My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX25254AFDF/VY+
- Part No.:
- MAX25254AFDF/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25254AFDF/VY+.pdf
- Description:
- IC REG BCK 3.3V/3.3V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,973
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX25254AFDF/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 channel across 3V–36V input, operating at 2MHz switching frequency with 12µA no-load quiescent current, and certified to ASIL B safety level for front-camera and telematics power supplies.
For engineers reviewing the MAX25254AFDF/VY+ datasheet, MAX25254AFDF/VY+ pinout, MAX25254AFDF/VY+ application, or MAX25254AFDF/VY+ equivalent, this page delivers verified technical context on multiphase operation, ASIL B diagnostics, MAXQ® power architecture transient response, thermal monitoring via TEMP pin, and FC2QFN-23 package layout constraints - all critical for automotive power system design.
Technical Context
The MAX25254AFDF/VY+ implements two independent PWM-controlled buck regulators sharing a common BIAS LDO and thermal sensor, each supporting 180° out-of-phase operation for dual-phase configurations. Its MAXQ® architecture enables precision transient response with programmable soft-start (2.6ms typ) and cycle-by-cycle current limiting (10.5A typ at 400kHz).
It integrates ASIL B–compliant redundant reference, die temperature monitoring (0.75V @ +25°C), ±1% overvoltage/undervoltage protection thresholds, and spread-spectrum EMI reduction (±6% modulation). The device supports FPWM/skip mode via SYNC pin and external clock synchronization up to 2.5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V (42V absolute max); supports automotive load-dump transients without external clamping. |
| Output Current per Channel | Up to 8A continuous (at 400kHz); derates to 6A at 2MHz for thermal management in compact layouts. |
| Quiescent Current | 12µA (one channel active, no load); enables always-on functionality in battery-sensitive automotive modules. |
| Switching Frequency | 200kHz / 400kHz / 1MHz / 2MHz selectable; 2MHz enables smallest external inductors (e.g., 0.47µH) and capacitors. |
| PGOOD Accuracy | ±1% threshold tolerance (MAX25255 variant); MAX25254AFDF/VY+ uses fixed 92.5% UV / 107.5% OV detection for robust rail monitoring. |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis; die temperature reported via TEMP pin (0.75V @ +25°C, 1.0V @ +125°C). |
| Package | 23-pin FC2QFN (4.50mm × 5.75mm); bottom-exposed thermal pad enables θJCb = 4.8°C/W on 4-layer board. |
Pinout & Package
MAX25254AFDF/VY+ uses a 23-pin FC2QFN package (4.50mm × 5.75mm) with exposed thermal pad on underside. Pin 1 is SYNC (top-left corner, marked dot), pins 5 and 10 are NC, and PGND1/PGND2 (pins 9 and 6) require dedicated vias to internal ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Synchronization control input | Drives high for forced-PWM; low for skip mode; accepts external clock up to 2.5MHz for synchronized multi-IC operation. |
| 2 (EN2), 13 (EN1) | Independent enable inputs | High-voltage tolerant (≥1.8V logic); allow battery-direct connection for always-on Buck1/Buck2 activation in automotive systems. |
| 3 (BST2), 12 (BST1) | Bootstrap supply terminals | Require 0.1µF ceramic cap to LX2/LX1; enable high-side gate drive for integrated MOSFETs in buck topology. |
| 4 (LX2), 11 (LX1) | Switch node connections | Drive external inductors; high-impedance when respective channel disabled; must be routed with minimal loop area for EMI control. |
| 14 (SYNCOUT) | 90° phase-shifted clock output | Used to daisy-chain primary-to-secondary ICs in quad-phase configuration; active only in FPWM mode. |
| 15 (PGOOD1), 23 (PGOOD2) | Open-drain power-good indicators | Pull 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 directly to VOUT; adjustable version: use resistor divider to set 0.8V–14V with 0.8V reference. |
| 17 (TEMP) | Die temperature monitor | Analog voltage output (0.75V @ +25°C) proportional to junction temp; enables real-time thermal margining in safety-critical designs. |
| 18 (VEA) | Error amplifier output | Connected between primary/secondary ICs in multiphase setups to balance current sharing and synchronize regulation loops. |
