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Analog Devices Inc./Maxim Integrated MAX42402AFLB+T
- Part No.:
- MAX42402AFLB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-PowerWFQFN
- Datasheet:
-
MAX42402AFLB+T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,254
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Product details
Overview
MAX42402AFLB+T 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, adjustable 0.8V–12V 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+T datasheet, MAX42402AFLB+T pinout, MAX42402AFLB+T application, or MAX42402AFLB+T equivalent, key selection considerations include its 1.5MHz/400kHz dual-frequency option (this variant = 1.5MHz), ±6% spread-spectrum EMI reduction, internal soft-start (3.5ms), precision PGOOD window (±5%), and thermal shutdown at 175°C with 15°C hysteresis.
Technical Context
The MAX42402AFLB+T implements average current-mode control with fixed 1.5MHz oscillator, enabling stable regulation across 4.5V–36V input while supporting 99% duty cycle for ultra-low dropout operation. Its integrated high-side (96mΩ typ) and low-side (46mΩ typ) DMOS FETs eliminate external power switches, and the internal 1.8V BIAS LDO powers all control circuitry.
Operation modes are selected via SYNC pin: logic high enables forced-PWM (fixed-frequency), logic low enables automatic skip mode for light-load efficiency, and external clock input synchronizes to frequencies between 1.215–1.845MHz. Spread-spectrum modulation (enabled by SPS pin high) dithers fSW by ±6% with 300μs period to suppress radiated EMI peaks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports 24V industrial rails and automotive transients up to 42V (absolute max) |
| Output Current | 2.5A continuous - sufficient for FPGA core rails, PLC I/O modules, and sensor signal chains |
| Switching Frequency | 1.5MHz (fixed) - enables use of sub-3μH inductors and <50μF ceramic output capacitance |
| Output Voltage Range | 0.8V to 12V (adjustable via FB resistor divider) - covers standard logic rails (1.2V, 1.8V, 3.3V, 5V, 12V) |
| Quiescent Current | 27μA in skip mode - extends battery life in always-on industrial monitoring nodes |
| Duty Cycle Max | 99% - maintains regulation with only 0.36V headroom at 12V out (e.g., 12.36V min input) |
| PGOOD Accuracy | ±3% UV/OV window (93–107% VOUT) - provides reliable system-level power sequencing and fault detection |
| Operating Temp | −40°C to +125°C ambient - qualified for extended industrial temperature environments |
Pinout & Package
Package: 15-pin FC2QFN (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed PGND pad. RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage-tolerant (up to 42V), active-high digital control - enables internal BIAS LDO when >0.9V |
| 3,7 SUP | High-side supply input | Power source for internal gate drivers; requires local 0.1μF + 2.2μF ceramic bypass per pin |
| 4,6 PGND | Power ground | High-current return path for LX switch node; must be connected directly to exposed thermal pad |
| 5 LX | Switch node | Connection to inductor; carries full AC ripple current - requires minimal loop area for EMI control |
| 9 BST | Bootstrap capacitor terminal | Connects 0.1μF ceramic cap to LX to generate high-side gate drive voltage above SUP |
| 10 GND | Analog ground | Quiet reference for feedback and logic circuits; separate from PGND but tied at single point |
| 11 BIAS | Internal LDO output | 1.8V regulated supply for internal circuitry; requires ≥2.2μF ceramic cap to PGND |
| 12 SPS | Spread-spectrum enable | Logic high activates ±6% frequency dithering; disabled during external SYNC operation |
| 13 FB | Feedback input | 0.8V reference input - sets output via resistor divider; leakage <100nA minimizes error |
| 14 PGOOD | Open-drain status output | Active-high power-good flag with 180μs debounce; requires external pull-up to BIAS or system rail |
| 15 SYNC | Mode/frequency control | Logic low = skip mode; logic high = forced PWM; external clock input (1.215–1.845MHz) for synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous integration | Integrated 96mΩ HS / 46mΩ LS MOSFETs eliminate external power stage, reducing BOM count and layout area |
| Ultra-low IQ skip mode | 27μA no-load current enables >1-year battery life in remote sensors without compromising startup time |
| Fixed 1.5MHz operation | Enables compact magnetics (e.g., 2.2μH) and small ceramic output caps (e.g., 42μF), minimizing solution size to <100mm² |
| Programmable PGOOD window | Accurate ±3% UV/OV thresholds ensure reliable power sequencing in safety-critical PLC and motor drives |
| Robust protection suite | Includes hiccup-mode short-circuit response, thermal shutdown (175°C), overvoltage discharge, and precise UVLO on SUP/BIAS |
| EMI-optimized architecture | Symmetrical SUP/PGND pinout, spread-spectrum modulation, and forced-PWM mode reduce peak radiated emissions by >10dB |
Applications
| Industrial PLC I/O Modules | Factory Automation Sensors |
|---|---|
Use Scenario: Powering isolated analog input/output channels in DIN-rail mounted programmable logic controllers requiring clean, stable 3.3V or 5V rails from 24V DC bus. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 2.5A with <1% output ripple and fast transient response to handle DAC/ADC reference switching noise. Use Value: 99% dropout capability ensures uninterrupted operation during brownouts; PGOOD enables safe channel disable before undervoltage lockout. | Use Scenario: Supplying 1.8V/3.3V to MEMS accelerometers, temperature transmitters, and IO-Link devices deployed in harsh factory environments. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter operating continuously at −40°C to +85°C ambient with minimal heatsinking. Use Value: 27μA skip-mode IQ extends battery life in wireless condition-monitoring nodes; 1.5MHz switching avoids AM radio band interference. |
| Motor Drive Control Boards | Ruggedized Edge Computing Nodes |
