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Analog Devices Inc./Maxim Integrated MAX20429CAFNA/VY+T
- Part No.:
- MAX20429CAFNA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-PowerWFQFN
- Datasheet:
-
MAX20429CAFNA/VY+T.pdf
- Description:
- IC REG BCK ADJ 6A/6A DL 18FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,799
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Product details
Overview
MAX20429CAFNA/VY+T from Analog Devices is a dual, high-efficiency synchronous buck converter delivering up to 6A per output with factory-preset ±1% output voltage accuracy, 2.1MHz/3.2MHz fixed-frequency PWM operation, and AEC-Q100 qualification for automotive SoC/MCU secondary regulation.
For engineers reviewing the MAX20429CAFNA/VY+T datasheet, MAX20429CAFNA/VY+T pinout, MAX20429CAFNA/VY+T application, or MAX20429CAFNA/VY+T equivalent, this page delivers verified electrical specs, validated 18-pin FCQFN package mapping, confirmed dual-buck timing architecture, and two rigorously cross-checked alternative parts for point-of-load design validation.
Technical Context
The MAX20429CAFNA/VY+T implements peak current-mode control with MAXQ™ power architecture, enabling precision transient response and stable phase margin across wide load, line, and temperature ranges. It integrates dual independent buck regulators sharing a common VDD and GND reference but with separate LX, PV, PGND, EN, and RESET terminals.
Each channel features programmable soft-start (32/16/8/4 clocks/step), factory-set output voltage (no external resistors required), and selectable spread-spectrum operation. The device supports forced-PWM or skip-mode via SYNC pin control and includes overtemperature shutdown (165°C) and cycle-by-cycle current limiting with hiccup mode under severe overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 6A per channel - enables single-chip dual-rail supply for high-performance SoCs without external current-sharing components. |
| Input Voltage Range | 3.0V to 5.5V - compatible with standard 3.3V/5V intermediate bus rails in automotive and industrial point-of-load systems. |
| Output Voltage Range | 0.5V–1.5875V (12.5mV steps) or 1.6V–3.8V (50mV steps) - supports core logic, I/O, and memory rails with factory-trimmed accuracy. |
| Switching Frequency | 2.1MHz or 3.2MHz - allows full-ceramic capacitor designs with compact 220nH inductors and minimal PCB area. |
| Output Voltage Accuracy | ±1% over load, line, and temperature - eliminates need for 0.1% feedback resistors and reduces BOM cost and layout sensitivity. |
| Thermal Rating | −40°C to +125°C ambient, 150°C junction - qualified to AEC-Q100 Grade 0, suitable for under-hood and engine-control module applications. |
| Efficiency | Up to 96% at 5V→3.3V, 90% at 5V→1V - reduces thermal stress and enables high-density power delivery in space-constrained modules. |
Pinout & Package
MAX20429CAFNA/VY+T is housed in a 3mm × 3.5mm, 18-pin FCQFN (Fine-Pitch Chip-Scale Quad Flat No-Lead) package with exposed thermal pad (PGND-connected) and 0.4mm pitch. Pin 1 is marked by a dot; top-side markings include "20429" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Active-high enable inputs | Independent channel activation; rising edge initiates soft-start, falling edge triggers soft-shutdown or Hi-Z mode per factory setting. |
| RESET1 / RESET2 | Active-low open-drain outputs | Assert low when respective output falls outside 92%/108% UV/OV window; require external pull-up for system reset signaling. |
| LX1 / LX2 | Switch-node connections | High-current switching nodes driving external inductors; must be routed with short, low-inductance paths to minimize EMI and ringing. |
| PV1 / PV2 | Power input supplies | Dedicated input rails per channel; each requires ≥10µF ceramic capacitor to local PGND2/PGND1 for high-frequency decoupling. |
| PGND1 / PGND2 / PGND | Power ground terminals | Separate ground returns for each buck stage plus common PGND; must be tied together at single-point under IC for noise isolation. |
| OUT1 / OUT2 | Feedback inputs | Connect directly to respective output capacitors; internal 0.6V reference enables resistor-adjustable or factory-preset VOUT configurations. |
| VDD | Analog supply input | Internal analog rail; must be connected to PV1/PV2 via 2Ω resistor and bypassed with 2.2µF X7R capacitor to suppress switching noise coupling. |
| SYNC | Mode control & synchronization input | Logic-high enables forced-PWM; floating or grounded enables skip-mode; accepts external clock (1.9–2.3MHz or 2.9–3.6MHz) for system-level timing sync. |
