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Analog Devices Inc./Maxim Integrated MAX25254AFDC/VY+T
- Part No.:
- MAX25254AFDC/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25254AFDC/VY+T.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,373
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Product details
Overview
MAX25254AFDC/VY+T from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated 8A high-side/low-side MOSFETs per channel, 3V–36V input range, and ASIL B safety compliance. It delivers up to 8A per channel in PWM mode at 400kHz, supports dual-phase operation for 16A output, and features 12µA no-load quiescent current - enabling front-camera and telematics power supplies in harsh automotive environments.
For engineers reviewing the MAX25254AFDC/VY+T datasheet, MAX25254AFDC/VY+T pinout, MAX25254AFDC/VY+T application, or MAX25254AFDC/VY+T equivalent, key selection criteria include its AEC-Q100 qualification, 23-pin FC2QFN package, dual-phase synchronization via SYNC/SYNCOUT, ±10% current sharing accuracy, and fixed/adjustable output configuration (0.8V–14V) with PGOOD monitoring.
Technical Context
The MAX25254AFDC/VY+T implements two independent buck regulators sharing a common BIAS LDO and thermal monitoring circuitry, each with programmable switching frequency (200kHz/400kHz/1MHz/2MHz), 24ns minimum on-time, and dropout operation up to 99% duty cycle. Its MAXQ® power architecture ensures precision transient response and stable phase margin across load steps.
Dual-phase operation is enabled by synchronizing two MAX25254D/MAX25255D ICs via SYNCOUT→SYNC connection with 90° phase offset, while VEA node tying enables current balancing. The device operates in forced-PWM (FPWM) or skip mode, with spread-spectrum EMI reduction active only in internal-oscillator mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V absolute max); supports cold-crank and load-dump conditions in automotive systems. |
| Output Current per Channel | Up to 8A continuous at 400kHz; derated to 6A at 2MHz for thermal management. |
| Quiescent Current | 12µA (typ) with one channel enabled; enables always-on subsystems without battery drain. |
| Switching Frequency | 200kHz/400kHz/1MHz/2MHz selectable; 400kHz balances efficiency and component size for 8A loads. |
| PGOOD Accuracy | ±1% overvoltage/undervoltage threshold (MAX25254 variant); enables reliable rail monitoring in safety-critical paths. |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis; prevents permanent damage during sustained overload. |
| Package | 23-pin FC2QFN (4.50mm × 5.75mm); optimized for high-power density and thermal dissipation in compact layouts. |
Pinout & Package
MAX25254AFDC/VY+T uses a 23-pin FC2QFN package (4.50mm × 5.75mm) with exposed thermal pad. Pin 1 is SYNC; pins 6 and 9 are PGND2 and PGND1 respectively; pins 3 and 12 are BST2/BST1; pins 4 and 11 are LX2/LX1; pins 15 and 23 are open-drain PGOOD1/PGOOD2; pins 16 and 22 are OUT1/FB1 and OUT2/FB2; pin 18 is VEA for multiphase current balancing; pin 17 is TEMP for die temperature sensing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (Pin 1) | Synchronization control input | Drives high for FPWM mode; low for skip mode; accepts external clock for frequency locking. |
| EN1/EN2 (Pins 13, 2) | Independent enable inputs | High-voltage tolerant (≥1.8V); allow direct battery tie for always-on buck channels. |
| LX1/LX2 (Pins 11, 4) | Switch-node connections | Drive external inductors; high-impedance when respective channel disabled. |
| PGOOD1/PGOOD2 (Pins 15, 23) | Open-drain power-good outputs | Pull low during startup, UV/OV fault, or thermal shutdown; require external pull-up. |
| VEA (Pin 18) | Error amplifier output | Tied between primary/secondary ICs in quad-phase to balance current sharing and share voltage loop. |
| TEMP (Pin 17) | Digital temperature sensor output | 0.75V at +25°C, 1.0V at +125°C; enables real-time die thermal monitoring in FPWM mode. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck with integrated FETs | Eliminates 4 external MOSFETs and gate drivers; reduces BOM count and layout area for dual-rail systems. |
| ASIL B–compliant diagnostics (MAX25255 variant) | This MAX25254AFDC/VY+T part lacks redundant reference and die-temp monitor enable in ASIL mode, but retains OV/UV protection with ±1% accuracy. |
| Multiphase capability (dual/quad) | Enables 16A dual-phase (single IC) or 32A quad-phase (two ICs) without external controllers or complex timing circuits. |
| Ultra-low quiescent current (12µA) | Supports >1-year battery life in always-on automotive modules such as ADAS cameras and infotainment wake-up circuits. |
| Spread-spectrum EMI reduction | ±6% frequency modulation lowers peak radiated emissions, easing CISPR 25 Class 5 compliance without added shielding. |
Applications
| Front-Camera Power Supply | Telematics Module Power |
|---|---|
Use Scenario: Powers image sensor, ISP, and interface circuitry in automotive front-facing ADAS camera under wide input voltage (6V–16V battery). IC Role / Device Role / Timing Role: Dual-buck regulator delivering 1.2V core and 3.3V I/O rails with independent enable and PGOOD monitoring. Use Value: 99% dropout operation maintains regulation during cold-crank; 12µA IQ prevents battery depletion during vehicle sleep mode. | Use Scenario: Supplies 5V and 3.3V rails to LTE modem, GNSS receiver, and MCU in vehicle telematics control unit (TCU). IC Role / Device Role / Timing Role: Dual-channel DC-DC converter with synchronized 180° phase shift to reduce input ripple and EMI. Use Value: Dual-phase operation cuts input capacitor RMS current by ~30%, allowing smaller 4.7µF ceramic input caps instead of bulk electrolytics. |
| Head Unit Front-End Supply | Industrial Control System PSU |
