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Analog Devices Inc./Maxim Integrated MAX25255AFDA/VY+T
- Part No.:
- MAX25255AFDA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25255AFDA/VY+T.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,668
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Product details
Overview
MAX25255AFDA/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, ASIL B functional safety certification, and multiphase capability. It operates from 3V to 36V input, delivers up to 8A per channel (16A in dual-phase), features 12µA no-load quiescent current, and supports fixed or adjustable 0.8V–14V outputs - used in front-camera power supplies and telematics modules requiring robust voltage regulation under load-dump conditions.
For engineers reviewing the MAX25255AFDA/VY+T datasheet, MAX25255AFDA/VY+T pinout, MAX25255AFDA/VY+T application, or MAX25255AFDA/VY+T equivalent, this page provides verified technical context on its ASIL B diagnostics, MAXQ® power architecture, 23-pin FC2QFN package, dual-phase synchronization via SYNC/SYNCOUT, and thermal monitoring via TEMP pin - all critical for automotive power system design and safety-compliant layout.
Technical Context
The MAX25255AFDA/VY+T implements two independent synchronous buck regulators with integrated 10mΩ/6mΩ (HS/LS) DMOS switches, programmable switching frequencies (200kHz–2MHz), and forced-PWM/skip-mode control via SYNC pin. Its MAXQ® architecture delivers precision transient response and phase margin optimization without external compensation.
ASIL B compliance is achieved through redundant reference circuitry, die temperature monitoring (TEMP pin), ±1% overvoltage/undervoltage protection with four selectable thresholds (90–97.5% UV / 102.5–110% OV), and active timeout (6.0ms typ). Dual-phase operation uses 180° out-of-phase switching between channels, while quad-phase requires inter-IC SYNCOUT-to-SYNC connection and VEA node tying for current sharing within ±10% accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V max transient); supports automotive battery rails including cold-crank and load-dump events. |
| Output Current per Channel | Up to 8A continuous (at 400kHz); derates to 6A at 2MHz for thermal management in compact layouts. |
| Quiescent Current | 12µA (typ) with one channel enabled; enables always-on systems like ADAS cameras without battery drain. |
| Switching Frequency | 200kHz / 400kHz / 1MHz / 2MHz options; higher frequencies reduce inductor/capacitor size but trade off efficiency. |
| ASIL B Diagnostics | Redundant reference, precision OV/UV detection (±1% accuracy), die temperature monitor (TEMP), and 6ms active timeout. |
| Package | 23-pin FC2QFN (4.50mm × 5.75mm); optimized for thermal performance with separate PGND1/PGND2 and θJCb = 4.8°C/W. |
| Operating Temperature | -40°C to +125°C ambient; qualified to AEC-Q100 Grade 1 with junction limit of +150°C and thermal shutdown at +175°C. |
Pinout & Package
MAX25255AFDA/VY+T is housed in 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), with dedicated power grounds (PGND1/PGND2), dual enable inputs (EN1/EN2), and multiphase control pins (SYNC, SYNCOUT, VEA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | High-voltage enable inputs | Direct battery connection support (down to 1.8V logic threshold); independently control Buck1/Buck2 startup and shutdown. |
| BST1 / BST2 | Bootstrap supply for high-side gate drive | Require 0.1µF ceramic capacitor to LX1/LX2; enables efficient 100% duty-cycle operation in dropout mode. |
| LX1 / LX2 | Switch-node connections | Drive external inductors; high-impedance when respective channel disabled; support 10A RMS continuous current. |
| OUT1/FB1 / OUT2/FB2 | Fixed-output sense or adjustable feedback inputs | Fixed version: connect OUTx to output rail; adjustable version: use resistor divider to set 0.8V–14V with 0.8V reference. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert low during startup, UV/OV fault, or thermal shutdown; require external pull-up to BIAS or system rail. |
| SYNC / SYNCOUT | Multiphase synchronization interface | SYNC high = FPWM mode; SYNC low = skip mode; SYNCOUT provides 90°-phase-shifted clock for quad-phase stacking. |
