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Analog Devices Inc./Maxim Integrated MAX25240AFFG/VY+
- Part No.:
- MAX25240AFFG/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25240AFFG/VY+.pdf
- Description:
- IC REG BUCK BST ADJ/3V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
MAX25240AFFG/VY+ 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 regulation. It operates in buck, boost, or buck-boost mode automatically based on VIN/VOUT ratio and features 2.1MHz/400kHz/200kHz selectable switching frequency, 95μA standby quiescent current, and AEC-Q100 Grade 1 (−40°C to +125°C) qualification for ADAS ECU and infotainment power rails.
For engineers reviewing the MAX25240AFFG/VY+ datasheet, MAX25240AFFG/VY+ pinout, MAX25240AFFG/VY+ application, or MAX25240AFFG/VY+ equivalent, key selection criteria include its 22-pin FC2QFN package with thermally enhanced bottom-side thermal pad, ±6% spread-spectrum EMI reduction, PGOOD open-drain monitor, EN pin rated to 42V, and dual current-limit options (8.2A/10A) enabling robust cold-crank and load-dump resilience in automotive body electronics.
Technical Context
The MAX25240AFFG/VY+ implements peak-current-mode control with automatic mode transitions between buck, boost, and buck-boost based on real-time VIN/VOUT ratio and internally preset duty-cycle limits (DMAX = 0.73 at 2.1MHz). Its H-bridge architecture uses four internal MOSFETs (HS1/LS1/HS2/LS2) with 20mΩ typical RDSON, enabling seamless operation across wide input-output differentials without external mode control logic.
It integrates a 1.8V VCC LDO regulator powered from VIN or VOUT, supports SYNC-driven FPWM/skip mode selection and external clock synchronization within ±20% frequency tolerance, and embeds cycle-by-cycle current limiting, thermal shutdown at 175°C, and output overvoltage protection with 108% threshold and 3% hysteresis - all verified under AEC-Q100 stress conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - supports cold-crank (2V) and 42V transients without external clamping |
| Output Current | Up to 6A continuous - derated by VIN/VOUT ratio and thermal design; validated at full load in 4-layer EV kit |
| Switching Frequency | 2.1MHz / 400kHz / 200kHz - 2.1MHz enables ≤1μH inductors and avoids AM band interference |
| Quiescent Current | 95μA in standby - meets OEM requirements for always-on vehicle modules |
| Current Limit | 10A typical - protects against short-circuit with hiccup recovery after 5ms off-time |
| PGOOD Threshold | 94% rising / 93% falling of VOUT - provides precise power-rail monitoring with 40μs debounce |
| Thermal Shutdown | 175°C with 20°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking |
Pinout & Package
MAX25240AFFG/VY+ is housed in a 4.25mm × 4.25mm × 0.75mm, 22-pin FC2QFN package with exposed thermal pad (bottom-side) and RoHS-compliant finish. The package supports high-power density layout with low θJCb = 6.4°C/W on 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 | Bootstrap capacitor node for LX1 high-side driver | Requires 0.1μF ceramic cap to LX1; enables 100ns minimum ON time in buck mode |
| SUP | Main power input for converter and internal VCC LDO | Bypass with ≥4.7μF ceramic to PGND1; withstands 42V transients |
| PGND1 / PGND2 | Power ground return paths for LS1 and LS2 FETs | Must be joined at single star point with AGND to minimize noise coupling |
| LX1 / LX2 | H-bridge switching nodes | Connect to opposite ends of power inductor; support <1.5ns rise/fall times |
| OUT | Regulated output voltage terminal | Delivers up to 6A; supports fixed (5V/11.5V) or resistor-divider-adjusted (3V–20V) regulation |
| EN | High-voltage enable input | Logic-high >1.3V enables device; tolerates up to 42V - no level-shifter needed from battery |
| FB | Feedback input for output voltage sensing | Connect to resistor divider; 0.800V reference enables ±2% output accuracy |
| COMP | Error amplifier output | Interface for RC compensation network to stabilize loop across all operating modes |
| SPS | Spread-spectrum enable control | High = ±6% frequency dithering active; disabled during external SYNC |
