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Analog Devices Inc./Maxim Integrated MAX25263AFOC/VY+
- Part No.:
- MAX25263AFOC/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX25263AFOC/VY+.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,315
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Product details
Overview
MAX25263AFOC/VY+ from Analog Devices is an AEC-Q100 qualified automotive synchronous buck converter with integrated 3.4A high-side and 4.75A low-side MOSFETs, delivering up to 3A output current across a 3.5V–65V input range while consuming only 3.5μA quiescent current. It features fixed 2.1MHz switching frequency, 20ns minimum on-time, 98% max duty cycle, and supports fixed 5V/3.3V or adjustable 1V–20V outputs-designed for double-battery automotive power rails in instrument clusters and head units.
For engineers reviewing the MAX25263AFOC/VY+ datasheet, MAX25263AFOC/VY+ pinout, MAX25263AFOC/VY+ application, or MAX25263AFOC/VY+ equivalent, key selection considerations include its 3A current rating, 65V automotive input tolerance, PGOOD monitoring, spread-spectrum EMI reduction, and FCQFN-17 (3.5mm × 3.75mm) flip-chip package optimized for low EMI in space-constrained modules.
Technical Context
This is a current-mode, fixed-frequency synchronous buck regulator with internal gate drivers, programmable soft-start, and cycle-by-cycle overcurrent protection. It integrates a 5V BIAS LDO (bypassable via EXTVCC), phase-locked loop (PLL) for external clock synchronization, and thermal shutdown at +170°C with 15°C hysteresis.
The IC implements frequency foldback (2.1MHz → 262.5kHz) when VIN drops near VOUT to sustain 98% duty cycle regulation, and supports dual operating modes: skip mode (SYNC = low) for ultra-low IQ, and forced PWM (SYNC = high or external clock) for predictable EMI and improved transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-power automotive loads like display backlight drivers or MCU power rails without external boost stages. |
| Input Voltage Range | 3.5V to 65V - withstands cold-crank (4.5V), load-dump (60V+), and dual-battery transients per ISO 7637-2. |
| Quiescent Current | 3.5μA typical at no load - enables always-on functionality in vehicle body control modules with <100μA system standby budgets. |
| Switching Frequency | 2.1MHz fixed - allows use of sub-3.3μH inductors and <30μF ceramic output capacitors, minimizing solution footprint. |
| Min On-Time | 20ns typical - enables direct 24V-to-3.3V conversion at 2.1MHz without pulse-skipping or instability. |
| Duty Cycle Max | 98% - sustains regulation during undervoltage transients down to ~3.4V input for 3.3V output. |
| PGOOD Threshold | ±2% window (93–97% rising, 91.5–95.5% falling) - provides precise power-rail sequencing and fault detection for ASIL-B subsystems. |
Pinout & Package
MAX25263AFOC/VY+ uses a 17-pin FCQFN (flip-chip quad flat no-lead) package measuring 3.5mm × 3.75mm with exposed thermal pad (EP). The symmetrical SUP/PGND pin layout minimizes high-di/dt loop area and enhances EMI immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGOOD) | Open-drain power-good indicator | Signals output regulation status; requires external 20kΩ pull-up; asserts low on UV/OV faults after 47–63μs debounce. |
| 2 (EN) | High-voltage enable input | Active-high logic input tolerant to 70V - simplifies direct connection to 12V/24V battery rails without level-shifting. |
| 3,9 (SUP) | High-side supply input | Each supplies internal gate driver and bias LDO; requires local 2.2μF + 0.1μF ceramic bypass for EMI suppression. |
| 5,7 (PGND) | Power ground return | Low-impedance path for high-current LX switching; must be tied directly to EP and input capacitor ground. |
| 6 (LX) | Switch node | Connects to inductor; carries full AC ripple current; requires minimal trace length and no vias to reduce EMI radiation. |
| 10 (BST) | Bootstrap capacitor terminal | Connects 0.1μF ceramic cap to LX; powers high-side gate driver; critical for maintaining RDS(on) stability. |
| 11 (GND) | Analog ground reference | Separate from PGND to isolate noise-sensitive feedback and oscillator circuits; connects to AGND plane. |
| 12 (BIAS) | Internal 5V LDO output | Powers internal circuitry; bypassed with ≥2.2μF ceramic; can be overridden by EXTVCC for efficiency optimization. |
| 13 (FB) | Feedback voltage sense | Accepts resistor divider for 1V–20V adjustment or connects to BIAS for factory-fixed 3.3V/5V output. |
