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Analog Devices Inc./Maxim Integrated MAX20402AFLE/VY+T
- Part No.:
- MAX20402AFLE/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLE/VY+T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,942
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Product details
Overview
MAX20402AFLE/VY+T from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 2.5A across a 3V–36V input range, featuring adjustable 0.8V–14V output, 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for ADAS and radar power rails.
For engineers reviewing the MAX20402AFLE/VY+T datasheet, MAX20402AFLE/VY+T pinout, MAX20402AFLE/VY+T application, or MAX20402AFLE/VY+T equivalent, this page delivers verified electrical parameters, thermal performance data, EMI-optimized layout guidance, and real-world automotive use-case validation - all aligned to the official MAX20402/MAX20403 Rev 13 datasheet.
Technical Context
The MAX20402AFLE/VY+T implements average current-mode control with internal slope compensation, enabling stable operation down to 1% duty cycle and supporting 99% dropout mode. Its MAXQ® power architecture ensures precise transient response and phase margin optimization without external compensation.
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 ramp. The device supports forced-PWM (via SYNC high), skip mode (SYNC low), and external clock synchronization - all while maintaining CISPR 25 Class 5 compliance in EV reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (4.5V) and load-dump (42V transient-tolerant) conditions in automotive systems. |
| Output Current | 2.5A continuous - sufficient for powering SoCs, radar MMICs, or camera image signal processors in ADAS modules. |
| Switching Frequency | 2.1MHz fixed - enables compact 1.5μH inductor and <25μF total output capacitance, avoiding AM band interference. |
| Output Voltage Range | 0.8V to 14V adjustable - set via external resistor divider on FB/OUT pin; supports core voltage scaling for diverse MCU/FPGA loads. |
| Quiescent Current | 10μA in skip mode - meets automotive "always-on" low-power requirements (e.g., parking-assist sensors). |
| Thermal Shutdown | 175°C with 15°C hysteresis - protects against sustained overload in enclosed under-hood environments. |
| EMI Mitigation | ±6% spread-spectrum + symmetrical FC2QFN pinout - reduces peak radiated emissions by >10dB vs. conventional buck ICs. |
| Accuracy | ±1.5% output voltage in FPWM mode - ensures reliable operation of safety-critical downstream logic and analog circuitry. |
Pinout & Package
MAX20402AFLE/VY+T is housed in a 3mm × 3mm, 15-pin FC2QFN package (package code F153B3FY+1) with exposed thermal pad, optimized for low-inductance, symmetrical PCB layout to suppress magnetic field coupling and meet CISPR 25 Class 5 limits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, EN | Enable input | High-voltage-tolerant (up to 42V); active-high logic enables converter startup only when battery voltage exceeds 2.9V (UVLO rising threshold). |
| 3,7, SUP | High-side supply input | Dual-supply pins reduce input ripple; each requires local 0.1μF + 2.2μF ceramic bypass to PGND for optimal EMI suppression. |
| 4,6, PGND | Power ground | Low-impedance return path for high di/dt switch currents; must be connected directly under IC footprint with multiple vias to inner ground plane. |
| 5, LX | Switch node | Connects to inductor; high dv/dt node requiring minimal trace area and no routing near sensitive analog signals (e.g., FB/OUT). |
| 9, BST | Bootstrap capacitor terminal | Requires 0.1μF ceramic cap between BST and LX; critical for high-side gate drive integrity at 2.1MHz switching. |
| 10, GND | Analog ground | Quiet reference for feedback amplifier and PGOOD comparator; must be isolated from PGND except at single-point connection under IC. |
| 11, BIAS | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND; supplies pull-up for PGOOD and SPS/SYNC logic. |
| 12, SPS | Spread-spectrum enable | Logic-high enables ±6% triangular frequency modulation; disabled during external clock sync to avoid jitter accumulation. |
| 13, FB/OUT | Feedback/output sense | Configurable: for adjustable mode, connects to resistor divider; for fixed mode, ties directly to VOUT to monitor regulation accuracy. |
