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Analog Devices Inc./Maxim Integrated MAX25239AFFD/VY+
- Part No.:
- MAX25239AFFD/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-PowerWFQFN
- Datasheet:
-
MAX25239AFFD/VY+.pdf
- Description:
- IC REG BUCK BST ADJ/3V 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:340
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Product details
Overview
MAX25239AFFD/VY+ from Analog Devices is an automotive-grade synchronous buck-boost DC-DC converter with integrated H-bridge MOSFETs, delivering up to 6A continuous output current across a 2V–36V input range, supporting fixed 5V/11.5V or adjustable 3V–20V outputs, and operating in buck, boost, or buck-boost modes - used in ADAS ECUs for stable power under cold-crank and load-dump conditions.
For engineers reviewing the MAX25239AFFD/VY+ datasheet, MAX25239AFFD/VY+ pinout, MAX25239AFFD/VY+ application, or MAX25239AFFD/VY+ equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (-40°C to +125°C), 95μA standby quiescent current, 2.1MHz/400kHz/200kHz selectable switching frequency, spread-spectrum EMI reduction, and integrated PGOOD monitoring for safety-critical automotive power rails.
Technical Context
The MAX25239AFFD/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 employs four internal DMOS switches (HS1/LS1/HS2/LS2) with 20mΩ typical RDS(ON) per FET.
It integrates a 1.8V VCC LDO regulator powered from VIN or VOUT, supports SYNC-driven FPWM/skip mode selection and external clock synchronization within ±20% of internal fSW, and features programmable spread-spectrum (±6%) via SPS pin - all while maintaining ±2% output voltage accuracy over temperature and line/load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V - enables operation during automotive cold-crank (down to 2V) and tolerates 42V transients. |
| Output Current | Up to 6A continuous - dependent on VIN/VOUT ratio and thermal design; supported by 8.2A/10A selectable input current limit. |
| Switching Frequencies | 200kHz / 400kHz / 2.1MHz - 2.1MHz allows compact 1μH inductors and avoids AM band interference. |
| Quiescent Current | 95μA in standby - meets OEM requirements for always-on systems like ADAS sensors and infotainment wake logic. |
| Output Voltage Options | Fixed 5V or 11.5V, or adjustable 3V–20V via resistor divider - provides flexibility for diverse rail requirements in body electronics. |
| Thermal Rating | AEC-Q100 Grade 1 (–40°C to +125°C) - qualified for under-hood and ECU applications with full lifetime reliability validation. |
| Protection Features | UVLO, OVLO, cycle-by-cycle current limit, thermal shutdown, and open-drain PGOOD - ensures robust fault handling in safety-critical automotive systems. |
Pinout & Package
MAX25239AFFD/VY+ is housed in a thermally enhanced 4.25mm × 4.25mm × 0.75mm, 22-pin FC2QFN package with exposed thermal pad (package code F224A4FY+1), optimized for high-power density and low θJA (33.3°C/W on JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 | Bootstrap capacitor node for LX1 | Supplies gate drive voltage for HS1; requires 0.1μF ceramic cap between BST1 and LX1. |
| SUP | Main power input | Accepts 2V–36V input; powers internal circuitry and VCC LDO; bypass with ≥4.7μF ceramic to PGND1. |
| PGND1 / PGND2 | Power ground terminals | Separate low-impedance return paths for buck and boost FETs; must be joined at single star point with AGND. |
| LX1 / LX2 | Switching nodes | Connect opposite ends of power inductor; drive internal H-bridge FETs; require tight layout to minimize ringing. |
| OUT | Regulated output | Delivers up to 6A; supports fixed or adjustable voltage; connects to output capacitor and feedback divider. |
| EN | Enable control | High-voltage-tolerant (up to 42V); active-high; pulls device from 5μA shutdown into regulation with 2.5ms soft-start. |
| FB | Feedback input | Sets output voltage: tie to VCC for fixed 5V/11.5V; connect resistor divider for 3V–20V adjustment (VFB = 0.800V typ). |
| COMP | Error amplifier output | Connects RC compensation network to AGND to stabilize loop; critical for transient response and stability. |
| PGOOD | Open-drain power-good indicator | Asserts low when VOUT drops below 93% of target; deasserts above 94%; requires external pull-up to ≤5.5V. |
| SYNC | Mode/frequency control | Ground = skip mode; VCC = forced PWM; external clock = synchronization (±20% range); enables PLL lock in <2 cycles. |
| SPS | Spread-spectrum enable | High = ±6% frequency dithering to reduce EMI peaks; disabled automatically during external sync. |
