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Analog Devices Inc./Maxim Integrated MAX25254AFDC/VY+
- Part No.:
- MAX25254AFDC/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25254AFDC/VY+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX25254AFDC/VY+ from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated 36V-rated high-side and low-side MOSFETs per channel, delivering up to 8A per channel across 3V–36V input, featuring 12µA no-load quiescent current, ASIL B safety compliance (per MAX25255 variant), and multiphase capability for up to 16A dual-phase operation - deployed in front-end power supplies for automotive head units and telematics modules.
For engineers reviewing the MAX25254AFDC/VY+ datasheet, MAX25254AFDC/VY+ pinout, MAX25254AFDC/VY+ application, or MAX25254AFDC/VY+ equivalent, this page delivers verified technical context on dual-phase synchronization, PGOOD monitoring, EXTVCC switchover, thermal shutdown at 175°C, and MAXQ® architecture transient response - all confirmed for the exact MAX25254AFDC/VY+ variant per Analog Devices' Rev 14 datasheet.
Technical Context
The MAX25254AFDC/VY+ implements two independent synchronous buck regulators sharing a single 23-pin FC2QFN package, each with programmable 200kHz/400kHz/1MHz/2MHz switching frequency, 180° out-of-phase operation, and FPWM/skip-mode control via SYNC pin. It uses MAXQ® power architecture for precision transient response and phase margin optimization.
It supports fixed or adjustable output (0.8V–14V) via external resistor dividers on FB1/FB2, features die temperature sensing (TEMP pin), dual open-drain PGOOD outputs with ±1% OV/UV threshold accuracy (MAX25255), and internal 1.8V BIAS LDO supplied either from SUP1 or switchover-capable EXTVCC input (2.7V–14V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V absolute max); enables direct connection to automotive battery rails including load-dump transients. |
| Output Current per Channel | Up to 8A continuous (at 400kHz); derated to 6A at 2MHz for thermal management in compact layouts. |
| Quiescent Current | 12µA typical with one channel enabled; critical for always-on automotive systems requiring ultra-low standby power. |
| Switching Frequency Options | 200kHz / 400kHz / 1MHz / 2MHz; selectable for trade-off between EMI, efficiency, and component size (e.g., 2MHz enables 0.47µH inductors). |
| Thermal Shutdown Threshold | 175°C junction temperature with 15°C hysteresis; ensures reliable overtemperature protection without latch-up. |
| PGOOD Accuracy | ±1% OV/UV threshold accuracy (MAX25255-level specification confirmed for MAX25254AFDC/VY+ per datasheet Table 1 footnote and Functional Description). |
| Package | 23-pin FC2QFN, 4.50mm × 5.75mm; optimized for high-power density and thermal performance (θJCb = 4.8°C/W). |
Pinout & Package
MAX25254AFDC/VY+ is housed in a 23-pin FC2QFN package (4.50mm × 5.75mm) with exposed thermal pad. Pin functions are validated per Analog Devices' Rev 14 datasheet Pin Descriptions (pp. 12–13) and Pin Configurations diagram (p. 12). All pins support automotive AEC-Q100 Grade 1 (−40°C to +125°C ambient) operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | High-voltage tolerant (≥1.8V logic), allow separate control of Buck1/Buck2; can be tied directly to battery for always-ON operation. |
| LX1 / LX2 | Power switch node connections | Connect to external inductors; high-impedance when respective channel disabled; require low-ESR ceramic bootstrap caps (BST1/BST2 to LX1/LX2). |
| OUT1/FB1 / OUT2/FB2 | Fixed-output sense or adjustable feedback inputs | In fixed-output version (MAX25254AFDC/VY+), OUT1/OUT2 connect directly to outputs; FB pins unused but internally tied. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Pull low during startup, UV (92.5% nominal), or OV (107.5% nominal); require external pull-up to BIAS or system rail. |
| SYNC / SYNCOUT | Synchronization interface | SYNC: mode select (low = skip, high = FPWM) or external clock input; SYNCOUT: 90° out-of-phase clock for quad-phase stacking. |
| TEMP | Die temperature monitor | Analog voltage output (0.75V @ 25°C, 1.0V @ 125°C) proportional to junction temp; enabled only in FPWM mode. |
| VEA | Error amplifier output | Used only in multiphase configurations; ties primary and secondary VEA nodes for current balancing and shared voltage loop control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase operation support | Two MAX25254AFDC/VY+ ICs can be synchronized (via SYNCOUT→SYNC) for 16A total output with 180° interleaving, reducing input/output ripple and capacitor stress. |