| TEMP | Analog die temperature monitor | Outputs 0.75V at +25°C, 1.0V at +125°C (linear: VTEMP = 2.6×TJ + 685 mV); active only in FPWM mode. |
| VEA | Error amplifier output for current sharing | Tie VEA pins together across multiple ICs in quad-phase to balance load current within ±10% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL B Functional Safety | Redundant voltage reference, ±1% OV/UV detection, die temperature monitoring, and active timeout - certified for automotive safety-critical power rails. |
| Dual-Phase Capability | Two internal buck stages operate 180° out-of-phase to halve input/output ripple and double output current to 16A without external controllers. |
| MAXQ® Power Architecture | Eliminates need for external compensation components while delivering <10µs transient response and >60° phase margin across line/load variations. |
| Ultra-Low Quiescent Current | 12µA (typ) with one channel active enables >10-year battery life in always-on ADAS sensors and telematics ECUs. |
| Spread Spectrum EMI Reduction | ±6% frequency modulation centered at fSW (4.5kHz triangle wave at 2MHz) reduces peak radiated emissions by up to 10dB without affecting regulation. |
Applications
| Front-Camera Power Supply | Telematics Module Power |
|---|---|
Use Scenario: Powers image sensor, ISP, and communication ICs in automotive front-facing camera systems with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Primary dual-rail DC-DC regulator delivering 3.3V/5.0V simultaneously; manages load-dump transients and cold-crank dips. Use Value: ASIL B diagnostics ensure fail-safe shutdown during OV/UV events; 12µA quiescent current prevents battery drain during vehicle sleep mode. |
Use Scenario: Supplies processor, GNSS receiver, LTE modem, and CAN transceiver in vehicle telematics control units (TCUs). IC Role / Device Role / Timing Role: Dual-buck controller with independent EN1/EN2 enabling selective subsystem power gating and wake-up sequencing. Use Value: Dual-phase operation reduces input capacitance requirements by 50%; spread spectrum meets CISPR 25 Class 5 radiated emission limits. |
| Head Unit Front-End Supply | ASIL B-Certified Domain Controller Rail |
Use Scenario: Generates stable 5V/12V rails for infotainment head unit processors, display drivers, and audio amplifiers. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter supporting 36V input and 8A per rail under full thermal load. Use Value: 99% maximum duty cycle enables operation during battery brownout; PGOOD signals feed system supervisor for graceful shutdown. |
Use Scenario: Provides safety-monitored 3.3V/5.0V power to ASIL B domain controllers managing braking, steering, or ADAS fusion logic. IC Role / Device Role / Timing Role: Certified functional safety power IC with redundant OV/UV comparators and die temperature reporting via TEMP pin. Use Value: Enables ISO 26262-compliant power architecture without external safety monitors; reduces BOM count and validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25254AFDA/VY+T | No ASIL B diagnostics; lacks redundant reference, die temperature monitor, and programmable OV/UV thresholds. | Suitable for non-safety-critical dual-buck applications (e.g., body electronics) where cost is prioritized over functional safety. | Select MAX25254AFDA/VY+T only if ASIL B compliance is not required; identical pinout and electrical specs otherwise. |
| LM61480QRNXTQ1 | Single-channel 8A buck; no dual-phase or ASIL B support; lower IQ (15µA vs 12µA) and no spread spectrum. | Requires two devices for dual-rail designs; lacks integrated multiphase sync and safety diagnostics needed for centralized ADAS power. | Choose LM61480QRNXTQ1 for simpler single-rail systems or when board space allows discrete dual implementation. |
Compared with MAX25254AFDA/VY+T and LM61480QRNXTQ1, the MAX25255AFDA/VY+T uniquely integrates ASIL B safety, dual-phase synchronization, and ultra-low IQ in a single 23-pin FC2QFN - reducing system-level complexity, PCB area, and functional safety validation burden for automotive domain controllers.
