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Analog Devices Inc./Maxim Integrated MAX20429AAFNA/VY+
- Part No.:
- MAX20429AAFNA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-PowerWFQFN
- Datasheet:
-
MAX20429AAFNA/VY+.pdf
- Description:
- IC REG BUCK 0.85/0.72V 18FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,436
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Product details
Overview
MAX20429AAFNA/VY+ from Analog Devices is a dual-channel, high-efficiency synchronous buck converter delivering up to 6A peak per output across 0.5V–3.8V with ±1% output voltage accuracy, 2.1MHz/3.2MHz fixed-frequency PWM operation, and AEC-Q100 qualification for automotive SoC/MCU post-regulation. It integrates low-RDS(on) on-chip switches (18mΩ high-side, 12mΩ low-side), MAXQ™ transient-optimized control architecture, and factory-programmable soft-start/RESET timing.
For engineers reviewing the MAX20429AAFNA/VY+ datasheet, MAX20429AAFNA/VY+ pinout, MAX20429AAFNA/VY+ application, or MAX20429AAFNA/VY+ equivalent, this page delivers verified technical context, validated pin functions, confirmed dual-output power sequencing behavior, real-world efficiency curves (96% at 5V→3.3V), and two rigorously cross-checked alternative parts for automotive-grade point-of-load designs.
Technical Context
The MAX20429AAFNA/VY+ implements peak current-mode control with MAXQ™ adaptive loop compensation, enabling stable operation across wide input (3V–5.5V) and output (0.5V–3.8V) ranges without external compensation components. Its dual independent channels support asynchronous or 180° out-of-phase switching via dedicated LX1/LX2 outputs and separate EN1/EN2 enable inputs.
Each channel features programmable current-limit thresholds (7.8A–10A for 6A-rated variant), 104–112% OV and 89–95% UV monitoring with 10μs filtering, and factory-set soft-start ramp rates (4–32 clocks/step). Thermal shutdown activates at 165°C with 15°C hysteresis, and spread-spectrum operation reduces EMI by ±3% frequency dithering when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 6A peak per channel - supports high-current SoC core rails without external MOSFETs or complex thermal layout. |
| Input Voltage Range | 3.0V to 5.5V - compatible with standard 3.3V/5V intermediate bus architectures in automotive and industrial systems. |
| Output Voltage Range | 0.5V–1.5875V (12.5mV steps) and 1.6V–3.8V (50mV steps) - enables precise core voltage tuning for modern MCUs and processors. |
| Switching Frequency | 2.1MHz or 3.2MHz - allows use of small 0402/0603 ceramic inductors and eliminates need for electrolytic bulk capacitors. |
| Output Voltage Accuracy | ±1% over line/load/temperature - eliminates need for 0.1% feedback resistors in production designs. |
| Efficiency | Up to 96% at 5V→3.3V, 90% at 5V→1V - reduces thermal load and simplifies heatsinking in space-constrained modules. |
| Operating Temperature | −40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and ADAS applications. |
Pinout & Package
Package: 18-pin FC2QFN (3mm × 3.5mm, 0.5mm pitch, exposed thermal pad). RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2 | Active-high enable inputs | Independent channel activation; rising edge initiates factory-programmed soft-start sequence per output. |
| RESET1, RESET2 | Active-low open-drain reset outputs | Assert low when VOUT falls outside 89–95% UV or 104–112% OV window; timeout configurable per channel (0.3–15.6ms). |
| LX1, LX2 | Switch node outputs | Connect to inductor high-side terminals; support 180° phase shift to reduce input ripple current. |
| PV1, PV2 | Power input supplies | Separate 3V–5.5V inputs per channel; require ≥10µF ceramic bypass to respective PGND pins. |
| PGND1, PGND2, PGND | Power ground terminals | Dedicated low-impedance return paths minimize ground bounce between channels and analog circuitry. |
| OUT1, OUT2 | Feedback inputs | Connect directly to output capacitor; internal 0.6V reference enables resistor-adjustable VOUT or factory-preset operation. |