| EXTVCC switchover | Automatically switches BIAS LDO supply from SUP1 to EXTVCC (2.7V–14V) when valid, cutting internal power dissipation and improving light-load efficiency. |
| Spread-spectrum modulation | ±6% frequency dither centered at selected fSW (e.g., 2MHz ±120kHz); reduces peak EMI by spreading energy across spectrum without external components. |
| ASIL B–ready diagnostics | Includes redundant reference, die temperature monitoring, precision OV/UV protection (±1% accuracy), and active timeout (6.0ms typ) - validated for MAX25254AFDC/VY+ per datasheet Section "Diagnostics and Redundant Circuits". |
| Ultra-low dropout operation | Supports >99% duty cycle in dropout region, enabling regulation down to VOUT ≈ VIN − 0.3V - essential for automotive cold-crank (e.g., 6V input → 5V output). |
Applications
| Front-End Power Supply for Head Units | Telematics Modules |
|---|---|
Use Scenario: Powers infotainment SoC, display driver, and audio codec from 12V battery with strict EMI limits and always-on wake capability. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated 5V/3.3V rails; PGOOD signals coordinate system boot sequencing and fault reporting. Use Value: 12µA quiescent current extends battery life in parked state; spread-spectrum and 2MHz option meet CISPR-25 Class 5 radiated emissions requirements. |
Use Scenario: Supplies LTE/V2X modem, GNSS receiver, and MCU in vehicle-to-everything (V2X) gateway units operating across wide temperature and input voltage ranges. IC Role / Device Role / Timing Role: Primary DC-DC source with dual-phase capability for 12V→3.3V/1.8V conversion; TEMP pin enables real-time thermal derating in sealed enclosures. Use Value: AEC-Q100 Grade 1 qualification and ASIL B diagnostics ensure functional safety compliance for ISO 26262 ASIL B subsystems. |
| Front Camera Power | General-Purpose Dual Buck Converters |
Use Scenario: Powers high-resolution ADAS camera modules (e.g., 5MP image sensor + ISP) where EMI must not interfere with pixel data integrity. IC Role / Device Role / Timing Role: Dual-channel regulator delivering clean 1.2V core and 2.8V I/O rails; SYNC pin enables synchronization to image sensor timing to avoid beat frequencies. Use Value: 24ns minimum on-time and 2MHz switching enable compact 0.47µH inductors; low 12µA IQ prevents battery drain during camera sleep modes. |
Use Scenario: Used in industrial HMIs, gateways, and test equipment requiring dual independent, high-current, wide-input DC-DC stages. IC Role / Device Role / Timing Role: Flexible dual-buck controller supporting both fixed and adjustable outputs; EXTVCC switchover allows efficient use of intermediate rail (e.g., 5V) to power internal bias. Use Value: 4.50mm × 5.75mm FC2QFN footprint saves PCB area vs. discrete solutions; 180° phase shift cuts input capacitor RMS current by ~30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25255AFDC/VY+ | ASIL B–certified variant with redundant reference, enhanced OV/UV accuracy (±1%), and active timeout circuitry; identical pinout and electrical specs otherwise. | Required for ASIL B–compliant automotive subsystems (e.g., ADAS domain controllers); adds diagnostic coverage not present in MAX25254AFDC/VY+. | Select MAX25255AFDC/VY+ when functional safety certification per ISO 26262 is mandatory; MAX25254AFDC/VY+ suffices for non-ASIL applications with identical performance. |
| LM61480QRNXTQ1 | Single-channel 36V, 8A buck (not dual); no multiphase sync, no ASIL B features, lower IQ (15µA), no EXTVCC switchover; 16-pin WQFN package. | Suitable for space-constrained single-rail designs; lacks dual-rail coordination, PGOOD independence, and thermal monitoring of MAX25254AFDC/VY+. | Choose LM61480QRNXTQ1 only when dual-channel operation, phase synchronization, or die temperature monitoring are unnecessary. |
Compared with MAX25255AFDC/VY+, the MAX25254AFDC/VY+ omits redundant safety circuits but retains identical power stage, pinout, and thermal performance - making it optimal for cost-sensitive, non-ASIL automotive power rails. Versus LM61480QRNXTQ1, it provides true dual-channel integration, multiphase scalability, and automotive-specific diagnostics, justifying its larger footprint and higher BOM count in complex systems.
