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Analog Devices Inc./Maxim Integrated MAX42405AFOA+T
- Part No.:
- MAX42405AFOA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX42405AFOA+T.pdf
- Description:
- IC REG BUCK ADJ 6A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,028
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Product details
Overview
MAX42405AFOA+T from Analog Devices is a fully integrated 36V, 5A synchronous buck converter with internal high-side and low-side MOSFETs, fixed 400kHz switching frequency, programmable 0.8V–12V output voltage, and PGOOD monitoring - designed for industrial point-of-load regulation in space-constrained 3.5mm × 3.75mm FC2QFN packages.
For engineers reviewing the MAX42405AFOA+T datasheet, MAX42405AFOA+T pinout, MAX42405AFOA+T application, or MAX42405AFOA+T equivalent, key selection considerations include its 20μA no-load quiescent current in skip mode, 96% maximum duty cycle for dropout operation, dual-phase capability via VEA/SYNCOUT, thermal shutdown at 175°C, and symmetrical FC2QFN layout for EMI optimization.
Technical Context
The MAX42405AFOA+T implements average current-mode control with internal slope compensation, enabling robust noise immunity and stable operation across wide input (4.5V–36V) and output (0.8V–12V) ranges. Its 36ns minimum on-time supports high step-down ratios without cycle skipping.
It features dual-phase architecture with shared VEA pin for precise dynamic current sharing, 180° out-of-phase SYNCOUT for multiphase timing, and dedicated BIAS regulator (1.8V) with automatic switchover from SUP to OUT during startup - all within a thermally enhanced 17-pin FC2QFN package with θJA = 29°C/W on four-layer board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial DC bus inputs including 12V, 24V, and 36V systems without external pre-regulation. |
| Output Current | 5A continuous - rated for sustained load delivery with thermal derating above +70°C ambient. |
| Switching Frequency | Fixed 400kHz - enables compact external components (e.g., 3.3µH inductor, 4×47µF output caps) and reduced output ripple. |
| Quiescent Current | 20μA at no load in skip mode - extends battery life or reduces standby power in always-on industrial systems. |
| Output Voltage Range | 0.8V to 12V programmable via resistor divider - covers core logic, FPGA I/O, and analog subsystem rails. |
| Duty Cycle Max | 96% - allows regulation down to VIN − 1.44V (e.g., 3.3V out from 4.5V in), critical for low-dropout industrial operation. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor heatsinking while enabling fast recovery. |
Pinout & Package
MAX42405AFOA+T is housed in a 3.5mm × 3.75mm, 17-pin flip-chip quad flat no-lead (FC2QFN) package with symmetrical VIN/PGND layout for optimized EMI performance and thermal dissipation (θJC = 10.51°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage-compatible (up to 42V) logic input; pulls low to enter 4μA shutdown state. |
| 2 BST | Bootstrap supply | Connects 0.1µF capacitor between BST and LX to drive high-side MOSFET gate above SUP rail. |
| 3,9 SUP | Main supply input | Accepts 4.5V–36V input; requires parallel 1µF ceramic + 4.7µF bulk capacitor for low ripple and EMI suppression. |
| 4,5,7,8 PGND | Power ground | Low-impedance return path for high-current LX switching; must be tied together and connected to input/output capacitors. |
| 6 LX | Switch node | Connects to inductor; carries full switching current (6A RMS); requires minimal trace area to reduce EMI and losses. |
| 10 GND | Analog ground | Reference for FB, VEA, and internal error amplifier; kept separate from PGND but connected at single point near BIAS. |
| 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 | Senses output via resistor divider; 0.787–0.813V regulation threshold ensures ±1.6% output accuracy over temperature. |
| 13 OUT | Output sense | Direct connection to regulated output rail; used with FB to set target voltage; not a power pin. |
| 14 VEA | Voltage error amplifier output | Provides controller's error signal to target IC in dual-phase mode; left floating for single-phase use. |
| 15 PGOOD | Open-drain power-good | Asserts when VOUT reaches 92–96% of target; requires external pull-up; debounced (100μs rise, 50μs fall at 400kHz). |
| 16 SYNC | Mode select / sync input | Pull to BIAS for forced PWM; pull to GND for skip mode; accepts external clock up to 1.845MHz for synchronization. |
| 17 SYNCOUT | 180° out-of-phase clock | Drives second phase in dual configuration; inactive in skip mode; enables precise interleaving without external timing IC. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables superior noise rejection in current loop and accurate dynamic current sharing in dual-phase configurations. |
| Symmetrical FC2QFN pinout | Reduces EMI by balancing high-di/dt paths across package; improves thermal spreading via copper underfill compatibility. |
| Internal soft-start | 2.5ms ramp time at 400kHz prevents inrush current and stabilizes startup into large capacitive loads. |
| Dual-phase support with VEA | Allows two MAX42405AFOA+T ICs to share load within ±3% current mismatch without external current-sense resistors. |
| Low-IQ skip mode | 20μA quiescent current at no load maintains efficiency in battery-backed or energy-sensitive industrial nodes. |
| Integrated protection suite | Includes overtemperature shutdown (175°C), hiccup-mode short-circuit response, and SUP/BIAS UVLO with hysteresis. |
Applications
| Industrial PLC I/O Modules | Factory Automation Sensors |
|---|---|
|
Use Scenario: Powering isolated digital I/O banks (24V input, 3.3V/5V logic rails) in programmable logic controllers with strict EMI limits. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 5A at 3.3V from 24V DC bus; provides PGOOD sequencing signal to FPGA configuration logic. Use Value: Symmetrical FC2QFN layout and average current-mode control meet CISPR-32 Class A conducted emissions requirements without added filtering. |
