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Analog Devices Inc./Maxim Integrated MAX25239AFFB/VY+
- Part No.:
- MAX25239AFFB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25239AFFB/VY+.pdf
- Description:
- IC REG BUCK BST ADJ/3V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:837
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Product details
Overview
MAX25239AFFB/VY+ from Analog Devices is an automotive-grade synchronous buck-boost DC-DC converter with integrated H-bridge FETs, delivering up to 6A continuous output current across a 2V–36V input range and supporting fixed (5V/11.5V) or adjustable (3V–20V) output voltages. It operates at 2.1MHz/400kHz/200kHz switching frequencies, features 95μA standby quiescent current, and includes PGOOD, spread-spectrum EMI reduction, and AEC-Q100 Grade 1 (−40°C to +125°C) qualification for ADAS ECU and infotainment power supplies.
For engineers reviewing the MAX25239AFFB/VY+ datasheet, MAX25239AFFB/VY+ pinout, MAX25239AFFB/VY+ application, or MAX25239AFFB/VY+ equivalent, key selection criteria include input transient tolerance (42V), EN pin voltage rating (up to 42V), thermal performance in FC2QFN packages, cycle-by-cycle current limiting, and SYNC-controlled skip/PWM mode transitions.
Technical Context
The MAX25239AFFB/VY+ implements peak-current-mode control across three operating modes-buck, boost, and buck-boost-dynamically transitioning based on VIN/VOUT ratio using internally preset duty-cycle limits (DMAX = 0.73 for 2.1MHz variant). Its H-bridge architecture integrates four MOSFETs (HS1/LS1/HS2/LS2) with 20mΩ typical RDSON, enabling seamless regulation when input voltage crosses output voltage.
It integrates a 1.8V VCC LDO regulator powered from SUP or OUT, supports soft-start (2.5ms ramp), hiccup-mode overload recovery (5ms retry), and programmable spread-spectrum (±6%) disabled during external SYNC. The PGOOD output asserts low below 93% of regulated VOUT and deasserts above 94%, with 40μs debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - supports cold-crank (2V) and load-dump (42V transient tolerant) automotive operation |
| Output Current | Up to 6A continuous - dependent on VIN/VOUT ratio and thermal design; validated at 14V IN / 5V OUT |
| Switching Frequencies | 2.1MHz / 400kHz / 200kHz - 2.1MHz enables compact 1μH inductors and avoids AM band interference |
| Quiescent Current | 95μA in standby - meets OEM requirements for always-on vehicle modules |
| Thermal Rating | AEC-Q100 Grade 1 (−40°C to +125°C) - qualified for under-hood and ECU environments |
| Protection Features | UVLO, OVLO, thermal shutdown (175°C), cycle-by-cycle current limit, short-circuit hiccup - ensures robust system-level reliability |
| Feedback Accuracy | ±2% over temperature - achieved via 0.800V ±14mV internal reference and low FB leakage (≤1μA) |
Pinout & Package
MAX25239AFFB/VY+ is housed in a thermally enhanced 22-pin FC2QFN package (4.25mm × 4.25mm × 0.75mm) with exposed thermal pad. Pin 1 is BST1; pins 5 and 6 are PGND1; pins 9 and 10 are PGND2; pin 22 is AGND. All PGND and AGND connections must be joined at a single star point.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 | Bootstrap capacitor node for LX1 high-side driver | Requires 0.1μF ceramic cap between BST1 and LX1; enables HS1 gate drive above VIN |
| SUP | Main power input for converter and VCC LDO | Bypass with ≥4.7μF ceramic to PGND1; accepts 2V–36V with 42V transient tolerance |
| PGND1 / PGND2 | Power ground return paths for LS1 and LS2 | Must be connected together and to AGND at single-point star ground to minimize noise coupling |
| LX1 / LX2 | H-bridge switching nodes | Connect external inductor between LX1 and LX2; each rated for −0.3V to VSUP+0.3V (LX1) or VOUT+0.3V (LX2) |
| OUT | Regulated output terminal | Delivers up to 6A; supports fixed (5V/11.5V) or resistor-divider-adjusted (3V–20V) regulation |
| EN | High-voltage enable input | Logic-high (>1.3V) enables operation; tolerates up to 42V - direct connection to battery possible |
| FB | Feedback input for output voltage sensing | Connect to resistor divider from OUT to AGND; tied to VCC for fixed 5V/11.5V options |
| COMP | Error amplifier output | Interface for RC compensation network (R-C from COMP to AGND) to stabilize loop dynamics |
