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Analog Devices Inc./Maxim Integrated MAX42402AFLA+
- Part No.:
- MAX42402AFLA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-PowerWFQFN
- Datasheet:
-
MAX42402AFLA+.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX42402AFLA+ from Analog Devices is a fully integrated 36V synchronous buck converter delivering up to 2.5A with 4.5V–36V input range, 400kHz fixed switching frequency, ±6% spread-spectrum modulation, and adjustable 0.8V–14V output voltage. It features internal high-side/low-side MOSFETs, 99% dropout operation, and PGOOD monitoring-designed for industrial point-of-load power in space-constrained systems.
For engineers reviewing the MAX42402AFLA+ datasheet, MAX42402AFLA+ pinout, MAX42402AFLA+ application, or MAX42402AFLA+ equivalent, key selection considerations include its 400kHz/2.5A/0.8–14V configuration, FC2QFN-15 package, 27μA no-load quiescent current in skip mode, and integrated thermal/overvoltage/short-circuit protection.
Technical Context
The MAX42402AFLA+ employs average current-mode control with fixed 400kHz oscillator, enabling robust noise rejection and short minimum on-time (37ns). Its symmetrical SUP pinout reduces EMI, while internal soft-start (2.5ms) limits inrush current during startup.
It integrates a 1.8V BIAS LDO, precision enable threshold (2.725V–3.025V UVLO), and windowed PGOOD with 93%–105% output voltage monitoring. Protection includes hiccup-mode short-circuit response, thermal shutdown at 175°C, and overvoltage discharge via low-side FET activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial supply rails including 24V DC systems and automotive transients. |
| Output Current | 2.5A continuous - sufficient for powering microcontrollers, sensors, and I/O peripherals in embedded controllers. |
| Switching Frequency | 400kHz - enables compact external components (e.g., 6.8μH inductor, 50μF output cap) and reduced output ripple. |
| Output Voltage Range | 0.8V to 14V - programmable via resistor divider; supports 3.3V, 5V, 12V rails and ASIC/FPGA core supplies. |
| Quiescent Current | 27μA in skip mode - extends battery life in always-on industrial monitoring nodes with intermittent activity. |
| Duty Cycle Max | 99% - maintains regulation under near-droop conditions (e.g., 12V out from 12.5V input), critical for legacy 12V bus systems. |
| Spread Spectrum | ±6% modulation - lowers peak EMI emissions without requiring external filtering, easing EMC certification. |
Pinout & Package
MAX42402AFLA+ is housed in a 3mm × 3mm, 15-pin FC2QFN package with exposed thermal pad (Package Code: F153B3F+1F). The symmetrical SUP/PGND layout minimizes loop inductance and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-tolerant (up to 42V) logic input; activates converter when pulled above 0.9V; enables precise system-level power sequencing. |
| SUP (pins 3,7) | High-side supply input | Power source for internal gate drivers and high-side FET; requires dual bypass (0.1μF + 2.2μF) per pin for stable switching. |
| PGND (pins 4,6) | Power ground | Low-impedance return path for high-current LX switching node; must be connected directly to GND under IC for minimal noise coupling. |
| LX | Switch node | Connection to inductor's switched side; carries high di/dt current; layout must minimize trace area to reduce EMI and voltage spikes. |
| BST | Bootstrap capacitor terminal | Provides gate drive voltage for high-side FET; requires 0.1μF ceramic capacitor between BST and LX for reliable turn-on. |
| BIAS | Internal LDO output | 1.8V regulated supply for analog circuitry; requires ≥2.2μF ceramic capacitor to PGND for stability and noise immunity. |
| FB | Voltage feedback input | Monitors output via resistor divider; reference voltage = 0.800V ±12mV; sets output with 0.8V–14V range and <1% accuracy over temperature. |
| PGOOD | Open-drain status output | Asserts high when VOUT is within 93–105% of target; requires external pull-up; enables system fault detection and power sequencing. |
| SYNC | Mode/frequency control | Pulled low → skip mode; pulled high → forced PWM; driven by external clock → synchronization; critical for EMI control and multi-rail coordination. |
| SPS | Spread-spectrum enable | Logic-high enables ±6% triangular frequency modulation; disabled during external sync; reduces radiated emissions without affecting regulation. |
| GND | Analog ground | Quiet reference for FB, PGOOD, and internal comparators; must be tied to PGND under IC to avoid ground bounce. |
| NC (pins 2,8) | No connect | Unbonded pins; must remain unconnected and unpopulated on PCB to prevent parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | High-side (96mΩ typ) and low-side (46mΩ typ) DMOS FETs eliminate external MOSFETs and drivers, reducing BOM count and board area. |
| Ultra-Low Light-Load IQ | 27μA quiescent current in skip mode enables >10-year battery life in remote sensor nodes with infrequent wake-ups. |
| Programmable UVLO Threshold | Adjustable enable threshold via external resistor divider on EN pin allows custom brown-out behavior for system-level power management. |
| Robust Protection Suite | Includes hiccup-mode short-circuit response, thermal shutdown (175°C), overvoltage discharge, and current-limit (4.0A typ) - eliminates need for external protection ICs. |
| EMI-Optimized Layout | Symmetrical SUP/PGND pinout, integrated spread spectrum, and internal slope compensation reduce conducted/radiated noise, simplifying compliance testing. |
Applications
| Industrial PLC I/O Module | Factory Automation Sensor Hub |
|---|---|
Use Scenario: Powering isolated digital I/O channels, analog input front-ends, and communication interfaces (RS-485, CAN) in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting 24V DC rail; provides clean, regulated supply with PGOOD signaling for firmware-controlled power-up sequencing. Use Value: 99% duty cycle ensures stable 5V output even as 24V bus sags to 5.2V during motor startup; 400kHz switching allows small 6.8μH inductor and 50μF ceramic output cap. | Use Scenario: Centralized power for distributed wireless sensor nodes (temperature, vibration, pressure) in predictive maintenance gateways. IC Role / Device Role / Timing Role: Main 3.3V supply for MCU, RF transceiver, and analog signal chain; operates in skip mode during sleep cycles to minimize standby power. Use Value: 27μA no-load IQ extends coin-cell or energy-harvesting battery life; spread-spectrum modulation meets CISPR-22 Class B radiated emissions limits without shielding. |