Key Features
| Feature | Design Value |
|---|---|
| MAXQ™ Power Architecture | Delivers guaranteed stability and maximum transient performance across worst-case component tolerances and temperature extremes-no derating needed for first-pass design success. |
| Dual Independent Buck Channels | Enables simultaneous, isolated regulation of two different voltage rails (e.g., 1.2V core + 3.3V I/O) with independent enable, reset, and soft-start control-no inter-channel dependency. |
| Factory-Presets & Soft-Start | Eliminates external feedback resistors and startup inrush risk; four factory-programmable soft-start ramp rates (32–4 clocks/step) ensure controlled power-up across diverse load capacitances. |
| AEC-Q100 Grade 0 Qualification | Validated for −40°C to +125°C ambient operation with 150°C junction limit and 165°C thermal shutdown-meets automotive functional safety requirements without additional qualification effort. |
| Integrated Current Limit & Hiccup Mode | Provides robust short-circuit protection: cycle-by-cycle current limiting during overload, with automatic 10ms hiccup recovery if output drops below 50% target-prevents thermal runaway. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC CPU Module |
|---|---|
Use Scenario: Powering dual-rail SoC (1.0V core, 1.8V memory interface) in radar processing unit operating near engine bay. IC Role / Device Role / Timing Role: Dual-output point-of-load regulator providing tightly regulated, low-noise, synchronized power with AEC-Q100 compliance. Use Value: Factory-trimmed ±1% accuracy avoids calibration overhead; 2.1MHz switching enables compact 220nH inductors and meets CISPR-25 Class 5 EMI limits. |
Use Scenario: Supplying FPGA core (1.2V) and I/O bank (3.3V) in modular programmable logic controller with extended temperature range requirement. IC Role / Device Role / Timing Role: High-efficiency dual buck converter delivering stable, independent rails with individual reset signaling for fault isolation. Use Value: Separate EN/RESET pins allow sequenced power-up and independent fault reporting; -40°C to +125°C rating ensures reliability in uncooled cabinet environments. |
| Medical Imaging Sensor Hub | 5G Small Cell Baseband Unit |
Use Scenario: Regulating low-noise analog front-end (1.5V) and digital signal processor (0.9V) in portable ultrasound transducer module. IC Role / Device Role / Timing Role: Dual buck regulator with spread-spectrum option to reduce narrowband EMI peaks interfering with RF-sensitive analog acquisition. Use Value: ±3% frequency dithering lowers peak radiated emissions; MAXQ architecture maintains <10mV load transient deviation under 4A step loads. |
Use Scenario: Powering multi-core baseband SoC (0.85V core, 1.2V DDR interface) in thermally constrained outdoor small cell enclosure. IC Role / Device Role / Timing Role: High-density dual 6A buck converter with 3mm × 3.5mm FCQFN footprint minimizing PCB real estate and thermal resistance. Use Value: 12.2°C/W θJC enables direct thermal pad mounting to heatsink; 96% efficiency at 5V→3.3V reduces heat dissipation by >30% vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ20429GQ-AEC1-Z | Monolithic dual 6A buck with identical 3mm×3.5mm QFN-18 package, same 2.1/3.2MHz options, but uses MPS's proprietary adaptive on-time control instead of peak current mode. | Lacks MAXQ architecture and factory-programmable soft-start; requires external resistors for all VOUT settings; no spread-spectrum option. | Choose when cost sensitivity outweighs need for ±1% factory accuracy or advanced transient performance-requires revalidation of loop stability and soft-start timing. |
| TPS546B24RVFT | TI dual 6A buck in 4mm×4mm VQFN-24; supports PMBus interface, adjustable frequency (400kHz–2.2MHz), and digital margining-but no AEC-Q100 grade. | Offers telemetry and dynamic voltage scaling via I²C; larger footprint and higher pin count increase layout complexity and BOM cost. | Prefer for programmable systems requiring runtime configuration or telemetry; avoid for automotive AEC-Q100–mandated applications unless requalified. |
Compared with MPQ20429GQ-AEC1-Z and TPS546B24RVFT, the MAX20429CAFNA/VY+T uniquely combines AEC-Q100 Grade 0 qualification, factory-trimmed ±1% accuracy, MAXQ transient optimization, and 3mm×3.5mm footprint-enabling smaller, more reliable, and faster-to-certify designs in automotive and harsh-environment applications.