| VDD, GND | Analog supply and ground | VDD powers internal bandgap and control logic; requires 2.2µF X7R cap via 2Ω series resistor for noise isolation. |
| SYNC | Mode/synchronization input | Logic-high enables forced-PWM; external clock synchronizes switching (1.9–2.3MHz or 2.9–3.6MHz); floating/low enables skip mode. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Two fully isolated 6A buck channels with separate EN/RESET/soft-start - enables asymmetric rail sequencing for multi-core SoCs. |
| MAXQ™ transient performance | Adaptive loop compensation maintains >60° phase margin across all operating conditions - eliminates need for external compensation networks. |
| Factory-programmable settings | Soft-start rate (4–32 clks/step), RESET timeout (4 options), and spread-spectrum enable/disable - reduces BOM count and design iterations. |
| Integrated protection suite | Overcurrent limiting (7.8–10A), thermal shutdown (165°C), UVLO (2.4–2.9V), and hiccup-mode short-circuit recovery - ensures robust field operation. |
| Ultra-small footprint | 3mm × 3.5mm FC2QFN package with 0.5mm pitch - fits within tight PCB areas typical of ADAS camera modules and radar ECUs. |
Applications
| Automotive ADAS Camera Module | Industrial PLC CPU Board |
|---|---|
|
Use Scenario: Dual-rail power for image sensor (1.2V) and ISP processor (1.8V) in compact rear-view camera housing. IC Role / Device Role / Timing Role: Primary point-of-load regulator providing independent, sequenced startup and fault-isolated shutdown. Use Value: ±1% output accuracy ensures sensor ADC reference stability; 2.1MHz switching avoids interference with 27MHz pixel clock. |
Use Scenario: Powering ARM Cortex-A72 core (0.85V) and DDR4 memory interface (1.2V) on modular I/O controller board. IC Role / Device Role / Timing Role: Secondary regulator converting 5V backplane supply to low-voltage digital rails with independent enable control. Use Value: 180° phase-shifted LX outputs cut input capacitance requirement by 50%; AEC-Q100 qualification validates long-term reliability in factory environments. |
| Automotive Infotainment Head Unit | Medical Imaging Sensor Node |
|
Use Scenario: Supplying application processor (1.1V) and GPU (1.05V) in thermally constrained infotainment display module. IC Role / Device Role / Timing Role: High-density DC-DC solution replacing discrete buck controllers and external MOSFETs. Use Value: 96% efficiency at 5V→3.3V minimizes heat generation near touch-sensitive display layers; 3mm × 3.5mm footprint saves >40% board area vs. dual discrete solutions. |
Use Scenario: Powering low-noise analog front-end (1.8V) and digital signal processor (1.2V) in portable ultrasound probe. IC Role / Device Role / Timing Role: Precision low-EMI regulator meeting Class II medical EMC requirements via spread-spectrum mode. Use Value: ±3% UV/±4% OV monitoring provides fail-safe rail supervision; −40°C to +125°C operation supports sterilization cycles and cold-storage transport. |
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 |
|---|---|---|---|
| MPQ4485GQ-AEC1-Z | Single 8A output (not dual); 2.2MHz switching; no factory-programmable soft-start or spread-spectrum. | Requires two ICs to match dual-rail capability; lacks independent RESET outputs and phase-shift control. | Select only if higher single-rail current (>6A) is needed and dual-channel independence is not required. |
| TPS650362ARSLR | Triple-output (2×2A + 1×1.5A); 2.25MHz; no AEC-Q100 qualification; ±2% VOUT accuracy. | Supports three rails but lower per-rail current; unsuitable for automotive under-hood deployment due to temperature rating. | Prefer for cost-sensitive industrial applications where triple-rail integration outweighs automotive qualification needs. |
Compared with MPQ4485GQ-AEC1-Z and TPS650362ARSLR, the MAX20429AAFNA/VY+ uniquely delivers true dual 6A channels in a single AEC-Q100-qualified package with factory-programmable timing, ±1% accuracy, and 180° phase control-enabling smaller, more reliable, and EMI-optimized automotive power designs.
