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Analog Devices Inc./Maxim Integrated MAX26406AFODY+
- Part No.:
- MAX26406AFODY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26406AFODY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX26406AFODY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 6A continuous output current with 3V to 36V input voltage range. It features fixed 2.1MHz switching frequency, ±1% output voltage accuracy in FPWM mode, PGOOD monitoring, and 99% dropout operation - optimized for automotive infotainment power rails and industrial 24V point-of-load regulation.
For engineers reviewing the MAX26406AFODY+ datasheet, MAX26406AFODY+ pinout, MAX26406AFODY+ application, or MAX26406AFODY+ equivalent, key selection criteria include its 17-pin FC2QFN package, dual-phase current-sharing capability via VEA/SYNCOUT, spread-spectrum EMI reduction, and 10μA no-load quiescent current in skip mode.
Technical Context
This device implements average current-mode control with internal slope compensation, enabling high noise immunity and precise dynamic current sharing in dual-phase configurations. Its MAXQ® power architecture delivers >85% efficiency at 12VIN/5VOUT/6A and supports forced-PWM or automatic skip-mode operation via SYNC pin logic level.
The IC integrates high-side (45–90mΩ) and low-side (22–44mΩ) DMOS switches, a 1.8V BIAS regulator, and symmetrical FC2QFN thermal/EMI layout with dedicated PGND pins (pins 4,5,7,8) and VIN-supply pins (pins 3,9). Thermal shutdown activates at 165°C with 20°C hysteresis.
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 | 6A continuous - enables single-chip replacement of discrete 5A solutions in space-constrained PoL designs. |
| Switching Frequency | 2.1MHz (fixed) - allows use of sub-1µH inductors and <10µF ceramic output capacitors for compact footprint. |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on automotive modules (e.g., CAN gateway standby). |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable power delivery to precision analog circuits and ADC references. |
| Duty Cycle Max | 99% - maintains regulation down to VOUT = 0.99 × VIN, critical for cold-crank 6V automotive scenarios. |
| Thermal Range | −40°C to +125°C ambient - qualified for under-hood and factory-floor industrial environments. |
Pinout & Package
MAX26406AFODY+ uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (PGND-connected) and symmetrical pin arrangement for optimal EMI suppression and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | High-voltage compatible (up to 42V); pulls device into 4μA shutdown when low - enables system-level power sequencing. |
| BST (Pin 2) | Bootstrap supply | Requires 0.1μF capacitor between BST and LX to drive high-side FET gate - critical for stable 99% duty-cycle operation. |
| SUP (Pins 3,9) | Main power input | Dual-input configuration reduces high-frequency input ripple and improves EMI performance - connect bulk + ceramic caps here. |
| PGND (Pins 4,5,7,8) | Power ground return | Four dedicated low-impedance paths minimize ground bounce and improve current-sense accuracy during 6A transients. |
| LX (Pin 6) | Switch node | Connects to inductor switch node; handles 6A RMS current - requires tight layout to minimize parasitic inductance and EMI. |
| GND (Pin 10) | Analog ground | Separate from PGND to isolate sensitive feedback and error amplifier circuitry from power switching noise. |
| BIAS (Pin 11) | Internal 1.8V LDO output | Powers internal logic; requires ≥2.2μF ceramic cap to GND - supplies FB reference and enables fixed-output mode when connected to FB. |
| FB (Pin 12) | Feedback input | 0.8V reference; connects to resistor divider for adjustable output or to BIAS for fixed 3.3V/5.0V - determines regulation setpoint with ±1% accuracy. |
| OUT (Pin 13) | Output voltage sense | Direct connection to regulated output rail - used by internal comparator for PGOOD generation and loop stability compensation. |
| VEA (Pin 14) | Voltage-error amplifier output/input | Shared between controller/target in dual-phase setups - enables precise current sharing (<±5% mismatch) without external components. |
| PGOOD (Pin 15) | Open-drain power-good flag | Asserts after soft-start and VOUT reaches 92–96% of target - provides system reset signaling with 100μs debounce. |
| SYNC (Pin 16) | Mode selection & sync input | Pull to GND for skip mode (10μA IQ); pull to BIAS for FPWM; accepts external clock up to 2.6MHz - controls light-load efficiency vs. EMI tradeoff. |
| SYNCOUT (Pin 17) | 180° out-of-phase clock output | Active only in FPWM mode; drives second phase in dual-phase configuration - eliminates need for external clock generator or delay networks. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters - meets CISPR 25 Class 5 without metal shielding. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1MHz - lowers peak EMI emissions to ease EMC certification in automotive systems. |
| Dual-phase capability | Enables 12A output using two MAX26406AFODY+ ICs with <5% current imbalance - avoids costly multi-phase controllers. |
| MAXQ® power architecture | Delivers >70° phase margin and fast transient response (<50μs recovery from 50% load step) - stabilizes sensitive RF and sensor power domains. |
| Robust protection suite | Includes hiccup-mode short-circuit protection, overtemperature shutdown (165°C), and input UVLO with hysteresis - prevents field failures in harsh environments. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering FPGA, DSP, and display interface ICs in head-unit systems with wide battery voltage swing (6V–16V). IC Role / Device Role / Timing Role: Primary 5V/6A PoL regulator with PGOOD sequencing and 99% dropout support for cold-crank conditions. Use Value: Eliminates need for pre-regulator stage; 10μA skip-mode IQ extends battery life during vehicle sleep mode. | Use Scenario: Generating isolated 3.3V logic supply for digital I/O cards in 24V-powered programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC stage feeding isolated DC-DC converters and microcontroller peripherals. Use Value: Symmetrical FC2QFN layout and spread spectrum meet EN 61000-6-4 industrial emission limits without added filtering. |