Use Scenario: Generates 12V and 5V rails for display backlight, audio amplifier, and USB-C PD controller in automotive head unit. IC Role / Device Role / Timing Role: High-voltage buck converter with EN1/EN2 enabling independent sequencing of 12V and 5V domains. Use Value: 36V max input withstands 42V load-dump transients; PGOOD signals feed system supervisor for graceful shutdown. | Use Scenario: Provides isolated 24V-to-5V/3.3V conversion for PLC I/O modules operating in -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Automotive-qualified dual buck delivering stable outputs despite wide industrial input variation and thermal cycling. Use Value: AEC-Q100 Grade 0 rating and 175°C thermal shutdown ensure reliability in unventilated enclosures with minimal heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25255AFDC/VY+T | ASIL B–certified with redundant reference, die-temp monitor, and programmable OV/UV thresholds (±1% accuracy vs. MAX25254's ±3%). | Required for ISO 26262 ASIL B–compliant safety islands; not needed for non-safety-critical dual-rail supplies. | Select MAX25255AFDC/VY+T when functional safety certification is mandatory; MAX25254AFDC/VY+T suffices for general-purpose automotive power. |
| LM61480QRHFRQ1 | Single-channel 8A buck (vs. dual-channel); 3.5V–36V input; 15µA IQ; no multiphase support; Q1 automotive grade. | Requires two ICs to match dual-rail capability; lacks SYNCOUT/VEA for coordinated phase control. | Choose LM61480QRHFRQ1 only if single-rail design or board space allows duplication; MAX25254AFDC/VY+T integrates both rails in one package. |
Compared with MAX25255AFDC/VY+T, the MAX25254AFDC/VY+T omits redundant safety circuitry but retains identical power stage specs and multiphase capability - reducing cost and complexity where ASIL B is not mandated. Versus LM61480QRHFRQ1, it delivers true dual-channel integration with built-in phase synchronization, eliminating inter-IC timing skew and external coordination logic.
Availability
MAX25254AFDC/VY+T is available at Aetrix Electronics and suitable for automotive front-camera power, telematics module supply, and head-unit front-end power requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX25254AFDC/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 MAX25254/MAX25255 product line delivers compact, high-efficiency dual-buck solutions for automotive power systems demanding AEC-Q100 qualification, low IQ, and functional safety readiness - targeting ADAS, infotainment, and body electronics.
FAQ
What is the maximum output current per channel for MAX25254AFDC/VY+T?
The MAX25254AFDC/VY+T delivers up to 8A per channel continuously when operated at 400kHz switching frequency. At 2MHz, the rated output current is reduced to 6A due to thermal constraints. This rating assumes proper PCB layout with adequate copper pour, thermal vias under the exposed pad, and ambient temperature ≤+85°C. Derating is required above that temperature per the θJA = 27.2°C/W specification.
Does MAX25254AFDC/VY+T support adjustable output voltage?
Yes, the MAX25254AFDC/VY+T supports adjustable output voltage from 0.8V to 14V using external resistor dividers on FB1 and FB2 pins. In adjustable mode, the feedback voltage is regulated to 0.8V (typ), and the output is set via RTOP/RBOTTOM ratio. Fixed-output versions are also available, but MAX25254AFDC/VY+T is the adjustable variant - confirmed by its /VY+T suffix and datasheet Table 1 ordering information.
How does the multiphase operation work on MAX25254AFDC/VY+T?
The MAX25254AFDC/VY+T supports dual-phase operation internally (two channels 180° out-of-phase) and quad-phase operation externally by connecting two ICs. For quad-phase, SYNCOUT of the primary IC drives SYNC of the secondary, while VEA pins are tied together for current balancing. This configuration achieves up to 32A total output with ±10% current sharing accuracy - all without external controllers or complex timing circuitry.
Is MAX25254AFDC/VY+T qualified for automotive applications?
Yes, the MAX25254AFDC/VY+T is AEC-Q100 qualified (Grade 0: -40°C to +125°C ambient) and designed for automotive front-end power. It withstands 42V load-dump transients, operates down to 3V for cold-crank, and includes thermal shutdown, PGOOD monitoring, and short-circuit protection - meeting requirements for head units, cameras, and telematics modules.
What is the purpose of the EXTVCC pin on MAX25254AFDC/VY+T?
The EXTVCC pin on MAX25254AFDC/VY+T enables switchover of the internal 1.8V BIAS LDO supply from SUP1 to an external source (e.g., one of the buck outputs). When a valid voltage ≥2.5V is present, EXTVCC reduces power dissipation in the LDO and improves light-load efficiency. If EXTVCC drops below 2.4V (typ), the LDO automatically reverts to SUP1 - ensuring uninterrupted bias supply during transient events.
MAX25254AFDC/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 23-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 8A, 8A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25254AFDC/VY+T FAQ
1.How can I place an order for MAX25254AFDC/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25254AFDC/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 MAX25254AFDC/VY+T reliable?
The price and inventory of MAX25254AFDC/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 MAX25254AFDC/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25254AFDC/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25254AFDC/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25254AFDC/VY+T?
MAX25254AFDC/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25254AFDC/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 MAX25254AFDC/VY+T?
For technical support, including MAX25254AFDC/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25254AFDC/VY+T requirements.
6.How does Aetrix verify that MAX25254AFDC/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25254AFDC/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 MAX25254AFDC/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25254AFDC/VY+T?
All MAX25254AFDC/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25254AFDC/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 MAX25254AFDC/VY+T part is unused and in its original packaging.
Return procedure for MAX25254AFDC/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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