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Analog Devices Inc./Maxim Integrated MAX25240AFFF/VY+
- Part No.:
- MAX25240AFFF/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25240AFFF/VY+.pdf
- Description:
- IC REG BCK BST ADJ/6.5V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:298
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Product details
Overview
MAX25240AFFF/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 while supporting fixed (5V/11.5V) or adjustable (3V–20V) output regulation. It operates in buck, boost, and seamless buck-boost modes, features 2.1MHz/400kHz/200kHz selectable switching frequency, 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 MAX25240AFFF/VY+ datasheet, MAX25240AFFF/VY+ pinout, MAX25240AFFF/VY+ application, or MAX25240AFFF/VY+ equivalent, key selection criteria include its 22-pin FC2QFN package, 95μA standby quiescent current, ±2% output voltage accuracy, 8.2A/10A configurable input current limit, and support for cold-crank (2V start) and 42V transient tolerance in automotive power systems.
Technical Context
The MAX25240AFFF/VY+ implements peak-current-mode control with automatic mode transitions between buck, buck-boost, and boost based on VIN/VOUT ratio-using internally preset DMAX (0.73 at 2.1MHz) and minimum on-time (87ns) to define transition boundaries without hysteresis. Its H-bridge architecture integrates four DMOS switches (HS1/LS1/HS2/LS2), enabling bidirectional power flow and high efficiency across wide input-output differentials.
It integrates a 1.8V VCC LDO regulator powered from SUP or OUT, supports external clock synchronization via SYNC with ±20% tracking window and two-cycle lock, and provides programmable spread-spectrum (±6%) via SPS pin-disabled only during external sync. Protection includes cycle-by-cycle current limiting, thermal shutdown at 175°C, output overvoltage (108% VFB), and undervoltage lockout on both SUP (4.45V rise) and VCC (1.6V fall).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - enables operation during automotive cold-crank (2V) and tolerates 42V transients without damage. |
| Continuous Output Current | 6A - sustained delivery under worst-case thermal conditions (θJA = 33.3°C/W on 4-layer JEDEC board). |
| Switching Frequency Options | 2.1MHz / 400kHz / 200kHz - 2.1MHz allows compact 1.0μH inductors and avoids AM band; lower frequencies improve light-load efficiency. |
| Quiescent Current | 95μA in standby - meets OEM requirements for always-on vehicle subsystems with minimal battery drain. |
| Output Voltage Accuracy | ±2% over temperature and line/load - ensures stable MCU, sensor, and camera rail regulation in ADAS applications. |
| Thermal Rating | AEC-Q100 Grade 1 (−40°C to +125°C junction) - qualified for under-hood and ECU mounting locations. |
| Protection Features | UVLO, OVP (108% VFB), PGOOD, thermal shutdown (175°C), hiccup-mode current limit - reduces need for external supervision circuitry. |
Pinout & Package
MAX25240AFFF/VY+ is housed in a thermally enhanced 4.25mm × 4.25mm × 0.75mm, 22-pin FC2QFN package with exposed thermal pad (pin 22 = AGND). The package supports high-power density layout with dual PGND planes (pins 5/6 and 9/10) and bottom-side thermal dissipation (θJCb = 6.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 1) | Bootstrap capacitor node for LX1 | Drives HS1 gate; requires 0.1μF ceramic cap between BST1 and LX1 to sustain high-side conduction. |
| SUP (Pin 2) | Main power input | Supplies converter core and internal VCC LDO; must be bypassed with ≥4.7μF ceramic to PGND1. |
| PGND1 (Pins 5,6) | Power ground for buck-side FETs | Low-inductance return path for LS1; must be star-connected with PGND2 and AGND. |
| LX1 (Pin 7), LX2 (Pin 8) | H-bridge switching nodes | Connect opposite ends of power inductor; define buck-boost energy transfer path with controlled dead time (3ns). |
| OUT (Pin 12) | Regulated output | Delivers up to 6A; connects to feedback divider (FB) or directly to VCC for fixed 5V/11.5V options. |
| EN (Pin 15) | Enable control | High-voltage tolerant (up to 42V); asserts device from shutdown (5μA IQ) into regulation with 2.5ms soft-start. |
| FB (Pin 16) | Voltage feedback input | Sets output via resistor divider; referenced to 0.800V internal bandgap (±1.75% tolerance) for 3V–20V adjustment. |
| PGOOD (Pin 20) | Open-drain power-good indicator | Asserts low when VOUT falls below 93% of target; debounced (40μs) and active during soft-start/shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated H-bridge FETs | Eliminates 4 external MOSFETs and associated gate drivers; RDSON ≤35mΩ per switch reduces conduction loss at 6A. |
| Spread-spectrum modulation | ±6% frequency dither enabled by SPS pin - lowers peak EMI by >10dB without requiring external filtering components. |
| Three-frequency selection | Hardware-configurable (not pin-strapped) via internal trimming - enables optimal trade-off between size (2.1MHz), efficiency (400kHz), and noise (200kHz). |
| Automotive-grade protection suite | Includes 42V transient tolerance, 175°C thermal shutdown with 20°C hysteresis, and hiccup-mode recovery - improves field reliability in harsh environments. |
| Low-IQ standby mode | 95μA supply current with EN high and no load - extends battery life in always-on infotainment and telematics modules. |
Applications
| ADAS ECU Power Supply | Infotainment System Core Rail |
|---|---|
|
Use Scenario: Powers radar processor, image signal processor, and CAN transceivers in forward collision warning ECUs. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/11.5V from 6V–16V battery with cold-crank support. Use Value: Maintains regulation during engine start (2V dip) and rejects alternator ripple via 2.1MHz switching and integrated PGOOD monitoring. |
Use Scenario: Supplies SoC, display controller, and audio codec in head-unit systems with variable load profiles. IC Role / Device Role / Timing Role: Adjustable-output (3.3V/5V/12V) point-of-load regulator with skip-mode efficiency at idle. Use Value: Achieves >90% efficiency at 100mA–6A loads using FPWM/skip mode auto-selection and 95μA standby IQ. |
