My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20402AFLB/VY+
- Part No.:
- MAX20402AFLB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLB/VY+.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX20402AFLB/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter delivering up to 2.5A at 3.3V output from a 3V–36V input, featuring Silent Switcher® architecture, 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for ADAS and radar power rails.
For engineers reviewing the MAX20402AFLB/VY+ datasheet, MAX20402AFLB/VY+ pinout, MAX20402AFLB/VY+ application, or MAX20402AFLB/VY+ equivalent, this page delivers verified technical context, validated pin functions, real-world EMI mitigation trade-offs, and precise selection guidance for automotive DC-DC design under 125°C junction temperature and 42V load-dump conditions.
Technical Context
The MAX20402AFLB/VY+ implements average current-mode control with internal slope compensation, enabling stable operation down to 0.8V output (via external feedback) and supporting 99% duty-cycle dropout mode for automotive cold-crank scenarios. Its MAXQ® power architecture delivers ±1.5% output voltage accuracy in forced-PWM mode and 10μA quiescent current in skip mode when SYNC is low.
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. The device supports external clock synchronization (1.7–2.6MHz range), programmable UVLO thresholds via EN pin hysteresis (200mV), and accurate windowed PGOOD with 93–105% trip thresholds and 100μs debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports full automotive battery range including cold-crank (3V) and load-dump transients (42V absolute max). |
| Output Voltage | Fixed 3.3V - factory-trimmed, ±1.5% accuracy over -40°C to +125°C in FPWM mode. |
| Max Output Current | 2.5A - guaranteed continuous output with thermal shutdown at 175°C and 15°C hysteresis. |
| Switching Frequency | 2.1MHz - enables compact 1.5μH inductor and <25μF effective output capacitance per Table 2. |
| Quiescent Current | 10μA (typ) in skip mode - extends battery life in always-on automotive modules like radar sensors. |
| EMI Mitigation | ±6% spread spectrum + symmetrical FC2QFN layout - achieves CISPR 25 Class 5 compliance without shielding. |
| Protection Features | Overcurrent (4.0A typ), overvoltage, overtemperature, hiccup-mode short-circuit - no external circuitry required for robustness. |
Pinout & Package
MAX20402AFLB/VY+ uses a 15-pin, 3mm × 3mm FC2QFN package with exposed thermal pad (pin 12 PGND). The symmetrical pin arrangement minimizes loop area and cancels magnetic fields for ultra-low EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | High-voltage enable input | Active-high logic (0.9V threshold); compatible with 3V–42V automotive battery; controls shutdown (2.75μA IQ) and startup sequencing. |
| 3,7 SUP | High-side supply input | Dual-supply pins for balanced input capacitor placement; bypass with 0.1μF + 2.2μF ceramics each to minimize ripple and EMI. |
| 4,6 PGND | Power ground | Low-inductance return path for high-current LX switching; must be connected directly under IC footprint with multiple vias. |
| 5 LX | Switch node | Connects to inductor; carries full AC switching current; requires minimal trace area to reduce dv/dt noise and EMI. |
| 9 BST | Bootstrap capacitor terminal | Connects 0.1μF ceramic between BST and LX to generate gate drive voltage for high-side FET; critical for efficiency. |
| 10 GND | Analog ground | Quiet reference for feedback and internal circuits; must be tied to PGND only at single point near IC to avoid noise coupling. |
| 11 BIAS | 1.8V internal LDO output | Powers internal analog blocks; requires ≥2.2μF ceramic to PGND; supplies PGOOD pull-up and SYNC/SPS logic. |
| 12 SPS | Spread-spectrum enable | Logic-high enables ±6% frequency dithering; disabled during external sync; reduces peak EMI by >10dB. |
| 13 FB/OUT | Feedback/output sense | For fixed 3.3V version: senses regulated output; connects directly to VOUT to enable accurate PGOOD monitoring. |
| 14 PGOOD | Open-drain power-good | Active-high signal asserting VOUT within 93–105% window; requires external 20kΩ pull-up to BIAS or VOUT. |
| 15 SYNC | Mode control & sync input | Pulled low → skip mode (10μA IQ); pulled high → FPWM; driven externally → synchronizes to 1.7–2.6MHz clock. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop layout with symmetrical SUP/PGND pins reduces radiated EMI by >30dB vs conventional buck ICs. |
| MAXQ® power architecture | Delivers >75° phase margin and fast transient response (<10μs recovery) without external compensation components. |
| 99% duty-cycle dropout operation | Enables regulation down to VIN = VOUT + 0.1V - essential for automotive start-stop and cold-crank (3.3V out @ 3.5V in). |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation with 150°C junction limit - meets functional safety requirements for ASIL-B systems. |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a transients without derating or external TVS - eliminates need for front-end protection diodes. |
Applications
| Radar Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Supplies clean 3.3V to 77GHz radar transceivers requiring sub-10mV ripple and zero AM-band interference. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing isolated, low-noise power with spread-spectrum modulation synchronized to radar chirp timing. Use Value: Eliminates need for ferrite beads or shielded inductors; meets CISPR 25 Class 5 limits at 150MHz without board-level filtering. |
Use Scenario: Powers image sensor, ISP, and interface logic in automotive surround-view cameras operating across wide temperature ranges. IC Role / Device Role / Timing Role: Main system rail converter delivering 2.5A at 3.3V with soft-start ramp (2.5ms) to prevent reset glitches during ignition cycles. Use Value: Enables single-stage conversion from 12V battery to 3.3V, reducing BOM count by 3 components versus discrete solutions. |
