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Analog Devices Inc./Maxim Integrated MAX20403AFLE/VY+T
- Part No.:
- MAX20403AFLE/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20403AFLE/VY+T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
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Product details
Overview
MAX20403AFLE/VY+T from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 2.5A continuous output current across a 3V–36V input range. It features a fixed 2.1MHz switching frequency, ±6% spread-spectrum modulation, 10μA no-load quiescent current in skip mode, and AEC-Q100 qualification for use in ADAS radar modules and infotainment power rails.
For engineers reviewing the MAX20403AFLE/VY+T datasheet, MAX20403AFLE/VY+T pinout, MAX20403AFLE/VY+T application, or MAX20403AFLE/VY+T equivalent, key selection criteria include its adjustable 0.8V–14V output voltage, 99% dropout duty cycle, 3mm × 3mm FC2QFN package, and integrated high-side/low-side MOSFETs with 95mΩ/45mΩ typical RDS(ON).
Technical Context
The MAX20403AFLE/VY+T implements average current-mode control with MAXQ® power architecture for precision transient response and stable phase margin. Its internal 2.1MHz oscillator supports external synchronization via SYNC pin and enables forced-PWM or automatic skip-mode operation based on logic level.
It integrates a 1.8V BIAS LDO, PGOOD monitoring with ±2.25% windowed thresholds, thermal shutdown at 175°C (15°C hysteresis), and overvoltage/short-circuit protection with hiccup-mode recovery - all within a symmetrical FC2QFN footprint optimized for CISPR 25 Class 5 EMI compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and load-dump (42V transient) conditions in automotive systems |
| Output Current | 2.5A continuous - sufficient for powering SoCs, sensors, and interface ICs in ADAS subsystems |
| Switching Frequency | 2.1MHz fixed - enables compact magnetics and avoids AM radio band interference |
| Output Voltage Range | Adjustable 0.8V to 14V - configured via external resistor divider on FB/OUT pin |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep modes |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures robust operation under sustained high-temperature conditions |
| EMI Mitigation | ±6% spread-spectrum modulation + symmetrical FC2QFN layout - meets CISPR 25 Class 5 radiated emissions limits without shielding |
Pinout & Package
Package: 15-pin FC2QFN, 3mm × 3mm, 0.5mm pitch, exposed thermal pad (PGND-connected). Symmetrical pin arrangement minimizes magnetic field coupling and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Active-high logic; compatible with 3V–36V automotive battery rail; controls startup sequence and shutdown current (2.75μA typ) |
| SUP (Pins 3,7) | Internal high-side supply input | Power source for gate drivers and internal circuitry; requires dual bypass capacitors (0.1μF + 2.2μF) per pin |
| PGND (Pins 4,6) | Power ground return | Low-impedance path for high-current switching loops; must be connected directly to thermal pad |
| LX (Pin 5) | Switch node | Connection to inductor; carries full switching current and high dv/dt; requires minimal trace area |
| BST (Pin 9) | Bootstrap capacitor terminal | Drives high-side FET gate; requires 0.1μF ceramic capacitor between BST and LX |
| BIAS (Pin 11) | 1.8V internal LDO output | Powers analog blocks; requires ≥2.2μF ceramic capacitor to PGND for stability |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high activates ±6% frequency dithering to reduce peak EMI emissions |
| FB/OUT (Pin 13) | Feedback or output sense | Configurable as voltage feedback (adjustable mode) or output monitor (fixed mode); 0.8V reference with ±1.5% accuracy |
| PGOOD (Pin 14) | Open-drain power-good signal | Indicates VOUT within ±2.25% window; requires external pull-up to BIAS or system rail |
| SYNC (Pin 15) | Mode control & sync input | Low = skip mode; high = forced PWM; external clock input enables synchronization to master timing source |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop layout symmetry reduces common-mode EMI by >30dB vs conventional buck converters |
| MAXQ® power architecture | Guarantees ≥60° phase margin across temperature and load, enabling stable regulation with minimal output capacitance |
| 99% maximum duty cycle | Enables operation down to 3.03V input at 5V output - critical for automotive cold-crank scenarios |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and upstream fuses during power-up |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation - suitable for engine bay and front-end ADAS placement |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a transients without external TVS clamping |
Applications
| Radar Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ICs requiring clean, low-noise 1.2V/1.8V/3.3V rails in compact front-bumper modules. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 12V battery to multiple low-voltage domains with tight ripple (<10mVpp) and fast transient response. Use Value: Silent Switcher® EMI suppression eliminates need for ferrite beads or metal shields, reducing BOM cost and board area by >25%. | Use Scenario: Supplies image sensor and ISP in surround-view camera systems exposed to wide temperature swings and vibration. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter delivering 2.5A at 1.2V with <10μA quiescent current during vehicle sleep mode. Use Value: 99% duty cycle maintains regulation during cold-crank (3V battery), preventing camera blackout during engine start. |
| Infotainment Head Unit | Automotive Gateway MCU |