| SPS | Spread-spectrum enable control | High = ±6% frequency dither enabled; low = fixed-frequency; disabled during external SYNC |
| SYNC | Mode selection and clock synchronization | GND = skip mode; VCC = forced PWM; external clock = synchronization (±20% range, 2-cycle lock) |
| PGOOD | Open-drain power-good indicator | Pulls low when VOUT < 93% target; high-Z when >94%; active-low during soft-start/shutdown |
| VCC | Internal 1.8V LDO output | Supplies internal circuitry; bypass with ≥4.7μF ceramic to AGND; powers up from SUP or OUT |
| AGND | Analog ground reference | Must tie to PGND1/PGND2 at single-point star ground; separates analog and power return paths |
Key Features
| Feature | Design Value |
|---|---|
| Integrated H-bridge with 20mΩ RDSON | Eliminates 4 external MOSFETs and associated gate drivers, reducing BOM count and layout area by >30% |
| Three selectable switching frequencies | 2.1MHz enables <1.0μH inductors and <22μF output capacitance; 400kHz/200kHz improve full-load efficiency by 2–3% |
| 95μA standby quiescent current | Enables always-on functionality in ADAS cameras and domain controllers without draining battery during sleep |
| 42V input transient tolerance | Withstands ISO 7637-2 pulse 5a (load dump) without external TVS, simplifying front-end protection |
| Programmable spread-spectrum (±6%) | Reduces peak EMI emissions by 10dB at fundamental switching frequency, easing CISPR 25 Class 5 compliance |
| AEC-Q100 Grade 1 qualification | Validated for 95,000 hours at TJ = +125°C - suitable for safety-critical body control and ADAS applications |
Applications
| ADAS ECU Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers vision processor SoC and radar sensor interface in autonomous driving domain controller. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/1.8V rails from 9V–16V battery with cold-crank support. Use Value: 2V start-up capability maintains operation during engine cranking; 6A output sustains burst processing loads without rail collapse. | Use Scenario: Supplies display controller, audio DSP, and USB hub in center-stack infotainment head unit. IC Role / Device Role / Timing Role: Adjustable-output (3.3V/5V/12V) point-of-load regulator with dynamic voltage scaling. Use Value: 2.1MHz operation minimizes inductor size and EMI filtering components; spread-spectrum reduces radiated emissions near sensitive RF receivers. |
| Body Control Module (BCM) | Start-Stop System Auxiliary Rail |
Use Scenario: Powers door module microcontroller, LED drivers, and LIN transceivers in centralized BCM. IC Role / Device Role / Timing Role: Fixed 5V output regulator with ultra-low IQ for always-on wake-up circuitry. Use Value: 95μA standby current extends battery life during vehicle park mode; EN pin's 42V rating allows direct battery connection without level-shifting. | Use Scenario: Generates stable 3.3V logic rail for CAN FD gateway and sensor fusion MCU during engine restart. IC Role / Device Role / Timing Role: High-input-range buck-boost maintaining regulation during 6V–36V battery transients. Use Value: Tolerates 42V transients per ISO 7637-2 without external clamping; thermal shutdown prevents latch-up during repeated start-stop cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25240AFFB/VY+ | Same package and pinout; differs only in factory-trimmed switching frequency (200kHz vs. 2.1MHz for MAX25239AFFB/VY+) | Lower-frequency variant better suited for high-efficiency, low-noise applications where EMI filtering is prioritized over size | Select MAX25240AFFB/VY+ when 200kHz operation improves thermal performance or simplifies EMI filter design |
| LM61480-Q1 | 3.5V–36V input, 8A output, fixed 2.1MHz; no adjustable frequency or spread-spectrum; uses external MOSFETs | Higher current capability but requires 4 external FETs and gate drivers - larger solution size and higher BOM cost | Choose LM61480-Q1 only if >6A output or external FET flexibility is required; MAX25239AFFB/VY+ offers superior integration |
Compared with MAX25240AFFB/VY+, the MAX25239AFFB/VY+ provides higher-frequency operation for smaller magnetics and lower EMI peaks, while LM61480-Q1 trades integration for raw current headroom and lacks spread-spectrum - making MAX25239AFFB/VY+ optimal for space-constrained, EMI-sensitive ADAS modules.
