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Analog Devices Inc./Maxim Integrated MAX25255AFDA/VY+
- Part No.:
- MAX25255AFDA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25255AFDA/VY+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:490
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Product details
Overview
MAX25255AFDA/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 output across 3V–36V input, featuring ASIL B functional safety compliance, 12µA no-load quiescent current, and 180° out-of-phase multiphase capability for front-camera and telematics power supplies.
For engineers reviewing the MAX25255AFDA/VY+ datasheet, MAX25255AFDA/VY+ pinout, MAX25255AFDA/VY+ application, or MAX25255AFDA/VY+ equivalent, this page delivers verified technical context, validated pin functions, confirmed ASIL B diagnostic features, real-world multiphase current-sharing accuracy (±10%), and precise thermal shutdown behavior (175°C with 15°C hysteresis) - all directly traceable to Analog Devices' official documentation.
Technical Context
The MAX25255AFDA/VY+ implements two independent synchronous buck regulators sharing a single 4.50mm × 5.75mm 23-pin FC2QFN package, each supporting PWM or skip-mode operation with selectable switching frequencies (200kHz/400kHz/1MHz/2MHz) and spread-spectrum EMI reduction (±6%). Its MAXQ® power architecture ensures precision transient response and stable phase margin under dynamic load steps.
ASIL B compliance is realized via redundant voltage reference, die temperature monitoring (TEMP pin), and programmable overvoltage/undervoltage protection with ±1% threshold accuracy and 35–65µs propagation delay. Dual-phase operation enables 16A output by paralleling both channels; quad-phase (with second IC) supports up to 32A with 90° inter-IC phase alignment via SYNCOUT→SYNC routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V absolute max); supports cold-crank and load-dump transients in automotive systems without external protection. |
| Output Current per Channel | Up to 8A at 400kHz; reduced to 6A at 2MHz - enables trade-off between component size and thermal performance. |
| Quiescent Current | 12µA (typ) with one channel active; critical for always-on automotive modules requiring ultra-low standby power. |
| Switching Frequency Options | 200kHz / 400kHz / 1MHz / 2MHz; fixed-frequency selection avoids AM band interference and simplifies EMI filter design. |
| ASIL B Diagnostics | Redundant reference, die temperature monitor (0.75V @ 25°C, 1.0V @ 125°C), and ±1% OV/UV threshold accuracy per channel. |
| Thermal Protection | Junction shutdown at 175°C with 15°C hysteresis; θJCb = 4.8°C/W on 4-layer board - enables robust thermal management in compact layouts. |
| Multiphase Support | Dual-phase (16A) and quad-phase (32A) configurations supported; ±10% current sharing accuracy verified across temperature and load. |
Pinout & Package
Package: 23-pin FC2QFN, 4.50mm × 5.75mm, exposed thermal pad (PGND1/PGND2 connected internally), RoHS-compliant (VY+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | High-voltage enable inputs | Direct battery connection (≥1.8V logic threshold); enable/disable Buck1/Buck2 independently for flexible power sequencing. |
| LX1 / LX2 | Switch-node outputs | Connect to external inductors; high-impedance when respective channel disabled - prevents shoot-through during partial shutdown. |
| BST1 / BST2 | Bootstrap supply terminals | Require 0.1µF ceramic capacitor to LXx; enable high-side gate drive above input rail - essential for 100% duty-cycle dropout operation. |
| OUT1/FB1 / OUT2/FB2 | Fixed-output sense or adjustable feedback inputs | Fixed version: connect OUTx to output; adjustable version: FBx referenced to 0.8V - supports 0.8V–14V programmable VOUT. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Pull low during startup, UV (90–97.5% nominal), or OV (102.5–110% nominal); ASIL B configurable thresholds with <65µs response. |
| TEMP | Die temperature monitor | Analog voltage output (VTMP = 2.6×TJ + 685 mV); enabled only in FPWM mode - provides real-time junction temp for thermal derating. |
| VEA | Error amplifier output | Used only in multiphase: tie VEA pins of primary/secondary ICs to balance current sharing and synchronize control loops. |
| SYNC / SYNCOUT | Phase synchronization I/O | SYNC: configure FPWM/skip mode or accept external clock; SYNCOUT: 90°-phase-shifted clock for quad-phase sync - no output in skip mode. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL B Functional Safety | Redundant reference, die temperature sensing, and programmable OV/UV protection with ±1% accuracy - certified for automotive safety-critical subsystems. |
| Ultra-Low Quiescent Current | 12µA (typ) with one channel active - extends battery life in always-on ADAS modules such as front cameras and radar sensors. |
| Multiphase Scalability | Single IC supports dual-phase (16A); two ICs support quad-phase (32A) with ±10% current sharing - eliminates need for external current-balancing circuitry. |
| Dropout Operation | 99% maximum duty cycle enables regulation down to VIN – VOUT ≈ 0.3V - critical for maintaining output during automotive cold-crank (5.5V min). |
| EMI Optimization | Spread-spectrum modulation (±6%) and selectable fixed frequencies avoid AM band; 24ns minimum on-time enables high VIN/VOUT ratios at 2MHz. |
Applications
| Front-Camera Power Supply | Telematics Control Unit (TCU) |
|---|---|
|
Use Scenario: Powering 5V/3.3V rails for image sensor, ISP, and communication interfaces in automotive front-facing camera modules. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated, low-noise, ASIL B-compliant power with PGOOD monitoring for system-level fault detection. Use Value: Enables single-chip solution replacing discrete DC-DC + safety monitor; 12µA IQ preserves battery during vehicle sleep mode. |
Use Scenario: Generating multiple regulated voltages (e.g., 5V for MCU, 3.3V for CAN transceivers, 1.8V for memory) in cellular-connected TCU platforms. IC Role / Device Role / Timing Role: Dual-channel PMIC with independent enable and PGOOD per rail - supports staggered power-up and fault-isolation across subsystems. Use Value: Reduces BOM count vs. two separate converters; 180° phase shift cuts input ripple by >50%, shrinking bulk capacitance requirements. |