Use Scenario: Generates 5V and 3.3V rails for audio DSPs, touch controllers, and display interfaces in center-stack head units. IC Role / Device Role / Timing Role: Dual-output capable (with external divider) buck regulator supporting dynamic voltage scaling and brownout detection via PGOOD. Use Value: ±1.5% output accuracy and windowed PGOOD ensure reliable boot sequencing and safe shutdown during battery fluctuations. | Use Scenario: Powers ARM Cortex-M7-based gateway MCUs managing CAN FD, Ethernet AVB, and LIN communication stacks. IC Role / Device Role / Timing Role: Primary 3.3V supply with forced-PWM mode enabled via SYNC pin to eliminate audible noise during CAN bus arbitration. Use Value: Spread-spectrum modulation reduces radiated emissions below CISPR 25 Class 5 limits without compromising switching frequency stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRHFRQ1 | 4.5V–36V input, 8A output, 2.1MHz, no spread spectrum, larger 16-pin WQFN (4mm × 4mm) | Higher current capability but lacks EMI-optimized layout and Silent Switcher® integration | Select when >2.5A load current or higher thermal margin is required; not drop-in due to different pinout and layout constraints |
| TPS62933RTER | 3V–36V input, 3.5A output, 2.2MHz, integrated spread spectrum, smaller 12-pin VQFN (2mm × 3mm) | Lower RDS(ON) (32mΩ/15mΩ), but not AEC-Q100 qualified and lacks 42V load-dump tolerance | Consider for non-automotive industrial applications where qualification and transient robustness are less critical |
Compared with LM61480QRHFRQ1 and TPS62933RTER, the MAX20403AFLE/VY+T uniquely combines AEC-Q100 Grade 1 qualification, 42V load-dump tolerance, symmetrical EMI-optimized FC2QFN packaging, and guaranteed CISPR 25 Class 5 compliance - making it the preferred choice for space-constrained, safety-critical automotive power rails.
Availability
MAX20403AFLE/VY+T is available at Aetrix Electronics and suitable for automotive ADAS systems, radar modules, and infotainment head units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX20403AFLE/VY+T 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 technologies, serving automotive, industrial, communications, and healthcare markets.
The MAX20403 belongs to Analog Devices' automotive Silent Switcher® power portfolio, designed specifically for EMI-sensitive ADAS and infotainment applications where compact size, ultra-low emissions, and AEC-Q100 reliability are mandatory.
FAQ
What output voltage range does the MAX20403AFLE/VY+T support?
The MAX20403AFLE/VY+T supports an adjustable output voltage range of 0.8V to 14V, set using an external resistor divider on the FB/OUT pin. Unlike fixed-output variants (e.g., MAX20403AFLA/VY+ for 5V), this version provides design flexibility for custom rail generation in automotive subsystems while maintaining ±1.5% output accuracy in forced-PWM mode.
How does the MAX20403AFLE/VY+T achieve CISPR 25 Class 5 compliance?
The MAX20403AFLE/VY+T achieves CISPR 25 Class 5 compliance through three integrated features: Silent Switcher® symmetrical FC2QFN layout that cancels magnetic fields, ±6% spread-spectrum modulation to lower peak EMI, and optimized internal current-mode control that minimizes switching noise. No external EMI filters or metal shielding are required in typical EV kit configurations.
Can the MAX20403AFLE/VY+T operate during automotive cold-crank conditions?
Yes, the MAX20403AFLE/VY+T operates reliably during cold-crank conditions with input voltages as low as 3V, thanks to its 99% maximum duty cycle capability. This ensures uninterrupted power delivery to critical ADAS components even when battery voltage dips below 6V during engine cranking - a requirement validated under AEC-Q100 Grade 1 temperature cycling.
What is the purpose of the SPS pin on the MAX20403AFLE/VY+T?
The SPS (Spread Spectrum) pin on the MAX20403AFLE/VY+T enables or disables ±6% frequency dithering of the internal 2.1MHz oscillator. When pulled high, it activates spread-spectrum modulation to reduce radiated EMI peaks; when pulled low or left floating (with internal pull-down), it disables dithering for deterministic timing in noise-sensitive applications like radar clocking.
Does the MAX20403AFLE/VY+T include thermal protection?
Yes, the MAX20403AFLE/VY+T includes integrated thermal shutdown protection that disables the converter when junction temperature exceeds 175°C, with 15°C hysteresis to prevent oscillation. The device resumes normal operation only after cooling below 160°C. This protection is fully qualified per AEC-Q100 and verified across the -40°C to +125°C ambient operating range.
MAX20403AFLE/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 15-FC2QFN (3x3)
MAX20403AFLE/VY+T FAQ
1.How can I place an order for MAX20403AFLE/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20403AFLE/VY+T 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 MAX20403AFLE/VY+T reliable?
The price and inventory of MAX20403AFLE/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20403AFLE/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20403AFLE/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20403AFLE/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20403AFLE/VY+T?
MAX20403AFLE/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20403AFLE/VY+T 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 MAX20403AFLE/VY+T?
For technical support, including MAX20403AFLE/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20403AFLE/VY+T requirements.
6.How does Aetrix verify that MAX20403AFLE/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20403AFLE/VY+T 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 MAX20403AFLE/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20403AFLE/VY+T?
All MAX20403AFLE/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20403AFLE/VY+T, 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 MAX20403AFLE/VY+T part is unused and in its original packaging.
Return procedure for MAX20403AFLE/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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