Use Scenario: Supplying precision analog front-ends (ADCs, transmitters) in distributed field sensors operating from 12–36V unregulated industrial power. IC Role / Device Role / Timing Role: Synchronous buck converter regulating 5V at 2A for sensor signal chain; uses internal 1.8V BIAS rail to power reference buffers. Use Value: 96% max duty cycle enables stable 5V output even at 12V input, eliminating need for cascaded pre-regulators and reducing bill-of-materials. |
| Motor Drive Auxiliary Supplies | Ruggedized Edge Computing Nodes |
|
Use Scenario: Generating gate-driver bias (12V @ 1A) and MCU core voltage (1.2V @ 1.5A) in servo drives exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: Dual-phase configuration using two MAX42405AFOA+T ICs to deliver 12A total with matched current sharing and thermal derating margin. Use Value: Shared VEA architecture achieves <±3% inter-phase current imbalance during torque transients, preventing MOSFET overstress. |
Use Scenario: Powering ARM-based edge controllers in oil & gas telemetry units requiring -40°C to +125°C operation and long-term reliability. IC Role / Device Role / Timing Role: Single-phase 400kHz buck supplying 1.1V core voltage to SoC; leverages 20μA skip-mode IQ to extend backup battery runtime. Use Value: Guaranteed 150,000-hour lifetime at TJ = +125°C per Analog Devices qualification ensures >10-year field deployment without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42406AFOA+T | Higher current limit (7.5–10A vs. 6.5–8.5A); same pinout, package, and feature set. | Preferred for 6A continuous designs with peak surge margin; identical layout and firmware integration. | Select MAX42406AFOA+T when design requires >5.5A sustained output with headroom for transient overloads. |
| LM61480RQR | 4.5–36V input, 8A rating, 2.1MHz fixed frequency; different pinout (16-pin QFN), no VEA dual-phase support. | Used where higher switching frequency enables smaller magnetics but dual-phase coordination is unnecessary. | Choose LM61480RQR only if PCB redesign is acceptable and 2.1MHz operation better suits size constraints than 400kHz. |
Compared with MAX42405AFOA+T, MAX42406AFOA+T offers higher current capability with zero layout change, while LM61480RQR trades dual-phase precision and EMI-optimized layout for higher frequency and raw current rating - making MAX42405AFOA+T optimal for thermally dense, multi-rail industrial modules requiring coordinated regulation.
Availability
MAX42405AFOA+T is available at Aetrix Electronics and suitable for industrial automation, point-of-load regulation, and distributed DC power systems requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX42405AFOA+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 MAX42405/MAX42406 family was engineered specifically for high-density industrial power conversion - emphasizing EMI resilience, dual-phase scalability, and extended temperature operation in compact FC2QFN packages.
FAQ
What is the maximum output current rating for MAX42405AFOA+T?
The MAX42405AFOA+T is rated for 5A continuous output current under typical thermal conditions (TA ≤ +70°C, four-layer board). Its LX current limit is 6.5–8.5A, and it supports 6A peak loads with appropriate thermal design. Derating applies above +70°C ambient, with junction temperature limited to +150°C per specifications.
Does MAX42405AFOA+T support dual-phase operation, and how is it configured?
Yes, MAX42405AFOA+T supports dual-phase operation using VEA and SYNCOUT pins. One IC acts as controller (SYNC tied to BIAS), the other as target (SYNCOUT connected to controller's SYNCOUT, VEA pins linked). This configuration enables precise current sharing and 10A+ total output without external current-sense circuitry.
What is the purpose of the BIAS pin on MAX42405AFOA+T, and what capacitor is required?
The BIAS pin delivers a regulated 1.8V supply for internal circuitry. A minimum 2.2µF ceramic capacitor must be placed between BIAS and PGND. During startup, BIAS draws from SUP; once VOUT exceeds 2.5V, it switches to output-derived power - improving efficiency in high-VIN, low-VOUT applications.
How does the PGOOD function work on MAX42405AFOA+T, and what is its threshold accuracy?
PGOOD on MAX42405AFOA+T is an open-drain output asserting when VOUT reaches 92–96% of the target voltage. Its rising-edge threshold is guaranteed 92–96% with 100μs debounce at 400kHz. It sinks ≥1mA at 0.4V low level and requires an external pull-up resistor to a compatible logic rail (e.g., 3.3V or 5V).
Can MAX42405AFOA+T operate in dropout, and what is the minimum input-to-output voltage difference supported?
Yes, MAX42405AFOA+T supports dropout operation with up to 96% duty cycle. At 3.3V output, it can regulate from as low as ~3.45V input (3.3V ÷ 0.96 ≈ 3.44V), enabling use in brownout conditions or post-dropper stages where input voltage approaches output voltage.
MAX42405AFOA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 6A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX42405AFOA+T FAQ
1.How can I place an order for MAX42405AFOA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42405AFOA+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 MAX42405AFOA+T reliable?
The price and inventory of MAX42405AFOA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42405AFOA+T is usually 5 days.
3.What payment methods are accepted for MAX42405AFOA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42405AFOA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42405AFOA+T?
MAX42405AFOA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42405AFOA+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 MAX42405AFOA+T?
For technical support, including MAX42405AFOA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42405AFOA+T requirements.
6.How does Aetrix verify that MAX42405AFOA+T is sourced from the original manufacturer or authorized distributors?
All MAX42405AFOA+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 MAX42405AFOA+T meets industry standards.
7.What is the process for return or replacement of MAX42405AFOA+T?
All MAX42405AFOA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX42405AFOA+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 MAX42405AFOA+T part is unused and in its original packaging.
Return procedure for MAX42405AFOA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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