| 14 (EXTVCC) | External bias supply input | Accepts 3.25V–5.5V to disable internal LDO; reduces power dissipation and improves light-load efficiency. |
| 15 (OUT) | Output voltage sense | Used with internal preset divider when FB = BIAS; enables accurate remote sensing for high-current applications. |
| 16 (SYNC) | Frequency synchronization input | Enables skip mode (low), forced PWM (high/bias), or PLL lock to external clock (25–75% duty cycle). |
| 17 (SPS) | Spread-spectrum enable | Pull high to activate ±6% triangular frequency modulation at 4.5kHz (2.1MHz) or 0.8kHz (400kHz) for EMI reduction. |
| EP | Exposed thermal pad | Must be soldered to input voltage plane (same as SUP pins) for thermal conduction and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade-1 qualification | Rated for -40°C to +125°C ambient operation - meets automotive reliability requirements for under-hood and dashboard applications. |
| Symmetrical FCQFN-17 flip-chip package | Reduces parasitic inductance in high-di/dt paths and lowers radiated emissions by >10dB compared to standard QFN layouts. |
| Programmable soft-start time | 2.75–4.75ms (2.1MHz) or 4–6ms (400kHz) - prevents inrush current and ensures controlled power-up in multi-rail systems. |
| Hiccup-mode overcurrent protection | Shuts down for 10ms then auto-restarts - protects against sustained short-circuits without latch-off, supporting fail-operational safety goals. |
| Undervoltage lockout (UVLO) | 3.1V rising / 2.65V falling threshold on BIAS - prevents erratic startup during battery brownouts and ensures clean enable sequencing. |
Applications
| Double Battery Automotive Systems | Automotive Instrument Cluster |
|---|---|
Use Scenario: Powering 3.3V microcontroller and CAN transceiver from 12V/48V dual-battery architecture during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator providing stable 3.3V rail with 65V input tolerance and 98% duty cycle hold-up. Use Value: Eliminates need for pre-regulator stage; maintains MCU operation down to 4.5V input; PGOOD enables safe firmware boot sequencing. | Use Scenario: Supplying 5V to TFT-LCD display driver ICs and touch controller in digital dashboards with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency, low-noise power source using 2.1MHz switching and spread-spectrum modulation to avoid AM band interference. Use Value: Meets CISPR 25 Class 5 radiated emissions without ferrite beads or shielding cans; 3.5μA IQ extends battery life in key-off mode. |
| Navigation and Radio Head Units | Distributed DC Power Systems |
Use Scenario: Generating 12V intermediate rail from 48V battery to feed audio amplifier and GPS module in infotainment systems. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 12V with external resistor divider and EXTVCC bypass for peak efficiency. Use Value: Achieves >92% efficiency at 2A load; EXTVCC switchover reduces internal power loss by 35% vs. internal LDO operation. | Use Scenario: Local point-of-load regulation for ADAS camera modules requiring 1.8V/2A with tight ripple and fast transient response. IC Role / Device Role / Timing Role: Compact 3.5mm × 3.75mm buck converter delivering 1.8V from 12V with 20ns min on-time and forced PWM mode. Use Value: Enables single-stage 12V→1.8V conversion without cascaded regulators; 2.1MHz operation supports <10μs load-step recovery. |
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+ | 2A rated version; identical pinout, package, and feature set except lower current limit (2.6–3.6A vs. 3.4–4.75A). | Suitable for lower-power instrument clusters or body control units where 2A suffices and thermal margin is less constrained. | Select MAX25262AFOC/VY+ when output current demand is ≤2A and cost optimization is prioritized over headroom. |
| LM61480QRNXTQ1 | 3.5A rated; 2.1MHz fixed frequency; no spread spectrum; requires external compensation; different pinout (16-pin WQFN). | Better suited for non-EMI-critical industrial applications; lacks AEC-Q100 Grade-1 certification and PGOOD accuracy specs. | Choose LM61480QRNXTQ1 only if board redesign is acceptable and spread-spectrum EMI reduction is not required. |
Compared with MAX25262AFOC/VY+, the MAX25263AFOC/VY+ delivers higher output current and tighter PGOOD thresholds for safety-critical functions; versus LM61480QRNXTQ1, it offers superior EMI performance, integrated compensation, and automotive-grade reliability without layout changes.
