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Analog Devices Inc./Maxim Integrated MAX25240AFFD/VY+T
- Part No.:
- MAX25240AFFD/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25240AFFD/VY+T.pdf
- Description:
- IC REG BUCK BST ADJ/3V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,972
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Product details
Overview
MAX25240AFFD/VY+T from Analog Devices is an automotive-grade synchronous buck-boost DC-DC converter with integrated H-bridge FETs, delivering up to 6A continuous output current across a 2V–36V input range and supporting fixed (5V/11.5V) or adjustable 3V–20V output. It features 2.1MHz/400kHz/200kHz selectable switching frequency, 95μA standby quiescent current, and AEC-Q100 Grade 1 qualification for ADAS ECU and start-stop systems.
For engineers reviewing the MAX25240AFFD/VY+T datasheet, MAX25240AFFD/VY+T pinout, MAX25240AFFD/VY+T application, or MAX25240AFFD/VY+T equivalent, key selection criteria include input transient tolerance (42V), EN pin voltage rating (up to 42V), PGOOD monitoring capability, spread-spectrum EMI reduction, and thermal shutdown at 175°C with 20°C hysteresis.
Technical Context
The MAX25240AFFD/VY+T implements peak-current-mode control across three operating modes-buck, boost, and buck-boost-dynamically transitioning based on VIN/VOUT ratio using internally preset duty-cycle limits (DMAX = 0.73 for 2.1MHz variant). Its H-bridge architecture integrates four power MOSFETs (HS1/LS1/HS2/LS2) with 20mΩ typical RDSON, enabling seamless mode transitions without external control logic.
It supports three SYNC-configurable operation modes: skip mode (ultra-low IQ), forced PWM, or external clock synchronization with ±20% frequency lock range and two-cycle acquisition. The internal 1.8V VCC LDO powers all analog blocks and is biased from VIN during startup, switching to VOUT once regulation is established.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - enables cold-crank operation and withstands 42V transients without external protection |
| Output Current | Up to 6A continuous - dependent on VIN/VOUT ratio and thermal design; validated at full load in 4-layer EV kit board |
| Switching Frequency | 2.1MHz / 400kHz / 200kHz - 2.1MHz option minimizes inductor/capacitor size and avoids AM band interference |
| Quiescent Current | 95μA in standby - meets OEM requirements for always-on vehicle subsystems |
| Thermal Shutdown | 175°C with 20°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking |
| PGOOD Accuracy | ±1% window (93%–94% of VOUT) - provides precise power-rail monitoring for system-level fault detection |
| Feedback Reference | 0.800V ±1.75% - enables accurate resistor-divider programming of 3V–20V output with <±2% total regulation error |
Pinout & Package
MAX25240AFFD/VY+T is housed in a thermally enhanced 22-pin FC2QFN package (4.25mm × 4.25mm × 0.75mm) with exposed thermal pad, optimized for automotive under-hood thermal environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 | Bootstrap capacitor node for LX1 high-side driver | Requires 0.1μF ceramic cap between BST1 and LX1 to sustain gate drive during high-duty-cycle buck operation |
| SUP | Main power input for converter and internal VCC LDO | Bypassed with ≥4.7μF ceramic cap to PGND1; tolerates 42V transients |
| PGND1 / PGND2 | Power ground return paths for LS1 and LS2 FETs | Must be joined at single-point star ground with AGND to minimize noise coupling into feedback loop |
| LX1 / LX2 | H-bridge switching nodes | Connect opposite ends of power inductor; require tight layout to reduce EMI and voltage spikes |
| OUT | Regulated output terminal | Delivers up to 6A; connects to output capacitor bank and downstream loads |
| EN | High-voltage enable input | Logic-compatible up to 42V; pulls device out of 5μA shutdown state when driven high |
| FB | Feedback input for output voltage regulation | Connected to resistor divider; shorting to VCC selects fixed 5V or 11.5V output |
| COMP | Error amplifier output | Interface for RC compensation network to stabilize control loop across all operating modes |
| SPS | Spread-spectrum enable control | High = ±6% frequency dithering active; disabled automatically during external SYNC |
| SYNC | Mode selection and clock synchronization input | GND = skip mode; VCC = forced PWM; external clock = synchronized operation |
| PGOOD | Open-drain power-good indicator | Pulls low when VOUT drops below 93% of target; requires external pull-up to VCC or ≤5.5V rail |
| VCC | Internal 1.8V LDO output | Supplies internal circuitry; bypassed with ≥4.7μF ceramic cap to AGND |
| AGND | Analog reference ground | Must tie to PGND1/PGND2 at single point to prevent ground bounce in sensitive analog circuits |
Key Features
| Feature | Design Value |
|---|---|
| Integrated H-bridge with 20mΩ RDSON | Eliminates need for four discrete MOSFETs and associated gate drivers, reducing BOM count and layout area by >40% |
| Three-frequency selection (2.1MHz/400kHz/200kHz) | Enables optimization for size (2.1MHz), efficiency (400kHz), or EMI-sensitive environments (200kHz) |
| Spread-spectrum modulation (±6%) | Reduces peak radiated emissions by >10dB across fundamental and harmonic frequencies without filter redesign |
| AEC-Q100 Grade 1 (-40°C to +125°C) | Validated for under-hood automotive applications including ADAS ECUs and body control modules |
| 42V input transient tolerance with 42V-rated EN pin | Supports direct battery connection in 12V/24V systems without external TVS or clamping circuitry |
| Programmable soft-start (2.5ms) | Controls inrush current during power-up to prevent input rail collapse and downstream reset events |
Applications
| ADAS ECU Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers vision processor, radar SoC, and sensor fusion MCU in autonomous driving domain controller. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying stable 5V/11.5V core rail from variable vehicle battery (6V–16V). Use Value: Maintains regulation during cold-crank (2V) and load-dump (42V) events while delivering 6A peak current with <±2% accuracy. |