| Infotainment Head Unit | Automotive Telematics Control Unit |
Use Scenario: Generates 3.3V for MCU, audio codec, and display interface in head units subject to frequent power cycling and vibration. IC Role / Device Role / Timing Role: High-reliability buck converter with hiccup-mode short-circuit protection and 42V load-dump immunity. Use Value: Survives repeated jump-start events and alternator load dumps without latch-off or component stress. |
Use Scenario: Powers LTE/C-V2X modem, GNSS receiver, and secure MCU in telematics units requiring always-on functionality. IC Role / Device Role / Timing Role: Low-IQ (10μA) buck regulator in skip mode during sleep, transitioning to FPWM during data transmission bursts. Use Value: Extends battery backup runtime beyond 72 hours while maintaining fast wake-up (<100μs) and precise voltage regulation. |
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 | 3.3V fixed, 3.5A, 2.1MHz, no spread spectrum, 12V max input | Lacks 36V input range and CISPR 25 Class 5 compliance; requires external EMI filters for automotive use | Choose when cost sensitivity outweighs EMI performance and input voltage headroom is limited to 12V systems |
| TPS62813-Q1 | 3.3V fixed, 3A, 2.25MHz, 3V–16V input, no load-dump tolerance | Not rated for 42V transients; requires external TVS and UVLO adjustment for 12V automotive battery interface | Prefer for non-safety-critical infotainment subsystems where board space is tighter than EMI constraints |
Compared with LM61480QRNXTQ1 and TPS62813-Q1, the MAX20402AFLB/VY+ uniquely combines 36V input, 42V transient tolerance, integrated spread spectrum, and AEC-Q100 Grade 1 in a 3mm × 3mm FC2QFN-enabling single-chip compliance with stringent automotive EMC and reliability standards without auxiliary components.
Availability
MAX20402AFLB/VY+ is available at Aetrix Electronics and suitable for automotive ADAS, radar modules, and infotainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance under harsh environmental conditions.
Supply support for MAX20402AFLB/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 with precision power, sensing, and signal chain solutions.
The MAX20402/MAX20403 product line was designed specifically for automotive power conversion in safety-critical ADAS and electrification systems, emphasizing ultra-low EMI, wide input range, and AEC-Q100 reliability without external complexity.
FAQ
What is the maximum input voltage rating for MAX20402AFLB/VY+?
The MAX20402AFLB/VY+ has an absolute maximum input voltage of +42V on the SUP pin, making it tolerant to ISO 7637-2 Pulse 5a load-dump transients common in 12V automotive systems. Its operational input range is 3V to 36V, enabling reliable cold-crank operation down to 3V while maintaining 3.3V output regulation.
Does MAX20402AFLB/VY+ require external compensation components?
No, the MAX20402AFLB/VY+ does not require external compensation components. Its MAXQ® power architecture provides inherent stability with >75° phase margin across all recommended output capacitors (e.g., 23μF effective COUT at 2.1MHz), eliminating the need for external RC networks or type-II/III compensators.
How does the PGOOD pin function on MAX20402AFLB/VY+?
The PGOOD pin on MAX20402AFLB/VY+ is an open-drain output that asserts high when VOUT is within 93–105% of nominal 3.3V. It features 100μs rising-edge debounce and 50μs falling-edge debounce, and requires a 20kΩ pull-up resistor to BIAS or VOUT. It signals valid regulation to downstream MCUs or safety monitors.
Can MAX20402AFLB/VY+ operate in forced-PWM mode?
Yes, MAX20402AFLB/VY+ supports forced-PWM (FPWM) mode. Driving the SYNC pin high enables constant-frequency operation at 2.1MHz regardless of load, improving EMI predictability and reducing acoustic noise in sensitive applications like camera modules and radar receivers.
What thermal performance can be expected from MAX20402AFLB/VY+ in a 4-layer PCB layout?
In a standard 4-layer JEDEC board, MAX20402AFLB/VY+ achieves a junction-to-ambient thermal resistance (θJA) of 51.1°C/W. When mounted on a 4-layer evaluation kit with optimized copper pour and thermal vias, θJA improves to 40.6°C/W - enabling full 2.5A output at +70°C ambient without active cooling.
MAX20402AFLB/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
MAX20402AFLB/VY+ FAQ
1.How can I place an order for MAX20402AFLB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLB/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 MAX20402AFLB/VY+ reliable?
The price and inventory of MAX20402AFLB/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20402AFLB/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20402AFLB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLB/VY+?
MAX20402AFLB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLB/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 MAX20402AFLB/VY+?
For technical support, including MAX20402AFLB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLB/VY+ requirements.
6.How does Aetrix verify that MAX20402AFLB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLB/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 MAX20402AFLB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20402AFLB/VY+?
All MAX20402AFLB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLB/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 MAX20402AFLB/VY+ part is unused and in its original packaging.
Return procedure for MAX20402AFLB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20402AFLB/VY+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
