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Analog Devices Inc./Maxim Integrated MAX26405AFOBY+T
- Part No.:
- MAX26405AFOBY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26405AFOBY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,757
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Product details
Overview
MAX26405AFOBY+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 MAX26405AFOBY+T datasheet, MAX26405AFOBY+T pinout, MAX26405AFOBY+T application, or MAX26405AFOBY+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 12V/24V industrial bus architectures.
Technical Context
This device implements average current-mode control with internal slope compensation, enabling robust noise immunity and precise dynamic current sharing in dual-phase configurations. Its architecture integrates high-side (45mΩ typ) and low-side (22mΩ typ) DMOS FETs, a 1.8V BIAS regulator, and a 2.5ms fixed soft-start ramp.
The MAX26405AFOBY+T supports forced-PWM or automatic skip-mode via SYNC pin logic, includes hiccup-mode short-circuit protection, and uses symmetrical FC2QFN pinout to minimize loop area and radiated EMI. Spread-spectrum modulation (±3% at 4.5kHz triangle wave) is factory-enabled and disabled only when synchronized to an external clock.
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 - matches MAX26405 variant rating per datasheet Table "High-Side DMOS Current-Limit Threshold". |
| Switching Frequency | 2.1MHz (fixed) - enables use of sub-1µH inductors and compact 0603 ceramic input capacitors. |
| Quiescent Current | 10μA at no load (skip mode) - extends battery runtime in always-on automotive modules. |
| Output Accuracy | ±1% at no load (FPWM mode) - ensures stable 5.00V ±50mV for USB-C PD sink controllers and MCU I/O rails. |
| Thermal Resistance θJB | 10.2°C/W (EV kit 4-layer board) - enables 5A operation at +125°C ambient with minimal heatsinking. |
| PGOOD Threshold | 94% VOUT rising (typ) - provides reliable power-good assertion for FPGA configuration sequencing. |
Pinout & Package
MAX26405AFOBY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND). The symmetrical layout minimizes high-di/dt loop area and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage compatible (up to 42V); pulls device into 4μA shutdown state when low. |
| 2 BST | Bootstrap supply | Requires 0.1μF ceramic capacitor between BST and LX to drive high-side FET gate. |
| 3,9 SUP | Main power input | Dual-supply pins reduce IR drop and improve EMI; connect ≥4.7μF ceramic + bulk cap. |
| 4,5,7,8 PGND | Power ground | Four dedicated PGND pins minimize ground bounce and support high-current return paths. |
| 6 LX | Switch node | Connects to inductor switch node; high impedance when off; drives both integrated FETs. |
| 10 GND | Analog ground | Separate AGND reference for feedback and error amplifier; tie to PGND at single point. |
| 11 BIAS | Internal 1.8V LDO output | Supplies internal circuitry; requires ≥2.2μF ceramic cap to PGND; powers FB divider for fixed 5V. |
| 12 FB | Feedback input | Connect to BIAS for fixed 5V output; for adjustable outputs, use resistor divider from OUT to GND. |
| 13 OUT | Output voltage sense | Direct connection to regulated output rail; used with PGOOD comparator and internal error amp. |
| 14 VEA | Voltage-error amplifier output | Shared between controller/target ICs in dual-phase setups to enforce matched current sharing. |
| 15 PGOOD | Open-drain power-good | Asserts after soft-start and VOUT reaches 94% of target; requires external pull-up to system rail. |
| 16 SYNC | Mode control | Pull to GND for skip mode; pull to BIAS for forced-PWM; accepts external clock up to 2.6MHz. |
| 17 SYNCOUT | 180° out-of-phase clock | Active only in FPWM mode; drives second phase in dual-phase configuration; open for single-phase. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces peak radiated EMI by >30dB vs conventional buck converters through balanced, low-loop-area layout. |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz lowers EMI peaks across CISPR 25 Class 5 limits without filtering. |
| Dual-phase current sharing | VEA pin coupling achieves <±3% current mismatch between phases under transient load steps. |
| 99% maximum duty cycle | Enables regulation down to VIN = VOUT × 1.01 - critical for automotive cold-crank (6.5V) into 5V rail. |
| Integrated 1.8V BIAS LDO | Eliminates need for external bias supply; auto-switches from SUP to VOUT after startup if VOUT > 2.5V. |
Applications
| Automotive Infotainment Power | Industrial 24V Point-of-Load |
|---|---|
|
Use Scenario: Powering display interface ASICs and audio codecs in head units with 12V battery input and strict CISPR 25 EMI limits. IC Role / Device Role / Timing Role: Primary 5V/5A buck regulator providing clean, low-noise supply with PGOOD sequencing for SoC boot. Use Value: Silent Switcher® + spread spectrum meets automotive EMI requirements without ferrite beads or shielding cans. |
Use Scenario: Generating 5V for PLC I/O modules operating from unregulated 24V industrial bus with wide temperature swing. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC stage delivering stable 5V at full load from -40°C to +125°C ambient. Use Value: 10.2°C/W θJB and 99% duty cycle ensure uninterrupted operation during brownouts and thermal stress. |
| Telecom Line Card Supply | Medical Diagnostic Imaging Sensor Bias |
|