Availability
MAX25263AFOC/VY+ 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 ranges and long production lifecycles.
Supply support for MAX25263AFOC/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.
The MAX25262/MAX25263 product line delivers compact, high-voltage synchronous buck converters engineered specifically for automotive power systems demanding AEC-Q100 compliance, ultra-low quiescent current, and robust EMI performance in harsh environments.
FAQ
What is the maximum output current capability of the MAX25263AFOC/VY+?
The MAX25263AFOC/VY+ delivers up to 3A continuous output current, verified by its 3.4A–4.75A current-limit threshold (ILIM3A) and thermal design validated for operation at +125°C ambient. This rating assumes proper PCB copper area, thermal vias to inner layers, and airflow per the datasheet's θJA = 28°C/W specification. Derating applies above +70°C ambient.
Does the MAX25263AFOC/VY+ support adjustable output voltages?
Yes, the MAX25263AFOC/VY+ supports adjustable output voltages from 1V to 20V using an external resistor divider connected between OUT, FB, and GND. The internal feedback reference is 1.0V (typ), enabling precise calculation of RFB1 and RFB2. Fixed 3.3V and 5V outputs are also available by connecting FB to BIAS, per the device variant configuration.
How does the MAX25263AFOC/VY+ handle input voltage transients such as load dump?
The MAX25263AFOC/VY+ withstands input transients up to 65V continuously and tolerates brief spikes beyond that per its absolute maximum rating (SUP to PGND: –0.3V to +70V). Its 98% maximum duty cycle and frequency foldback (2.1MHz → 262.5kHz) maintain regulation during undervoltage events, while integrated overtemperature and hiccup-mode short-circuit protection ensure robustness during sustained overloads.
Can the MAX25263AFOC/VY+ be synchronized to an external clock?
Yes, the MAX25263AFOC/VY+ supports external clock synchronization via the SYNC pin using a phase-locked loop (PLL). It accepts external frequencies from 250kHz to 550kHz (for 400kHz mode) or 1.8MHz to 2.6MHz (for 2.1MHz mode) with 25–75% duty cycle. When synchronized, internal spread spectrum is disabled, but externally applied modulation (e.g., spread-spectrum clocks) passes through unfiltered.
What package type and thermal characteristics does the MAX25263AFOC/VY+ use?
The MAX25263AFOC/VY+ uses a 17-pin FCQFN package (3.5mm × 3.75mm) with exposed thermal pad (EP). Its thermal resistance is θJA = 28°C/W and θJC = 8°C/W on a four-layer board. The EP must be soldered to the input voltage plane for optimal heat transfer and EMI shielding, and thermal shutdown activates at +170°C with 15°C hysteresis.
MAX25263AFOC/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for MAX25263AFOC/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25263AFOC/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 MAX25263AFOC/VY+ reliable?
The price and inventory of MAX25263AFOC/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX25263AFOC/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25263AFOC/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25263AFOC/VY+?
MAX25263AFOC/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25263AFOC/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 MAX25263AFOC/VY+?
For technical support, including MAX25263AFOC/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25263AFOC/VY+ requirements.
6.How does Aetrix verify that MAX25263AFOC/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25263AFOC/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 MAX25263AFOC/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25263AFOC/VY+?
All MAX25263AFOC/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25263AFOC/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 MAX25263AFOC/VY+ part is unused and in its original packaging.
Return procedure for MAX25263AFOC/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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