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Analog Devices Inc./Maxim Integrated MAX25263AFOC/VY+T
- Part No.:
- MAX25263AFOC/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX25263AFOC/VY+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
MAX25263AFOC/VY+T from Analog Devices is an AEC-Q100 qualified automotive synchronous buck converter with integrated 3.4A high-side and 4.75A low-side MOSFETs, 3.5V–65V input range, 2.1MHz/400kHz selectable switching frequency, and 3.5μA no-load quiescent current-designed for double-battery automotive power rails in instrument clusters and head units.
For engineers reviewing the MAX25263AFOC/VY+T datasheet, MAX25263AFOC/VY+T pinout, MAX25263AFOC/VY+T application, or MAX25263AFOC/VY+T equivalent, key selection considerations include its 98% max duty cycle for cold-crank operation, pin-selectable spread spectrum (±6%), PGOOD monitoring, EXTVCC switchover capability, and FCQFN-17 3.5mm × 3.75mm EMI-optimized package.
Technical Context
The MAX25263AFOC/VY+T implements current-mode control with internal slope compensation and a 20ns minimum on-time to support skip-free 24VIN-to-3.3V conversion at 2.1MHz. Its phase-locked loop (PLL) enables external clock synchronization across 250kHz–2.6MHz, while cycle-by-cycle overcurrent protection and hiccup-mode recovery safeguard against short circuits.
Thermal shutdown activates at +170°C with 15°C hysteresis, and undervoltage lockout (UVLO) on the BIAS rail ensures startup only above 3.1V (rising) and prevents operation below 2.65V (falling). The device supports both forced PWM and skip-mode operation via the SYNC pin, with frequency foldback to 262.5kHz when VIN drops near VOUT under 2.1MHz operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 65V - supports automotive double-battery transients and cold-crank down to 3.5V |
| Output Current | 3A continuous - validated for 3.4A min current limit and thermal performance up to +125°C ambient |
| Quiescent Current | 3.5μA typical at no load - enables always-on systems without excessive battery drain |
| Switching Frequency | 2.1MHz or 400kHz fixed - 2.1MHz minimizes inductor/capacitor size; 400kHz maximizes efficiency |
| Min On-Time | 20ns typical - enables single-stage 24VIN→3.3V conversion without pulse-skipping at 2.1MHz |
| Duty Cycle Max | 98% - sustains regulation during low-VIN automotive undervoltage events (e.g., cranking) |
| PGOOD Accuracy | ±2% window (93–97% rising, 91.5–95.5% falling) - provides precise output voltage monitoring for sequencing |
| AEC-Q100 Grade | Grade -40°C to +125°C - qualified for under-hood and infotainment module deployment |
Pinout & Package
MAX25263AFOC/VY+T uses a 3.5mm × 3.75mm, 17-pin FCQFN package with exposed pad (EP), symmetrical SUP/PGND layout, and EMI-optimized pin assignment including dedicated BST, EXTVCC, SPS, and SYNC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGOOD) | Open-drain power-good indicator | Signals regulation status with 93–97% UVLO and 103.5–110% OV thresholds; requires external pull-up |
| 2 (EN) | Active-high enable input | VIN-tolerant (up to +70V); enables converter only when BIAS > 3.1V and EN > 1.8V |
| 3,9 (SUP) | Main power input for high-side FET and internal LDO | Each requires 2.2µF + 0.1µF ceramic bypass; symmetric placement reduces EMI |
| 5,7 (PGND) | Power ground return | Must be connected together and tied to EP; separates power and analog ground paths |
| 6 (LX) | Switch node | Connects directly to inductor; high di/dt path requiring minimal loop area and no vias |
| 10 (BST) | Bootstrap capacitor connection | 0.1µF ceramic between BST and LX supplies gate drive for high-side FET |
| 11 (GND) | Analog ground reference | Separate from PGND; connects to FB, SYNC, SPS, and EXTVCC reference points |
| 12 (BIAS) | Internal 5V LDO output | Bypassed with ≥2.2µF ceramic; powers internal circuitry unless EXTVCC is active |
| 13 (FB) | Feedback input | Connect to BIAS for fixed 3.3V/5V/12V outputs; connect resistor divider for 1V–20V adjustment |
