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Analog Devices Inc./Maxim Integrated MAX42406AFOB+T
- Part No.:
- MAX42406AFOB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX42406AFOB+T.pdf
- Description:
- IC REG BUCK ADJ 6A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,115
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Product details
Overview
MAX42406AFOB+T from Analog Devices is a fully integrated 36V, 6A synchronous buck converter with internal high-side and low-side MOSFETs, fixed 400kHz/1.5MHz switching frequency, programmable 0.8V–10V output (at 1.5MHz), and PGOOD monitoring - designed for industrial point-of-load regulation in space-constrained systems.
For engineers reviewing the MAX42406AFOB+T datasheet, MAX42406AFOB+T pinout, MAX42406AFOB+T application, or MAX42406AFOB+T equivalent, key selection criteria include its 20μA no-load quiescent current in skip mode, dual-phase capability via VEA/SYNCOUT, symmetrical FC2QFN EMI-optimized layout, and dropout operation up to 96% duty cycle.
Technical Context
The MAX42406AFOB+T implements average current-mode control with internal slope compensation, enabling robust noise immunity and precise dynamic current sharing in dual-phase configurations. Its architecture supports forced-PWM and automatic skip-mode operation via the SYNC pin, with soft-start ramp times of 3.5ms (1.5MHz) and 2.5ms (400kHz).
It integrates a 1.8V BIAS linear regulator, internal 0.8V reference, and dedicated VEA pin for error-amplifier output sharing across phases. Thermal shutdown triggers at 175°C with 20°C hysteresis, and short-circuit protection employs hiccup mode with 25ms (400kHz) or 35ms (1.5MHz) off-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial input rails including 12V, 24V, and 36V systems without external pre-regulation. |
| Output Current | 6A continuous - rated per device; enables 12A dual-phase operation with matched current sharing via VEA pin. |
| Switching Frequency | Fixed 1.5MHz - reduces external component size (e.g., 1.2µH inductor, 4×22µF output caps) and output ripple. |
| Quiescent Current | 20μA at no load in skip mode - extends battery life in always-on industrial sensors and remote I/O modules. |
| Output Voltage Range | 0.8V to 10V (1.5MHz) - covers FPGA core, ASIC, and microcontroller supply requirements with external resistor-divider. |
| PGOOD Threshold | 92–96% of VOUT - provides accurate power-good signaling for system sequencing and fault detection. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| Package | 3.5mm × 3.75mm, 17-pin FC2QFN - ultra-compact footprint with symmetrical VIN/PGND layout for superior EMI performance. |
Pinout & Package
MAX42406AFOB+T uses a 3.5mm × 3.75mm, 17-pin flip-chip quad flat no-lead (FC2QFN) package with exposed thermal pad. Symmetrical SUP/PGND pin arrangement minimizes loop inductance and improves EMI behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage-compatible logic input; pulls device out of 4μA shutdown when driven ≥1.2V. |
| 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 4.7µF + ≥1µF ceramic capacitors for low-impedance filtering. |
| 4,5,7,8 PGND | Power ground | Low-impedance return path for high-current LX switching; must be tied together and connected to thermal pad. |
| 6 LX | Switch node | Connects directly to inductor; carries full 6A peak-to-peak switching current; high dv/dt node requiring tight layout. |
| 10 GND | Analog ground | Reference for FB, VEA, and internal circuits; isolated from PGND except at single-point connection. |
| 11 BIAS | Internal 1.8V regulator output | Powers internal circuitry; requires ≥2.2µF ceramic cap to PGND; supplies SYNC and VEA bias in dual-phase mode. |
| 12 FB | Feedback input | Senses output voltage via resistor divider; 0.8V internal reference enables precise regulation (±1.6% over temp). |
| 13 OUT | Output sense | Direct connection to regulated output; used with FB to set VOUT; supports remote sensing in high-current designs. |
| 14 VEA | Voltage error amplifier output/input | Controller: outputs error signal; Target: inputs shared error signal - enables accurate current sharing in dual-phase. |
