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Analog Devices Inc./Maxim Integrated MAX42402AFLB+
- Part No.:
- MAX42402AFLB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-PowerWFQFN
- Datasheet:
-
MAX42402AFLB+.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:635
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Product details
Overview
MAX42402AFLB+ from Analog Devices is a fully integrated 36V, 2.5A synchronous buck converter in a 3mm × 3mm FC2QFN package, featuring 1.5MHz fixed switching frequency, 0.8V–12V programmable output, 27μA no-load quiescent current in skip mode, and 99% dropout duty cycle - designed for industrial point-of-load regulation where wide input range and compact footprint are critical.
For engineers reviewing the MAX42402AFLB+ datasheet, MAX42402AFLB+ pinout, MAX42402AFLB+ application, or MAX42402AFLB+ equivalent, key selection considerations include its 1.5MHz operation enabling small external magnetics, spread-spectrum EMI reduction, PGOOD monitoring with ±2.25% windowed accuracy, and thermal shutdown at 175°C with 15°C hysteresis.
Technical Context
The MAX42402AFLB+ implements average current-mode control with internal slope compensation, supporting stable operation across 4.5V–36V input while delivering up to 2.5A continuous output. Its 1.5MHz switching frequency (±125kHz tolerance) enables use of sub-3μH inductors and <50μF total output capacitance per typical design.
It integrates high-side (96–175mΩ) and low-side (46–90mΩ) DMOS FETs, a 1.8V BIAS LDO, and logic-level SYNC/SPS pins for forced-PWM/skip-mode selection and ±6% spread-spectrum modulation - all coordinated via a single internal oscillator without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports 24V industrial rails and automotive cold-crank transients up to 36V |
| Output Current | 2.5A continuous - sufficient for FPGA core rails, PLC I/O modules, and sensor signal chains |
| Switching Frequency | 1.5MHz ±125kHz - enables compact 2.2μH inductors and reduces EMI fundamental below 2MHz |
| Output Voltage Range | 0.8V to 12V adjustable - covers standard logic rails (1.2V, 1.8V, 3.3V, 5V) and analog supply needs |
| Quiescent Current | 27μA in skip mode - extends battery life in always-on industrial sensors and remote monitors |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + 0.36V, critical for 12V-to-12V "no-drop" applications |
| PGOOD Accuracy | ±2.25% UV/OV window - provides reliable power sequencing and fault detection in safety-critical systems |
| Operating Temp | −40°C to +125°C - qualified for extended temperature industrial and transportation environments |
Pinout & Package
Package: 15-pin FC2QFN (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed PGND pad. Pin count and layout optimized for symmetrical high-current paths and EMI cancellation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-tolerant (up to 42V); activates BIAS LDO and converter when >0.9V |
| SUP (pins 3,7) | High-side supply input | Power source for internal gate drivers; requires dual bypass (0.1μF + 2.2μF) per pin |
| PGND (pins 4,6,14) | Power ground | Low-impedance return for LX current; must be tied directly to GND under IC |
| LX | Switch node | Connects to inductor; carries full AC ripple current - minimize loop area for EMI control |
| BST | Bootstrap capacitor terminal | Requires 0.1μF ceramic between BST and LX to drive high-side FET gate above SUP |
| BIAS | 1.8V internal LDO output | Powers analog circuitry; requires ≥2.2μF ceramic to PGND for stability |
| SPS | Spread-spectrum enable | Logic-high enables ±6% triangular dither on fSW; disabled during external sync |
| FB | Voltage feedback input | 0.8V reference; sets output via resistor divider - leakage <100nA ensures accuracy |
| PGOOD | Open-drain status output | Active-high; pulls low if VOUT deviates >±2.25%; requires external pull-up to BIAS or VOUT |
| SYNC | Mode/frequency control | Low = skip mode; high = forced PWM; external clock input (1.215–1.845MHz) for synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | High-side (96–175mΩ) and low-side (46–90mΩ) DMOS FETs eliminate external MOSFETs and drivers |
| Ultra-Low Light-Load IQ | 27μA at no load - achieved via automatic skip-mode entry when SYNC = low |
| Fixed 1.5MHz Operation | No external timing components required; soft-start time fixed at 3.5ms for predictable startup behavior |
| Robust Protection Suite | Overcurrent (4.375–6.2A threshold), overtemperature (175°C shutdown), overvoltage, and hiccup-mode short-circuit response |
| EMI Mitigation | Spread-spectrum modulation (±6%) + symmetrical SUP/PGND pinout + internal slope compensation reduce radiated emissions |
| Industrial-Grade Reliability | Specified for −40°C to +125°C ambient; 150°C max junction temp rated for 5,000 hours continuous operation |
Applications
| Industrial PLC I/O Modules | Factory Automation Sensors |
|---|---|
Use Scenario: Powering isolated analog input/output channels in modular PLC backplanes with 24V DC field power. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24V field bus to precise 3.3V/5V for ADCs, DACs, and digital isolators. Use Value: 99% duty cycle maintains regulation during brownouts; PGOOD enables system-level fault logging; 125°C rating survives cabinet heat buildup. | Use Scenario: Supplying ultra-low-noise 1.8V/3.3V rails to MEMS accelerometers, pressure transducers, and wireless edge nodes in harsh factory environments. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC stage replacing linear regulators to extend battery life and reduce thermal load. Use Value: 27μA skip-mode IQ enables multi-year operation on coin cells; spread-spectrum minimizes RF interference with 2.4GHz BLE/Wi-Fi coexistence. |
| Railway Onboard Controllers | Process Instrumentation Transmitters |