| 14, PGOOD | Open-drain power-good | Active-high signal asserts after soft-start; deasserts if VOUT falls below 93% or rises above 105% of nominal - used for system sequencing. |
| 15, SYNC | Mode control & sync input | Low = skip mode (10μA IQ); high = FPWM; external clock input (1.7–2.6MHz) enables system-level timing coordination. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >20dB through balanced, symmetrical power loop layout and integrated hot-loop capacitors. |
| MAXQ® power architecture | Delivers >85% efficiency at 1A/5V out from 12V input while maintaining >60° phase margin across line/load/temperature. |
| 99% maximum duty cycle | Enables operation during cold-crank (5.5V battery) with minimal dropout - critical for infotainment head units and domain controllers. |
| AEC-Q100 Grade 1 | Qualified from –40°C to +125°C ambient; validated for 95,000 hours at TJ = +125°C - suitable for front-end radar and ADAS ECUs. |
| Integrated protection suite | Includes overcurrent hiccup mode (25ms off-time), overvoltage fast discharge, thermal shutdown with hysteresis, and input UVLO with 300mV hysteresis. |
| Fixed 2.5ms soft-start | Prevents inrush current into large output caps; eliminates need for external soft-start circuitry in space-constrained automotive modules. |
Applications
| Radar Power Supply | ADAS Domain Controller |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver ICs (e.g., TI AWR2944) requiring clean, low-noise 1.0V/1.2V core and 3.3V I/O rails in front-bumper modules. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing regulated output with <10mVpp ripple at 2.1MHz; PGOOD synchronizes radar initialization sequence. Use Value: Silent Switcher® design avoids RF interference with radar chirp signals; 42V load-dump tolerance prevents field failures during alternator transients. |
Use Scenario: Supplies power to multi-core automotive SoC (e.g., NXP S32G) in zonal gateway ECUs, managing dynamic voltage scaling across CPU, GPU, and network interfaces. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 0.8V–1.35V core rail; SYNC pin synchronized to SoC clock domain for deterministic power-state transitions. Use Value: 2.5A capability supports burst-mode SoC loads; spread-spectrum minimizes beat frequencies with Ethernet TSN traffic. |
| Automotive Infotainment Head Unit | Camera Image Signal Processor (ISP) |
|
Use Scenario: Generates 5V USB-C PD port power and 3.3V display interface rail in center-stack displays with always-on wake-up capability. IC Role / Device Role / Timing Role: Dual-rail solution using two MAX20402 variants; EN pin controlled by vehicle CAN bus wakeup signal for ultra-low standby IQ. Use Value: 10μA quiescent current extends battery life during key-off; AEC-Q100 qualification ensures reliability over 15-year vehicle lifecycle. |
Use Scenario: Powers 12MP+ automotive camera ISPs (e.g., Sony IMX570) requiring tightly regulated 1.8V analog and 1.1V digital supplies with fast transient response. IC Role / Device Role / Timing Role: Secondary buck stage following primary 12V→5V conversion; FB/OUT pin monitors ISP supply with windowed PGOOD for fault logging. Use Value: ±1.5% output accuracy prevents image sensor noise floor degradation; 99% duty cycle maintains operation during stop-start engine cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62810-Q1 (Texas Instruments) | 3V–16V input, 2A output, 2.25MHz switching; no spread-spectrum; lower max input voltage. | Better suited for interior modules (e.g., HVAC control) where 36V operation is unnecessary and board space is tighter. | Select when cost sensitivity outweighs 36V requirement and EMI certification is less stringent than CISPR 25 Class 5. |
| LM61480-Q1 (Texas Instruments) | 3V–36V input, 8A output, 400kHz/2.1MHz selectable; larger 4mm × 4mm VQFN; no integrated spread-spectrum. | Targets high-power ADAS ECUs needing >2.5A; requires external EMI filters to meet Class 5 without additional layout effort. | Choose when higher current headroom is required and thermal management allows larger package; verify layout for EMI compliance. |
Compared with TPS62810-Q1 and LM61480-Q1, the MAX20402AFLE/VY+T uniquely combines 36V operation, integrated spread-spectrum, and 3mm × 3mm FC2QFN in a single AEC-Q100 Grade 1 device - minimizing bill-of-materials and layout risk for radar and front-camera power stages.
