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Analog Devices Inc./Maxim Integrated MAX26405AFOCY+T
- Part No.:
- MAX26405AFOCY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26405AFOCY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,591
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Product details
Overview
MAX26405AFOCY+T from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 5A continuous output current with 3V–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 operation-designed for automotive infotainment power rails and industrial 24V point-of-load regulation.
For engineers reviewing the MAX26405AFOCY+T datasheet, MAX26405AFOCY+T pinout, MAX26405AFOCY+T application, or MAX26405AFOCY+T equivalent, key selection criteria include its FC2QFN-17 package thermal performance (θJB = 10.2°C/W), ±1% output accuracy in FPWM mode, spread-spectrum EMI reduction, dual-phase VEA-based current sharing, and compatibility with 3.3V/5V fixed-output variants across the MAX26404/MAX26405/MAX26406 family.
Technical Context
The MAX26405AFOCY+T implements average current-mode control with internal slope compensation, enabling stable operation across wide VIN/VOUT ratios and high noise immunity. Its 33ns minimum on-time supports large step-down conversions (e.g., 24V→3.3V) without pulse skipping, while the MAXQ® power architecture delivers precise transient response and >60° phase margin.
Dual-phase capability is enabled via SYNCOUT (180° out-of-phase clock) and VEA (shared error amplifier node), supporting dynamic current sharing accuracy <±3% between phases. The device operates in forced-PWM or skip mode-selected by SYNC pin logic level-and includes hiccup-mode short-circuit protection with 25ms fault recovery timing.
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 rails without pre-regulation. |
| Output Current | 5A continuous - rated for sustained load in thermally constrained enclosures using JEDEC 4-layer board layout. |
| Switching Frequency | 2.1MHz fixed - enables use of sub-1µH inductors and <10µF ceramic output capacitors, minimizing solution size. |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on systems such as telematics or sensor hubs. |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable logic-level compliance for 5V I/O domains without external trimming. |
| Thermal Resistance θJB | 10.2°C/W - measured on EV kit 4-layer board; enables 5A operation up to +125°C ambient with <15°C junction rise. |
| PGOOD Threshold | 92–96% of VOUT - provides robust power-good assertion with 100μs debounce, preventing false resets during transients. |
Pinout & Package
MAX26405AFOCY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND). The symmetrical SUP/PGND pin arrangement minimizes loop area and enhances EMI performance per Silent Switcher® design principles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage compatible (up to 42V); pulls device into shutdown (4μA IQ) when low; activates BIAS regulator upon rising edge. |
| 2 BST | Bootstrap supply | Requires 0.1μF capacitor to LX; powers high-side gate driver; critical for MOSFET turn-on integrity above 12V VIN. |
| 3,9 SUP | Main supply input | Dual-input pins reduce IR drop and improve high-frequency decoupling; connect 1μF + 4.7μF ceramic caps to PGND. |
| 4,5,7,8 PGND | Power ground return | Four dedicated low-impedance paths for LX current return; 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; requires tight layout to minimize EMI and voltage spikes. |
| 10 GND | Analog ground | Separate from PGND; reference for FB, VEA, and internal error amplifier; connects to thermal pad for thermal conduction. |
| 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 if VOUT > 2.5V. |
| 12 FB | Feedback input | Connected to BIAS for fixed 5V output; accepts resistor divider for adjustable 0.8V–10V outputs; 800mV regulation threshold. |
| 13 OUT | Output voltage sense | Direct connection to regulated output; used with FB for remote sensing; improves load regulation under PCB trace resistance. |
| 14 VEA | Voltage error amplifier output | Shared between controller/target in dual-phase; enables precise current sharing; leave floating in single-phase configuration. |
| 15 PGOOD | Open-drain power-good | Asserts when VOUT reaches 92–96% of target; requires external pull-up; debounced for 100μs rising / 50μs falling edge. |
| 16 SYNC | Mode control & sync input | Pull to GND for skip mode; pull to BIAS for forced-PWM; accepts external clock up to 2.6MHz for synchronized multi-rail systems. |
| 17 SYNCOUT | 180° out-of-phase clock | Active only in FPWM mode; drives second phase in dual-converter setup; disabled in skip mode to reduce standby IQ. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck ICs through balanced, symmetrical power loops and integrated hot-loop capacitors. |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz (or 400kHz); lowers peak EMI emissions without affecting loop stability or transient response. |
| Dual-phase current sharing | Dynamic sharing accuracy <±3% across load steps via shared VEA node; eliminates need for external current-sense resistors or amplifiers. |
| Ultra-low IQ skip mode | 10μA no-load quiescent current with automatic transition from FPWM; maintains regulation while minimizing standby power in always-on systems. |
| Robust protection suite | Includes hiccup-mode short-circuit response (25ms off-time), overtemperature shutdown (165°C), and 99% dropout operation for brownout resilience. |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and upstream supplies; programmable soft-start not supported on this variant. |
Applications
| Automotive Infotainment Power Rail | Industrial 24V Point-of-Load Supply |
|---|---|
|
Use Scenario: Powers USB-C PD controllers, display timing controllers, and audio codecs in head units with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 5A peak current; provides PGOOD signal to MCU for safe boot sequencing. Use Value: 99% duty cycle enables stable 5V output even during cold-crank (6.5V battery), eliminating need for pre-buck stage. |
Use Scenario: Supplies FPGA I/O banks and microcontroller peripherals in PLC backplanes operating from 24V DC bus. IC Role / Device Role / Timing Role: Fixed-output 5V regulator with ±1% accuracy; PGOOD synchronizes FPGA configuration with power rail readiness. Use Value: 2.1MHz switching allows compact 1210-size inductors and 10µF X7R ceramics, reducing board area by >40% vs. 500kHz solutions. |
