My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX25255DAFDG/VY+T
- Part No.:
- MAX25255DAFDG/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25255DAFDG/VY+T.pdf
- Description:
- IC REG BUCK 5V/5V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX25255DAFDG/VY+T from Analog Devices is a dual-channel, AEC-Q100 qualified synchronous buck converter IC with ASIL B functional safety compliance. It delivers up to 8A per channel from 3V–36V input, features 12µA no-load quiescent current, 180° out-of-phase operation, and supports dual-phase (16A) or quad-phase (32A) configurations for automotive front-end power supplies and telematics modules.
For engineers reviewing the MAX25255DAFDG/VY+T datasheet, MAX25255DAFDG/VY+T pinout, MAX25255DAFDG/VY+T application, or MAX25255DAFDG/VY+T equivalent, this page provides verified technical context, multiphase configuration guidance, ASIL B diagnostic architecture, thermal monitoring via TEMP pin, and validated alternative options for high-current automotive DC-DC designs.
Technical Context
The MAX25255DAFDG/VY+T implements two independent synchronous buck regulators with integrated 10mΩ/6mΩ high-side/low-side MOSFETs, MAXQ® power architecture for precision transient response, and programmable overvoltage/undervoltage thresholds (±1% accuracy) for ASIL B compliance. It supports forced-PWM or skip mode via SYNC pin and enables external clock synchronization up to 2.5MHz.
Dual-phase operation uses internal 180° phase shift between channels, while quad-phase requires SYNCOUT-to-SYNC interconnection between primary and secondary ICs and VEA node tying for current balancing. Die temperature sensing (TEMP pin), redundant reference, and active timeout (6.0ms typ) are exclusive to the MAX25255 variant and enabled only in FPWM mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V absolute max); supports automotive battery transients including load dump. |
| Output Current per Channel | Up to 8A continuous at 400kHz; derated to 6A at 2MHz for thermal management. |
| Quiescent Current | 12µA (typ) with one channel enabled; enables always-on systems without battery drain. |
| Switching Frequency | 200kHz / 400kHz / 1MHz / 2MHz selectable; fixed-frequency PWM avoids AM band interference. |
| ASIL B Compliance | Validated for ISO 26262; includes redundant voltage reference, die temp monitor, and ±1% OV/UV threshold accuracy. |
| Thermal Protection | Thermal shutdown at 175°C with 15°C hysteresis; junction-to-board θJB = 7.9°C/W on 4-layer EV kit. |
| Package | 23-pin FC2QFN (4.50mm × 5.75mm); exposed thermal pad for enhanced heat dissipation in automotive environments. |
Pinout & Package
MAX25255DAFDG/VY+T is housed in a 23-pin FC2QFN package (4.50mm × 5.75mm) with exposed thermal pad. Pin layout supports dual-buck operation, multiphase synchronization, and ASIL B diagnostics including dedicated TEMP, VEA, and redundant PGOOD outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | High-voltage compatible (≥1.8V logic); allow individual channel control for sequencing or fault isolation. |
| LX1 / LX2 | Power switch node connections | Connect to external inductors; high-impedance when respective channel disabled. |
| BST1 / BST2 | Bootstrap supply pins | Require 0.1µF ceramic capacitor to LXx; enable high-side gate drive above input rail. |
| OUT1/FB1 / OUT2/FB2 | Fixed output or feedback inputs | Fixed version: connect OUTx to output; adjustable version: FBx accepts resistor divider for 0.8V–14V programming. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert low during startup, UV/OV faults, or thermal shutdown; support ASIL B diagnostics with programmable thresholds. |
| TEMP | Die temperature monitor | Analog voltage output (0.75V @ 25°C, 1.0V @ 125°C); enables real-time thermal margining in FPWM mode. |
| VEA | Error amplifier output | Used only in multiphase: tie VEA pins of primary/secondary ICs to balance current sharing in dual/quad-phase setups. |
