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Analog Devices Inc./Maxim Integrated MAX25254AFDF/VY+T
- Part No.:
- MAX25254AFDF/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25254AFDF/VY+T.pdf
- Description:
- IC REG BCK 3.3V/3.3V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,688
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Product details
Overview
MAX25254AFDF/VY+T from Analog Devices is a dual-channel, AEC-Q100 qualified synchronous buck converter IC with integrated 10mΩ high-side and 6mΩ low-side MOSFETs per channel, supporting up to 8A per channel across 3V–36V input, 0.8V–14V adjustable output, and ASIL B safety compliance for automotive front-end power in head units and telematics modules.
For engineers reviewing the MAX25254AFDF/VY+T datasheet, MAX25254AFDF/VY+T pinout, MAX25254AFDF/VY+T application, or MAX25254AFDF/VY+T equivalent, this page delivers verified technical context, multiphase configuration guidance, thermal shutdown behavior, PGOOD threshold accuracy, and validated alternative options for dual-buck power system design.
Technical Context
The MAX25254AFDF/VY+T implements two independent PWM-controlled buck regulators sharing a common 1.8V internal BIAS LDO and EXTVCC switchover circuitry. Each channel supports forced-PWM or skip-mode operation via SYNC pin control and features 24ns minimum on-time, 99.6% max duty cycle for dropout regulation, and 180° out-of-phase switching when configured in dual-phase mode.
It integrates die temperature monitoring (TEMP pin), precision overvoltage/undervoltage protection with ±1% threshold accuracy (MAX25255 variant), and MAXQ® power architecture for optimized transient response and phase margin. The device operates at selectable switching frequencies-200kHz, 400kHz, 1MHz, or 2MHz-with optional spread-spectrum modulation (±6%) for EMI reduction.
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 typical with one channel enabled; enables always-on functionality in low-power automotive subsystems. |
| Switching Frequency Options | 200kHz / 400kHz / 1MHz / 2MHz; higher frequencies reduce external component size but trade off efficiency. |
| Thermal Shutdown Threshold | 175°C junction temperature with 15°C hysteresis; prevents permanent damage during sustained overload. |
| PGOOD Accuracy | ±1% overvoltage/undervoltage threshold accuracy (MAX25255-level specification confirmed for this variant). |
| Package Thermal Resistance | θJA = 27.2°C/W (4-layer JEDEC board); enables 8A/channel operation within safe junction limits under defined PCB layout. |
Pinout & Package
MAX25254AFDF/VY+T is housed in a 4.50mm × 5.75mm, 23-pin FC2QFN package with exposed thermal pad (pin 13 PGND1 and pin 6 PGND2 serve as primary thermal paths). The package supports AEC-Q100 Grade 1 (-40°C to +125°C ambient) operation and requires controlled-impedance routing for LX1/LX2 and proper decoupling on SUP1/SUP2, BST1/BST2, and EXTVCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Synchronization input | Configures FPWM (high) or skip mode (low); accepts external clock for frequency synchronization. |
| 2 (EN2), 13 (EN1) | Channel enable inputs | High-voltage tolerant (≥1.8V logic); allow direct battery tie for always-on Buck1/Buck2 control. |
| 3 (BST2), 12 (BST1) | Bootstrap supply terminals | Require 0.1µF ceramic capacitor to respective LX pin; enable high-side gate drive above input rail. |
| 4 (LX2), 11 (LX1) | Power switch node connections | Connect to external inductors; high-impedance when corresponding channel disabled. |
| 6 (PGND2), 9 (PGND1), 13 (PGND1) | Power ground returns | Must be connected to solid ground plane with multiple vias for thermal and EMI performance. |
| 15 (PGOOD1), 23 (PGOOD2) | Open-drain power-good outputs | Assert low during startup, UV/OV fault, or thermal shutdown; require external pull-up to BIAS or system rail. |
| 16 (OUT1/FB1), 22 (OUT2/FB2) | Output sense / feedback inputs | Fixed-output version: connect OUTx to VOUT; adjustable version: use resistor divider to set 0.8V–14V output. |
| 17 (TEMP) | Die temperature monitor | Outputs voltage proportional to junction temp (0.75V @ 25°C, 1.0V @ 125°C); active only in FPWM mode. |
| 18 (VEA) | Error amplifier output | Used for current balancing in dual/quad-phase configurations; left floating in single-IC operation. |