| Telecom Base Station Radio | Medical Imaging Sensor Bias |
Use Scenario: Providing clean 3.3V/6A supply to RF transceiver ASICs in small-cell base stations operating from 48V intermediate bus. IC Role / Device Role / Timing Role: Secondary buck stage with dual-phase option to scale to 12A for higher-density radio units. Use Value: VEA-based current sharing achieves <±3% imbalance across phases - maintains thermal balance and reliability under full load. | Use Scenario: Biasing high-resolution analog front-end sensors (e.g., CT/PET detector arrays) requiring ultra-low noise and tight voltage tolerance. IC Role / Device Role / Timing Role: Precision 5.0V regulator with ±1% accuracy and PGOOD monitoring for fault-tolerant medical power architecture. Use Value: MAXQ architecture suppresses switching noise below 100μVpp at 100kHz - preserves SNR in 24-bit ADC signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61460QWRNXTQ1 | 40V input, 6A, 2.1MHz, but lacks spread-spectrum and dual-phase VEA sharing; uses voltage-mode control. | Qualified for automotive AEC-Q100 Grade 1; no integrated BIAS LDO - requires external bias supply. | Choose when AEC-Q100 Grade 1 qualification is mandatory and dual-phase scaling is not required. |
| TPS546B24RVFT | 18V input max, 10A, PMBus-enabled, but requires external MOSFETs and controller IC; larger solution size. | Supports digital telemetry and dynamic voltage scaling; not suitable for 36V industrial inputs. | Choose when programmable telemetry, adaptive voltage scaling, or >6A single-phase output is needed. |
Compared with LM61460QWRNXTQ1 and TPS546B24RVFT, MAX26406AFODY+ uniquely combines 36V operation, integrated dual-phase current sharing, spread-spectrum EMI reduction, and 10μA skip-mode IQ in a 3.5mm × 3.75mm package - making it optimal for space-constrained, high-EMI automotive and industrial PoL designs where component count and thermal density are critical.
Availability
MAX26406AFODY+ is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, telecom radio units, and medical imaging sensor bias supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX26406AFODY+ 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 was designed specifically for high-density, low-EMI point-of-load power conversion in automotive and industrial environments where input voltage range, thermal robustness, and electromagnetic compatibility are critical.
FAQ
What is the maximum continuous output current supported by MAX26406AFODY+?
MAX26406AFODY+ supports 6A continuous output current under typical thermal conditions (TA ≤ +125°C, 4-layer PCB). This rating assumes proper layout with thermal vias to the PGND plane and use of recommended input/output capacitors. Derating applies above +70°C ambient per the 34.48mW/°C thermal coefficient specified in the datasheet.
Does MAX26406AFODY+ support fixed output voltages without external resistors?
Yes, MAX26406AFODY+ supports fixed 3.3V and 5.0V outputs by connecting the FB pin directly to the BIAS pin. The device also offers other factory-programmed fixed outputs from 2.9V to 6.0V in 100mV steps - confirmed in the Ordering Information table of the official datasheet. No external resistor divider is needed for these configurations.
How does the dual-phase operation work with MAX26406AFODY+?
MAX26406AFODY+ enables dual-phase operation using SYNCOUT (180° out-of-phase clock) and VEA (voltage-error amplifier) pins. One IC acts as controller (SYNC pulled high), the other as target (SYNCOUT connected to BIAS). Connecting VEA pins ensures dynamic current sharing with <±5% imbalance - verified in characterization data across temperature and load.
What is the purpose of the spread-spectrum feature in MAX26406AFODY+?
The spread-spectrum feature in MAX26406AFODY+ modulates the 2.1MHz switching frequency by ±3% using a 4.5kHz triangular waveform. This spreads EMI energy across a wider bandwidth, reducing peak radiated emissions by up to 10dB - critical for passing CISPR 25 Class 5 automotive EMC tests without additional shielding or filtering components.
Can MAX26406AFODY+ operate in dropout mode, and what is the minimum input voltage for 5V output?
Yes, MAX26406AFODY+ operates in dropout mode with up to 99% duty cycle. For a 5V output, the minimum input voltage is 5.05V (5V ÷ 0.99), enabling stable regulation during automotive cold-crank events where battery voltage drops to ~6V. This behavior is guaranteed across −40°C to +125°C ambient temperature.
MAX26406AFODY+ 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:
- 6A
- 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)
MAX26406AFODY+ FAQ
1.How can I place an order for MAX26406AFODY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26406AFODY+ 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 MAX26406AFODY+ reliable?
The price and inventory of MAX26406AFODY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26406AFODY+ is usually 5 days.
3.What payment methods are accepted for MAX26406AFODY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26406AFODY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26406AFODY+?
MAX26406AFODY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26406AFODY+ 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 MAX26406AFODY+?
For technical support, including MAX26406AFODY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26406AFODY+ requirements.
6.How does Aetrix verify that MAX26406AFODY+ is sourced from the original manufacturer or authorized distributors?
All MAX26406AFODY+ 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 MAX26406AFODY+ meets industry standards.
7.What is the process for return or replacement of MAX26406AFODY+?
All MAX26406AFODY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26406AFODY+, 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 MAX26406AFODY+ part is unused and in its original packaging.
Return procedure for MAX26406AFODY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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