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Analog Devices Inc./Maxim Integrated MAX42402AFLA+T
- Part No.:
- MAX42402AFLA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-PowerWFQFN
- Datasheet:
-
MAX42402AFLA+T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
MAX42402AFLA+T from Analog Devices is a fully integrated 36V synchronous buck converter with internal high-side and low-side MOSFETs, delivering up to 2.5A continuous output current across a 4.5V–36V input range. It features 400kHz fixed switching frequency, 0.8V–14V programmable output voltage, 27μA quiescent current in skip mode, and 99% dropout operation-optimized for industrial point-of-load power in space-constrained automation systems.
For engineers reviewing the MAX42402AFLA+T datasheet, MAX42402AFLA+T pinout, MAX42402AFLA+T application, or MAX42402AFLA+T equivalent, key selection criteria include its FC2QFN-15 package footprint, PGOOD monitoring capability, spread-spectrum EMI reduction, forced-PWM/skip-mode control via SYNC, and precision enable/UVLO thresholds for robust system-level power sequencing.
Technical Context
The MAX42402AFLA+T implements average current-mode control with fixed 400kHz oscillator, enabling stable regulation under wide VIN/VOUT ratios and fast transient response. Its integrated 96mΩ/46mΩ (HS/LS) MOSFETs support high-efficiency conversion at full 2.5A load while maintaining thermal integrity up to +125°C ambient.
Internal soft-start (2.5ms), precision 0.8V feedback reference (±1.5% over temperature), windowed PGOOD (±1% UV/OV thresholds), and hiccup-mode short-circuit protection provide safety-critical behavior required in industrial PLCs and sensor nodes without external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial DC bus voltages including 12V, 24V, and 36V rails without pre-regulation. |
| Output Current | 2.5A continuous - sufficient for powering microcontrollers, FPGAs, and analog front-ends in compact embedded systems. |
| Switching Frequency | 400kHz - enables use of small 6.8μH inductors and reduces output ripple vs. lower-frequency alternatives. |
| Output Voltage Range | 0.8V to 14V - adjustable via external resistor divider; covers standard logic I/O (1.8V, 3.3V, 5V) and analog supply needs. |
| Quiescent Current | 27μA in skip mode - extends battery life or reduces standby losses in always-on industrial sensors. |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 12V input → 11.9V output), critical for brownout resilience. |
| Thermal Shutdown | 175°C with 15°C hysteresis - protects against sustained overload or poor PCB heatsinking in enclosed enclosures. |
Pinout & Package
MAX42402AFLA+T is housed in a 3mm × 3mm, 15-pin FC2QFN package with exposed thermal pad (Package Code: F153B3F+1F). The symmetrical SUP/PGND pin layout minimizes EMI loop area and improves noise immunity in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | High-voltage-tolerant (up to 42V) active-high logic input; controls startup/shutdown and initiates BIAS LDO activation. |
| SUP (Pins 3,7) | High-Side Supply Input | Power source for internal gate drivers and high-side FET; requires local 0.1μF + 2.2μF ceramic decoupling per pin. |
| PGND (Pins 4,6) | Power Ground | Low-impedance return path for high-current LX switching node; must be tied directly to GND plane under IC. |
| LX | Switch Node | Connection to inductor's switched side; carries high di/dt current; requires minimal trace area to reduce EMI radiation. |
| BST | Bootstrap Capacitor Terminal | Connects 0.1μF ceramic capacitor to LX to generate gate drive voltage for high-side MOSFET. |
| BIAS | Internal LDO Output | 1.8V regulated supply for analog circuitry; requires ≥2.2μF ceramic capacitor to PGND for stability. |
| SYNC | Mode Control Input | Pull low for skip mode (light-load efficiency); pull high for forced-PWM (EMI control); accepts external clock up to 600kHz. |
| SPS | Spread-Spectrum Enable | Logic-high enables ±6% triangular frequency modulation to reduce peak EMI emissions by spreading energy across spectrum. |
| FB | Feedback Input | Monitors output via resistor divider; 0.8V reference enables precise VOUT programming with <±1.5% accuracy over temperature. |
| PGOOD | Open-Drain Status Output | Active-high signal indicating VOUT within ±2% window; requires external pull-up to BIAS or system rail for power-good sequencing. |
| GND | Analog Ground | Quiet reference for internal comparators and error amplifier; must be connected to PGND under IC with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 96mΩ high-side + 46mΩ low-side MOSFETs eliminate external FETs and gate drivers, reducing BOM count and layout complexity. |
| Programmable UVLO | Adjustable input undervoltage lockout via EN threshold (2.725V–3.025V rising) enables custom brownout recovery points. |
| Robust Protection Suite | Includes overtemperature shutdown (175°C), cycle-by-cycle current limit (4.0A typ), hiccup-mode short-circuit response, and output overvoltage clamping. |
| Low-Noise Soft-Start | Fixed 2.5ms ramp time prevents inrush current surges and ensures controlled power-up in multi-rail systems. |
| EMI-Optimized Architecture | Symmetrical SUP/PGND pinout, spread-spectrum modulation, and forced-PWM mode collectively meet CISPR-22 Class B radiated emission limits. |
Applications
| Industrial PLC I/O Module | Smart Sensor Node |
|---|---|
Use Scenario: Powering isolated digital I/O channels and analog input circuitry in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting 24V DC bus to clean, sequenced logic supplies with PGOOD confirmation. Use Value: 99% duty cycle sustains output during 24V bus dips to 23.8V; 27μA skip-mode current minimizes heat in sealed enclosures. | Use Scenario: Providing regulated 1.8V and 3.3V rails for ultra-low-power microcontrollers and MEMS accelerometers in wireless condition-monitoring sensors. IC Role / Device Role / Timing Role: High-efficiency buck converter with programmable soft-start and precise enable threshold for battery-backed wake-up sequencing. Use Value: 400kHz switching allows compact 6.8μH inductor; spread-spectrum mode suppresses narrowband EMI peaks that interfere with RF coexistence. |