| SYNC | Mode select and clock sync input | GND = skip mode; VCC = FPWM; external clock = synchronization within ±20% freq tolerance |
| PGOOD | Open-drain power-good indicator | Pull-up required; asserts low if VOUT drops below 93% of target; high-Z above 94% |
| VCC | Internal 1.8V LDO output | Bypass with ≥4.7μF ceramic; powers internal logic and drivers; self-biasing from VIN or VOUT |
| AGND | Analog ground reference | Star-connected with PGND1/PGND2; separates noise-sensitive analog circuitry from power paths |
Key Features
| Feature | Design Value |
|---|---|
| Integrated H-bridge FETs | 20mΩ typical RDSON enables high-efficiency 6A operation without external MOSFETs or gate drivers |
| Triple-frequency selection | 2.1MHz/400kHz/200kHz options allow trade-off between component size, efficiency, and EMI performance |
| Automotive-grade reliability | AEC-Q100 Grade 1 qualified with 150°C max junction temperature and 95,000-hour lifetime at 125°C |
| Robust protection suite | Includes undervoltage lockout (4.2V rise), overvoltage protection (108% VOUT), thermal shutdown (175°C), and hiccup-mode current limit |
| Low-noise operation | Spread-spectrum modulation (±6%) and 2.1MHz option suppress radiated EMI without added filters |
Applications
| ADAS ECU Power Supply | Infotainment System Rail |
|---|---|
Use Scenario: Powers vision processor SoCs and radar sensor interfaces in forward collision warning and lane departure systems. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/11.5V from vehicle battery (6V–16V nominal, down to 2V cold-crank). Use Value: Maintains uninterrupted operation during engine start via 2V min input and 42V transient tolerance; PGOOD enables system-level fault logging. | Use Scenario: Supplies display controller, audio DSP, and USB-C PD interface in head-unit and digital cockpit systems. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V battery to programmable 3.3V–12V rails with dynamic voltage scaling support. Use Value: 95μA standby current extends battery life in accessory-off mode; 2.1MHz switching allows compact 1206-size magnetics and capacitors. |
| Body Control Module (BCM) | Start-Stop System Interface |
Use Scenario: Powers microcontroller, CAN transceivers, and LED drivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + boost stages for 5V/3.3V generation across varying battery voltages. Use Value: Eliminates external mode-switching logic and reduces BOM count by 7+ components; thermally enhanced FC2QFN sustains 6A at +105°C ambient. | Use Scenario: Regulates auxiliary 5V rail for start-stop logic, battery sensor, and intelligent alternator control during cranking. IC Role / Device Role / Timing Role: High-reliability buck-boost converter maintaining regulated output during 2V–6V battery dips and 24V regenerative spikes. Use Value: Withstands 42V load-dump transients without external TVS; EN pin compatibility to 42V simplifies direct battery connection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25239AFFG/VY+ | Same 22-pin FC2QFN package and pinout; differs only in factory-trimmed switching frequency (2.1MHz vs. 400kHz) | Optimized for ultra-low EMI and minimal component size; preferred where board space is constrained | Select when 2.1MHz operation is required for AM-band immunity or smallest possible inductor/capacitor footprint |
| LM61480QRNXTQ1 | Single-switch buck-boost with external FETs; 3.5V–36V input; 6A max; no integrated H-bridge | Requires external MOSFETs and gate drivers; lacks spread-spectrum and PGOOD with hysteresis | Choose when higher VIN min (3.5V) is acceptable and design flexibility with discrete FETs outweighs integration benefits |
Compared with MAX25239AFFG/VY+, the MAX25240AFFG/VY+ offers identical packaging and protection but targets 2.1MHz operation for EMI-sensitive ADAS domains, while LM61480QRNXTQ1 trades integration for external FET control - making MAX25240AFFG/VY+ optimal for space-constrained, AEC-Q100-compliant 6A point-of-load designs requiring zero external power switches.
