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Analog Devices Inc./Maxim Integrated MAX20402AFLE/VY+
- Part No.:
- MAX20402AFLE/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLE/VY+.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:775
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Product details
Overview
MAX20402AFLE/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 2.5A over 3V–36V input range, featuring adjustable 0.8V–14V output, 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for radar and ADAS power rails.
For engineers reviewing the MAX20402AFLE/VY+ datasheet, MAX20402AFLE/VY+ pinout, MAX20402AFLE/VY+ application, or MAX20402AFLE/VY+ equivalent, this page delivers verified technical context, validated pin functions, confirmed EMI-reduction features, real-world automotive operating constraints (–40°C to +125°C, 42V load-dump tolerance), and precise selection guidance against comparable buck regulators.
Technical Context
The MAX20402AFLE/VY+ implements average current-mode control with internal slope compensation, enabling stable operation down to 1.5μH inductors at 2.1MHz and supporting dropout operation at 99% duty cycle. Its MAXQ® power architecture delivers ±1.5% output voltage accuracy in forced-PWM mode and accurate windowed PGOOD with 93% UV and 105% OV thresholds.
It integrates high-side (95–165mΩ) and low-side (45–85mΩ) DMOS FETs, a 1.8V BIAS LDO, and symmetrical FC2QFN package layout optimized for magnetic field cancellation. Spread-spectrum modulation operates at ±6% of fSW with 1.25ms period at 2.1MHz, and thermal shutdown activates at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 42V transient load-dump events - enables direct battery connection in 12V/24V automotive systems. |
| Output Current | Up to 2.5A continuous - supports power delivery for radar SoCs, camera ISPs, and domain controllers without external current boosting. |
| Switching Frequency | Fixed 2.1MHz - allows compact 1.5μH inductor and <25μF total output capacitance while avoiding AM band interference. |
| Output Voltage Range | Adjustable 0.8V to 14V via external resistor divider - supports core logic, I/O, and analog rail generation from single IC. |
| Quiescent Current | 10μA typical in skip mode - meets automotive cold-cranking and always-on system requirements with minimal battery drain. |
| EMI Performance | CISPR 25 Class 5-compliant with spread-spectrum enabled - eliminates need for external EMI filters in EV radar modules. |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis - ensures safe operation under sustained overload or poor heatsinking in engine bay environments. |
Pinout & Package
MAX20402AFLE/VY+ uses a 15-pin, 3mm × 3mm FC2QFN package with exposed thermal pad (F153B3FY+1), optimized for symmetrical current flow and low-inductance PCB layout. Pin 1 is EN; pins 2 & 8 are NC; pins 4 & 6 are PGND; pins 3 & 7 are SUP; pins 10 and 11 are GND and BIAS respectively; LX (pin 5), BST (pin 9), FB/OUT (pin 13), PGOOD (pin 14), SYNC (pin 15), and SPS (pin 12) complete the interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | High-voltage enable input | Active-high logic compatible with 3V–42V automotive battery; enables internal BIAS LDO and converter startup when >0.9V. |
| SUP (Pins 3,7) | High-side supply input | Dual-supply inputs for balanced input capacitor placement; each requires 0.1μF + 2.2μF ceramic bypass to PGND for low-impedance path. |
| PGND (Pins 4,6) | Power ground return | Low-impedance return for high-current switching paths; must be connected directly under IC footprint with multiple vias to internal ground plane. |
| LX (Pin 5) | Switch node | Connects to inductor switch node; requires minimal trace area to reduce dv/dt noise and EMI radiation. |
| BST (Pin 9) | Bootstrap capacitor terminal | Connects 0.1μF ceramic capacitor to LX; critical for high-side gate drive; short wide trace required to minimize loop inductance. |
| BIAS (Pin 11) | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic capacitor to PGND placed adjacent to pin to stabilize regulation and suppress noise. |
| FB/OUT (Pin 13) | Feedback/sense input | Configured as feedback node for adjustable output; connects to resistor divider between VOUT and AGND to set 0.8V–14V output. |
