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Analog Devices Inc./Maxim Integrated MAX25240AFFD/VY+
- Part No.:
- MAX25240AFFD/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25240AFFD/VY+.pdf
- Description:
- IC REG BUCK BST ADJ/3V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:506
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Product details
Overview
MAX25240AFFD/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 outputs. 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 power rails.
For engineers reviewing the MAX25240AFFD/VY+ datasheet, MAX25240AFFD/VY+ pinout, MAX25240AFFD/VY+ application, or MAX25240AFFD/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 synchronization capability with external clocks for noise-sensitive automotive systems.
Technical Context
The MAX25240AFFD/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 mode transitions without regulation loss.
It supports three SYNC-configurable operation modes: skip mode (95μA IQ), forced PWM (FPWM), or external clock synchronization (±20% frequency lock-in within two cycles); spread-spectrum modulation (±6%) is enabled via SPS pin and disabled during external sync. The internal 1.8V VCC LDO powers control logic and is biased from VIN until startup completion, then switches to VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - supports cold-crank (2V) and load-dump (42V transient tolerant) conditions in automotive environments. |
| Output Current | Up to 6A continuous - dependent on VIN/VOUT ratio and thermal design; validated at full load with 22-pin FC2QFN package (θJA = 22.4°C/W on EV kit board). |
| Switching Frequencies | 2.1MHz / 400kHz / 200kHz - selectable via part number trim; 2.1MHz enables compact 1.0μH inductors and avoids AM band interference. |
| Quiescent Current | 95μA in standby, 5μA in shutdown - meets OEM requirements for always-on vehicle modules with low battery drain. |
| Output Voltage Options | Fixed 5V or 11.5V, or adjustable 3V–20V via FB resistor divider - regulated to ±2% over line/load/temperature. |
| Protection Features | Undervoltage lockout (4.2V rise), overvoltage protection (108% VOUT), thermal shutdown (175°C), cycle-by-cycle current limit (10A typ), and hiccup mode recovery. |
| Operating Temperature | −40°C to +125°C (Grade 1 AEC-Q100) - qualified for under-hood and ECU applications requiring long-term reliability. |
Pinout & Package
MAX25240AFFD/VY+ is housed in a thermally enhanced 22-pin FC2QFN package (4.25mm × 4.25mm × 0.75mm) with exposed thermal pad, optimized for high-power density and low θJB (7.6°C/W on 4-layer JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 | Bootstrap capacitor node for LX1 | Drives HS1 gate; requires 0.1μF ceramic cap between BST1 and LX1 to sustain high-side FET conduction. |
| SUP | Main power input | Supplies buck-boost converter and internal VCC LDO; must be bypassed with ≥4.7μF ceramic to PGND1. |
| PGND1 / PGND2 | Power ground nodes | Separate grounds for buck (LS1) and boost (LS2) paths; must be joined at single star point with AGND for noise isolation. |
| LX1 / LX2 | Switching nodes | Connect opposite ends of power inductor; drive internal H-bridge FETs; require low-inductance layout to minimize ringing. |
| OUT | Regulated output | Delivers up to 6A; connects to output capacitor bank and downstream loads; PGOOD monitors this rail. |
| EN | Enable control | High-voltage-tolerant (up to 42V); asserts device from shutdown; compatible with direct battery connection. |
| FB | Voltage feedback input | Sets output: tie to VCC for fixed 5V/11.5V; use resistor divider for 3V–20V adjustment; 0.800V reference accuracy. |
| COMP | Error amplifier output | Connects RC compensation network to AGND to stabilize loop response; critical for transient performance. |
| SPS | Spread-spectrum enable | High = ±6% frequency dithering active; low = fixed-frequency operation; disabled automatically during external sync. |
| SYNC | Mode control & sync input | GND = skip mode; VCC = FPWM; external clock = synchronization (±20% lock range, 2-cycle acquisition). |
| PGOOD | Open-drain power-good indicator | Asserts low when VOUT < 93% of target; deasserts at >94%; pulled high externally; active during soft-start/shutdown. |