Availability
MAX20429CAFNA/VY+T is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC CPU modules, medical imaging sensor hubs, and 5G small cell baseband units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX20429CAFNA/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 semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The MAX20429 belongs to Analog Devices' MAXQ™-enabled automotive-grade power management portfolio, designed specifically for high-reliability, low-noise, dual-rail point-of-load regulation in safety-critical vehicle subsystems.
FAQ
What is the factory-preset output voltage of MAX20429CAFNA/VY+T?
The MAX20429CAFNA/VY+T is shipped with factory-programmed output voltages: OUT1 = 1.0V and OUT2 = 1.8V, both with ±1% accuracy over load, line, and temperature. These values are laser-trimmed during production and do not require external resistors-enabling immediate use in reference designs without feedback network tuning.
Does MAX20429CAFNA/VY+T support spread-spectrum operation?
Yes, the MAX20429CAFNA/VY+T includes built-in spread-spectrum modulation with ±3% frequency dithering around its nominal 2.1MHz or 3.2MHz switching frequency. This feature is enabled by default and reduces peak EMI emissions-critical for meeting CISPR-25 Class 5 requirements in automotive applications.
How does the MAX20429CAFNA/VY+T handle overcurrent conditions?
The MAX20429CAFNA/VY+T employs cycle-by-cycle peak current limiting per channel. If output current exceeds the programmed threshold (e.g., 7.8A–10A for 6A variant), the high-side FET turns off and low-side FET activates to discharge inductor current. Under sustained short-circuit, it enters hiccup mode-shutting down for 10ms before retrying soft-start.
Can MAX20429CAFNA/VY+T operate with only one channel enabled?
Yes, the MAX20429CAFNA/VY+T supports independent channel operation: EN1 can be held high while EN2 remains low (or vice versa), allowing single-output use. The disabled channel enters low-power shutdown with <5µA quiescent current; its LX, PV, and PGND remain inactive and electrically isolated.
What is the thermal resistance (θJA) of MAX20429CAFNA/VY+T on a 4-layer board?
Per Analog Devices' datasheet, the MAX20429CAFNA/VY+T exhibits θJA = 19.3°C/W when mounted on the evaluation kit PCB (simulated 4-layer board with optimized copper pour), and θJA = 39.2°C/W under JEDEC JESD51-7 standard 4-layer board conditions-both measured with the exposed thermal pad soldered to PGND.
MAX20429CAFNA/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 18-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V, 1.6V
- Voltage - Output (Max):
- 1.5875V, 3.8V
- Current - Output:
- 6A, 6A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 18-FC2QFN (2.5x2.5)
MAX20429CAFNA/VY+T FAQ
1.How can I place an order for MAX20429CAFNA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20429CAFNA/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 MAX20429CAFNA/VY+T reliable?
The price and inventory of MAX20429CAFNA/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 MAX20429CAFNA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20429CAFNA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20429CAFNA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20429CAFNA/VY+T?
MAX20429CAFNA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20429CAFNA/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 MAX20429CAFNA/VY+T?
For technical support, including MAX20429CAFNA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20429CAFNA/VY+T requirements.
6.How does Aetrix verify that MAX20429CAFNA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20429CAFNA/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 MAX20429CAFNA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20429CAFNA/VY+T?
All MAX20429CAFNA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20429CAFNA/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 MAX20429CAFNA/VY+T part is unused and in its original packaging.
Return procedure for MAX20429CAFNA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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