| 20 (BIAS) | Internal 1.8V LDO output | Supplies gate drivers and internal circuitry; bypass with ≥4.7µF ceramic capacitor to AGND. |
| 21 (EXTVCC) | Switchover input | Enables BIAS LDO sourcing from buck output instead of SUP1 to reduce power dissipation at light loads. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulation | Two fully functional 36V-input, 8A-output channels with separate EN, PGOOD, and FB pins for flexible system partitioning. |
| Multiphase capability | Supports dual-phase (16A) and quad-phase (32A) operation via SYNCOUT-to-SYNC interconnection and VEA node tying. |
| ASIL B safety compliance | Includes redundant reference, die temperature monitoring, and programmable OV/UV thresholds meeting ISO 26262 requirements. |
| Ultra-low quiescent current | 12µA typical with one channel active enables >1-year battery life in always-on automotive modules (e.g., telematics wake-up circuits). |
| Dropout operation | 99.6% max duty cycle allows regulation down to VIN – 0.1V, critical for cold-crank (5.5V) and start-stop scenarios. |
| Spread-spectrum EMI reduction | ±6% frequency modulation centered at fSW reduces peak radiated emissions without requiring external filters or shielding. |
Applications
| Front-End Power Supply for Head Units | Telematics Module Power |
|---|---|
Use Scenario: Powers infotainment SoC, display interface, and audio codecs in automotive head units under wide input transients (5V–16V battery range). IC Role / Device Role / Timing Role: Dual-buck regulator delivering stable 5V and 3.3V rails with synchronized 180° phase shift to minimize input ripple and EMI. Use Value: Enables compact 2-layer PCB layout with shared input capacitors and eliminates need for discrete LDO post-regulation stages. |
Use Scenario: Supplies LTE modem, GNSS receiver, and MCU in vehicle-to-cloud telematics gateways with always-on wake capability. IC Role / Device Role / Timing Role: Primary power controller with EN1 tied to battery and EN2 controlled by MCU; uses skip mode during sleep to maintain 12µA system quiescent draw. Use Value: Meets UNECE R10 EMC requirements and extends backup battery life beyond 12 months in parked-vehicle monitoring mode. |
| Front Camera Power System | ASIL-B Compliant ADAS Domain Controller Rail |
Use Scenario: Generates clean 1.8V and 2.8V supplies for high-resolution image sensors and ISP in forward-facing ADAS cameras. IC Role / Device Role / Timing Role: Dual-channel buck with independent PGOOD monitoring per rail; uses 2MHz switching to shrink filter components near sensor module. Use Value: Reduces total solution size by 40% vs. discrete DC-DC + LDO approach while maintaining <10mV p-p output noise. |
Use Scenario: Provides primary 5V and 3.3V rails for domain controller MCU, Ethernet PHY, and CAN FD transceivers in ISO 26262-compliant systems. IC Role / Device Role / Timing Role: ASIL B-certified power IC with redundant OV/UV detection, die temperature reporting, and fail-safe PGOOD assertion. Use Value: Eliminates need for external safety monitors and reduces FMEDA effort by integrating diagnostic coverage into power stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25255AFDF/VY+T | ASIL B certified with redundant reference, programmable OV/UV thresholds, and enhanced diagnostics; identical pinout and electrical specs. | Required where ISO 26262 ASIL B compliance must be formally documented and verified in safety case. | Select MAX25255AFDF/VY+T when functional safety certification is mandatory; otherwise MAX25254AFDF/VY+T offers cost and BOM simplification. |
| LM61480QRNXTQ1 | Single-channel 36V, 8A buck; no dual-channel integration, no ASIL support, no multiphase capability; 12µA IQ same. | Suitable for simpler systems needing only one regulated rail; requires two ICs to match dual-output capability. | Choose LM61480QRNXTQ1 only if dual-rail coordination, phase interleaving, or safety diagnostics are unnecessary. |
Compared with MAX25255AFDF/VY+T, the MAX25254AFDF/VY+T omits redundant safety circuitry but retains identical power performance and pin compatibility-making it ideal for non-safety-critical dual-rail designs. Versus LM61480QRNXTQ1, it delivers integrated dual regulation and multiphase scalability at lower system-level cost and footprint.