Use Scenario: Compact 5V rail for Ethernet PHYs and SFP+ transceivers in space-constrained telecom line cards. IC Role / Device Role / Timing Role: Single-phase buck converter with 2.1MHz switching enabling <2mm² solution size including inductor. Use Value: Small 3.5mm × 3.75mm FC2QFN package and minimal external components reduce PCB footprint by 40% vs discrete solutions. |
Use Scenario: Low-noise 5V supply for CMOS image sensor biasing in portable ultrasound probes requiring ultra-low ripple. IC Role / Device Role / Timing Role: Fixed-output buck with PGOOD monitoring and ±1% accuracy ensuring consistent pixel response calibration. Use Value: 10μA skip-mode IQ and precision feedback enable battery-powered operation >12 hours without recharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX26404AFOBY+T | 4A rated output current; identical pinout, package, and feature set except lower ILIM threshold (6.25A max). | Better suited for cost-sensitive 4A applications where margin is acceptable; same PCB layout. | Select when 4A continuous load suffices and BOM cost optimization is prioritized over headroom. |
| MAX26406AFOBY+T | 6A rated output current; higher ILIM (8.75A typ); otherwise identical electrical and mechanical specifications. | Required for designs needing >5A sustained current or higher overload tolerance in automotive junction box modules. | Choose when future-proofing for 6A loads or operating near thermal limits in sealed enclosures. |
Compared with MAX26405AFOBY+T, the MAX26404AFOBY+T offers lower cost and reduced thermal margin at 4A, while the MAX26406AFOBY+T delivers higher current capability and improved overload resilience-both retain full pin-to-pin compatibility, dual-phase support, and Silent Switcher® EMI performance.
Availability
MAX26405AFOBY+T is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 24V PLCs, telecom line cards, and medical imaging sensors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26405AFOBY+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 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 automotive-grade reliability.
FAQ
What is the maximum continuous output current of the MAX26405AFOBY+T?
The MAX26405AFOBY+T is rated for 5A continuous output current, as confirmed by its current-limit threshold specification (7.5A min, 8.75A typ) and thermal characterization on 4-layer EV kit (θJB = 10.2°C/W). This rating applies across the full -40°C to +125°C operating temperature range with appropriate PCB copper area and airflow.
Does the MAX26405AFOBY+T support fixed 5V output without external resistors?
Yes, the MAX26405AFOBY+T supports fixed 5V output by connecting the FB pin directly to the BIAS pin (1.8V), as specified in the Applications Information section. This eliminates external resistor dividers and reduces BOM count while maintaining ±1% output accuracy in FPWM mode at no load.
Can the MAX26405AFOBY+T be used in dual-phase configurations?
Yes, the MAX26405AFOBY+T supports dual-phase operation using the VEA and SYNCOUT pins. When configured as a controller, it drives a target device with 180° out-of-phase clock and shared VEA for precise current balancing. Dual-phase mode is restricted to forced-PWM operation and requires separate FB connections for each IC.
What is the purpose of the spread-spectrum option in the MAX26405AFOBY+T?
The spread-spectrum option in the MAX26405AFOBY+T modulates the 2.1MHz switching frequency by ±3% using a 4.5kHz triangular waveform. This spreads EMI energy across a bandwidth instead of concentrating it at harmonics, helping the device meet stringent CISPR 25 Class 5 automotive emissions limits without additional filtering components.
How does the MAX26405AFOBY+T handle short-circuit conditions?
The MAX26405AFOBY+T employs hiccup-mode short-circuit protection: when output voltage drops below 50% of target during current limit, it disables switching for 25ms, then re-attempts soft-start. This prevents thermal runaway while limiting average power dissipation to safe levels during sustained faults.
MAX26405AFOBY+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 (3.3V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 5A
- Frequency - Switching:
- 2.1MHz
- 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)
MAX26405AFOBY+T FAQ
1.How can I place an order for MAX26405AFOBY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26405AFOBY+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 MAX26405AFOBY+T reliable?
The price and inventory of MAX26405AFOBY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26405AFOBY+T is usually 5 days.
3.What payment methods are accepted for MAX26405AFOBY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26405AFOBY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26405AFOBY+T?
MAX26405AFOBY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26405AFOBY+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 MAX26405AFOBY+T?
For technical support, including MAX26405AFOBY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26405AFOBY+T requirements.
6.How does Aetrix verify that MAX26405AFOBY+T is sourced from the original manufacturer or authorized distributors?
All MAX26405AFOBY+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 MAX26405AFOBY+T meets industry standards.
7.What is the process for return or replacement of MAX26405AFOBY+T?
All MAX26405AFOBY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26405AFOBY+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 MAX26405AFOBY+T part is unused and in its original packaging.
Return procedure for MAX26405AFOBY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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