy is ±1% in forced-PWM mode at no load, ensuring compatibility with 5V-tolerant logic and analog peripherals. For other voltages, the MAX26404 (3.3V) or MAX26406 (adjustable) variants must be selected.
Does the MAX26405AFODY+ support dual-phase operation?
Yes, the MAX26405AFODY+ supports dual-phase operation using the VEA and SYNCOUT pins. One IC acts as controller (driving SYNCOUT), the other as target (receiving SYNCOUT and VEA feedback). This configuration enables up to 10A total output with <±3% current sharing accuracy. Dual-phase operation requires forced-PWM mode (SYNC tied to BIAS) and is not supported in skip mode.
What is the thermal performance of the MAX26405AFODY+ in real-world PCB layouts?
On a 4-layer evaluation board, the MAX26405AFODY+ exhibits θJB = 10.2°C/W. With proper thermal pad soldering and 4+ vias to inner ground planes, it dissipates over 4W at +85°C ambient while maintaining junction temperature below 125°C - sufficient for full 5A load. The FC2QFN package's symmetrical SUP/PGND layout further improves heat spreading versus conventional QFNs.
How does the MAX26405AFODY+ achieve low EMI without external filters?
The MAX26405AFODY+ integrates Analog Devices' Silent Switcher® architecture: two independent, tightly coupled input power loops with reversed current directions cancel magnetic fields, and a symmetrical FC2QFN pinout minimizes parasitic inductance. Combined with optional ±3% spread-spectrum modulation, this reduces peak radiated emissions by >30dB - eliminating need for ferrite beads or metal shields in most automotive and industrial designs.
Can the MAX26405AFODY+ operate with input voltage below 5V?
Yes - the MAX26405AFODY+ supports input voltages as low as 3V and can maintain regulation down to VIN = 5.05V (99% duty cycle) for its 5V output. This enables reliable operation during automotive cold-crank events (down to ~6V battery) and brownout conditions in industrial 12V systems. Below 3V, the device shuts down due to SUP UVLO (2.945V rising threshold).
MAX26405AFODY+ 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:
- 5A
- 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)
MAX26405AFODY+ FAQ
1.How can I place an order for MAX26405AFODY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26405AFODY+ 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 MAX26405AFODY+ reliable?
The price and inventory of MAX26405AFODY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26405AFODY+ is usually 5 days.
3.What payment methods are accepted for MAX26405AFODY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26405AFODY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26405AFODY+?
MAX26405AFODY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26405AFODY+ 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 MAX26405AFODY+?
For technical support, including MAX26405AFODY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26405AFODY+ requirements.
6.How does Aetrix verify that MAX26405AFODY+ is sourced from the original manufacturer or authorized distributors?
All MAX26405AFODY+ 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 MAX26405AFODY+ meets industry standards.
7.What is the process for return or replacement of MAX26405AFODY+?
All MAX26405AFODY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26405AFODY+, 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 MAX26405AFODY+ part is unused and in its original packaging.
Return procedure for MAX26405AFODY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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