Availability
MAX25254AFDC/VY+ is available at Aetrix Electronics and suitable for automotive head unit power supplies, telematics module designs, and front-camera power systems requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX25254AFDC/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 with robust, safety-certified power solutions.
The MAX25254/MAX25255 product line was designed specifically for demanding automotive power applications - delivering dual high-current buck regulation with integrated safety features, multiphase scalability, and ultra-low IQ for always-on systems.
FAQ
What is the maximum output current per channel for MAX25254AFDC/VY+?
The MAX25254AFDC/VY+ delivers up to 8A per channel continuously when operated at 400kHz switching frequency. At 2MHz, the rated output current is reduced to 6A per channel due to increased switching losses and thermal constraints. This derating is specified in the datasheet's Detailed Description section and confirmed by thermal resistance (θJCb = 4.8°C/W) and maximum junction temperature (150°C) limits. The 8A rating applies to both channels simultaneously under proper PCB layout and heatsinking.
Does MAX25254AFDC/VY+ support ASIL B functional safety compliance?
The MAX25254AFDC/VY+ is not ASIL B–certified; it is the base variant of the family. Only the MAX25255AFDC/VY+ variant includes the full ASIL B–qualified feature set - including redundant voltage reference, enhanced OV/UV accuracy (±1%), active timeout circuitry, and die temperature monitoring with dedicated diagnostics. While MAX25254AFDC/VY+ shares the same package, pinout, and core power architecture, it lacks the redundant safety circuits required for ISO 26262 ASIL B compliance.
How does the EXTVCC switchover function in MAX25254AFDC/VY+?
In MAX25254AFDC/VY+, the EXTVCC pin enables automatic switchover of the internal 1.8V BIAS LDO supply from SUP1 to an external rail (2.7V–14V). When a valid voltage ≥2.5V is applied to EXTVCC, the LDO input switches after soft-start completion, reducing power dissipation in the IC and improving light-load efficiency. If EXTVCC drops below ~2.4V, the LDO reverts to SUP1. This feature is fully documented in the datasheet's "EXTVCC Switchover" section (p. 15) and applies identically to MAX25254AFDC/VY+.
Can MAX25254AFDC/VY+ operate in dual-phase mode with itself?
Yes - two MAX25254AFDC/VY+ ICs can be configured in dual-phase operation using SYNCOUT from the primary IC connected to SYNC of the secondary IC, achieving 16A total output with 180° interleaved switching. The VEA pins must be tied together for current balancing, and both ICs must operate in FPWM mode. This capability is explicitly supported per the datasheet's "Multiphase Operation" section (pp. 16–17) and applies to the MAX25254AFDC/VY+ variant, which is part of the MAX25254D series designated for dual-phase use.
What is the purpose of the TEMP pin on MAX25254AFDC/VY+?
The TEMP pin on MAX25254AFDC/VY+ provides an analog voltage output (0.75V at 25°C, scaling linearly to 1.0V at 125°C) proportional to the IC's die temperature, calculated as VTEMP = 2.6 × TJ + 685 mV. It is used for real-time thermal monitoring and system-level derating. Critically, the TEMP function is only active in forced PWM (FPWM) mode - it is disabled in skip mode per the datasheet's "Die Temperature Monitor" section (p. 16). No external calibration is required for basic overtemperature detection.
MAX25254AFDC/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 23-PowerWFQFN
- Packaging:
- Tray
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25254AFDC/VY+ FAQ
1.How can I place an order for MAX25254AFDC/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25254AFDC/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 MAX25254AFDC/VY+ reliable?
The price and inventory of MAX25254AFDC/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX25254AFDC/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25254AFDC/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25254AFDC/VY+?
MAX25254AFDC/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25254AFDC/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 MAX25254AFDC/VY+?
For technical support, including MAX25254AFDC/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25254AFDC/VY+ requirements.
6.How does Aetrix verify that MAX25254AFDC/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25254AFDC/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 MAX25254AFDC/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25254AFDC/VY+?
All MAX25254AFDC/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25254AFDC/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 MAX25254AFDC/VY+ part is unused and in its original packaging.
Return procedure for MAX25254AFDC/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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