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Analog Devices Inc./Maxim Integrated MAX25255AFDB/VY+
- Part No.:
- MAX25255AFDB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25255AFDB/VY+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX25255AFDB/VY+ from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated high-side and low-side MOSFETs, delivering up to 8A per channel across 3V–36V input, featuring ASIL B functional safety compliance, 12µA no-load quiescent current, and 180° out-of-phase dual-phase operation for front-camera and telematics power supplies.
For engineers reviewing the MAX25255AFDB/VY+ datasheet, MAX25255AFDB/VY+ pinout, MAX25255AFDB/VY+ application, or MAX25255AFDB/VY+ equivalent, key selection considerations include its AEC-Q100 qualification, dual independent enable inputs (EN1/EN2), programmable PGOOD thresholds, EXTVCC switchover capability, and support for quad-phase parallel operation up to 32A.
Technical Context
The MAX25255AFDB/VY+ implements two independent buck regulators sharing a common 4.50mm × 5.75mm 23-pin FC2QFN package, each with internal 10.5mΩ high-side and 11mΩ low-side DMOS switches, 24ns minimum on-time, and MAXQ® power architecture enabling precision transient response and stable phase margin across 200kHz–2MHz switching frequencies.
It integrates redundant reference circuits, die temperature monitoring via TEMP pin (0.75V at +25°C), ±1% overvoltage/undervoltage protection accuracy, and active timeout logic for ASIL B diagnostic coverage - all operating within –40°C to +125°C ambient and supporting forced-PWM or skip-mode control via SYNC pin.
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 infotainment and ADAS modules. |
| Switching Frequency | 200kHz / 400kHz / 1MHz / 2MHz selectable; fixed-frequency PWM avoids AM band interference. |
| PGOOD Accuracy | ±1% threshold tolerance (MAX25255 variant); enables precise rail monitoring for ASIL B diagnostics. |
| Thermal Shutdown | 175°C junction activation with 15°C hysteresis; prevents latch-up during sustained overload. |
| Package | 23-pin FC2QFN (4.50mm × 5.75mm); optimized for high-power density and thermal dissipation (θJCb = 4.8°C/W). |
Pinout & Package
MAX25255AFDB/VY+ uses a 23-pin FC2QFN package (4.50mm × 5.75mm) with exposed thermal pad. Pin functions are validated per Analog Devices' official datasheet Rev 14 (2/26/2026), including dedicated EN1/EN2, BST1/BST2, LX1/LX2, PGOOD1/PGOOD2, and ASIL-specific TEMP and VEA pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | High-voltage tolerant (≥1.8V logic); allow separate sequencing of Buck1 and Buck2 for system-level power management. |
| BST1 / BST2 | Bootstrap supply for high-side gate drive | Require 0.1µF ceramic capacitor to respective LX pin; critical for reliable 100% duty-cycle dropout operation. |
| LX1 / LX2 | Switch node connections | Drive external inductors; high-impedance when corresponding channel disabled; support multiphase interleaving. |
| OUT1/FB1 / OUT2/FB2 | Fixed-output sense or adjustable feedback | Configurable for 0.8V–14V output via resistor divider; FB regulated to 0.8V (typ) in adjustable mode. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert low during startup, UV/OV fault, or thermal shutdown; support fail-safe system reset logic. |
| TEMP | Die temperature monitor output | Voltage proportional to junction temp (0.75V at +25°C); enables real-time thermal derating in FPWM mode. |
| VEA | Error amplifier output for multiphase | Used to tie primary/secondary ICs together in quad-phase configuration for balanced current sharing. |
| SYNC / SYNCOUT | Synchronization interface | SYNC selects FPWM/skip mode or accepts external clock; SYNCOUT provides 90°-phase-shifted clock for quad-phase timing. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL B Safety Compliance | Redundant reference, die-temp monitoring, and programmable OV/UV thresholds meet ISO 26262 requirements for front-camera and telematics subsystems. |
| Dual-Phase Interleaving | 180° phase shift between channels reduces input/output ripple and allows smaller filter components without sacrificing 16A total output. |
| EXTVCC Switchover | Switches BIAS LDO input from SUP1 to buck output voltage, lowering power dissipation and improving light-load efficiency. |
| Spread Spectrum EMI Reduction | ±6% frequency modulation centered at fSW (4.5kHz triangle wave) lowers peak EMI emissions without affecting regulation performance. |
| MAXQ® Power Architecture | Delivers >70° phase margin and <10µs transient recovery, enabling stable operation with minimal output capacitance in space-constrained ADAS designs. |
Applications
| Front-Camera Power Supply | Telematics Module Power |
|---|---|
Use Scenario: Powers image sensor, ISP, and communication ICs in automotive front-facing camera systems requiring clean, sequenced 1.8V/3.3V rails under wide-input voltage transients. IC Role / Device Role / Timing Role: Dual-buck controller providing independent, ASIL B–compliant 3.3V and 5.0V outputs with synchronized soft-start and PGOOD monitoring. Use Value: Enables single-chip solution replacing discrete DC-DC + supervisor ICs, reducing BOM count and PCB area by 35% while meeting ISO 26262 diagnostic coverage targets. | Use Scenario: Supplies LTE/V2X modems, GNSS receivers, and MCU cores in vehicle telematics control units exposed to battery voltage fluctuations and thermal stress. IC Role / Device Role / Timing Role: High-efficiency dual regulator with EXTVCC switchover and 12µA quiescent current supporting always-on connectivity and fast wake-up from sleep states. Use Value: Extends battery runtime during parking mode and maintains rail integrity during cold-crank (3.0V min), eliminating need for auxiliary LDOs or backup capacitors. |
| Head Unit Front-End Supply | ASIL B Diagnostic Power Subsystem |
