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Analog Devices Inc./Maxim Integrated MAX25240AFFF/VY+T
- Part No.:
- MAX25240AFFF/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25240AFFF/VY+T.pdf
- Description:
- IC REG BUCK BST ADJ/3V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,528
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Product details
Overview
MAX25240AFFF/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 while maintaining fixed or adjustable 3V–20V output regulation. It supports 2.1MHz/400kHz/200kHz switching frequencies, features 95μA standby quiescent current, and includes PGOOD, spread-spectrum EMI reduction, and AEC-Q100 Grade 1 (−40°C to +125°C) qualification for ADAS ECU power rails.
For engineers reviewing the MAX25240AFFF/VY+T datasheet, MAX25240AFFF/VY+T pinout, MAX25240AFFF/VY+T application, or MAX25240AFFF/VY+T equivalent, key selection criteria include input transient tolerance (42V), EN pin voltage rating (up to 42V), thermal performance in FC2QFN packages, cycle-by-cycle current limiting, and compatibility with cold-crank (2V start) and load-dump conditions in automotive power systems.
Technical Context
The MAX25240AFFF/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 uses four integrated MOSFETs (HS1/LS1/HS2/LS2) with 20mΩ typical RDSON, enabling seamless mode transitions without external control logic.
It integrates a 1.8V VCC LDO regulator powered from SUP or OUT, a programmable spread-spectrum modulator (±6%), and a dual-function SYNC pin supporting skip mode, forced PWM, or external clock synchronization with ±20% frequency tolerance and two-cycle lock time. The PGOOD output provides open-drain monitoring with 93%/94% rising/falling thresholds referenced to VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - supports cold-crank startup and full automotive battery range including transients up to 42V |
| Output Current | Up to 6A continuous - dependent on VIN/VOUT ratio and thermal design; validated at 14V IN / 5V OUT |
| Switching Frequencies | 2.1MHz / 400kHz / 200kHz - selectable via part variant; 2.1MHz enables compact 1μH inductors and avoids AM band |
| Quiescent Current | 95μA in standby - meets OEM low-power requirements during vehicle sleep mode |
| Thermal Rating | −40°C to +125°C junction - AEC-Q100 Grade 1 qualified for under-hood deployment |
| Protection Features | UVLO, OVP, thermal shutdown, cycle-by-cycle current limit, hiccup mode - ensures robust operation in harsh environments |
| Feedback Accuracy | ±2% over temperature - regulated via 0.800V internal reference (VFB = 0.800V ±14mV) |
Pinout & Package
MAX25240AFFF/VY+T is housed in a thermally enhanced 22-pin FC2QFN package (4.25mm × 4.25mm × 0.75mm) with exposed thermal pad. Pin 1 is BST1; pins 5 and 6 are PGND1; pins 9 and 10 are PGND2; pin 22 is AGND. All ground pins must be connected at a single star point.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 | Bootstrap capacitor node for LX1 | Connects 0.1μF ceramic cap between BST1 and LX1 to drive HS1 gate above VIN |
| SUP | Main power input | Supplies buck-boost converter core and internal VCC LDO; bypass with ≥4.7μF ceramic to PGND1 |
| PGND1 / PGND2 | Power ground return paths | Separate low-side FET grounds; must be joined at single-point star ground with AGND |
| LX1 / LX2 | H-bridge switching nodes | Connect power inductor between LX1 and LX2; handle high di/dt and require tight layout |
| OUT | Regulated output | Delivers up to 6A; requires low-ESR output capacitor and proper feedback divider |
| EN | Enable control | High-voltage-tolerant (up to 42V); asserts device from shutdown when pulled >1.3V |
| FB | Voltage feedback input | Connects to resistor divider from OUT to AGND; ties to VCC for fixed 5V/11.5V options |
| COMP | Error amplifier output | Interface for RC compensation network to stabilize loop response per application requirements |
| SPS | Spread-spectrum enable | High = ±6% frequency modulation active; disabled during external SYNC operation |
| SYNC | Mode control & sync input | GND = skip mode; VCC = forced PWM; external clock = synchronization with ±20% tolerance |
| PGOOD | Open-drain power-good indicator | Pulls low when VOUT <93% of target; high-impedance when VOUT >94%; active during soft-start/shutdown |
| VCC | Internal 1.8V LDO output | Supplies internal circuitry; bypass with ≥4.7μF ceramic to AGND; powers itself from SUP or OUT |
| AGND | Analog reference ground | Must connect to PGND1/PGND2 at single-point star ground to minimize noise coupling into FB/COMP |
Key Features
| Feature | Design Value |
|---|---|
| Integrated H-bridge FETs | 20mΩ typical RDSON reduces conduction loss and eliminates need for 4 external MOSFETs and drivers |
| Three-frequency option | Selectable 2.1MHz/400kHz/200kHz allows trade-off between component size (2.1MHz) and efficiency (400kHz) |
| Spread-spectrum modulation | ±6% frequency dithering lowers peak EMI emissions without requiring additional filtering components |
| Automotive-grade reliability | AEC-Q100 Grade 1 qualification, 42V transient tolerance, and −40°C to +125°C operation ensure under-hood robustness |
| Low-quiescent-current modes | 95μA standby and 5μA shutdown meet OEM requirements for always-on vehicle networks and infotainment memory retention |
Applications
| ADAS ECU Power Supply | Infotainment System Rail |
|---|---|
Use Scenario: Powers radar sensor SoCs and camera modules in autonomous driving ECUs where input voltage varies from 2V (cold crank) to 36V (load dump). IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/12V rail with fast transient response and PGOOD monitoring for system health checks. Use Value: Eliminates need for pre-regulator stages; maintains regulation across full automotive battery envelope without brownouts or resets. | Use Scenario: Supplies display controllers and audio processors in head-unit systems subject to wide input swings and EMI-sensitive analog sections. IC Role / Device Role / Timing Role: Point-of-load regulator with spread-spectrum enabled to reduce conducted/radiated noise near RF receivers and touch sensors. Use Value: Achieves CISPR-25 Class 5 compliance with minimal external filtering due to integrated EMI mitigation. |