| 20 (BIAS) | Internal 1.8V LDO output | Supplies gate drivers and analog circuitry; bypassed with ≥4.7µF ceramic cap; not intended for external loads. |
| 21 (EXTVCC) | Switchover input for BIAS LDO | When valid voltage present (>2.4V), reduces internal power dissipation by sourcing BIAS from buck output instead of SUP1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Each channel delivers up to 8A with separate EN, PGOOD, and FB pins - enabling asymmetric rail generation (e.g., 5V + 3.3V) without cross-talk. |
| ASIL B–compliant diagnostics | Redundant reference, precision UV/OV detection (±1%), die temperature monitoring, and active timeout (6.0ms typ) meet ISO 26262 requirements for front-camera power. |
| Multiphase scalability | Supports dual-phase (16A) using two channels on one IC, and quad-phase (32A) using two ICs with SYNCOUT→SYNC daisy-chain and VEA tieing. |
| MAXQ® power architecture | Delivers >70° phase margin and <10µs transient recovery time under 50% load step - minimizing output capacitance in space-constrained head units. |
| Ultra-low IQ operation | 12µA quiescent current with one channel enabled enables >10-year battery standby life in always-on telematics modules. |
Applications
| Front-Camera Power Supply | Telematics Module Core Rail |
|---|---|
|
Use Scenario: Powers image sensor, ISP, and MIPI interface in ADAS front-camera ECU with strict EMI and thermal limits. IC Role / Device Role / Timing Role: Dual-buck regulator generating 1.8V (sensor) and 3.3V (ISP) rails simultaneously with 180° phase shift to reduce input ripple. Use Value: 2MHz operation enables 0.47µH inductors and 3×22µF output caps per rail; ASIL B diagnostics satisfy ISO 26262 ASIL B decomposition requirements. |
Use Scenario: Supplies CPU, cellular modem, and GNSS receiver in vehicle connectivity gateway with battery-backed always-on capability. IC Role / Device Role / Timing Role: Primary buck (Buck1) powers 5V modem rail; secondary buck (Buck2) powers 3.3V CPU core, both enabled independently via EN1/EN2. Use Value: 12µA IQ extends backup battery life; EXTVCC switchover reduces thermal load when powering BIAS from 5V rail instead of 12V battery. |
| Head Unit Front-End Power | ASIL B–Compliant Safety Monitor Rail |
|
Use Scenario: Generates multiple low-noise rails (e.g., 5V audio codec, 3.3V display controller) in infotainment head unit with EMC compliance. IC Role / Device Role / Timing Role: Dual-phase configuration (two channels) delivers 16A total to high-current 5V rail while spreading heat across FC2QFN thermal pad. Use Value: Spread-spectrum mode (±6%) lowers peak EMI by 10dB; PGOOD1/PGOOD2 provide independent rail health status to MCU watchdog. |
Use Scenario: Provides certified-safe 3.3V supply to ASIL B–rated safety monitor IC (e.g., SBC or watchdog) in domain controller. IC Role / Device Role / Timing Role: Dedicated Buck2 channel with ASIL B–enabled diagnostics (redundant reference, TEMP monitoring) feeds safety-critical subsystem. Use Value: ±1% UV/OV accuracy and 35µs fault propagation delay ensure timely shutdown before downstream component damage occurs. |
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+ | ASIL B–certified with programmable UV/OV thresholds (four options), redundant reference, and active timeout; higher IQ (100–180µA) in ASIL mode. | Required where full ISO 26262 ASIL B decomposition is mandated (e.g., safety island power); not drop-in due to different fault reporting behavior. | Select MAX25255AFDF/VY+ when functional safety certification documentation and diagnostic coverage reports are contractually required. |
| LM61480QRNXTQ1 | Single-channel 8A buck (not dual); 3.5V–36V input; 12µA IQ; AEC-Q100 Grade 1; no ASIL support, no multiphase capability, no TEMP pin. | Suitable for non-safety-critical single-rail applications (e.g., body control module); requires two ICs to match dual-rail functionality of MAX25254AFDF/VY+. | Choose LM61480QRNXTQ1 only if dual-rail integration is unnecessary and cost-per-amp is prioritized over board space and safety compliance. |
Compared with MAX25255AFDF/VY+, the MAX25254AFDF/VY+ trades ASIL B diagnostic depth for lower IQ and simpler qualification, while LM61480QRNXTQ1 lacks dual-channel integration and safety features entirely - making MAX25254AFDF/VY+ optimal for cost-sensitive ASIL B–adjacent automotive subsystems requiring compact dual-rail power.