Use Scenario: Regulating 36V train battery supply to 5V/12V for microcontroller, CAN transceiver, and display subsystems in rolling stock. IC Role / Device Role / Timing Role: Input-stage buck converter handling wide-range 24–36V nominal input with EN-controlled hot-swap sequencing. Use Value: 42V absolute max input withstands load-dump transients; EN hysteresis (200mV) prevents chatter during undervoltage recovery. | Use Scenario: Providing stable 3.3V for HART-modem ICs and 12V for 4–20mA loop drivers in explosion-proof process transmitters. IC Role / Device Role / Timing Role: Isolated secondary-side regulator fed from flyback or transformer-derived 15–24V intermediate rail. Use Value: ±2.25% PGOOD window ensures compliance with SIL-2 functional safety diagnostics; 1.5MHz operation avoids AM radio band interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42403AFLB+ | Same package and pinout; higher 3.5A current rating and identical 1.5MHz/0.8–12V specs | Used where peak transient loads exceed 2.5A or margin is required for derating | Select MAX42403AFLB+ when >2.5A continuous or >3.5A pulsed output is needed; otherwise MAX42402AFLB+ offers optimal cost/performance balance |
| TPS54260DGQR | 3.5–60V input, 2.5A, 100–2500kHz adjustable fSW, no integrated BIAS LDO or spread-spectrum | Requires external bias supply and EMI filtering; suited for variable-frequency designs needing >60V input | Choose TPS54260DGQR only if input exceeds 36V or programmable frequency is mandatory; MAX42402AFLB+ delivers superior integration and EMI performance at 1.5MHz |
Compared with MAX42403AFLB+, the MAX42402AFLB+ trades 1A output capacity for lower thermal stress and potentially longer lifetime in 2.5A-constrained designs; versus TPS54260DGQR, it eliminates external bias circuitry and built-in spread-spectrum reduces board-level filtering requirements.
Availability
MAX42402AFLB+ 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 support, and RoHS-compliant packaging.
Supply support for MAX42402AFLB+ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The MAX42402/MAX42403 product line was engineered specifically for space-constrained industrial point-of-load applications demanding wide-input-voltage capability, ultra-low quiescent current, and robust protection - all within a 3mm × 3mm FC2QFN footprint.
FAQ
What is the maximum input voltage rating for the MAX42402AFLB+?
The MAX42402AFLB+ has an absolute maximum input voltage rating of +42V on the SUP pin, with recommended continuous operation from 4.5V to 36V. This 36V upper limit supports 24V industrial buses and accommodates transient overvoltages common in factory and transportation systems without requiring external clamping.
Does the MAX42402AFLB+ require external compensation components?
No, the MAX42402AFLB+ uses internal compensation and does not require external compensation components. Its average current-mode architecture with fixed slope compensation is optimized for stability with the recommended inductor and output capacitor values listed in the datasheet - simplifying design and reducing bill-of-materials count.
How does the PGOOD function work on the MAX42402AFLB+?
The MAX42402AFLB+ PGOOD pin is an open-drain output that goes high when VOUT is within ±2.25% of its target (e.g., 3.3V ±74mV). It pulls low if VOUT falls below 93% or rises above 105% of nominal, with 180μs rising and 70μs falling debounce times - providing reliable power sequencing and fault indication without external comparators.
Can the MAX42402AFLB+ operate in forced-PWM mode?
Yes, the MAX42402AFLB+ supports forced-PWM mode by pulling the SYNC pin high. In this mode, it maintains constant 1.5MHz switching regardless of load, eliminating low-frequency beat notes and improving EMI predictability - essential for noise-sensitive applications like precision data acquisition and RF subsystems.
What thermal performance can be expected from the MAX42402AFLB+ in a standard 4-layer PCB layout?
In a standard 4-layer JEDEC board, the MAX42402AFLB+ exhibits θJA = 51°C/W and θJC = 21°C/W. With proper copper pour and thermal vias under the exposed PGND pad, it sustains 2.5A continuous output at +70°C ambient without derating - verified per Analog Devices' thermal characterization methodology and EV kit measurements.
MAX42402AFLB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-PowerWFQFN
- Packaging:
- Tray
- 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):
- 12V
- Current - Output:
- 2.5A
- 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:
- 15-FC2QFN (3x3)
MAX42402AFLB+ FAQ
1.How can I place an order for MAX42402AFLB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42402AFLB+ 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 MAX42402AFLB+ reliable?
The price and inventory of MAX42402AFLB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42402AFLB+ is usually 5 days.
3.What payment methods are accepted for MAX42402AFLB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42402AFLB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42402AFLB+?
MAX42402AFLB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42402AFLB+ 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 MAX42402AFLB+?
For technical support, including MAX42402AFLB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42402AFLB+ requirements.
6.How does Aetrix verify that MAX42402AFLB+ is sourced from the original manufacturer or authorized distributors?
All MAX42402AFLB+ 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 MAX42402AFLB+ meets industry standards.
7.What is the process for return or replacement of MAX42402AFLB+?
All MAX42402AFLB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX42402AFLB+, 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 MAX42402AFLB+ part is unused and in its original packaging.
Return procedure for MAX42402AFLB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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