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Analog Devices Inc./Maxim Integrated MAX20403AFLE/VY+
- Part No.:
- MAX20403AFLE/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20403AFLE/VY+.pdf
- Description:
- IC REG BUCK ADJ 3.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:386
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Product details
Overview
MAX20403AFLE/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous Silent Switcher® buck converter delivering up to 2.5A across a 3V–36V input range, with adjustable output (0.8V–14V), 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for ADAS and radar power rails.
For engineers reviewing the MAX20403AFLE/VY+ datasheet, MAX20403AFLE/VY+ pinout, MAX20403AFLE/VY+ application, or MAX20403AFLE/VY+ equivalent, key selection criteria include its 2.1MHz operation enabling compact magnetics, 10μA no-load quiescent current in skip mode, 99% dropout duty cycle, ±1.5% output accuracy in FPWM mode, and FC2QFN-15 (3mm × 3mm) package with symmetrical EMI-optimized layout.
Technical Context
The MAX20403AFLE/VY+ implements average current-mode control with internal slope compensation, enabling stable operation down to 0.8V output while supporting 2.1MHz switching without external compensation. Its MAXQ® power architecture delivers precision transient response and high phase margin using only two external components: inductor and output capacitor.
It integrates high-side (95–165mΩ) and low-side (45–85mΩ) DMOS FETs, a 1.8V BIAS LDO, and a 2.5ms internal soft-start. Operation modes-skip (SYNC = low), forced-PWM (SYNC = high), or external sync-are selected via the SYNC pin, with spread spectrum enabled by pulling SPS high.
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 modules |
| Switching Frequency | 2.1MHz fixed - enables use of sub-2.2μH inductors and reduces EMI below AM band |
| Output Voltage Range | 0.8V to 14V adjustable - configured via external resistor divider on FB/OUT pin |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep states |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 5V out from 5.05V input) |
| PGOOD Accuracy | ±2.25% windowed threshold - provides reliable system-level power sequencing and fault detection |
Pinout & Package
MAX20403AFLE/VY+ uses a 15-pin FC2QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad, optimized for low-inductance, symmetrical PCB layout to suppress radiated EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-tolerant (up to 42V); active-high logic enables converter and internal BIAS LDO |
| SUP (pins 3,7) | High-side supply input | Power source for internal gate drivers; requires dual 0.1μF + 2.2μF ceramic bypass per pin |
| PGND (pins 4,6) | Power ground | Low-impedance return path for high di/dt switch currents; must be connected directly under IC |
| LX (pin 5) | Switch node | Connection to inductor; high dv/dt node requiring minimal trace area and tight coupling to PGND |
| BST (pin 9) | Bootstrap capacitor terminal | Connects 0.1μF ceramic cap to LX to generate high-side gate drive voltage |
| BIAS (pin 11) | Internal 1.8V LDO output | Powers analog circuitry; requires ≥2.2μF ceramic cap to PGND for stability |
| SPS (pin 12) | Spread-spectrum enable | Logic-high enables ±6% frequency dithering to reduce peak EMI emissions |
| FB/OUT (pin 13) | Feedback/sense input | Configurable as feedback node (adjustable VOUT) or output sense (fixed VOUT); references 0.8V internal reference |
| PGOOD (pin 14) | Open-drain power-good signal | Active-high flag indicating VOUT within ±2.25% window; requires external pull-up to BIAS or VOUT |
| SYNC (pin 15) | Mode control & sync input | Low = skip mode; high = FPWM; external clock input enables synchronization to system timing |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop, symmetrical pinout cancels magnetic fields to achieve CISPR 25 Class 5 compliance without shielding |
| MAXQ® power architecture | Guarantees >60° phase margin and <10μs transient recovery with minimal external components |
| Automotive robustness | AEC-Q100 Grade 1 (−40°C to +125°C), 42V load-dump tolerant, thermal shutdown at 175°C with 15°C hysteresis |
| Flexible output configuration | Supports both fixed-output (3.3V/5V) and adjustable (0.8V–14V) variants via same footprint and pinout |
| Ultra-low IQ operation | 10μA quiescent current in skip mode meets OEM requirements for >10-year battery drain limits in always-on modules |
Applications
| ADAS Camera Power Supply | Radar Transceiver Bias Rail |
|---|---|
Use Scenario: Powers image sensor, ISP, and serializer in 77GHz radar front-end camera fusion module. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V/3.3V buck regulator delivering clean, low-noise power with fast transient response to handle burst-mode imaging. Use Value: 2.1MHz switching avoids interference with radar IF bands; ±6% spread spectrum further reduces narrowband EMI peaks critical for FCC/CE certification. | Use Scenario: Supplies bias voltage to GaN MMICs and ADC/DAC chains in automotive corner radar units. IC Role / Device Role / Timing Role: High-efficiency, high-PSRR DC-DC stage converting 12V battery to 5V/3.3V with precise PGOOD signaling for system safety monitoring. Use Value: 99% duty cycle ensures uninterrupted operation during cold-crank (down to 3V input); AEC-Q100 qualification guarantees reliability over 15-year vehicle lifecycle. |
| Infotainment System Core Logic | Industrial CAN-FD Gateway |
Use Scenario: Generates core 1.1V CPU rail and I/O 3.3V rail for ARM-based infotainment head unit with display and audio codecs. IC Role / Device Role / Timing Role: Dual-output capable buck controller (with companion device) providing tightly regulated, low-ripple power under dynamic load steps. Use Value: 10μA skip-mode IQ enables <100μA system standby current; 2.5ms soft-start prevents inrush-induced brownouts during ignition-on sequencing. | Use Scenario: Powers isolated CAN-FD transceivers and microcontroller in heavy-duty vehicle telematics gateway operating from 24V chassis bus. IC Role / Device Role / Timing Role: Input-robust buck converter handling wide 9V–36V input range while maintaining stable 5V output for communication PHYs. Use Value: 42V transient tolerance eliminates need for upstream TVS; PGOOD signal feeds watchdog timer to detect undervoltage faults before CAN frame corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5V–36V input, 8A output, 2.1MHz, no spread spectrum, non-AEC-Q100 | Higher current, broader industrial temp range, lacks automotive qualification and EMI optimization | Preferred for non-automotive high-current designs where EMI is less constrained |
| TPS62933RTER | 3V–36V input, 3A output, 2.1MHz, ±10% spread spectrum, AEC-Q100 Grade 1 | Higher current rating, wider spread-spectrum range, but larger 4mm × 4mm QFN package | Selected when >2.5A load or enhanced EMI suppression is required, accepting larger board area |
Compared with LM61480RQWR and TPS62933RTER, the MAX20403AFLE/VY+ offers superior EMI performance due to its symmetrical FC2QFN layout and Silent Switcher® architecture, tighter output accuracy (±1.5% vs. ±2%), and smaller 3mm × 3mm footprint-making it optimal for space-constrained ADAS modules where CISPR 25 compliance is mandatory.