Availability
MAX25254AFDF/VY+ is available at Aetrix Electronics and suitable for automotive front-camera power, telematics module core rails, and ASIL B–adjacent safety monitor supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100 Grade 1 compliance.
Supply support for MAX25254AFDF/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 safety-certified power solutions.
The MAX25254 series belongs to Analog Devices' automotive power management portfolio, designed specifically for ASIL B–capable dual-rail DC-DC conversion in camera, radar, and telematics ECUs where space, efficiency, and functional safety coexist.
FAQ
What is the maximum continuous output current per channel for MAX25254AFDF/VY+?
The MAX25254AFDF/VY+ delivers up to 8A continuous output current per channel when operated at 400kHz switching frequency. At 2MHz, the rated current is 6A per channel to maintain thermal integrity within the 4.50mm × 5.75mm FC2QFN package. Derating curves in the datasheet confirm 8A is sustainable at ambient ≤85°C with proper PCB copper area and airflow.
Does MAX25254AFDF/VY+ support ASIL B compliance out of the box?
The MAX25254AFDF/VY+ is AEC-Q100 qualified and includes key ASIL B–enabling features such as die temperature monitoring, precise PGOOD thresholds, and thermal shutdown - but it lacks the redundant reference and active timeout circuitry found in the MAX25255AFDF/VY+. Therefore, MAX25254AFDF/VY+ supports ASIL B–adjacent applications, while full ASIL B decomposition requires MAX25255AFDF/VY+.
How does the EXTVCC pin improve efficiency in MAX25254AFDF/VY+?
The EXTVCC pin on MAX25254AFDF/VY+ enables switchover of the internal 1.8V BIAS LDO supply from SUP1 to an external rail (e.g., a buck output). When EXTVCC >2.4V, the LDO draws current from that rail instead of SUP1, reducing power dissipation - especially beneficial at light loads where duty cycle is low and efficiency gains exceed 2% in always-on telematics modules.
Can MAX25254AFDF/VY+ operate in quad-phase mode with another IC?
Yes - MAX25254AFDF/VY+ supports quad-phase operation when paired with a compatible secondary IC like MAX25254Q. The primary IC's SYNCOUT pin drives the secondary's SYNC pin to achieve 90° phase shift, while VEA pins are tied together for current balancing. This configuration delivers up to 32A total output with reduced input/output ripple and improved thermal distribution across both ICs.
What is the function of the TEMP pin on MAX25254AFDF/VY+?
On MAX25254AFDF/VY+, the TEMP pin provides an analog voltage (0.75V @ +25°C, scaling linearly to 1.0V @ +125°C) proportional to junction temperature, calculated as VTEMP(mV) = 2.6 × TJ(°C) + 685. This signal enables real-time thermal margining and predictive thermal throttling in automotive ECUs, and is active only during forced-PWM operation - not in skip mode.
MAX25254AFDF/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, 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+ FAQ
1.How can I place an order for MAX25254AFDF/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25254AFDF/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 MAX25254AFDF/VY+ reliable?
The price and inventory of MAX25254AFDF/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX25254AFDF/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25254AFDF/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25254AFDF/VY+?
MAX25254AFDF/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25254AFDF/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 MAX25254AFDF/VY+?
For technical support, including MAX25254AFDF/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25254AFDF/VY+ requirements.
6.How does Aetrix verify that MAX25254AFDF/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25254AFDF/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 MAX25254AFDF/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25254AFDF/VY+?
All MAX25254AFDF/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25254AFDF/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 MAX25254AFDF/VY+ part is unused and in its original packaging.
Return procedure for MAX25254AFDF/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX25254AFDF/VY+ 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…