| Head Unit Front-End Supply | ASIL B Domain Controller Power |
|
Use Scenario: Delivering high-current 5V/12V rails to infotainment head units with display backlight drivers and audio amplifiers. IC Role / Device Role / Timing Role: Primary buck converter handling peak loads (8A/channel); multiphase mode engages during GPU or DSP burst activity. Use Value: Dual-phase operation sustains 16A without thermal throttling; spread spectrum meets CISPR 25 Class 5 EMI limits. |
Use Scenario: Powering safety-critical domain controllers (e.g., ADAS central compute) requiring fault-tolerant voltage regulation and diagnostics. IC Role / Device Role / Timing Role: ASIL B-certified dual-buck with redundant reference, TEMP monitoring, and programmable OV/UV - feeds safety MCU and watchdog circuits. Use Value: Eliminates need for external safety monitors; diagnostic coverage includes die temperature, output quality, and internal reference integrity. |
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+ | 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 optimization outweighs functional safety requirements. | Select MAX25254AFDA/VY+ only if ASIL B compliance is not required - identical pinout and electrical specs otherwise. |
| TPS65321C-Q1 | Single 3A buck + LDO + watchdog; no dual 8A capability, no multiphase support, no spread spectrum, lower VIN max (28V). | Targeted at microcontroller power domains, not high-current front-end supplies; lacks PGOOD per channel and thermal monitoring. | Choose TPS65321C-Q1 only for low-power MCU-centric designs needing integrated watchdog - not a functional replacement for MAX25255AFDA/VY+. |
Compared with MAX25254AFDA/VY+, the MAX25255AFDA/VY+ adds full ASIL B diagnostic coverage without sacrificing efficiency or footprint; versus TPS65321C-Q1, it delivers 4× higher output current, dual independent regulation, and scalable multiphase architecture - making it uniquely suited for high-reliability automotive front-end power.
Availability
MAX25255AFDA/VY+ is available at Aetrix Electronics and suitable for automotive front-camera systems, telematics control units, and ASIL B domain controller power supplies requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 qualified performance.
Supply support for MAX25255AFDA/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 timing solutions.
The MAX25255AFDA/VY+ belongs to Analog Devices' MAX25254/MAX25255 automotive power management family, designed specifically for ASIL B-compliant, high-current DC-DC conversion in ADAS and infotainment systems operating across -40°C to +125°C ambient.
FAQ
What safety certifications does the MAX25255AFDA/VY+ hold?
The MAX25255AFDA/VY+ is AEC-Q100 qualified and designed to meet ASIL B functional safety requirements per ISO 26262. It incorporates redundant voltage reference, die temperature monitoring via the TEMP pin, and programmable overvoltage/undervoltage protection with ±1% threshold accuracy - all documented in the official Analog Devices datasheet Rev 14.
Can the MAX25255AFDA/VY+ operate in dropout mode, and what is its minimum input-to-output differential?
Yes, the MAX25255AFDA/VY+ supports dropout operation with up to 99.6% duty cycle, enabling regulation when input voltage approaches output voltage. At 3.3V output, it maintains regulation down to ~3.4V input - critical for automotive cold-crank conditions. This behavior is explicitly specified in the Electrical Characteristics table under "Maximum Duty Cycle."
How does multiphase operation work with the MAX25255AFDA/VY+, and what is the current-sharing accuracy?
The MAX25255AFDA/VY+ supports dual-phase operation internally (16A total) and quad-phase with a second IC (32A total). Phase alignment is achieved via SYNCOUT→SYNC routing, and current sharing is balanced using the VEA pin. The datasheet specifies ±10% current-sharing accuracy across temperature and load - verified under real multiphase test conditions.
What is the purpose of the EXTVCC pin on the MAX25255AFDA/VY+, and how does it affect efficiency?
The EXTVCC pin enables switchover of the internal 1.8V BIAS LDO supply from SUP1 to an external rail (e.g., buck output), reducing power dissipation and improving light-load efficiency. When VEXTVCC drops below ~2.4V, the LDO automatically reverts to SUP1. This feature is detailed in the "EXTVCC Switchover" section of the datasheet.
Does the MAX25255AFDA/VY+ support spread-spectrum frequency modulation, and how is it enabled?
Yes, the MAX25255AFDA/VY+ includes hardware-enabled spread-spectrum modulation (±6% around selected fSW) to reduce EMI peaks. It activates automatically when spread-spectrum is configured in the factory option code (VY+ suffix confirms this feature is enabled); no external components or register writes are needed - unlike external clock synchronization, which disables spread spectrum.
MAX25255AFDA/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:
- 6A, 6A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25255AFDA/VY+ FAQ
1.How can I place an order for MAX25255AFDA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25255AFDA/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 MAX25255AFDA/VY+ reliable?
The price and inventory of MAX25255AFDA/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX25255AFDA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25255AFDA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25255AFDA/VY+?
MAX25255AFDA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25255AFDA/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 MAX25255AFDA/VY+?
For technical support, including MAX25255AFDA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25255AFDA/VY+ requirements.
6.How does Aetrix verify that MAX25255AFDA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25255AFDA/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 MAX25255AFDA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25255AFDA/VY+?
All MAX25255AFDA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25255AFDA/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 MAX25255AFDA/VY+ part is unused and in its original packaging.
Return procedure for MAX25255AFDA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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