Use Scenario: Generates clean 5V rail for display controller, audio DSP, and USB hub in head-unit systems. IC Role / Device Role / Timing Role: Point-of-load regulator with PGOOD monitoring for system-level power sequencing and fault reporting. Use Value: 95μA standby IQ enables always-on voice wake-up functionality; spread-spectrum reduces EMI near sensitive RF receivers. |
| Start-Stop System Control Module | Body Electronics Gateway |
Use Scenario: Supplies microcontroller, CAN transceiver, and solenoid drivers in engine start-stop control unit. IC Role / Device Role / Timing Role: Main power converter handling wide-input transients during cranking and alternator regulation phases. Use Value: 2V–36V input range and 42V transient tolerance eliminate need for pre-regulator stage; thermal shutdown protects against sustained overloads. |
Use Scenario: Provides regulated 3.3V/5V rails for door module controllers, lighting ICs, and LIN transceivers. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC solution replacing discrete buck + boost combinations. Use Value: 22-pin FC2QFN package with exposed thermal pad achieves 22.4°C/W θJA on 4-layer EV kit board, enabling convection-only cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25239AFFD/VY+T | Same family, 2.1MHz default frequency, 8.2A current limit option | Optimized for compact designs requiring minimal external components | Select when 2.1MHz operation and lower current limit (8.2A vs 10A) align with thermal and EMI targets |
| LM61480QRNXTQ1 | Single-switch buck-boost with external FETs; 3.5V–36V input; 5A max | Requires external high-side/low-side MOSFETs and gate drivers | Choose when higher efficiency at light load or custom FET selection is required, accepting larger footprint and design complexity |
Compared with MAX25239AFFD/VY+T and LM61480QRNXTQ1, the MAX25240AFFD/VY+T offers higher 10A current limit and 6A continuous output capability in the same 22-pin FC2QFN package, making it preferable for high-power ADAS and infotainment applications where integration and board space are critical.
Availability
MAX25240AFFD/VY+T is available at Aetrix Electronics and suitable for ADAS ECU, infotainment systems, and start-stop systems requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for MAX25240AFFD/VY+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 automotive, industrial, communications, and healthcare markets with reliability-validated solutions.
The MAX25239/MAX25240 product line delivers highly integrated, AEC-Q100-qualified buck-boost converters targeting next-generation automotive power architectures requiring wide-input operation, ultra-low IQ, and robust EMI performance.
FAQ
What is the maximum continuous output current supported by the MAX25240AFFD/VY+T?
The MAX25240AFFD/VY+T supports up to 6A continuous output current depending on input-to-output voltage ratio, PCB thermal design, and ambient temperature. At 14V input and 5V output with 4-layer EV kit board, it delivers full 6A with junction temperature maintained below 125°C. Derating applies above 70°C ambient per 30mW/°C θJA specification.
Does the MAX25240AFFD/VY+T support fixed-output voltage configurations?
Yes, the MAX25240AFFD/VY+T supports fixed-output voltage operation: connecting FB directly to VCC configures 5V output (±2%), while a specific resistor divider sets 11.5V (±2%). These fixed options eliminate external feedback resistors and simplify design for standardized rails in automotive modules.
How does the SYNC pin configure operating modes on the MAX25240AFFD/VY+T?
The SYNC pin on MAX25240AFFD/VY+T selects three modes: grounding SYNC enables skip mode for ultra-low IQ at light loads; tying SYNC to VCC forces fixed-frequency PWM; applying an external clock synchronizes switching to that source within ±20% frequency tolerance and locks in two cycles.
What thermal performance can be expected from the MAX25240AFFD/VY+T in production layout?
On a standard 4-layer JEDEC board, MAX25240AFFD/VY+T achieves 33.3°C/W θJA; on a 4-layer EV kit board with optimized copper pour and thermal vias, it reaches 22.4°C/W. The 22-pin FC2QFN's exposed thermal pad must be soldered to ≥4 cm² inner-layer copper for optimal heat transfer in automotive under-hood environments.
Is the MAX25240AFFD/VY+T qualified for automotive applications?
Yes, the MAX25240AFFD/VY+T is AEC-Q100 Grade 1 qualified (-40°C to +125°C ambient), with tested reliability for 95,000 hours at TJ = +125°C and 5,000 hours at TJ = +150°C. It meets stringent automotive requirements including 42V input transients, EN pin tolerance, and thermal shutdown with hysteresis.
MAX25240AFFD/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 22-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3V (10.5V)
- Voltage - Output (Max):
- 20V
- Current - Output:
- 6A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-FC2QFN (4.25x4.25)
MAX25240AFFD/VY+T FAQ
1.How can I place an order for MAX25240AFFD/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25240AFFD/VY+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 MAX25240AFFD/VY+T reliable?
The price and inventory of MAX25240AFFD/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25240AFFD/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25240AFFD/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25240AFFD/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25240AFFD/VY+T?
MAX25240AFFD/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25240AFFD/VY+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 MAX25240AFFD/VY+T?
For technical support, including MAX25240AFFD/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25240AFFD/VY+T requirements.
6.How does Aetrix verify that MAX25240AFFD/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25240AFFD/VY+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 MAX25240AFFD/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25240AFFD/VY+T?
All MAX25240AFFD/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25240AFFD/VY+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 MAX25240AFFD/VY+T part is unused and in its original packaging.
Return procedure for MAX25240AFFD/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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