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Analog Devices Inc./Maxim Integrated MAX42405AFOB+T
- Part No.:
- MAX42405AFOB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX42405AFOB+T.pdf
- Description:
- IC REG BUCK ADJ 6A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,951
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Product details
Overview
MAX42405AFOB+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 systems.
For engineers reviewing the MAX42405AFOB+T datasheet, MAX42405AFOB+T pinout, MAX42405AFOB+T application, or MAX42405AFOB+T equivalent, key selection considerations include dropout operation at >96% duty cycle, 20μA no-load quiescent current in skip mode, FC2QFN-17 thermal performance (θJA = 29°C/W on 4-layer board), and dual-phase current-sharing capability via VEA/SYNCOUT.
Technical Context
The MAX42405AFOB+T implements average current-mode control with 36ns minimum on-time, enabling stable high-step-down ratios without cycle skipping. Its architecture integrates a 1.8V BIAS regulator, internal soft-start (2.5ms), and symmetrical FC2QFN layout optimized for EMI reduction through balanced VIN/PGND routing.
It supports forced-PWM or automatic skip-mode operation via SYNC pin logic, delivers precise output regulation (±1.6% feedback accuracy), and features hiccup-mode short-circuit protection with 25ms/35ms off-time depending on switching frequency - all while maintaining operation across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial input rails including 24V DC systems with margin for transients. |
| Output Current | 5A continuous - rated for sustained load delivery with thermal derating per θJA = 29°C/W (4-layer board). |
| Switching Frequency | Fixed 400kHz - enables compact external components (e.g., 3.3µH inductor, 3×47µF 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 nodes. |
| Feedback Accuracy | ±1.6% (0.787V–0.813V at VFB) - ensures tight output regulation across temperature and line/load variations. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor heatsinking without latch-up. |
| PGOOD Threshold | 92–96% of VOUT rising - provides reliable power-good signaling for downstream sequencers or microcontrollers. |
Pinout & Package
MAX42405AFOB+T is housed in a 3.5mm × 3.75mm, 17-pin flip-chip quad flat no-lead (FC2QFN) package with symmetrical thermal and EMI-optimized layout. The exposed thermal pad is electrically connected to PGND and must be soldered to a large copper pour for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable Input | High-voltage-compatible activation signal; pulls device out of 4μA shutdown state when driven ≥1.2V. |
| 2 (BST) | Bootstrap Supply | Connects 0.1µF capacitor between BST and LX to bias high-side gate driver - critical for proper FET turn-on. |
| 3,9 (SUP) | IC Power Input | Dual-supply pins accept 4.5V–36V input; require parallel 1µF ceramic + 4.7µF bulk capacitor to PGND for stability. |
| 4,5,7,8 (PGND) | Power Ground | Low-impedance return path for high-current LX switching node; must be tied directly to thermal pad and input/output caps. |
| 6 (LX) | Switch Node | Drives external inductor; carries full 5A peak-to-peak ripple current - requires minimal trace area to reduce EMI. |
| 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 LDO Output | 1.8V regulated supply for internal circuitry; requires ≥2.2µF ceramic cap to PGND for noise immunity and startup stability. |
| 12 (FB) | Feedback Input | Senses resistor-divider ratio from OUT to set output voltage; leakage <100nA preserves accuracy with high-value dividers. |
| 13 (OUT) | Output Sense | Direct connection to regulated output rail - used with FB to close voltage loop; not a power output pin. |
| 14 (VEA) | Voltage Error Amplifier | Controller's error amp output or target's current-error input - enables precise dynamic current sharing in dual-phase setups. |
| 15 (PGOOD) | Open-Drain Status | Active-low reset signal with 0.4V max low-level voltage; requires external pull-up for system power sequencing. |
| 16 (SYNC) | Mode Control | Pull to GND for skip mode (low IQ); tie to BIAS for forced PWM - also accepts external clock up to 1.845MHz. |
| 17 (SYNCOUT) | Phase Clock Output | 180° out-of-phase clock for dual-phase synchronization; inactive in skip mode - enables 10A+ solutions with two ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical FC2QFN Layout | Matched VIN/PGND pin placement minimizes current-loop area and improves EMI by >6dB over standard QFN packages. |
| Average Current-Mode Control | Enables robust noise rejection in current-sense path and accurate dynamic load sharing in multiphase configurations. |
| Ultra-Low Dropout Operation | Supports >96% duty cycle - maintains regulation even when VIN drops within 0.5V of VOUT, critical for brownout resilience. |
| Integrated Dual-Phase Support | VEA and SYNCOUT pins allow seamless 2-phase stacking with <5% current mismatch - eliminates need for external controllers. |
| Thermal-Enhanced Packaging | θJC = 10.51°C/W on 4-layer EV kit - enables 5A operation at +70°C ambient without heatsink under typical PCB copper coverage. |
Applications
| Industrial PLC I/O Modules | Factory Automation Sensors |
|---|---|
Use Scenario: Powering isolated analog input/output channels in DIN-rail mounted programmable logic controllers with 24V DC input. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering stable 3.3V/5V to ADCs, DACs, and isolation drivers. Use Value: 20μA skip-mode IQ extends uptime during low-activity cycles; 36V input withstands 48V surge events per IEC 61000-4-5. |
Use Scenario: Supplying 5V to distributed IO-Link masters and smart field sensors operating in harsh factory environments. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage replacing discrete buck designs with external MOSFETs. Use Value: FC2QFN-17 package fits 8mm × 8mm board area; -40°C to +125°C rating ensures reliability inside sealed enclosures. |