Availability
MAX25240AFFG/VY+ is available at Aetrix Electronics and suitable for ADAS ECU, infotainment systems, and body electronics requiring stable component supply with automotive-grade traceability and long-term lifecycle assurance.
Supply support for MAX25240AFFG/VY+ 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.
The MAX25240AFFG/VY+ belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding 12V/24V vehicle subsystems requiring high efficiency, ultra-low quiescent current, and AEC-Q100 reliability across −40°C to +125°C.
FAQ
What is the maximum continuous output current supported by the MAX25240AFFG/VY+?
The MAX25240AFFG/VY+ delivers up to 6A continuous output current, with actual capability dependent on input-to-output voltage ratio, switching frequency, PCB thermal design, and ambient temperature. At 14V input and 5V output with 2.1MHz operation on a 4-layer EV kit board, full 6A is sustainably achievable with proper heatsinking and layout per Analog Devices' recommended land pattern.
Does the MAX25240AFFG/VY+ support both fixed and adjustable output voltages?
Yes, the MAX25240AFFG/VY+ supports fixed 5V or 11.5V outputs (by connecting FB to VCC) and externally adjustable outputs from 3V to 20V (using a resistor divider from OUT to AGND). The internal 0.800V feedback reference ensures ±2% output accuracy across temperature and line/load conditions, as verified in the Electrical Characteristics table.
How does the MAX25240AFFG/VY+ handle input voltage transients common in automotive environments?
The MAX25240AFFG/VY+ tolerates input transients up to 42V and features an EN pin rated to 42V, eliminating need for external clamping. Its 2V–36V operating range covers cold-crank (down to 2V) and load-dump events. Internal protections include undervoltage lockout (4.2V rising threshold), overvoltage protection (108% of VOUT), and thermal shutdown - all AEC-Q100 qualified for automotive durability.
Can the MAX25240AFFG/VY+ be synchronized to an external clock source?
Yes, the MAX25240AFFG/VY+ supports external clock synchronization via the SYNC pin. When driven with a valid clock signal within ±20% of its internal frequency (e.g., 1.68–2.52MHz for 2.1MHz variant), it locks within two cycles. During loss of external clock, it automatically reverts to internal oscillator - ensuring seamless operation in noisy or variable-clock environments.
What thermal performance can be expected from the MAX25240AFFG/VY+ in a standard 4-layer PCB layout?
In a standard 4-layer JEDEC board configuration, the MAX25240AFFG/VY+ exhibits θJA = 33.3°C/W and θJCb = 6.4°C/W. With proper thermal pad soldering and copper pour, it sustains 6A output at +70°C ambient without derating. For higher ambient or continuous full-load operation, Analog Devices recommends using the 4-layer EV kit land pattern (90-100137) and minimizing thermal resistance to the PCB ground plane.
MAX25240AFFG/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 22-PowerWFQFN
- Packaging:
- Tray
- 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)
MAX25240AFFG/VY+ FAQ
1.How can I place an order for MAX25240AFFG/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25240AFFG/VY+ 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 MAX25240AFFG/VY+ reliable?
The price and inventory of MAX25240AFFG/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25240AFFG/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25240AFFG/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25240AFFG/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25240AFFG/VY+?
MAX25240AFFG/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25240AFFG/VY+ 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 MAX25240AFFG/VY+?
For technical support, including MAX25240AFFG/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25240AFFG/VY+ requirements.
6.How does Aetrix verify that MAX25240AFFG/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25240AFFG/VY+ 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 MAX25240AFFG/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25240AFFG/VY+?
All MAX25240AFFG/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25240AFFG/VY+, 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 MAX25240AFFG/VY+ part is unused and in its original packaging.
Return procedure for MAX25240AFFG/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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