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Analog Devices Inc./Maxim Integrated MAX25240AFFG/VY+T
- Part No.:
- MAX25240AFFG/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25240AFFG/VY+T.pdf
- Description:
- IC REG BUCK BST ADJ/3V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,133
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Product details
Overview
MAX25240AFFG/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 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 start-stop systems.
For engineers reviewing the MAX25240AFFG/VY+T datasheet, MAX25240AFFG/VY+T pinout, MAX25240AFFG/VY+T application, or MAX25240AFFG/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 (±6%), and thermal shutdown at 175°C with 20°C hysteresis.
Technical Context
The MAX25240AFFG/VY+T implements peak-current-mode control with automatic mode transitions between buck, buck-boost, and boost based on real-time VIN/VOUT ratio and internally preset duty-cycle limits (DMAX = 0.73 for 2.1MHz variant). 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 SUP or OUT, supports SYNC-driven FPWM/skip mode selection and external clock synchronization (±20% tolerance), and includes programmable spread-spectrum modulation via SPS pin-disabled only during external sync-to reduce conducted and radiated EMI without compromising regulation accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - supports cold-crank (2V) and load-dump (42V transient tolerant) conditions in automotive environments |
| Output Current | Up to 6A continuous - dependent on VIN/VOUT ratio and thermal design; validated at full load across −40°C to +125°C |
| Switching Frequency | 2.1MHz / 400kHz / 200kHz - 2.1MHz enables compact 1μH inductors and avoids AM band interference |
| Quiescent Current | 95μA in standby - meets OEM requirements for always-on subsystems like infotainment wake-up circuits |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor PCB heatsinking in enclosed ECUs |
| PGOOD Accuracy | ±1% window (93%–94% of VOUT) - provides reliable power-rail monitoring for system-level fault detection |
| Current Limit | 10A typical - cycle-by-cycle protection prevents damage during short-circuit events at output |
Pinout & Package
MAX25240AFFG/VY+T is housed in a thermally enhanced 22-pin FC2QFN package (4.25mm × 4.25mm × 0.75mm) with exposed thermal pad, optimized for high-power density and low θJA (33.3°C/W on JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 | Bootstrap capacitor node for LX1 | Supplies gate drive voltage for HS1; requires 0.1μF ceramic cap between BST1 and LX1 |
| SUP | Main power input | Accepts 2V–36V input; powers internal circuitry and VCC LDO; bypass with ≥4.7μF ceramic to PGND1 |
| PGND1 / PGND2 | Power ground return paths | Separate ground pins for buck-side (LS1) and boost-side (LS2) FETs; must be joined at single star point |
| LX1 / LX2 | H-bridge switching nodes | Connect opposite ends of power inductor; carry high di/dt currents; require tight layout and Kelvin grounding |
| OUT | Regulated output | Delivers up to 6A; supports fixed (5V/11.5V) or adjustable (3V–20V) regulation via FB resistor divider |
| EN | Enable control | High-voltage-tolerant (up to 42V); active-high; pulls device from 5μA shutdown into full operation |
| FB | Feedback input | Sets output voltage: tie to VCC for fixed 5V/11.5V, or use resistor divider for 3V–20V programmability |
| COMP | Error amplifier output | Connect RC compensation network to AGND to stabilize loop response across all operating modes |
| SPS | Spread-spectrum enable | Logic-high enables ±6% frequency dithering to reduce EMI peaks; disabled during external SYNC |
| SYNC | Mode control & clock sync | Ground = skip mode; VCC = forced PWM; external clock = synchronization (±20% frequency lock) |
| PGOOD | Open-drain power-good indicator | Asserts low when VOUT drops below 93% of target; requires external pull-up to VCC or ≤5.5V rail |
| VCC | Internal 1.8V LDO output | Powers internal logic; bypass with ≥4.7μF ceramic to AGND; sourced from SUP or OUT depending on VOUT level |
| AGND | Analog reference ground | Must be connected to PGND1 and PGND2 at single-point star ground to minimize noise coupling into FB/COMP |
Key Features
| Feature | Design Value |
|---|---|
| Integrated H-bridge FETs | Eliminates need for 4 external MOSFETs and associated gate drivers, reducing BOM count and layout complexity in space-constrained ECUs |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation with 95,000-hour lifetime at TJ = +125°C, meeting automotive reliability standards |
| Three-frequency selection | Enables trade-off between size (2.1MHz), efficiency (400kHz), and EMI (200kHz), without changing external components |
| Programmable spread spectrum | Reduces peak EMI by spreading energy across ±6% bandwidth-critical for CISPR 25 Class 5 compliance in infotainment modules |
| Auto mode transition logic | Seamlessly shifts between buck/boost/buck-boost without external control or firmware intervention, maintaining regulation across wide VIN transients |
| Low IQ standby mode | 95μA supply current enables always-on functionality in body electronics while minimizing battery drain during vehicle sleep states |
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 under cold-crank (2V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/11.5V to safety-critical compute blocks with PGOOD monitoring for ASIL-B diagnostics. Use Value: Maintains regulation during engine cranking and alternator transients, eliminating need for external pre-regulators or hold-up capacitors. | Use Scenario: Supplies core voltage to multimedia SoC and display controller in head-unit, requiring low-noise, always-on capability with fast wake-up from deep sleep. IC Role / Device Role / Timing Role: Main PMIC providing 3.3V/5V rails with 95μA IQ standby and 2.5ms soft-start to prevent inrush-induced brownouts during boot. Use Value: Enables instant-on user experience while meeting OEM battery leakage budgets (<100μA total system sleep current). |
| Body Control Module (BCM) | Start-Stop System Auxiliary Rail |