| VCC | Internal 1.8V LDO output | Powers internal logic; requires ≥4.7μF ceramic bypass to AGND; sourced from VIN until startup completes. |
| AGND | Analog ground reference | Must connect to PGND1/PGND2 at single-point star ground to avoid noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| H-Bridge Integration | Four internal MOSFETs (HS1/LS1/HS2/LS2) with 20mΩ typical RDSON eliminate external switch count and reduce BOM cost by ~30% vs discrete solutions. |
| Multi-Frequency Selection | 2.1MHz option enables sub-2mm height designs with 1.0μH inductors and <10mVpp output ripple; lower frequencies improve efficiency at heavy loads. |
| Automotive Transient Robustness | Tolerates 42V input transients and supports 42V-rated EN pin - eliminates need for upstream TVS or pre-regulator in 12V/24V systems. |
| Low-IQ Skip Mode | 95μA quiescent current at no load extends battery life in always-on domains (e.g., telematics, camera wake-up circuits) without sacrificing regulation. |
| Thermally Optimized FC2QFN | 22-pin 4.25mm × 4.25mm package delivers 7.6°C/W junction-to-board thermal resistance - sustains 6A output at +85°C ambient with minimal heatsinking. |
Applications
| ADAS ECU Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers radar sensor SoCs and image signal processors in autonomous driving ECUs where input voltage varies from 2.8V (cold crank) to 16V (normal operation) and load steps exceed 3A. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/1.8V rails; manages seamless buck→buck-boost→boost transitions during engine start-stop cycles. Use Value: Eliminates need for dual-stage (buck + boost) solutions; 2.1MHz operation reduces filter size by 60% vs 400kHz, saving PCB area in space-constrained front-end modules. | Use Scenario: Supplies display controller, audio DSP, and USB-C PD interface in center-stack infotainment units subject to 42V load-dump events and wide temperature swings. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete buck-boost controllers + external FETs; provides PGOOD for system-level power sequencing and fault reporting. Use Value: AEC-Q100 Grade 1 qualification ensures 15-year field reliability; spread-spectrum mode reduces EMI peaks by 10dB, easing CISPR 25 Class 5 compliance. |
| Body Control Module (BCM) | Start-Stop System Auxiliary Rail |
Use Scenario: Generates 3.3V/5V for door module microcontrollers and LIN transceivers in body electronics, operating continuously during vehicle sleep mode. IC Role / Device Role / Timing Role: Always-on buck-boost regulator with ultra-low IQ; uses EN pin for controlled wake-up from vehicle CAN bus activity. Use Value: 5μA shutdown current prevents battery drain over weeks of parking; 42V EN tolerance allows direct connection to unregulated battery without level-shifting circuitry. | Use Scenario: Provides stable 12V auxiliary rail for HVAC actuators and safety-critical sensors during engine restart, where battery voltage dips to 6V and surges to 14.5V. IC Role / Device Role / Timing Role: High-efficiency buck-boost converter maintaining regulation across full start-stop cycle; leverages 400kHz mode for optimal efficiency at 4–6A loads. Use Value: Cycle-by-cycle current limit prevents thermal runaway during motor stall events; thermal shutdown (175°C) with 20°C hysteresis ensures safe recovery without system reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480-Q1 | 3.5V–36V input, 8A max, fixed 2.1MHz only, no spread-spectrum, 16-pin WQFN | Lacks adjustable frequency and EMI dithering; higher IQ (15μA shutdown) but higher current rating | Choose for higher output current needs where EMI control is handled externally or less stringent. |
| TPS63802DRLR | 2.5V–15V input, 4A max, 2.4MHz only, no AEC-Q100, 12-pin WSON | Narrower input range, non-automotive grade, no 42V transient tolerance or EN pin rating | Select for cost-sensitive non-automotive industrial applications with stable 5V–12V inputs and moderate current demand. |
Compared with LM61480-Q1 and TPS63802DRLR, MAX25240AFFD/VY+ uniquely combines 2V–36V operation, 42V transient tolerance, AEC-Q100 Grade 1 qualification, and programmable spread-spectrum - making it the only choice for safety-critical automotive buck-boost rails requiring robustness across cold-crank, load-dump, and extended temperature profiles.