| 14 (EXTVCC) | External bias supply input | 3.25V–5.5V input bypasses internal LDO, reducing power dissipation and improving light-load efficiency |
| 15 (OUT) | Output voltage sense point | Used with internal divider when FB = BIAS; required for accurate regulation of fixed-output variants |
| 16 (SYNC) | Frequency synchronization input | Pull low for skip mode; drive with external clock or BIAS for forced PWM; PLL locks to 250kHz–2.6MHz |
| 17 (SPS) | Spread-spectrum enable | Pull high to enable ±6% triangular modulation at 4.5kHz (2.1MHz) or 0.8kHz (400kHz) |
| EP | Exposed thermal pad | Must be soldered to input supply plane (same as SUP pins) for thermal conduction and EMI shielding |
Key Features
| Feature | Design Value |
|---|---|
| EMI-optimized flip-chip FCQFN | Symmetrical SUP/PGND pins and exposed pad reduce radiated emissions without added filters |
| Pin-selectable spread spectrum | ±6% frequency dithering lowers peak EMI amplitude by spreading energy across bandwidth |
| 98% max duty cycle | Maintains regulation during automotive cold-crank (e.g., 5.5V input → 3.3V output) |
| 20ns minimum on-time | Enables direct 24VIN-to-3.3V conversion at 2.1MHz without pulse skipping or instability |
| EXTVCC switchover | Reduces internal power loss by disabling 5V LDO when external 3.25–5.5V supply is applied |
| AEC-Q100 Grade 1 | Qualified for automotive applications from –40°C to +125°C junction temperature |
Applications
| Automotive Instrument Cluster | Navigation Head Unit |
|---|---|
Use Scenario: Powering microcontroller, display driver, and CAN transceiver in digital dashboard with 12V/24V dual-battery compatibility. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering 3A continuous current with PGOOD sequencing and cold-crank support. Use Value: 3.5μA quiescent current extends battery life in parked state; 98% duty cycle maintains display operation during engine start. | Use Scenario: Supplying SoC, touchscreen controller, and audio codec in infotainment system with AM/FM radio co-location. IC Role / Device Role / Timing Role: EMI-hardened buck converter operating in forced PWM mode with spread spectrum enabled to avoid AM band interference. Use Value: 2.1MHz switching + ±6% spread spectrum reduces 2.1MHz harmonics below CISPR 25 Class 5 limits without filter redesign. |
| Double-Battery Automotive System | Distributed DC Power Architecture |
Use Scenario: Regulating 48V auxiliary battery down to 12V for ADAS camera modules and radar processors. IC Role / Device Role / Timing Role: High-input buck stage converting 3.5V–65V to stable 12V with 3A output and thermal fault recovery. Use Value: Cycle-by-cycle current limiting and hiccup-mode protection prevent latch-up during short-circuit events in safety-critical zones. | Use Scenario: Local point-of-load regulation for FPGA I/O banks and DDR memory in modular vehicle ECUs. IC Role / Device Role / Timing Role: Compact 3.5mm × 3.75mm buck providing 1V–20V programmable output with soft-start ramp control. Use Value: External resistor-divider feedback enables precise 1.2V/1.8V/2.5V outputs matching ASIC voltage requirements without custom ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25262AFOC/VY+T | 2A version with identical pinout, package, and feature set; lower current limit (2.6A min) and higher RDS(on) (108mΩ HS / 56mΩ LS) | Preferred where 2A output suffices and board space/layout reuse is critical | Select MAX25262AFOC/VY+T for cost-sensitive 2A designs with identical footprint and qualification |
| LM61480QRNXTQ1 | 3.5A rated, 4.2V–36V input, 2.1MHz fixed, no spread spectrum, different pinout (16-pin WQFN), no EXTVCC switchover | Used in non-EMI-critical 12V systems where 65V input range and AEC-Q100 Grade 1 are not required | Choose LM61480QRNXTQ1 only if input stays ≤36V and EMI mitigation relies on external filtering |
Compared with MAX25262AFOC/VY+T, the MAX25263AFOC/VY+T delivers 50% higher output current and lower RDS(on), while LM61480QRNXTQ1 lacks spread spectrum and 65V tolerance-making MAX25263AFOC/VY+T the sole option meeting full automotive double-battery, EMI, and thermal requirements in one package.