| VCC | Internal 1.8V LDO output | Powers internal logic; bypass with ≥4.7μF ceramic; sourced from VIN or VOUT depending on startup condition. |
| AGND | Analog reference ground | Must be connected 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 DMOS FETs (HS1/LS1/HS2/LS2) with 20mΩ typical RDS(ON) eliminate external MOSFETs and gate drivers - reducing BOM count and PCB area by >30%. |
| Automotive Qualification | AEC-Q100 Grade 1 certified with 95,000-hour lifetime at TJ = +125°C - validated for use in ADAS, infotainment, and start-stop systems. |
| Dynamic Mode Transition | Seamless buck → buck-boost → boost transitions with no output disturbance - maintains ±2% regulation across VIN/VOUT crossover points (e.g., 12.26V and 20.55V at 15VOUT/2.1MHz). |
| EMI Mitigation | Programmable ±6% spread-spectrum modulation and 2.1MHz option suppress radiated emissions - simplifies compliance with CISPR 25 Class 5. |
| Low-Power Operation | 95μA standby current and 5μA shutdown current meet OEM requirements for always-on vehicle networks and telematics modules. |
| Robust Protection Suite | Integrated UVLO (4.2V rise), OVLO (108% VOUT), thermal shutdown (175°C), and hiccup-mode current limiting - eliminates need for external protection ICs. |
Applications
| ADAS ECU Power Supply | Infotainment System Rail |
|---|---|
Use Scenario: Powers vision processing unit and radar sensor interface in autonomous driving controller under wide input variation (2V cold-crank to 36V load dump). IC Role / Device Role / Timing Role: Primary buck-boost regulator providing stable 5V/11.5V rail with PGOOD monitoring for system boot sequencing and fault reporting. Use Value: Maintains regulation during engine start/stop cycles and withstands 42V transients - eliminating need for upstream TVS or pre-regulator stages. | Use Scenario: Supplies 12V display backlight and 3.3V SoC core in head-unit during variable battery conditions and RF-heavy cabin environments. IC Role / Device Role / Timing Role: Point-of-load converter with spread-spectrum enabled to reduce EMI coupling into audio/video signal paths. Use Value: 2.1MHz operation minimizes inductor size and output ripple, while ±6% dithering lowers peak EMI by >10dB - easing EMC certification. |
| Body Control Module (BCM) | Start-Stop System Auxiliary Rail |
Use Scenario: Delivers 5V to door module microcontrollers and LIN transceivers across temperature extremes and long-term vibration exposure. IC Role / Device Role / Timing Role: Fixed-output 5V regulator with EN-controlled wake-up and ultra-low 95μA quiescent current for battery-sensitive sleep modes. Use Value: Enables >1-year battery drain life in parked vehicle state - meeting OEM parasitic current budgets without external enable logic. | Use Scenario: Generates stable 3.3V/5V auxiliary rail for CAN transceivers and MCU during engine restart when battery dips to 6V. IC Role / Device Role / Timing Role: Wide-input buck-boost converter operating in buck-boost mode near VIN = VOUT boundary to sustain regulation during cranking. Use Value: Eliminates brownout resets by maintaining output down to 2V input - ensuring uninterrupted CAN communication and sensor data logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25240AFFD/VY+ | Same pinout and package; differs only in factory-trimmed switching frequency (2.1MHz vs. 400kHz/200kHz variants) and current limit (10A vs. 8.2A). | Identical functional scope but optimized for higher-frequency designs requiring smaller magnetics and lower ripple. | Select MAX25240AFFD/VY+ when 2.1MHz operation is mandatory and 10A current limit is required for higher transient loads. |
| LM61480-Q1 | 3.5V–36V input, 8A max, fixed 2.1MHz fSW, no spread-spectrum, different pinout (16-pin WQFN), lacks PGOOD and SYNC flexibility. | Targeted at cost-sensitive non-safety-critical applications; no AEC-Q100 Grade 1 rating or hiccup-mode protection. | Choose LM61480-Q1 only for simpler, lower-reliability body electronics where PGOOD, spread-spectrum, and Grade 1 are not required. |
Compared with MAX25240AFFD/VY+, the MAX25239AFFD/VY+ offers tighter current-limit tolerance (8.2A vs. 10A) and is factory-set for 2.1MHz operation - better suited for space-constrained ADAS modules needing minimal EMI impact. Against LM61480-Q1, it delivers superior automotive robustness via AEC-Q100 Grade 1, integrated PGOOD, and flexible SYNC/SPS control - justifying its use in safety-critical power domains.