| PGOOD (Pin 14) | Open-drain power-good signal | Asserts high when VOUT is within 93–105% of target; requires external 20kΩ pull-up to BIAS or VOUT for system sequencing. |
| SYNC (Pin 15) | Mode control & sync input | Pulled low for skip mode, high for FPWM, or driven with external clock (1.7–2.6MHz) for synchronization to system timing source. |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high enables ±6% triangular frequency modulation; disabled automatically during external clock sync to avoid conflict. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Symmetrical FC2QFN pinout cancels magnetic fields, reducing radiated EMI by >20dB vs conventional buck layouts. |
| MAXQ® power architecture | Delivers precision transient response and phase margin stability without external compensation components. |
| 99% duty-cycle dropout operation | Enables regulation down to VIN – 0.3V, critical for cold-crank scenarios where battery drops to 3.2V while powering 3.3V rails. |
| AEC-Q100 Grade-1 qualification | Rated for –40°C to +125°C ambient operation with full electrical performance guaranteed across temperature and lifetime. |
| Integrated protection suite | Includes overcurrent hiccup mode, overvoltage fast discharge, thermal shutdown with hysteresis, and input UVLO with 300mV hysteresis. |
Applications
| Radar Module Power Supply | ADAS Domain Controller Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoC requiring clean, low-noise 1.2V/1.8V core and 3.3V I/O rails in front-bumper mounting location. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 12V battery to regulated low-voltage rails with ultra-low EMI to prevent RF interference with radar chirp signals. Use Value: CISPR 25 Class 5 compliance eliminates need for ferrite beads or metal shielding, reducing BOM cost and board area by >30%. | Use Scenario: Supplies configurable 0.8V–1.2V core voltage to AI accelerator ASIC in zonal ECU, dynamically adjusted via I²C-controlled DAC on FB pin. IC Role / Device Role / Timing Role: Adjustable-output buck converter with precision soft-start (2.5ms) and PGOOD sequencing for multi-rail power-up coordination. Use Value: ±1.5% output accuracy in FPWM mode ensures stable operation across temperature and load, preventing timing violations in high-speed SerDes interfaces. |
| Automotive Infotainment Display Backlight | Camera ISP Power Management |
Use Scenario: Generates 5V rail for LED driver IC powering LCD backlight in center-stack display, operating continuously during vehicle ignition-off "keep-alive" mode. IC Role / Device Role / Timing Role: High-efficiency buck converter leveraging 10μA skip-mode quiescent current to extend battery life during extended parking periods. Use Value: Ultra-low IQ enables >14-day battery hold-up time without deep-discharge risk, meeting OEM requirements for infotainment memory retention. | Use Scenario: Provides 2.8V and 1.2V rails to image signal processor and sensor interface in rear-view camera module exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Dual-rail solution using single MAX20402AFLE/VY+ with external divider plus post-regulator, qualified for 125°C junction operation. Use Value: 42V load-dump tolerance and –40°C to +125°C operation ensure uninterrupted video streaming during jump-starts and extreme ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 4.5V–36V input, 8A output, 2.1MHz, no spread spectrum, larger 4mm × 4mm QFN | Higher current capability but higher EMI; lacks CISPR 25 Class 5 validation out-of-box | Select when >2.5A load or lower cost is prioritized over EMI certification and footprint size. |
| TPS62933RTERQ1 | 3V–36V input, 3.5A output, 2.2MHz, integrated spread spectrum, 2.5mm × 3mm QFN | Higher current rating and smaller footprint, but only ±2% spread-spectrum depth vs ±6% in MAX20402AFLE/VY+ | Select when space-constrained layout demands smallest possible package and 3.5A headroom is needed for future-proofing. |
Compared with LM61480QRNXTQ1 and TPS62933RTERQ1, the MAX20402AFLE/VY+ uniquely combines AEC-Q100 Grade-1 qualification, ±6% spread-spectrum depth, symmetrical EMI-optimized pinout, and 3mm × 3mm FC2QFN in a 2.5A solution-making it optimal for safety-critical radar and camera power where EMI margin and thermal reliability are non-negotiable.