Use Scenario: Powers CAN transceivers, LIN gateways, and LED drivers in centralized BCM, operating across wide temperature and input voltage ranges. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + boost stages, with EN-controlled sequencing and thermal foldback for overtemperature protection. Use Value: Reduces PCB area by >40% versus dual-converter approach and simplifies thermal management with single θJA metric. | Use Scenario: Generates stable 5V rail for microcontroller and sensors during engine restart, where battery voltage dips to 2V–6V during cranking. IC Role / Device Role / Timing Role: Buck-boost regulator with 2V startup capability and hiccup-mode short-circuit protection to survive repeated restart cycles. Use Value: Eliminates risk of MCU reset or sensor dropout during stop-start events, improving system robustness and driver experience. |
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+T | Same family, 8.2A current limit option; identical pinout and package; fixed 5V/11.5V outputs only | Preferred where lower current limit suffices and fixed outputs simplify design | Select for cost-sensitive ADAS camera modules requiring 5V at ≤4A with minimal external components |
| LM61480-Q1 (TI) | Single-switch buck-boost with external FETs; 4.5V–36V input; 5A max; no integrated H-bridge | Requires external high-side/low-side FETs and gate drivers; lacks auto mode transition logic | Choose when higher efficiency at light loads is critical and layout space allows discrete FET placement |
Compared with MAX25239AFFG/VY+T and LM61480-Q1, the MAX25240AFFG/VY+T offers higher current capability (10A vs 8.2A/5A), integrated H-bridge architecture eliminating external FETs, and seamless buck/boost/buck-boost transitions-making it optimal for compact, high-reliability automotive power rails where board space and functional safety are prioritized over ultra-low-light-load efficiency.
Availability
MAX25240AFFG/VY+T is available at Aetrix Electronics and suitable for ADAS ECU, infotainment systems, and start-stop systems requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for MAX25240AFFG/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.
The MAX252xx product line delivers highly integrated, AEC-Q100-qualified DC-DC converters specifically engineered for automotive power architectures demanding wide input range, high reliability, and EMI robustness in ADAS, body electronics, and electrification systems.
FAQ
What is the maximum continuous output current supported by the MAX25240AFFG/VY+T?
The MAX25240AFFG/VY+T supports up to 6A continuous output current, verified across the full −40°C to +125°C temperature range and dependent on input-to-output voltage ratio, switching frequency, and PCB thermal design. At 2.1MHz and moderate VIN/VOUT differentials, 6A is achievable with proper layout and heatsinking; derating applies at extremes such as 2V input or 20V output.
Does the MAX25240AFFG/VY+T support both fixed and adjustable output voltages?
Yes, the MAX25240AFFG/VY+T supports both configurations: connect FB directly to VCC for factory-trimmed fixed outputs of 5.0V or 11.5V, or use an external resistor divider between OUT and AGND to set any output from 3V to 20V with ±2% regulation accuracy. The feedback reference voltage is 0.800V (min 0.786V, max 0.814V).
How does the MAX25240AFFG/VY+T handle input voltage transients common in automotive systems?
The MAX25240AFFG/VY+T tolerates input transients up to 42V and features SUP undervoltage lockout (UVLO) that turns on at 4.45V (rising) and shuts down at 1.9V (falling), ensuring robust operation during cold-crank (down to 2V) and load-dump events. Its EN pin is also rated to 42V, allowing direct connection to battery without level-shifting.
Can the MAX25240AFFG/VY+T be synchronized to an external clock source?
Yes, the MAX25240AFFG/VY+T supports external clock synchronization via the SYNC pin, accepting input frequencies within ±20% of its internal switching frequency (200kHz/400kHz/2.1MHz). It locks to the external clock within two cycles and reverts to internal oscillation if the external signal is absent for more than two periods-enabling EMI reduction through deterministic frequency alignment.
What thermal protection mechanisms are built into the MAX25240AFFG/VY+T?
The MAX25240AFFG/VY+T includes thermal shutdown at 175°C (typical) with 20°C hysteresis, cycle-by-cycle current limiting, and hiccup-mode recovery after sustained overcurrent. Its 22-pin FC2QFN package features an exposed thermal pad and low θJA (33.3°C/W on JEDEC board), enabling reliable 6A operation in automotive underhood environments when properly mounted to a thermal plane.
MAX25240AFFG/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)
MAX25240AFFG/VY+T FAQ
1.How can I place an order for MAX25240AFFG/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25240AFFG/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 MAX25240AFFG/VY+T reliable?
The price and inventory of MAX25240AFFG/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 MAX25240AFFG/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25240AFFG/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25240AFFG/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25240AFFG/VY+T?
MAX25240AFFG/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25240AFFG/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 MAX25240AFFG/VY+T?
For technical support, including MAX25240AFFG/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25240AFFG/VY+T requirements.
6.How does Aetrix verify that MAX25240AFFG/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25240AFFG/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 MAX25240AFFG/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25240AFFG/VY+T?
All MAX25240AFFG/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25240AFFG/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 MAX25240AFFG/VY+T part is unused and in its original packaging.
Return procedure for MAX25240AFFG/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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