Use Scenario: Generating gate driver bias and microcontroller core voltage in servo drives where input voltage varies from 12V (battery) to 36V (bus). IC Role / Device Role / Timing Role: Dual-rail buck converter powering MCU (1.2V), gate driver (5V), and op-amps (±15V derived from secondary converters). Use Value: Wide 4.5V–36V input handles regenerative braking spikes; internal soft-start (3.5ms) prevents inrush into large gate-drive capacitors. | Use Scenario: Powering ARM-based edge AI processors and Ethernet PHYs in outdoor kiosks or railway signaling systems exposed to wide temperature swings. IC Role / Device Role / Timing Role: High-reliability POL regulator meeting AEC-Q200 stress requirements via −40°C to +125°C qualification and 150k-hour MTTF modeling. Use Value: Spread-spectrum EMI reduction meets CISPR-22 Class B limits without added shielding; SYNC pin allows system-wide clock alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX42402AFLA+ | Same IC family, 400kHz switching (vs. 1.5MHz), 0.8V–14V output range (vs. 0.8V–12V) | Better suited for higher-output-capacitance, lower-ripple designs where EMI filtering is prioritized over size | Select for applications needing wider VOUT range or lower switching losses at medium loads |
| TPS54202DRCT | TI part: 4.5V–28V input, 2A, 500kHz–2.5MHz adjustable fSW, no integrated spread spectrum | Lacks ±6% EMI dithering and 36V absolute max rating; requires external compensation | Choose when design flexibility (adjustable fSW, external loop compensation) outweighs integrated EMI features and 36V tolerance |
Compared with MAX42402AFLA+, the MAX42402AFLB+ trades 2V of output voltage headroom for 3.75× higher switching frequency - enabling smaller passives and faster transient response. Against TPS54202DRCT, it offers superior input voltage range, integrated spread spectrum, and simpler layout at the cost of fixed frequency and non-adjustable compensation.
Availability
MAX42402AFLB+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 support, and guaranteed RoHS compliance.
Supply support for MAX42402AFLB+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 MAX42402/MAX42403 product line delivers ultra-compact, high-efficiency synchronous buck regulators targeting space-constrained industrial and factory automation applications where wide VIN, low IQ, and EMI robustness are mandatory.
FAQ
What is the maximum output voltage supported by the MAX42402AFLB+T?
The MAX42402AFLB+T supports an adjustable output voltage range of 0.8V to 12V, set via an external resistor divider on the FB pin. This upper limit is specific to the 1.5MHz version (AFLB); the 400kHz variant (AFLA) supports up to 14V. The 0.8V reference accuracy is ±1.5% over temperature, ensuring tight regulation across the full range.
Does the MAX42402AFLB+T require external compensation components?
No, the MAX42402AFLB+T uses internal compensation optimized for its average current-mode architecture and fixed 1.5MHz switching frequency. No external compensation network is needed - only the required input/output capacitors, inductor, feedback resistors, bootstrap capacitor, and BIAS capacitor must be placed per the recommended layout guidelines.
How does the MAX42402AFLB+T handle short-circuit conditions?
Under short-circuit, the MAX42402AFLB+T enters hiccup mode after detecting sustained overcurrent: it disables switching for 25ms (10 × 2.5ms soft-start time at 400kHz; 35ms at 1.5MHz), then attempts restart. This cycle repeats until the fault clears. Hiccup mode is disabled during soft-start to prevent false triggering during power-up.
Can the MAX42402AFLB+T operate with an input voltage below 4.5V?
No - the absolute minimum operating input voltage for the MAX42402AFLB+T is 4.5V, as specified in the Electrical Characteristics table. Below this, the internal regulators cannot sustain bias, and the device will not start or may behave unpredictably. The 2.9V–3.15V SUP UVLO threshold ensures reliable turn-on only within the validated 4.5V–36V range.
What is the thermal performance of the MAX42402AFLB+T in a standard 4-layer PCB layout?
On a standard four-layer JEDEC board, the MAX42402AFLB+T exhibits θJA = 51°C/W and θJC = 21°C/W. With proper copper pour under the exposed PGND pad and symmetric input capacitor placement, it delivers full 2.5A output at +85°C ambient without derating. Thermal shutdown activates at 175°C junction temperature with 15°C hysteresis for safe recovery.
MAX42402AFLB+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:
- 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+T FAQ
1.How can I place an order for MAX42402AFLB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX42402AFLB+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 MAX42402AFLB+T reliable?
The price and inventory of MAX42402AFLB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX42402AFLB+T is usually 5 days.
3.What payment methods are accepted for MAX42402AFLB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX42402AFLB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX42402AFLB+T?
MAX42402AFLB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX42402AFLB+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 MAX42402AFLB+T?
For technical support, including MAX42402AFLB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX42402AFLB+T requirements.
6.How does Aetrix verify that MAX42402AFLB+T is sourced from the original manufacturer or authorized distributors?
All MAX42402AFLB+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 MAX42402AFLB+T meets industry standards.
7.What is the process for return or replacement of MAX42402AFLB+T?
All MAX42402AFLB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX42402AFLB+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 MAX42402AFLB+T part is unused and in its original packaging.
Return procedure for MAX42402AFLB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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