| Ruggedized HMI Display Controller | Condition Monitoring Edge Node |
Use Scenario: Powering ARM-based display controller, touch interface, and backlight LED driver in industrial HMIs exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Adjustable 12V output stage feeding buck-boost LED driver; uses PGOOD to validate rail before enabling display backlight. Use Value: -40°C to +125°C operating range and 175°C thermal shutdown ensure reliability in uncooled enclosures; 0.8V–14V adjustability supports multiple LED string configurations. | Use Scenario: Powering vibration sensor, ADC, and LoRaWAN transceiver in oil/gas pipeline condition monitors deployed in remote, unattended locations. IC Role / Device Role / Timing Role: Single-chip 3.3V supply with integrated BIAS LDO powering all subsystems; uses EN pin for deep-sleep wake-up control. Use Value: Internal 1.8V BIAS LDO powers analog blocks independently, improving PSRR; 4.5V–36V input range tolerates solar charge fluctuations and battery voltage decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42403AFLA+ | Higher 3.5A output current, identical 400kHz/0.8–14V/±6% spec; higher ILIM (4.375–6.2A vs. 3.3–4.7A). | Supports heavier loads (e.g., multi-core MCUs, FPGA I/O banks); same footprint and pinout. | Select when load exceeds 2.5A but layout constraints prohibit redesign; drop-in upgrade with no PCB change. |
| LM61480RGER | Texas Instruments part: 36V, 8A, 400kHz, adjustable 0.8–20V; no spread spectrum; larger 3mm × 4mm WQFN-16 package. | Higher current capacity and wider VOUT range; lacks integrated spread spectrum and symmetrical SUP layout. | Choose when >2.5A is required and EMI filtering can be added externally; verify thermal performance with θJA = 42.5°C/W. |
Compared with MAX42402AFLA+, MAX42403AFLA+ offers higher current headroom in identical form factor, while LM61480RGER trades integrated EMI reduction for higher output capability and different package geometry-making MAX42402AFLA+ optimal for compact, low-noise 2.5A industrial PoL designs.
Availability
MAX42402AFLA+ is available at Aetrix Electronics and suitable for industrial automation, point-of-load conversion, and distributed DC power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX42402AFLA+ 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.
The MAX42402/MAX42403 product line delivers ultra-compact, high-efficiency synchronous buck converters for space-constrained industrial and embedded applications where reliability, low EMI, and wide input range are critical.
FAQ
What is the maximum input voltage rating for MAX42402AFLA+?
The MAX42402AFLA+ has an absolute maximum input voltage (SUP pin) of +42V for durations under 1 second, with recommended continuous operation from 4.5V to 36V. This 36V rating supports standard 24V industrial buses and accommodates transient surges common in factory environments. Exceeding 42V risks permanent damage per the Absolute Maximum Ratings table.
Does MAX42402AFLA+ support external frequency synchronization?
Yes, MAX42402AFLA+ supports external clock synchronization via the SYNC pin. When driven with a square wave in the range of 360–600kHz (for 400kHz internal mode), it locks to the external clock within two cycles. This feature enables deterministic timing across multiple rails and reduces beat-frequency EMI in multi-converter systems.
How does the PGOOD function work on MAX42402AFLA+?
The PGOOD pin on MAX42402AFLA+ is an open-drain output that asserts high when the output voltage is within 93%–105% of its nominal value. It features 180μs rising-edge debounce (at 1.5MHz) and includes windowed detection with separate UV/OV thresholds. A 20kΩ pull-up to BIAS or external supply is required for proper logic-level signaling.
What is the purpose of the BIAS pin on MAX42402AFLA+?
The BIAS pin on MAX42402AFLA+ delivers a regulated 1.8V output from an internal LDO, powering internal analog circuitry including error amplifiers and comparators. It requires a minimum 2.2μF ceramic capacitor to PGND placed adjacent to the pin to ensure stability, low noise, and accurate feedback regulation-critical for maintaining 0.8V reference accuracy.
Can MAX42402AFLA+ operate in dropout mode, and what is the minimum dropout voltage?
Yes, MAX42402AFLA+ supports dropout operation with up to 99% duty cycle, enabling regulation when input voltage approaches output voltage. For example, it can maintain 5V output with only 5.05V input (100mV dropout). This capability is essential for industrial systems where input rails sag under load, ensuring uninterrupted operation without external LDO post-regulation.
MAX42402AFLA+ 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:
- 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+ FAQ
1.How can I place an order for MAX42402AFLA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42402AFLA+ 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+ reliable?
The price and inventory of MAX42402AFLA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42402AFLA+ is usually 5 days.
3.What payment methods are accepted for MAX42402AFLA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42402AFLA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42402AFLA+?
MAX42402AFLA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42402AFLA+ 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+?
For technical support, including MAX42402AFLA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42402AFLA+ requirements.
6.How does Aetrix verify that MAX42402AFLA+ is sourced from the original manufacturer or authorized distributors?
All MAX42402AFLA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX42402AFLA+?
All MAX42402AFLA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX42402AFLA+, 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+ part is unused and in its original packaging.
Return procedure for MAX42402AFLA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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