| Ruggedized Edge Controllers | Distributed DC Power Systems |
Use Scenario: Providing 12V/5A power to ARM-based edge computing modules deployed in transportation or energy infrastructure. IC Role / Device Role / Timing Role: High-efficiency main rail converter supporting burst-mode processing loads with fast transient response. Use Value: 36ns min-on-time prevents subharmonic oscillation at 12V→3.3V conversion; PGOOD enables safe boot sequencing. |
Use Scenario: Building scalable 10A+ power rails using dual MAX42405AFOB+T in interleaved phase configuration. IC Role / Device Role / Timing Role: One IC acts as controller, second as target - synchronized via SYNCOUT/VEA for precise current balance. Use Value: Dual-phase operation cuts input/output ripple by 50% vs. single-phase; shared VEA achieves <3% current mismatch under load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42406AFOB+T | Higher current limit (7.5–10A vs. 6.5–8.5A); identical pinout, package, and feature set. | Preferred for 6A continuous or higher peak-load designs requiring additional headroom. | Select MAX42406AFOB+T when design margin demands >5A sustained output with same footprint and layout. |
| LM61480RQR | 4.5V–36V input, 8A rating, 2.1MHz fixed frequency; uses standard QFN-16, not FC2QFN. | Larger package (4mm × 4mm), higher fSW increases efficiency at light loads but raises EMI filtering complexity. | Choose LM61480RQR only if higher output current and faster transient response outweigh FC2QFN's EMI advantage. |
Compared with MAX42405AFOB+T, MAX42406AFOB+T offers increased current capability without layout change, while LM61480RQR trades superior thermal/EMI performance for higher peak current and frequency - making MAX42405AFOB+T optimal for space- and noise-sensitive 5A industrial rails.
Availability
MAX42405AFOB+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 manufacturability, and RoHS-compliant packaging.
Supply support for MAX42405AFOB+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 compact, high-reliability industrial DC-DC conversion - emphasizing thermal resilience, EMI robustness, and seamless dual-phase scalability in minimal PCB area.
FAQ
What is the maximum output current supported by the MAX42405AFOB+T?
The MAX42405AFOB+T is rated for 5A continuous output current under typical thermal conditions (θJA = 29°C/W on 4-layer board). Its high-side MOSFET has an RDSON_HS of 46mΩ (typ) and current-limit threshold of 6.5–8.5A, enabling reliable operation up to 5A with appropriate PCB copper and airflow. Derating applies above +70°C ambient.
Does the MAX42405AFOB+T support adjustable output voltage, and what is the range?
Yes, the MAX42405AFOB+T supports programmable output voltage via an external resistor divider on the FB pin. With 400kHz switching frequency, the output is adjustable from 0.8V to 12V. This range is confirmed in the Electrical Characteristics table and validated in typical application circuits showing 3.3V and 5V configurations.
How does the MAX42405AFOB+T handle thermal overload conditions?
The MAX42405AFOB+T incorporates thermal shutdown that activates at +175°C junction temperature, with 20°C hysteresis. When triggered, the converter disables switching and allows cooling before automatic recovery. This protection is independent of load current and operates across the full –40°C to +125°C ambient range, ensuring robustness in enclosed industrial enclosures.
Can the MAX42405AFOB+T be used in dual-phase configurations, and what pins enable this?
Yes, the MAX42405AFOB+T supports dual-phase operation using the VEA and SYNCOUT pins. In controller-target setup, SYNCOUT provides a 180° out-of-phase clock, while VEA connects controller error amplifier output to target current-error input - enabling precise current sharing (<5% mismatch) without external components. This capability is explicitly documented in the Multiphase Operation section.
What is the purpose of the BIAS pin on the MAX42405AFOB+T, and how should it be decoupled?
Pin 11 (BIAS) delivers a regulated 1.8V supply for internal circuitry. It must be decoupled with ≥2.2µF ceramic capacitor to PGND, placed adjacent to the pin. During startup, BIAS draws from SUP; once VOUT exceeds 2.5V, it switches to output-derived power - improving efficiency. Insufficient capacitance causes startup failure or instability, as specified in the Detailed Description section.
MAX42405AFOB+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)
MAX42405AFOB+T FAQ
1.How can I place an order for MAX42405AFOB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42405AFOB+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 MAX42405AFOB+T reliable?
The price and inventory of MAX42405AFOB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42405AFOB+T is usually 5 days.
3.What payment methods are accepted for MAX42405AFOB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42405AFOB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42405AFOB+T?
MAX42405AFOB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42405AFOB+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 MAX42405AFOB+T?
For technical support, including MAX42405AFOB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42405AFOB+T requirements.
6.How does Aetrix verify that MAX42405AFOB+T is sourced from the original manufacturer or authorized distributors?
All MAX42405AFOB+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 MAX42405AFOB+T meets industry standards.
7.What is the process for return or replacement of MAX42405AFOB+T?
All MAX42405AFOB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX42405AFOB+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 MAX42405AFOB+T part is unused and in its original packaging.
Return procedure for MAX42405AFOB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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