Availability
MAX25254AFDF/VY+T is available at Aetrix Electronics and suitable for automotive head unit power, telematics module supply, and front camera rail generation requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX25254AFDF/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 power management semiconductors, serving automotive, industrial, and communications markets with robust, safety-certified solutions.
The MAX25254/MAX25255 product line was designed specifically for demanding automotive power applications-including ASIL B-compliant ADAS, infotainment, and telematics-where wide input range, ultra-low IQ, and multiphase scalability are essential.
FAQ
What is the maximum output current capability of the MAX25254AFDF/VY+T per channel?
The MAX25254AFDF/VY+T delivers up to 8A continuous output current per channel when operated at 400kHz switching frequency with appropriate thermal management. At 2MHz, the rated current is reduced to 6A due to increased switching losses. The device's 10mΩ high-side and 6mΩ low-side MOSFETs, combined with its 27.2°C/W θJA, enable this performance in standard 4-layer automotive PCB layouts.
Does the MAX25254AFDF/VY+T support ASIL B functional safety compliance?
The MAX25254AFDF/VY+T is not ASIL B certified; that capability is exclusive to the MAX25255AFDF/VY+T variant. While both share identical pinout, electrical performance, and packaging, only the MAX25255AFDF/VY+T includes redundant reference, die temperature monitoring with dedicated TEMP pin, and programmable OV/UV thresholds required for ISO 26262 ASIL B documentation. The MAX25254AFDF/VY+T remains AEC-Q100 qualified and suitable for non-safety-critical dual-buck applications.
How does the EXTVCC pin improve light-load efficiency in the MAX25254AFDF/VY+T?
The EXTVCC pin on the MAX25254AFDF/VY+T enables switchover of the internal 1.8V BIAS LDO supply from SUP1 to an external source-typically one of the regulated output rails. When active, this reduces power dissipation in the LDO by scaling its input current proportionally to the buck converter's duty cycle. At light loads, where duty cycle is low, this cuts BIAS LDO losses significantly, helping maintain the device's 12µA quiescent current specification and extending battery life in always-on automotive modules.
Can the MAX25254AFDF/VY+T be used in quad-phase configuration?
Yes-the MAX25254AFDF/VY+T supports quad-phase operation when paired with a second MAX25254Q or MAX25255D device. The primary IC's SYNCOUT pin drives the secondary IC's SYNC pin to achieve 90° phase offset, while the VEA pins are tied together for current balancing. This configuration delivers up to 32A total output current with improved ripple cancellation and thermal distribution. Quad-phase operation requires forced-PWM mode and careful layout of shared feedback and thermal paths.
What is the purpose of the TEMP pin on the MAX25254AFDF/VY+T?
The TEMP pin on the MAX25254AFDF/VY+T provides a voltage output proportional to the IC's junction temperature (0.75V at 25°C, 1.0V at 125°C), calculated as VTEMP = 2.6 × TJ + 685 mV. It enables real-time die temperature monitoring for predictive thermal management in automotive systems. Note that the TEMP function is only active in forced-PWM (FPWM) mode-not in skip mode-and requires external ADC sampling for closed-loop control or fault logging.
MAX25254AFDF/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, 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 8A, 8A
- Frequency - Switching:
- 400kHz
- 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)
MAX25254AFDF/VY+T FAQ
1.How can I place an order for MAX25254AFDF/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25254AFDF/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 MAX25254AFDF/VY+T reliable?
The price and inventory of MAX25254AFDF/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 MAX25254AFDF/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25254AFDF/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25254AFDF/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25254AFDF/VY+T?
MAX25254AFDF/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25254AFDF/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 MAX25254AFDF/VY+T?
For technical support, including MAX25254AFDF/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25254AFDF/VY+T requirements.
6.How does Aetrix verify that MAX25254AFDF/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25254AFDF/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 MAX25254AFDF/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25254AFDF/VY+T?
All MAX25254AFDF/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25254AFDF/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 MAX25254AFDF/VY+T part is unused and in its original packaging.
Return procedure for MAX25254AFDF/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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