| Body Control Module (BCM) | Start-Stop System Auxiliary Rail |
|
Use Scenario: Provides regulated 5V for door module microcontrollers, LIN transceivers, and LED drivers. IC Role / Device Role / Timing Role: Fixed 5V output converter with EN-controlled sequencing and PGOOD status reporting to main MCU. Use Value: Enables robust wake-up from deep sleep (5μA shutdown) and withstands load-dump transients up to 42V. |
Use Scenario: Generates stable 12V auxiliary rail for HVAC actuators and safety sensors during engine-off battery-only operation. IC Role / Device Role / Timing Role: Buck-boost regulator operating from 6V–36V battery, supporting stop-start cycling without brownout. Use Value: Delivers full 6A output even at 8V input (buck-boost mode), eliminating need for backup capacitors or secondary converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25239AFFF/VY+ | Same 22-pin FC2QFN package and pinout; differs only in factory-trimmed switching frequency (2.1MHz vs. 400kHz for MAX25240). | Optimized for higher-frequency designs requiring smaller magnetics and lower output ripple. | Select MAX25239AFFF/VY+ when 2.1MHz operation is required; MAX25240AFFF/VY+ is preferred for higher efficiency at medium loads. |
| LM61480QRNXTQ1 | Single-switch buck-boost (not H-bridge); 3.5V–36V input; 5A max; no integrated spread-spectrum or PGOOD. | Lacks seamless buck-boost transition and automotive-grade protection (no 42V transient rating or AEC-Q100 Grade 1). | Use LM61480QRNXTQ1 only in non-safety-critical body electronics where cost is prioritized over transient robustness and mode flexibility. |
Compared with MAX25239AFFF/VY+, the MAX25240AFFF/VY+ offers identical packaging and protection but targets 400kHz operation for improved mid-load efficiency, while the LM61480QRNXTQ1 lacks H-bridge topology, spread-spectrum, and full automotive transient compliance-making it unsuitable for ADAS or start-stop systems requiring seamless VIN/VOUT crossover.
Availability
MAX25240AFFF/VY+ is available at Aetrix Electronics and suitable for ADAS ECU, infotainment systems, and start-stop auxiliary power supplies requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for MAX25240AFFF/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 MAX252xx family was designed specifically for automotive power conversion-integrating H-bridge FETs, spread-spectrum EMI control, and AEC-Q100 Grade 1 reliability to replace multi-chip discrete buck-boost solutions in space-constrained ECUs.
FAQ
What is the maximum continuous output current of the MAX25240AFFF/VY+?
The MAX25240AFFF/VY+ delivers 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 4-layer JEDEC board, it sustains 6A with junction temperature below 125°C. Derating applies above 70°C ambient due to θJA = 33.3°C/W.
Does the MAX25240AFFF/VY+ support fixed-output voltage configurations?
Yes, the MAX25240AFFF/VY+ supports fixed-output voltages of 5.0V and 11.5V by connecting the FB pin directly to the VCC pin (1.8V). These factory-trimmed options provide ±2% accuracy over temperature and line/load, eliminating external feedback resistors for simplified design in standard rail applications.
How does the MAX25240AFFF/VY+ handle input voltage transients common in automotive systems?
The MAX25240AFFF/VY+ tolerates input transients up to 42V on the SUP and EN pins, with absolute maximum ratings confirmed in the datasheet. Its undervoltage lockout (4.45V rise) and overvoltage protection (108% VFB) ensure safe operation during load dump and cold-crank events without external TVS clamping in most cases.
Can the MAX25240AFFF/VY+ be synchronized to an external clock source?
Yes, the MAX25240AFFF/VY+ accepts external clock signals on the SYNC pin, locking to frequencies within ±20% of its internal oscillator (e.g., 1.68–2.52MHz for 2.1MHz option). Synchronization occurs within two cycles, and the device reverts to internal clock if SYNC signal is absent for more than two periods.
What thermal performance can be expected from the MAX25240AFFF/VY+ in a typical automotive PCB layout?
In a 4-layer JEDEC board, the MAX25240AFFF/VY+ exhibits θJA = 33.3°C/W and θJCb = 6.4°C/W. With proper thermal pad soldering and 2 cm² copper pour, it maintains <125°C junction temperature at 6A/14V→5V conversion. On optimized EV kit boards, θJA drops to 22.4°C/W, enabling higher power density.
MAX25240AFFF/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):
- 6.5V (11.5V)
- Voltage - Output (Max):
- 20V
- 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)
MAX25240AFFF/VY+ FAQ
1.How can I place an order for MAX25240AFFF/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25240AFFF/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 MAX25240AFFF/VY+ reliable?
The price and inventory of MAX25240AFFF/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25240AFFF/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25240AFFF/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25240AFFF/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25240AFFF/VY+?
MAX25240AFFF/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25240AFFF/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 MAX25240AFFF/VY+?
For technical support, including MAX25240AFFF/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25240AFFF/VY+ requirements.
6.How does Aetrix verify that MAX25240AFFF/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25240AFFF/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 MAX25240AFFF/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25240AFFF/VY+?
All MAX25240AFFF/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25240AFFF/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 MAX25240AFFF/VY+ part is unused and in its original packaging.
Return procedure for MAX25240AFFF/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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