| 15 PGOOD | Open-drain power-good | Asserts low when VOUT is within ±4% of target; requires external pull-up for system reset or sequencing logic. |
| 16 SYNC | Mode selection & sync input | Tied to BIAS = forced PWM; tied to GND = skip mode; accepts external clock up to 1.845MHz for synchronization. |
| 17 SYNCOUT | 180° out-of-phase clock output | Active only in FPWM mode; drives second phase in dual-phase configuration; open for single-phase use. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable operation under wide VIN/VOUT ratios and rejects noise on current-sense path without external compensation. |
| Dual-phase capability with VEA sharing | Supports 12A total output with <±3% current mismatch between phases - eliminates need for external current-sharing ICs. |
| Symmetrical FC2QFN package | Reduces common-mode EMI by balancing high-di/dt paths; measured θJA = 29°C/W on 4-layer EV kit board. |
| Ultra-low IQ skip mode | 20μA no-load quiescent current extends runtime in battery-backed PLC I/O modules and edge sensor nodes. |
| Integrated 1.8V BIAS regulator | Eliminates external LDO; powers internal logic and gate drivers; auto-switches from SUP to VOUT after startup if VOUT > 2.5V. |
| Hiccup-mode short-circuit protection | Shuts down for 25ms (400kHz) or 35ms (1.5MHz) during hard shorts - prevents thermal runaway while maintaining system awareness. |
Applications
| Industrial PLC Power Supply | Factory Automation I/O Module |
|---|---|
|
Use Scenario: Providing clean, regulated 3.3V/5V power to digital I/O channels, analog front-ends, and communication interfaces inside DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 6A at 3.3V from 24V DC bus; manages sequencing via PGOOD and EN. Use Value: Dropout operation at 96% duty cycle maintains regulation during brownouts; 20μA IQ extends backup battery life during standby. |
Use Scenario: Powering isolated CAN transceivers, ADCs, and microcontrollers in modular fieldbus I/O terminals operating in harsh factory environments. IC Role / Device Role / Timing Role: Synchronous buck converter with integrated FETs and EMI-optimized FC2QFN package - reduces BOM count and layout sensitivity. Use Value: Symmetrical pinout and thermal resistance (θJA = 29°C/W) enable reliable 6A operation without heatsinks in sealed enclosures. |
| Distributed DC Power Architecture | High-Current FPGA Core Supply |
|
Use Scenario: Local regulation at board-level for distributed 12V or 48V intermediate bus architectures in industrial servers and motion controllers. IC Role / Device Role / Timing Role: Single-phase 6A or dual-phase 12A buck controller supporting 0.8V–10V output with programmable soft-start (3.5ms @ 1.5MHz). Use Value: Dual-phase VEA coupling ensures <±3% current matching - avoids derating and enables scalable, compact multi-rail designs. |
Use Scenario: Delivering tightly regulated 0.85V core voltage to high-performance FPGAs in test equipment and embedded vision systems. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter with 1.5MHz switching and 0.8V feedback reference - meets FPGA transient response specs. Use Value: 36ns minimum on-time allows large step-down ratios (e.g., 12V→0.85V) without pulse-skipping instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42405AFOB+T | 5A rated (vs. 6A); identical pinout, package, and feature set; lower ILIM threshold (6.5–8.5A vs. 7.5–10A). | Suitable for lower-current loads where margin is acceptable; shares same PCB layout and firmware interface. | Select MAX42405AFOB+T when 5A output suffices and cost optimization is prioritized without sacrificing design reuse. |
| LM61460RQAR | 6A, 36V buck; 2.1MHz switching; different pinout (16-pin QFN); no VEA-based dual-phase support; higher IQ (26μA). | Lacks native dual-phase current sharing; requires external circuitry for multiphase operation; optimized for higher-frequency, smaller-inductor designs. | Choose LM61460RQAR only when 2.1MHz operation is mandatory and dual-phase scalability is not required. |
Compared with MAX42405AFOB+T, the MAX42406AFOB+T delivers higher current headroom and tighter current-limit tolerance; versus LM61460RQAR, it offers superior dual-phase integration and lower quiescent current but trades off maximum switching frequency.