| SYNC / SYNCOUT | Synchronization interface | SYNC: configure FPWM/skip mode or accept external clock; SYNCOUT: 90° out-of-phase clock for quad-phase timing alignment. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL B Safety Architecture | Redundant reference, die temperature monitor, ±1% OV/UV threshold accuracy, and 6.0ms active timeout meet ISO 26262 requirements. |
| Multiphase Scalability | Single IC supports dual-phase (16A); two ICs enable quad-phase (32A) with <±10% current sharing accuracy and VEA-based loop sharing. |
| Ultra-Low Quiescent Current | 12µA (typ) with one channel active enables >10-year battery life in always-on automotive modules like telematics or cameras. |
| Wide Input Range & Dropout Operation | Operates down to 3V input and sustains regulation at 99% duty cycle-critical for cold-crank and stop-start automotive conditions. |
| Spread Spectrum EMI Reduction | ±6% frequency modulation centered at fSW reduces peak EMI by >10dB; disabled only when externally synchronized. |
Applications
| Front-End Power Supply for Head Units | ASIL B-Critical Telematics Modules |
|---|---|
Use Scenario: Powers infotainment SoC, display, and audio subsystems from 12V battery with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated 5V/3.3V rails with 180° phase shift to reduce input ripple and inductor size. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep; ASIL B diagnostics ensure safe shutdown during rail faults. |
Use Scenario: Supplies V2X communication controller, GNSS receiver, and cellular modem in ADAS telematics gateway. IC Role / Device Role / Timing Role: Primary IC in quad-phase configuration delivering 32A total with redundant OV/UV monitoring per channel. Use Value: Programmable PGOOD thresholds (90–97.5% UV, 102.5–110% OV) enable precise fault detection aligned with ASIL B FMEDA requirements. |
| Front Camera Power System | Industrial Vision Sensor Hub |
Use Scenario: Powers high-resolution automotive camera module requiring clean, stable 1.8V/2.8V rails with minimal noise coupling. IC Role / Device Role / Timing Role: Adjustable-output buck converter using external resistor dividers and feed-forward capacitors for optimized loop stability. Use Value: 24ns minimum on-time enables high VIN/VOUT ratios (e.g., 12V→1.8V at 2MHz), reducing solution footprint by 40% vs. legacy controllers. |
Use Scenario: Delivers regulated power to multi-sensor industrial vision system operating in extended temperature (-40°C to +125°C ambient). IC Role / Device Role / Timing Role: Dual-phase configuration with thermal monitoring via TEMP pin to prevent derating under sustained 16A load. Use Value: Junction-to-board θJB = 7.9°C/W ensures ≤50°C temperature rise at full load on standard 4-layer PCB-eliminating need for heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25254DAFDG/VY+T | No ASIL B features: lacks redundant reference, die temp monitor, and programmable OV/UV thresholds; identical pinout and electrical specs otherwise. | Suitable for non-safety-critical dual-buck applications (e.g., general-purpose industrial power) where AEC-Q100 suffices but ISO 26262 is not required. | Select MAX25254DAFDG/VY+T when ASIL B diagnostics are unnecessary and cost optimization is prioritized. |
| LM61480QRNXTQ1 | Single-channel 8A buck; no multiphase capability, no ASIL B certification, no TEMP/VEA/SYNCOUT pins; 3.3V–36V input, 12µA IQ. | Applicable only for single-rail systems; cannot scale beyond 8A or support dual/quad-phase topologies. | Choose LM61480QRNXTQ1 only for space-constrained single-output designs where multiphase and safety diagnostics are irrelevant. |
Compared with MAX25255DAFDG/VY+T, MAX25254DAFDG/VY+T removes ASIL B functionality while retaining identical packaging and core regulation performance, whereas LM61480QRNXTQ1 offers lower integration for single-rail use but forfeits scalability, safety compliance, and thermal monitoring-making MAX25255DAFDG/VY+T the sole option for certified dual-phase automotive power delivery.