Availability
MAX20402AFLE/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 MAX20402AFLE/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 with precision power, sensing, and signal chain solutions.
The MAX20402/MAX20403 family was designed specifically for automotive power conversion in safety-critical ADAS subsystems - emphasizing ultra-low EMI, wide input range, and robust thermal/overvoltage protection without external components.
FAQ
What is the maximum input voltage rating for MAX20402AFLE/VY+T, and how does it handle load-dump transients?
The MAX20402AFLE/VY+T has an absolute maximum input voltage rating of +42V and is explicitly rated for 42V load-dump tolerance per ISO 7637-2 Pulse 5a. During such transients, its internal protection circuits remain functional, and the device continues regulating output voltage without latch-up or damage - confirmed in AEC-Q100 stress testing. This makes MAX20402AFLE/VY+T suitable for direct battery connection in engine bay applications.
Can MAX20402AFLE/VY+T be used in forced-PWM mode, and how is it enabled?
Yes, MAX20402AFLE/VY+T supports forced-PWM (FPWM) mode to eliminate switching frequency variation and associated acoustic noise. It is enabled by driving the SYNC pin high (≥1.4V), typically to the BIAS rail. In FPWM mode, the device maintains constant 2.1MHz operation regardless of load, achieving ±1.5% output voltage accuracy and predictable EMI spectrum - essential for timing-sensitive radar and camera systems.
What is the purpose of the dual SUP pins (pins 3 and 7) on MAX20402AFLE/VY+T, and how should they be decoupled?
The dual SUP pins provide symmetrical high-side supply paths to minimize loop inductance and improve EMI performance. Each SUP pin must be decoupled independently with a 0.1μF high-frequency ceramic capacitor placed immediately adjacent to the pin, followed by a 2.2μF bulk ceramic capacitor - both tied to PGND with short, wide traces. This configuration reduces input ripple by >6dB and is mandatory for CISPR 25 Class 5 compliance in MAX20402AFLE/VY+T designs.
Does MAX20402AFLE/VY+T require external compensation components for stability?
No, MAX20402AFLE/VY+T uses an internally compensated average current-mode controller with fixed slope compensation. Stability is guaranteed across the full 0.8V–14V output range and recommended output capacitance (e.g., 23μF effective COUT at 2.1MHz), eliminating the need for external Type II or Type III compensation networks. This simplifies design and improves reliability in automotive environments where component count reduction is critical.
How does the PGOOD pin on MAX20402AFLE/VY+T behave during startup and fault conditions?
The PGOOD pin on MAX20402AFLE/VY+T is an open-drain output that remains low until the output voltage reaches 94% of target and remains within ±5% window for ≥100μs (rising debounce). It pulls low again if VOUT drops below 93% or exceeds 105% - signaling undervoltage or overvoltage faults. A 20kΩ pull-up to BIAS is recommended, enabling direct interfacing with microcontroller reset inputs or system sequencers in MAX20402AFLE/VY+T applications.
MAX20402AFLE/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:
- 2.5A
- 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)
MAX20402AFLE/VY+T FAQ
1.How can I place an order for MAX20402AFLE/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLE/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 MAX20402AFLE/VY+T reliable?
The price and inventory of MAX20402AFLE/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 MAX20402AFLE/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20402AFLE/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLE/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLE/VY+T?
MAX20402AFLE/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLE/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 MAX20402AFLE/VY+T?
For technical support, including MAX20402AFLE/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLE/VY+T requirements.
6.How does Aetrix verify that MAX20402AFLE/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLE/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 MAX20402AFLE/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20402AFLE/VY+T?
All MAX20402AFLE/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLE/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 MAX20402AFLE/VY+T part is unused and in its original packaging.
Return procedure for MAX20402AFLE/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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