Availability
MAX20403AFLE/VY+ is available at Aetrix Electronics and suitable for automotive ADAS, radar subsystems, and industrial high-voltage DC-DC converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX20403AFLE/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 MAX20403AFLE/VY+ belongs to the MAX20402/MAX20403 family of automotive Silent Switcher® buck converters, designed specifically to replace discrete power stages in safety-critical ADAS and infotainment systems with ultra-low EMI, high efficiency, and AEC-Q100 reliability.
FAQ
What is the maximum output current capability of the MAX20403AFLE/VY+?
The MAX20403AFLE/VY+ delivers up to 2.5A continuous output current across its full operating temperature range (−40°C to +125°C). This rating is validated under typical thermal conditions using a 4-layer JEDEC board; actual achievable current depends on PCB layout, ambient temperature, and airflow. The device features overcurrent protection that limits peak inductor current to 4.375A–6.2A depending on variant, ensuring safe operation during short-circuit events.
Does the MAX20403AFLE/VY+ support adjustable output voltage, and how is it configured?
Yes, the MAX20403AFLE/VY+ supports adjustable output voltage from 0.8V to 14V. Configuration is achieved using an external resistor divider connected between VOUT, FB/OUT, and PGND. The internal feedback reference is 0.8V, so RFB1 = RFB2 × ((VOUT/0.8) − 1). RFB2 should be ≤50kΩ, and a feed-forward capacitor is recommended for stability. This flexibility allows the same MAX20403AFLE/VY+ to replace multiple fixed-output variants in BOM consolidation.
How does the MAX20403AFLE/VY+ achieve low EMI performance without external shielding?
The MAX20403AFLE/VY+ achieves low EMI through its patented Silent Switcher® architecture: a symmetrical FC2QFN-15 package with mirrored high- and low-side power loops cancels magnetic field emissions, while integrated spread-spectrum modulation (±6% at 2.1MHz) spreads energy across a wider bandwidth. Combined with optimized internal gate drive timing and low-inductance layout, this enables CISPR 25 Class 5 compliance in evaluation kits without ferrite beads or metal shields-reducing system cost and size.
What protection features are built into the MAX20403AFLE/VY+?
The MAX20403AFLE/VY+ integrates comprehensive protection: overcurrent (hiccup mode on sustained short), overvoltage (fast discharge via low-side FET), thermal shutdown (175°C trip with 15°C hysteresis), input UVLO (2.9V rising / 2.725V falling), and BIAS UVLO (1.63V). All protections are auto-recovering except thermal shutdown, which resets once junction temperature drops below 160°C. PGOOD provides system-level monitoring of output regulation integrity.
Is the MAX20403AFLE/VY+ pin-compatible with other devices in the MAX20402/MAX20403 family?
Yes, all MAX20402/MAX20403 variants-including MAX20403AFLE/VY+-share identical 15-pin FC2QFN-15 (3mm × 3mm) packaging and pinout. This enables drop-in replacement across output voltage (3.3V/5V/adjustable), current rating (2.5A/3.5A), and switching frequency (400kHz/2.1MHz/3MHz) options without PCB redesign. The only differences are internal configuration bits set during wafer test, making the MAX20403AFLE/VY+ ideal for design reuse and inventory simplification.
MAX20403AFLE/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFQFN
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for MAX20403AFLE/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20403AFLE/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 MAX20403AFLE/VY+ reliable?
The price and inventory of MAX20403AFLE/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20403AFLE/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20403AFLE/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20403AFLE/VY+?
MAX20403AFLE/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20403AFLE/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 MAX20403AFLE/VY+?
For technical support, including MAX20403AFLE/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20403AFLE/VY+ requirements.
6.How does Aetrix verify that MAX20403AFLE/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20403AFLE/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 MAX20403AFLE/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20403AFLE/VY+?
All MAX20403AFLE/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20403AFLE/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 MAX20403AFLE/VY+ part is unused and in its original packaging.
Return procedure for MAX20403AFLE/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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