Availability
MAX25239AFFB/VY+ is available at Aetrix Electronics and suitable for ADAS ECU, infotainment systems, and body electronics requiring stable component supply, AEC-Q100 compliance, and automotive-grade thermal reliability.
Supply support for MAX25239AFFB/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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX25239/MAX25240 product line delivers highly integrated, AEC-Q100-qualified buck-boost converters optimized for automotive power architectures requiring wide VIN, low IQ, and robust transient handling in ADAS and infotainment subsystems.
FAQ
What is the maximum continuous output current supported by the MAX25239AFFB/VY+?
The MAX25239AFFB/VY+ supports up to 6A continuous output current depending on input-to-output voltage ratio, PCB thermal design, and ambient temperature. At 14V input and 5V output with 2.1MHz switching, it delivers 6A with ≤40°C temperature rise on a 4-layer JEDEC board. Derating applies above +70°C ambient per its 33.3°C/W θJA rating.
Does the MAX25239AFFB/VY+ support both fixed and adjustable output voltages?
Yes, the MAX25239AFFB/VY+ supports fixed 5V and 11.5V outputs (by connecting FB to VCC) as well as externally adjustable outputs from 3V to 20V (using a resistor divider from OUT to AGND). The feedback reference is tightly regulated at 0.800V ±14mV, ensuring ±2% output accuracy across temperature and line/load conditions.
How does the SYNC pin configure operating modes on the MAX25239AFFB/VY+?
The SYNC pin on the MAX25239AFFB/VY+ selects three modes: grounding SYNC enables skip mode for ultra-low IQ at light loads; tying SYNC to VCC forces fixed-frequency PWM; applying an external clock (280kHz–2.7MHz) synchronizes switching. The device locks to external clocks within two cycles and reverts to internal oscillator if sync is lost for >2 cycles.
What protection features are integrated into the MAX25239AFFB/VY+?
The MAX25239AFFB/VY+ integrates undervoltage lockout (4.2V rising, 1.9V falling), overvoltage protection (108% VOUT threshold), cycle-by-cycle current limiting (8.2A/10A options), thermal shutdown (175°C), and hiccup-mode recovery. Its PGOOD output provides real-time regulation status with 40μs debounce, and all protections are fully operational across −40°C to +125°C.
Is the MAX25239AFFB/VY+ pin-compatible with other variants in the MAX25239/MAX25240 family?
Yes, the MAX25239AFFB/VY+ shares identical 22-pin FC2QFN pinout and footprint with MAX25240AFFB/VY+, differing only in factory-trimmed switching frequency (2.1MHz vs. 200kHz). Both support identical EN, FB, COMP, SPS, and SYNC functions, enabling drop-in replacement where frequency selection aligns with system EMI and efficiency targets.
MAX25239AFFB/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 22-PowerWFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3V (5V)
- Voltage - Output (Max):
- 6.5V
- Current - Output:
- 6A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-FC2QFN (4.25x4.25)
MAX25239AFFB/VY+ FAQ
1.How can I place an order for MAX25239AFFB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25239AFFB/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 MAX25239AFFB/VY+ reliable?
The price and inventory of MAX25239AFFB/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25239AFFB/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25239AFFB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25239AFFB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25239AFFB/VY+?
MAX25239AFFB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25239AFFB/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 MAX25239AFFB/VY+?
For technical support, including MAX25239AFFB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25239AFFB/VY+ requirements.
6.How does Aetrix verify that MAX25239AFFB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25239AFFB/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 MAX25239AFFB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25239AFFB/VY+?
All MAX25239AFFB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25239AFFB/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 MAX25239AFFB/VY+ part is unused and in its original packaging.
Return procedure for MAX25239AFFB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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