Use Scenario: Delivers stable 5V and 12V rails to display drivers, audio amplifiers, and USB interfaces in automotive infotainment head units. IC Role / Device Role / Timing Role: Dual-channel buck converter with independent EN1/EN2 control enabling staggered power-up and fault-isolated shutdown sequences. Use Value: Reduces system-level power sequencing complexity and eliminates external supervisors, cutting design cycle time by ~2 weeks. | Use Scenario: Provides certified safe power to microcontrollers and sensor interfaces in ASIL B–rated domain controllers where failure could impair vehicle motion control. IC Role / Device Role / Timing Role: Safety-capable power IC with redundant voltage references, die-temp sensing, and programmable PGOOD thresholds for diagnostic coverage reporting. Use Value: Achieves >90% FMEDA coverage for power subsystem without external safety monitors, simplifying ISO 26262 FMEDA documentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25254AFDB/VY+ | No ASIL B features: lacks redundant reference, die-temp monitor, and programmable PGOOD thresholds; identical pinout and electrical specs otherwise. | Suitable for non-safety-critical dual-buck applications like body electronics or lighting control where functional safety is not required. | Select MAX25254AFDB/VY+ only if ASIL B compliance is unnecessary and cost optimization is prioritized. |
| LM61480QRNXTQ1 | Single-channel 8A buck; no dual output or multiphase capability; AEC-Q100 qualified but no ASIL B certification; different 16-pin QFN package. | Requires two ICs to match dual-rail capability; lacks integrated diagnostics and temperature monitoring needed for ASIL B subsystems. | Use LM61480QRNXTQ1 only for cost-sensitive, single-rail applications where multiphase operation and safety diagnostics are not required. |
Compared with MAX25254AFDB/VY+, the MAX25255AFDB/VY+ adds ASIL B–specific circuitry enabling diagnostic coverage for automotive safety goals, while LM61480QRNXTQ1 offers higher single-channel efficiency but requires duplication and external safety logic to approach equivalent functionality.
Availability
MAX25255AFDB/VY+ is available at Aetrix Electronics and suitable for automotive front-camera systems, telematics modules, and ASIL B–compliant head unit power supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX25255AFDB/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 precision power, sensing, and signal chain solutions.
The MAX25255AFDB/VY+ belongs to Analog Devices' MAX25254/MAX25255 automotive power management family, designed specifically for ASIL B–compliant dual-buck conversion in ADAS, infotainment, and telematics systems demanding high reliability, low quiescent current, and functional safety.
FAQ
What is the maximum output current supported by MAX25255AFDB/VY+ per channel?
The MAX25255AFDB/VY+ delivers up to 8A per channel continuously when operated at 400kHz switching frequency. At 2MHz, the maximum rated output current is reduced to 6A to maintain thermal limits within the 23-pin FC2QFN package. This derating ensures reliable operation across –40°C to +125°C ambient temperatures with proper PCB layout and thermal vias.
Does MAX25255AFDB/VY+ support quad-phase operation, and what is required to implement it?
Yes, MAX25255AFDB/VY+ supports quad-phase operation when paired with a second MAX25254D or MAX25255D device. Implementation requires connecting SYNCOUT of the primary IC to SYNC of the secondary, tying VEA pins together for current balancing, and routing PGOOD2 (primary) to PGOOD1 (secondary). FPWM mode must be used, and both ICs must share identical switching frequency settings.
How does the EXTVCC switchover function improve efficiency in MAX25255AFDB/VY+?
The EXTVCC switchover in MAX25255AFDB/VY+ reduces internal power dissipation by switching the BIAS LDO input from SUP1 to a regulated buck output (e.g., 3.3V or 5.0V) once soft-start completes. This lowers the LDO dropout voltage and associated I²R losses, improving light-load efficiency by up to 15% compared to SUP1-only operation - especially valuable in always-on telematics modules.
What safety certifications apply to MAX25255AFDB/VY+?
MAX25255AFDB/VY+ is AEC-Q100 qualified (Grade 1, –40°C to +125°C) and designed to meet ASIL B requirements per ISO 26262. It incorporates redundant voltage references, die temperature monitoring, programmable OV/UV thresholds with ±1% accuracy, and active timeout logic - all verified through Analog Devices' internal FMEDA process. No third-party ASIL B certification report is shipped with the part.
Can MAX25255AFDB/VY+ operate in dropout mode, and what is the minimum input-to-output voltage difference supported?
Yes, MAX25255AFDB/VY+ supports dropout operation with up to 99.6% maximum duty cycle, enabling regulation when input voltage approaches output voltage. For example, it can maintain 3.3V output with input as low as 3.35V - critical for automotive cold-crank scenarios. This capability is enabled by the MAXQ® architecture and robust gate-drive design, ensuring stable regulation without external assist circuitry.
MAX25255AFDB/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:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25255AFDB/VY+ FAQ
1.How can I place an order for MAX25255AFDB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25255AFDB/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 MAX25255AFDB/VY+ reliable?
The price and inventory of MAX25255AFDB/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25255AFDB/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25255AFDB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25255AFDB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25255AFDB/VY+?
MAX25255AFDB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25255AFDB/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 MAX25255AFDB/VY+?
For technical support, including MAX25255AFDB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25255AFDB/VY+ requirements.
6.How does Aetrix verify that MAX25255AFDB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25255AFDB/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 MAX25255AFDB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25255AFDB/VY+?
All MAX25255AFDB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25255AFDB/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 MAX25255AFDB/VY+ part is unused and in its original packaging.
Return procedure for MAX25255AFDB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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