Availability
MAX42406AFOB+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-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX42406AFOB+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 MAX42405/MAX42406 family is part of Analog Devices' high-density power management portfolio, engineered specifically for rugged, space-constrained industrial point-of-load applications demanding wide input range, low IQ, and seamless dual-phase scalability.
FAQ
What is the maximum output current rating for MAX42406AFOB+T?
The MAX42406AFOB+T is rated for 6A continuous output current under specified thermal conditions (θJA = 29°C/W on 4-layer board). Its high-side and low-side MOSFETs have typical RDS(ON) values of 46mΩ and 23mΩ respectively at 1.8V BIAS, enabling efficient 6A operation up to 125°C ambient. Derating applies above +70°C ambient per the 34.48mW/°C thermal spec.
Does MAX42406AFOB+T support dual-phase operation, and how is it implemented?
Yes, MAX42406AFOB+T supports dual-phase operation using the VEA and SYNCOUT pins. One device acts as controller (VEA output, SYNCOUT 180° out-of-phase), the other as target (VEA input, SYNCOUT unused). Connecting VEA pins ensures precise current sharing (<±3% mismatch), and SYNC must be tied to BIAS for FPWM mode. The architecture requires no external current-sense amplifiers or phase-control ICs.
What are the key differences between MAX42406AFOB+T and MAX42405AFOB+T?
The MAX42406AFOB+T is rated for 6A continuous output with a higher current-limit threshold (7.5–10A) versus the MAX42405AFOB+T's 5A rating and 6.5–8.5A limit. Both share identical pinout, package, features, and electrical characteristics otherwise - including 4.5V–36V input, 0.8V–10V output (1.5MHz), 20μA IQ, and FC2QFN footprint - making them drop-in replacements where current margin permits.
How does the PGOOD function work on MAX42406AFOB+T?
The PGOOD pin on MAX42406AFOB+T is an open-drain output that asserts low when the regulated output voltage falls outside 92–96% of the target value. It includes built-in debounce (140μs rising, 70μs falling at 1.5MHz) and requires an external pull-up resistor. This signal is used for system power sequencing, fault indication, and safe startup verification in industrial control systems.
What is the purpose of the SYNC pin on MAX42406AFOB+T?
The SYNC pin on MAX42406AFOB+T serves three functions: (1) selecting forced-PWM mode (tied to BIAS), (2) enabling skip mode for light-load efficiency (tied to GND), or (3) synchronizing to an external clock (360–1.845MHz). In dual-phase setups, SYNC must be high on the controller to activate SYNCOUT; skip mode disables SYNCOUT and halts phase synchronization.
MAX42406AFOB+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:
- 1.5MHz
- 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)
MAX42406AFOB+T FAQ
1.How can I place an order for MAX42406AFOB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42406AFOB+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 MAX42406AFOB+T reliable?
The price and inventory of MAX42406AFOB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42406AFOB+T is usually 5 days.
3.What payment methods are accepted for MAX42406AFOB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42406AFOB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42406AFOB+T?
MAX42406AFOB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42406AFOB+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 MAX42406AFOB+T?
For technical support, including MAX42406AFOB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42406AFOB+T requirements.
6.How does Aetrix verify that MAX42406AFOB+T is sourced from the original manufacturer or authorized distributors?
All MAX42406AFOB+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 MAX42406AFOB+T meets industry standards.
7.What is the process for return or replacement of MAX42406AFOB+T?
All MAX42406AFOB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX42406AFOB+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 MAX42406AFOB+T part is unused and in its original packaging.
Return procedure for MAX42406AFOB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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