Availability
MAX25255AFDA/VY+T is available at Aetrix Electronics and suitable for front-camera power supplies, telematics modules, and ASIL B domain controller rails requiring stable component supply, long-term automotive lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for MAX25255AFDA/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 safety-certified, AEC-Q100-qualified solutions.
The MAX25255AFDA/VY+T belongs to Analog Devices' MAX25254/MAX25255 family of automotive power management ICs, designed specifically for ASIL B-compliant dual-buck conversion in ADAS, infotainment, and telematics systems demanding high reliability and low quiescent current.
FAQ
What is the maximum output current capability of the MAX25255AFDA/VY+T in dual-phase configuration?
The MAX25255AFDA/VY+T supports up to 16A total output current in dual-phase mode by operating its two internal buck converters 180° out-of-phase. This configuration halves input/output ripple current and improves thermal distribution across the 23-pin FC2QFN package, enabling higher power density than discrete dual-buck solutions. Each channel delivers 8A at 400kHz or 6A at 2MHz, with current sharing accuracy maintained within ±10% via VEA node coupling.
Does the MAX25255AFDA/VY+T require external compensation components?
No, the MAX25255AFDA/VY+T does not require external compensation components due to its integrated MAXQ® power architecture. This proprietary control loop design delivers stable operation with >60° phase margin and <10µs transient response across all line, load, and temperature conditions - eliminating the need for external RC networks or type-II/type-III compensators typically required in conventional buck controllers.
How does the ASIL B safety certification manifest in the MAX25255AFDA/VY+T's hardware features?
The MAX25255AFDA/VY+T achieves ASIL B compliance through redundant voltage reference circuitry, precision ±1% overvoltage/undervoltage comparators with four selectable thresholds, die temperature monitoring via the TEMP pin (0.75V at +25°C), and an active timeout circuit with 6.0ms typical duration. These features are implemented in hardware and independently verified - enabling safe shutdown during fault conditions without reliance on software or external monitors.
Can the MAX25255AFDA/VY+T operate with only one buck channel enabled?
Yes, the MAX25255AFDA/VY+T supports independent channel control via EN1 and EN2 pins. Either buck converter can be disabled while the other remains active, maintaining 12µA typical quiescent current. When only one channel operates, the unused LX pin becomes high-impedance, and its associated PGOOD signal remains inactive - allowing flexible power sequencing and subsystem-level power gating in multi-rail automotive ECUs.
What is the purpose of the EXTVCC pin on the MAX25255AFDA/VY+T?
The EXTVCC pin on the MAX25255AFDA/VY+T enables switchover of the internal 1.8V BIAS LDO supply from SUP1 to an external source (e.g., a buck output rail), reducing power dissipation and improving light-load efficiency. When EXTVCC voltage exceeds 2.50V (typ), the LDO input automatically switches; if EXTVCC drops below 2.41V (typ), it reverts to SUP1 - ensuring seamless operation during transient load conditions without manual intervention.
MAX25255AFDA/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:
- 6A, 6A
- 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)
MAX25255AFDA/VY+T FAQ
1.How can I place an order for MAX25255AFDA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25255AFDA/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 MAX25255AFDA/VY+T reliable?
The price and inventory of MAX25255AFDA/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 MAX25255AFDA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25255AFDA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25255AFDA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25255AFDA/VY+T?
MAX25255AFDA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25255AFDA/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 MAX25255AFDA/VY+T?
For technical support, including MAX25255AFDA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25255AFDA/VY+T requirements.
6.How does Aetrix verify that MAX25255AFDA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25255AFDA/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 MAX25255AFDA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25255AFDA/VY+T?
All MAX25255AFDA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25255AFDA/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 MAX25255AFDA/VY+T part is unused and in its original packaging.
Return procedure for MAX25255AFDA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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