Availability
MAX25263AFOC/VY+T is available at Aetrix Electronics and suitable for automotive instrument clusters, navigation head units, and distributed DC power systems requiring stable component supply across extended temperature and long-lifecycle production programs.
Supply support for MAX25263AFOC/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 semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX25263AFOC/VY+T belongs to the MAX25262/MAX25263 family of automotive-grade mini buck converters, designed specifically for high-reliability, low-EMI power conversion in space-constrained vehicle subsystems.
FAQ
What is the maximum input voltage supported by the MAX25263AFOC/VY+T?
The MAX25263AFOC/VY+T supports a maximum input voltage of 65V, verified per Absolute Maximum Ratings. This enables operation across automotive double-battery systems (12V/24V/48V) and withstands load-dump transients up to +65V without damage or regulation loss. Operation above 65V violates absolute maximum limits and may cause permanent failure.
Does the MAX25263AFOC/VY+T support adjustable output voltage?
Yes, the MAX25263AFOC/VY+T supports adjustable output voltage from 1V to 20V using an external resistor divider connected between OUT, FB, and GND. When FB is tied to BIAS, it defaults to factory-programmed fixed outputs (3.3V, 5V, or 12V depending on variant). The MAX25263AFOC/VY+T datasheet specifies VFB = 1.0V (typ) for divider calculations.
How does the EXTVCC pin function on the MAX25263AFOC/VY+T?
The EXTVCC pin on the MAX25263AFOC/VY+T accepts 3.25V–5.5V to bypass the internal 5V BIAS LDO. When valid, it disables the LDO and powers internal circuitry directly, reducing power dissipation and improving light-load efficiency. If EXTVCC falls below ~3.09V, the LDO re-enables automatically. Connecting 5V to EXTVCC is recommended for optimal FET RDS(on) and efficiency.
Is the MAX25263AFOC/VY+T pin-compatible with the MAX25262AFOC/VY+T?
Yes, the MAX25263AFOC/VY+T is pin-compatible and package-compatible with the MAX25262AFOC/VY+T-both use the same FCQFN-17 3.5mm × 3.75mm outline and identical pin functions. They share identical PCB footprints, thermal pads, and layout guidelines. However, the MAX25263AFOC/VY+T delivers 3A vs. 2A and features lower RDS(on) MOSFETs, requiring no layout change but enabling higher current capability.
What protection features are integrated into the MAX25263AFOC/VY+T?
The MAX25263AFOC/VY+T integrates cycle-by-cycle overcurrent protection, thermal shutdown at +170°C (15°C hysteresis), input undervoltage lockout (BIAS UVLO at 2.65V/3.1V), output overvoltage/undervoltage detection via PGOOD, and hiccup-mode recovery for sustained faults. These protections are fully functional across the –40°C to +125°C operating range and do not require external components.
MAX25263AFOC/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 20V
- Current - Output:
- 3A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX25263AFOC/VY+T FAQ
1.How can I place an order for MAX25263AFOC/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25263AFOC/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 MAX25263AFOC/VY+T reliable?
The price and inventory of MAX25263AFOC/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 MAX25263AFOC/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25263AFOC/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25263AFOC/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25263AFOC/VY+T?
MAX25263AFOC/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25263AFOC/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 MAX25263AFOC/VY+T?
For technical support, including MAX25263AFOC/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25263AFOC/VY+T requirements.
6.How does Aetrix verify that MAX25263AFOC/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25263AFOC/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 MAX25263AFOC/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25263AFOC/VY+T?
All MAX25263AFOC/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25263AFOC/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 MAX25263AFOC/VY+T part is unused and in its original packaging.
Return procedure for MAX25263AFOC/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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