| Factory Automation HMI | Motor Drive Auxiliary Supply |
Use Scenario: Generating stable 5V and 12V outputs for touch-screen controllers, LED backlights, and CAN transceivers in human-machine interface panels. IC Role / Device Role / Timing Role: Dual-output capable buck (with external divider tuning) delivering tightly regulated rails with independent PGOOD status reporting. Use Value: Windowed PGOOD (±1%) ensures reliable reset signaling to MCU; -40°C to +125°C rating supports operation near hot motor enclosures. | Use Scenario: Powering gate drivers, op-amps, and isolated communication ICs in servo and VFD inverters where main DC bus ranges from 12V to 36V. IC Role / Device Role / Timing Role: Robust auxiliary supply tolerant of high dv/dt noise and bus transients common in motor drive environments. Use Value: Internal soft-start prevents false triggering of overcurrent protection during startup; symmetrical layout reduces coupling into sensitive analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 4.5V–36V input, 8A output, 2.1MHz switching, no spread-spectrum, larger 16-pin WQFN package. | Higher current capacity suits higher-power motor drives; lacks PGOOD windowing and hiccup-mode short-circuit protection. | Select LM61480RQR only when >3.5A output or faster transient response is required; verify PCB layout accommodates larger thermal pad. |
| TPS54240DGQ | 3.5V–42V input, 2.5A output, 100kHz–2.5MHz adjustable frequency, no integrated low-side FET, external compensation required. | Requires external MOSFET and loop compensation components; offers wider frequency tuning but increases design effort and BOM cost. | Choose TPS54240DGQ if frequency agility or external current sensing is mandatory; otherwise MAX42402AFLA+T provides simpler, more integrated solution. |
Compared with LM61480RQR and TPS54240DGQ, the MAX42402AFLA+T delivers superior integration (dual-FET + LDO + PGOOD + spread-spectrum), smaller 3×3mm footprint, and factory-trimmed 0.8V reference-making it optimal for space-constrained industrial modules where reliability and EMI compliance are prioritized over raw current headroom or frequency flexibility.
Availability
MAX42402AFLA+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 MAX42402AFLA+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 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 connectivity solutions.
The MAX42402/MAX42403 family was designed specifically for compact, high-reliability industrial DC-DC conversion-emphasizing wide-input operation, integrated protection, and EMI-hardened architecture for harsh electromagnetic environments.
FAQ
What is the maximum output current supported by the MAX42402AFLA+T?
The MAX42402AFLA+T supports up to 2.5A continuous output current at ambient temperatures up to +125°C, verified across its full 4.5V–36V input range and 0.8V–14V output range. This rating assumes proper PCB thermal design using the exposed thermal pad and four-layer board layout per Analog Devices' EV kit guidelines.
Does the MAX42402AFLA+T require external compensation components?
No, the MAX42402AFLA+T uses an internally compensated average current-mode control architecture. No external compensation network is needed-only the recommended input/output capacitors, inductor, feedback resistors, and BST capacitor are required for stable operation per the datasheet's Typical Application Circuits.
How does the PGOOD function work on the MAX42402AFLA+T?
The MAX42402AFLA+T features a windowed open-drain PGOOD output that asserts high only when VOUT remains within 93%–105% of its nominal value. It debounces UV/OV events with 180μs rising and 70μs falling delays (at 1.5MHz), and requires an external pull-up resistor-typically to the BIAS rail-to interface with system supervisors or microcontroller reset inputs.
Can the MAX42402AFLA+T operate with a 12V input and 11.9V output?
Yes-the MAX42402AFLA+T supports 99% maximum duty cycle, enabling operation in dropout mode. With a 12V input and 11.9V output, the device maintains regulation by extending the high-side switch on-time, making it suitable for applications experiencing input voltage sag due to cable drop or shared bus loading.
What is the purpose of the SPS pin on the MAX42402AFLA+T?
The SPS (Spread-Spectrum) pin on the MAX42402AFLA+T enables or disables ±6% triangular frequency modulation of the internal 400kHz oscillator. When pulled high, it spreads radiated EMI energy across a 24kHz bandwidth, reducing peak emissions by up to 10dB-critical for meeting CISPR-22 Class B requirements without added shielding or filtering.
MAX42402AFLA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-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):
- 12V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 15-FC2QFN (3x3)
MAX42402AFLA+T FAQ
1.How can I place an order for MAX42402AFLA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42402AFLA+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 MAX42402AFLA+T reliable?
The price and inventory of MAX42402AFLA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42402AFLA+T is usually 5 days.
3.What payment methods are accepted for MAX42402AFLA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42402AFLA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42402AFLA+T?
MAX42402AFLA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42402AFLA+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 MAX42402AFLA+T?
For technical support, including MAX42402AFLA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42402AFLA+T requirements.
6.How does Aetrix verify that MAX42402AFLA+T is sourced from the original manufacturer or authorized distributors?
All MAX42402AFLA+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 MAX42402AFLA+T meets industry standards.
7.What is the process for return or replacement of MAX42402AFLA+T?
All MAX42402AFLA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX42402AFLA+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 MAX42402AFLA+T part is unused and in its original packaging.
Return procedure for MAX42402AFLA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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