Availability
MAX25240AFFD/VY+ is available at Aetrix Electronics and suitable for ADAS ECU power supplies, infotainment system core rails, and start-stop system auxiliary rails requiring stable component supply, automotive-grade traceability, and long-term lifecycle support.
Supply support for MAX25240AFFD/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 precision power, sensing, and timing solutions.
The MAX25239/MAX25240 product line delivers highly integrated, thermally robust buck-boost converters specifically engineered for automotive power systems demanding AEC-Q100 qualification, ultra-low IQ, and seamless mode transitions across wide input/output voltage ranges.
FAQ
What is the maximum continuous output current supported by MAX25240AFFD/VY+?
MAX25240AFFD/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 EV kit board. Derating applies above +85°C ambient or with higher VIN/VOUT differentials.
Does MAX25240AFFD/VY+ support external clock synchronization, and what is the acceptable frequency range?
Yes, MAX25240AFFD/VY+ supports external clock synchronization via the SYNC pin. It locks to external clocks within ±20% of its internal switching frequency (e.g., 1.68–2.52MHz for 2.1MHz variant) and achieves lock within two clock cycles. The SYNC input accepts logic-level signals with minimum pulse width of 100ns and tolerates voltages up to 6V.
How does the MAX25240AFFD/VY+ handle transitions between buck, boost, and buck-boost operating modes?
MAX25240AFFD/VY+ uses peak-current-mode control and internally preset duty-cycle limits (DMAX = 0.73 for 2.1MHz) to autonomously transition between buck, boost, and buck-boost modes based on VIN/VOUT ratio. Transitions occur without regulation loss or output disturbance, with thresholds calculated as VIN_TH = (1 – k×fSW)VOUT (boost→buck-boost) and VIN_TH = VOUT/DMAX (buck→buck-boost).
What protection features are integrated into the MAX25240AFFD/VY+?
MAX25240AFFD/VY+ integrates undervoltage lockout (4.2V rising threshold), overvoltage protection (108% VOUT), cycle-by-cycle current limiting (10A typical), thermal shutdown (175°C with 20°C hysteresis), hiccup-mode recovery for sustained overloads, and open-drain PGOOD monitoring. All protections are fully autonomous and require no external components.
Can the MAX25240AFFD/VY+ operate with an input voltage as low as 2V, and how is cold-crank performance ensured?
Yes, MAX25240AFFD/VY+ operates down to 2V input, enabling reliable startup during automotive cold-crank events. Its wide 2V–36V input range, combined with 42V transient tolerance on SUP and EN pins, eliminates need for external pre-regulators. The internal VCC LDO starts from VIN and switches to VOUT post-startup, ensuring stable bias even at ultra-low input voltages.
MAX25240AFFD/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 (10.5V)
- Voltage - Output (Max):
- 20V
- Current - Output:
- 6A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-FC2QFN (4.25x4.25)
MAX25240AFFD/VY+ FAQ
1.How can I place an order for MAX25240AFFD/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25240AFFD/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 MAX25240AFFD/VY+ reliable?
The price and inventory of MAX25240AFFD/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25240AFFD/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25240AFFD/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25240AFFD/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25240AFFD/VY+?
MAX25240AFFD/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25240AFFD/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 MAX25240AFFD/VY+?
For technical support, including MAX25240AFFD/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25240AFFD/VY+ requirements.
6.How does Aetrix verify that MAX25240AFFD/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25240AFFD/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 MAX25240AFFD/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25240AFFD/VY+?
All MAX25240AFFD/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25240AFFD/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 MAX25240AFFD/VY+ part is unused and in its original packaging.
Return procedure for MAX25240AFFD/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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