Availability
MAX20402AFLE/VY+ is available at Aetrix Electronics and suitable for automotive radar modules, ADAS domain controllers, infotainment displays, and camera systems requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for MAX20402AFLE/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 MAX20402/MAX20403 product line was designed specifically for automotive power conversion in safety-critical ADAS subsystems, emphasizing ultra-low EMI, high thermal robustness, and seamless integration into compact, high-density ECUs.
FAQ
What is the maximum output voltage range supported by the MAX20402AFLE/VY+?
The MAX20402AFLE/VY+ supports an adjustable output voltage range of 0.8V to 14V, set via an external resistor divider connected to the FB/OUT pin. This range is confirmed in the Electrical Characteristics table and Typical Application Circuits section of the datasheet, with feedback voltage accuracy specified at ±1.5% in forced-PWM mode. The MAX20402AFLE/VY+ does not support fixed 5V or 3.3V outputs - those variants use different part numbers (e.g., MAX20402AFLA/VY+).
Does the MAX20402AFLE/VY+ require external compensation components?
No, the MAX20402AFLE/VY+ does not require external compensation components. Its MAXQ® power architecture provides internally optimized phase margin and transient response across the full 0.8V–14V output range and recommended output capacitance values (e.g., 23μF effective COUT at 2.1MHz). Compensation is factory-trimmed and validated per the datasheet's stability guidelines, eliminating design iteration for loop tuning.
How does the spread-spectrum feature operate on the MAX20402AFLE/VY+?
The MAX20402AFLE/VY+ enables spread-spectrum modulation via the SPS pin: logic-high activates ±6% triangular frequency deviation around the nominal 2.1MHz switching frequency, with a 1.25ms modulation period. This feature is automatically disabled when SYNC is driven by an external clock to prevent interference. The modulation reduces peak EMI emissions by spreading energy across a wider bandwidth, contributing to CISPR 25 Class 5 compliance without added filtering.
What is the thermal performance of the MAX20402AFLE/VY+ in a standard 4-layer PCB layout?
In a standard 4-layer JEDEC board, the MAX20402AFLE/VY+ has a junction-to-ambient thermal resistance (θJA) of 51.1°C/W and junction-to-board (θJB) of 23.3°C/W. When mounted on the official Analog Devices evaluation kit (4-layer EV kit), θJA improves to 40.6°C/W and θJB to 11.7°C/W. These values are measured per JEDEC standards and confirm the device can sustain 2.5A continuous output at +85°C ambient with appropriate copper pour and via stitching under the thermal pad.
Is the MAX20402AFLE/VY+ pin-compatible with other members of the MAX20402/MAX20403 family?
Yes, the MAX20402AFLE/VY+ is pin-compatible with all MAX20402 and MAX20403 variants, including MAX20402AFLA/VY+, MAX20402AFLB/VY+, and MAX20403AFLE/VY+. All share identical 15-pin FC2QFN (3mm × 3mm) package, pinout, and footprint (land pattern 90-100188). Functional differences - such as fixed vs. adjustable output, current rating (2.5A vs. 3.5A), and switching frequency - are implemented internally and do not affect mechanical or electrical connectivity.
MAX20402AFLE/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:
- 2.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 15-FC2QFN (3x3)
MAX20402AFLE/VY+ FAQ
1.How can I place an order for MAX20402AFLE/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLE/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 MAX20402AFLE/VY+ reliable?
The price and inventory of MAX20402AFLE/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20402AFLE/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20402AFLE/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLE/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLE/VY+?
MAX20402AFLE/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLE/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 MAX20402AFLE/VY+?
For technical support, including MAX20402AFLE/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLE/VY+ requirements.
6.How does Aetrix verify that MAX20402AFLE/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLE/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 MAX20402AFLE/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20402AFLE/VY+?
All MAX20402AFLE/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLE/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 MAX20402AFLE/VY+ part is unused and in its original packaging.
Return procedure for MAX20402AFLE/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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