Availability
MAX25255DAFDG/VY+T is available at Aetrix Electronics and suitable for automotive head unit power supplies, ASIL B telematics modules, front camera systems, and industrial vision sensor hubs requiring stable component supply across extended temperature and safety-critical environments.
Supply support for MAX25255DAFDG/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 digital signal processing technologies, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and conversion solutions.
The MAX25255DAFDG/VY+T belongs to Analog Devices' MAX25254/MAX25255 family-designed specifically for AEC-Q100-compliant, ASIL B automotive power systems requiring dual-buck regulation, multiphase scalability, and robust diagnostics in harsh environments.
FAQ
What safety certifications does the MAX25255DAFDG/VY+T hold?
The MAX25255DAFDG/VY+T is AEC-Q100 qualified and ASIL B compliant per ISO 26262, featuring redundant voltage reference, die temperature monitoring via TEMP pin, ±1% overvoltage/undervoltage threshold accuracy, and 6.0ms active timeout. These capabilities are validated in the MAX25255DAFDG/VY+T datasheet and supported by Analog Devices' functional safety documentation package for the MAX25255DAFDG/VY+T.
Can the MAX25255DAFDG/VY+T operate in dropout mode?
Yes, the MAX25255DAFDG/VY+T supports dropout operation by running at up to 99.6% duty cycle, enabling regulation even when input voltage approaches output voltage-critical for automotive cold-crank (e.g., 6V input regulating 5V output). This behavior is confirmed in the Electrical Characteristics table of the MAX25255DAFDG/VY+T datasheet under "Maximum Duty Cycle".
How is multiphase operation implemented with the MAX25255DAFDG/VY+T?
Multiphase operation with the MAX25255DAFDG/VY+T uses internal 180° phase shift for dual-phase (16A) within one IC, or SYNCOUT-to-SYNC interconnection plus VEA node tying between two ICs for quad-phase (32A). The MAX25255DAFDG/VY+T datasheet specifies that FPWM mode is required, and current sharing accuracy is ±10%-verified in Functional Diagrams and Applications Information sections.
What is the role of the TEMP pin on the MAX25255DAFDG/VY+T?
The TEMP pin on the MAX25255DAFDG/VY+T provides an analog voltage proportional to die temperature (0.75V @ 25°C, 1.0V @ 125°C), enabling real-time thermal margining. It operates only in forced-PWM mode and is part of the ASIL B diagnostic suite. The linear relationship VTEMP = 2.6 × TJ + 685 mV is specified in the MAX25255DAFDG/VY+T datasheet's Detailed Description section.
Does the MAX25255DAFDG/VY+T support spread spectrum operation?
Yes, the MAX25255DAFDG/VY+T supports spread spectrum with ±6% frequency modulation centered at the selected switching frequency (200kHz–2MHz), reducing peak EMI by >10dB. Spread spectrum is enabled by default and automatically disabled only when an external clock is applied to the SYNC pin-confirmed in the MAX25255DAFDG/VY+T datasheet's Spread-Spectrum Option section.
MAX25255DAFDG/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):
- 5V, 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)
MAX25255DAFDG/VY+T FAQ
1.How can I place an order for MAX25255DAFDG/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25255DAFDG/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 MAX25255DAFDG/VY+T reliable?
The price and inventory of MAX25255DAFDG/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 MAX25255DAFDG/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25255DAFDG/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25255DAFDG/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25255DAFDG/VY+T?
MAX25255DAFDG/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25255DAFDG/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 MAX25255DAFDG/VY+T?
For technical support, including MAX25255DAFDG/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25255DAFDG/VY+T requirements.
6.How does Aetrix verify that MAX25255DAFDG/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25255DAFDG/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 MAX25255DAFDG/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25255DAFDG/VY+T?
All MAX25255DAFDG/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25255DAFDG/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 MAX25255DAFDG/VY+T part is unused and in its original packaging.
Return procedure for MAX25255DAFDG/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX25255DAFDG/VY+T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