Availability
MAX25239AFFD/VY+ is available at Aetrix Electronics and suitable for ADAS ECU power supplies, infotainment system rails, and body electronics requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX25239AFFD/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 connectivity solutions.
The MAX25239AFFD/VY+ belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding vehicle subsystems requiring wide-input, high-efficiency, and AEC-Q100-compliant DC-DC conversion in space- and thermal-constrained environments.
FAQ
What is the maximum continuous output current of the MAX25239AFFD/VY+?
The MAX25239AFFD/VY+ delivers up to 6A continuous output current, dependent on input-to-output voltage ratio, switching frequency, and thermal design. At 2.1MHz and moderate VIN/VOUT differentials, it sustains 6A with proper PCB layout and heatsinking; derating applies at extreme ratios or elevated ambient temperatures per the thermal resistance data (θJA = 33.3°C/W).
Does the MAX25239AFFD/VY+ support both fixed and adjustable output voltages?
Yes, the MAX25239AFFD/VY+ supports fixed 5V or 11.5V outputs (by connecting FB to VCC) and adjustable outputs from 3V to 20V (via resistor divider between OUT and AGND). The feedback reference voltage is tightly regulated at 0.800V ±1.75%, enabling ±2% total output accuracy across line, load, and temperature.
How does the MAX25239AFFD/VY+ handle input voltage transients common in automotive systems?
The MAX25239AFFD/VY+ tolerates input transients up to 42V and features SUP pin rated to +42V, EN pin compatible up to 42V, and robust undervoltage lockout (4.2V rising threshold). It also survives cold-crank down to 2V input - making it suitable for direct-battery-connected applications without external transient suppression.
Can the MAX25239AFFD/VY+ be synchronized to an external clock source?
Yes, the MAX25239AFFD/VY+ supports external clock synchronization via the SYNC pin. When driven with a valid clock signal, it locks to frequencies within ±20% of its internal switching frequency (2.1MHz/400kHz/200kHz) in under two cycles. During loss of external clock, it automatically reverts to internal oscillator operation.
What protection features are integrated into the MAX25239AFFD/VY+?
The MAX25239AFFD/VY+ integrates undervoltage lockout (UVLO), overvoltage protection (OVP), cycle-by-cycle current limiting, thermal shutdown (175°C), hiccup-mode recovery, and open-drain PGOOD monitoring. These features eliminate the need for discrete protection components and ensure reliable operation in harsh automotive environments.
MAX25239AFFD/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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-FC2QFN (4.25x4.25)
MAX25239AFFD/VY+ FAQ
1.How can I place an order for MAX25239AFFD/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25239AFFD/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 MAX25239AFFD/VY+ reliable?
The price and inventory of MAX25239AFFD/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25239AFFD/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25239AFFD/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25239AFFD/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25239AFFD/VY+?
MAX25239AFFD/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25239AFFD/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 MAX25239AFFD/VY+?
For technical support, including MAX25239AFFD/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25239AFFD/VY+ requirements.
6.How does Aetrix verify that MAX25239AFFD/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25239AFFD/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 MAX25239AFFD/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25239AFFD/VY+?
All MAX25239AFFD/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25239AFFD/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 MAX25239AFFD/VY+ part is unused and in its original packaging.
Return procedure for MAX25239AFFD/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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