| Telecom Line Card Bias Supply | Medical Imaging Sensor Interface |
|
Use Scenario: Generates clean 5V bias for high-speed SERDES transceivers and clock buffers in 1RU telecom switches. IC Role / Device Role / Timing Role: Low-EMI buck converter operating in forced-PWM mode; SYNC pin tied to BIAS to suppress light-load frequency variation. Use Value: Spread-spectrum + symmetrical FC2QFN layout meets CISPR 32 Class B radiated emissions limits without shielding cans. |
Use Scenario: Powers analog front-end ASICs and precision ADC drivers in portable ultrasound probes with battery + adapter input. IC Role / Device Role / Timing Role: Dual-phase configured MAX26405AFOCY+T pair delivers 10A total with matched current sharing for parallel sensor channels. Use Value: VEA-coupled current sharing ensures <±2% inter-channel current mismatch during dynamic imaging bursts, preserving SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX26404AFOCY+T | 4A rated output current; identical pinout, package, and feature set except lower ILIM threshold (6.25A typ vs. 7.5A). | Better suited for space-constrained 4A loads where thermal margin is sufficient; shares same PCB layout and firmware interface. | Select when 4A continuous current suffices and cost optimization is prioritized over headroom. |
| MAX26406AFOCY+T | 6A rated output current; higher ILIM (8.75A typ) and RDSON_LS (22–44mΩ vs. 22–44mΩ - same spec range but tighter binning). | Required for 5.5–6A sustained loads in high-ambient environments; same footprint enables upgrade path without layout change. | Select when future-proofing for higher current or operating near thermal limits at +105°C ambient. |
Compared with MAX26405AFOCY+T, the MAX26404AFOCY+T offers lower cost and reduced thermal stress at 4A loads, while the MAX26406AFOCY+T provides additional current headroom and improved current-limit consistency-both retain identical control architecture, pinout, and dual-phase interoperability.
Availability
MAX26405AFOCY+T is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V point-of-load, and telecom line card power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX26405AFOCY+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 since 1965.
The MAX26404/MAX26405/MAX26406 family belongs to Analog Devices' Silent Switcher® power portfolio, engineered specifically for EMI-sensitive applications demanding compact, high-efficiency DC-DC conversion without shielding or complex filtering.
FAQ
What is the maximum continuous output current rating for MAX26405AFOCY+T?
The MAX26405AFOCY+T is rated for 5A continuous output current under recommended operating conditions (TA ≤ +125°C, 4-layer EV kit layout). This rating assumes proper thermal management using the exposed thermal pad and adheres to the 10.2°C/W θJB value specified in the datasheet. Derating applies above +125°C ambient or with less optimal board layouts.
Does MAX26405AFOCY+T support adjustable output voltages, or is it fixed-output only?
The MAX26405AFOCY+T supports both configurations: it ships with a fixed 5V output when FB is connected to BIAS, per its ordering option suffix "A" (5V fixed). For adjustable outputs from 0.8V to 10V, reconfigure FB with an external resistor divider from OUT to GND - the IC's 800mV feedback reference remains unchanged regardless of output setting.
Can MAX26405AFOCY+T be used in a dual-phase configuration, and what pins enable that?
Yes, MAX26405AFOCY+T supports dual-phase operation using SYNCOUT (pin 17) and VEA (pin 14). One device acts as controller (SYNC tied to BIAS), generating a 180° out-of-phase clock on SYNCOUT; the second acts as target (SYNCOUT connected to BIAS), with VEA pins interconnected to enforce dynamic current sharing. Both devices must operate in forced-PWM mode.
What is the purpose of the BST pin on MAX26405AFOCY+T, and what capacitor value is required?
The BST pin on MAX26405AFOCY+T supplies the high-side gate driver via a bootstrap capacitor connected between BST and LX. A 0.1μF ceramic capacitor (X7R, 16V rating) is required and must be placed as close as possible to pins 2 and 6. Incorrect BST capacitance or placement causes high-side FET turn-on failure and potential device latch-up under heavy load.
How does MAX26405AFOCY+T handle short-circuit conditions, and is hiccup mode enabled by default?
MAX26405AFOCY+T responds to hard shorts with automatic hiccup mode: when VOUT drops below 50% of target while in current limit, the device disables switching for 25ms, then re-attempts soft-start. This cycle repeats until the fault clears. Hiccup mode is inherent and cannot be disabled; it protects both the IC and external components during sustained overloads.
MAX26405AFOCY+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:
- 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)
MAX26405AFOCY+T FAQ
1.How can I place an order for MAX26405AFOCY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26405AFOCY+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 MAX26405AFOCY+T reliable?
The price and inventory of MAX26405AFOCY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26405AFOCY+T is usually 5 days.
3.What payment methods are accepted for MAX26405AFOCY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26405AFOCY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26405AFOCY+T?
MAX26405AFOCY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26405AFOCY+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 MAX26405AFOCY+T?
For technical support, including MAX26405AFOCY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26405AFOCY+T requirements.
6.How does Aetrix verify that MAX26405AFOCY+T is sourced from the original manufacturer or authorized distributors?
All MAX26405AFOCY+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 MAX26405AFOCY+T meets industry standards.
7.What is the process for return or replacement of MAX26405AFOCY+T?
All MAX26405AFOCY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26405AFOCY+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 MAX26405AFOCY+T part is unused and in its original packaging.
Return procedure for MAX26405AFOCY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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