| Body Control Module (BCM) | Start-Stop System Interface |
Use Scenario: Powers microcontrollers and CAN transceivers in door modules and lighting controllers where space and thermal constraints limit heatsink use. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC converter with 22-pin FC2QFN package and θJA = 33.3°C/W on JEDEC board. Use Value: Enables high-density PCB layouts with no external FETs or complex thermal vias required for 6A loads. | Use Scenario: Interfaces with 12V lead-acid battery in vehicles with engine start-stop functionality, enduring repeated 2V–16V transients during cranking. IC Role / Device Role / Timing Role: Input-tolerant regulator providing clean 3.3V/5V supply to MCU and sensors during deep discharge events. Use Value: Maintains system operation below 4.5V input-unlike standard buck converters-preventing unexpected shutdowns during cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25239AFFF/VY+T | Same package and pinout; fixed 5V/11.5V output only (no adjustable FB option) | Best for cost-sensitive designs requiring only factory-set outputs without external resistors | Select when fixed-output simplicity outweighs flexibility; shares identical thermal and protection specs |
| LM61480-Q1 | Single-switch buck-boost (not H-bridge); 3.5V–36V IN; 1.2V–20V adjustable OUT; 8A max | Requires external flyback diode or synchronous rectifier; less efficient in buck-boost transition region | Choose for higher current needs where layout area permits external components and lower BOM count is prioritized |
Compared with MAX25239AFFF/VY+T and LM61480-Q1, the MAX25240AFFF/VY+T uniquely combines adjustable output voltage, integrated H-bridge topology, and 2.1MHz capability in a 4.25mm² footprint-enabling smaller magnetics, tighter regulation during mode transitions, and simplified layout versus controller-based alternatives.
Availability
MAX25240AFFF/VY+T is available at Aetrix Electronics and suitable for ADAS ECU power supplies, infotainment system rails, and body electronics requiring stable component supply across automotive production lifecycles.
Supply support for MAX25240AFFF/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 consumer markets with precision power, sensing, and interface solutions.
The MAX25240 belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding under-hood and cockpit applications requiring AEC-Q100 qualification, wide input range, and integrated protection.
FAQ
What is the maximum input voltage transient tolerance for MAX25240AFFF/VY+T?
The MAX25240AFFF/VY+T tolerates input transients up to 42V on the SUP and EN pins, meeting ISO 7637-2 Pulse 5a requirements for automotive load-dump events. This rating is validated per Absolute Maximum Ratings table and applies continuously during normal operation-not just as a stress limit-ensuring reliable function during battery disconnection events.
Does MAX25240AFFF/VY+T support both fixed and adjustable output voltages?
Yes, MAX25240AFFF/VY+T supports both configurations: tie FB to VCC for factory-trimmed fixed outputs (5.0V or 11.5V), or connect FB to a resistor divider from OUT to AGND to set any output between 3V and 20V. The internal 0.800V reference and ±2% accuracy over temperature enable precise regulation in either mode.
How does the SYNC pin configure operating modes on MAX25240AFFF/VY+T?
The SYNC pin on MAX25240AFFF/VY+T selects three distinct modes: grounding SYNC enables skip mode for ultra-low quiescent current at light loads; pulling SYNC to VCC forces fixed-frequency PWM; applying an external clock synchronizes switching within ±20% frequency tolerance. Mode selection is immediate and requires no configuration registers.
What thermal performance can be expected from MAX25240AFFF/VY+T in its 22-pin FC2QFN package?
In the 22-pin FC2QFN (4.25mm × 4.25mm), MAX25240AFFF/VY+T achieves θJA = 33.3°C/W on a 4-layer JEDEC board and θJB = 7.6°C/W to the PCB. With proper thermal vias under the exposed pad, it sustains 6A output at +85°C ambient without derating-validated by thermal characterization data in the datasheet's Package Information section.
Is MAX25240AFFF/VY+T compatible with 2.1MHz operation and what are the layout implications?
Yes, MAX25240AFFF/VY+T is fully rated for 2.1MHz operation, enabling use of sub-1μH inductors and reducing output ripple. Layout requires minimized LX1/LX2 loop area, tight BST1/BST2 capacitor placement adjacent to respective LX pins, and separate AGND/PGND routing to prevent noise coupling into the COMP and FB nodes.
MAX25240AFFF/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 (11.5V)
- Voltage - Output (Max):
- 20V
- Current - Output:
- 6A
- Frequency - Switching:
- 400kHz
- 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)
MAX25240AFFF/VY+T FAQ
1.How can I place an order for MAX25240AFFF/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25240AFFF/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 MAX25240AFFF/VY+T reliable?
The price and inventory of MAX25240AFFF/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 MAX25240AFFF/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25240AFFF/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25240AFFF/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25240AFFF/VY+T?
MAX25240AFFF/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25240AFFF/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 MAX25240AFFF/VY+T?
For technical support, including MAX25240AFFF/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25240AFFF/VY+T requirements.
6.How does Aetrix verify that MAX25240AFFF/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25240AFFF/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 MAX25240AFFF/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25240AFFF/VY+T?
All MAX25240AFFF/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25240AFFF/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 MAX25240AFFF/VY+T part is unused and in its original packaging.
Return procedure for MAX25240AFFF/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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