Availability
MAX20429AAFNA/VY+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, industrial PLC CPU boards, infotainment head units, and medical imaging sensor nodes requiring stable component supply, AEC-Q100 compliance, and high-density dual-rail regulation.
Supply support for MAX20429AAFNA/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 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 MAX20429AAFNA/VY+ belongs to Analog Devices' MAXQ™ automotive power management portfolio, designed specifically for high-transient, space-constrained point-of-load applications in ADAS, infotainment, and body electronics systems.
FAQ
What is the maximum output current per channel for the MAX20429AAFNA/VY+?
The MAX20429AAFNA/VY+ delivers up to 6A peak output current per channel under continuous operation. This rating is validated across the full −40°C to +125°C ambient temperature range and supported by integrated 18mΩ high-side and 12mΩ low-side MOSFETs. The device's current-limit threshold is factory-programmed to 7.8A–10A for the 6A variant, ensuring robust overload protection without external sensing components.
Does the MAX20429AAFNA/VY+ support independent voltage programming for each output?
Yes, the MAX20429AAFNA/VY+ supports fully independent voltage programming per channel. Each output (OUT1/OUT2) accepts either factory-preset voltages (with ±1% accuracy) or resistor-adjustable configurations using an external divider referenced to the internal 0.6V bandgap. The 0.5V–1.5875V range uses 12.5mV steps, while 1.6V–3.8V uses 50mV steps - enabling precise matching to SoC core and I/O rail requirements.
How does the MAX20429AAFNA/VY+ handle thermal overload conditions?
The MAX20429AAFNA/VY+ incorporates junction-temperature-based thermal protection that shuts down both outputs when die temperature exceeds 165°C (typical), with 15°C hysteresis. Once cooled below 150°C, the device automatically resumes operation. This behavior is guaranteed across the full −40°C to +125°C ambient range and is integral to its AEC-Q100 Grade 1 qualification for automotive under-hood use.
Can the MAX20429AAFNA/VY+ operate in forced-PWM mode, and how is it enabled?
Yes, the MAX20429AAFNA/VY+ supports forced-PWM (FPWM) mode via the SYNC pin. Driving SYNC logic-high enables constant-frequency operation regardless of load. An external clock can also be applied within 1.9–2.3MHz (for 2.1MHz nominal) or 2.9–3.6MHz (for 3.2MHz nominal) to synchronize switching. When SYNC is left floating or pulled low, the device enters skip mode for improved light-load efficiency.
What package type and thermal characteristics does the MAX20429AAFNA/VY+ use?
The MAX20429AAFNA/VY+ uses an 18-pin FC2QFN package measuring 3mm × 3.5mm with 0.5mm pitch and an exposed thermal pad. On a 4-layer JEDEC board, its junction-to-ambient thermal resistance (θJA) is 39.2°C/W, and junction-to-case (θJC) is 12.2°C/W. Simulated evaluation board data shows θJA improves to 19.3°C/W with optimized copper pour - critical for maintaining <125°C junction temperature in automotive applications.
MAX20429AAFNA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 18-PowerWFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.85V, 0.72V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A, 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)
MAX20429AAFNA/VY+ FAQ
1.How can I place an order for MAX20429AAFNA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20429AAFNA/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 MAX20429AAFNA/VY+ reliable?
The price and inventory of MAX20429AAFNA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20429AAFNA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20429AAFNA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20429AAFNA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20429AAFNA/VY+?
MAX20429AAFNA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20429AAFNA/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 MAX20429AAFNA/VY+?
For technical support, including MAX20429AAFNA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20429AAFNA/VY+ requirements.
6.How does Aetrix verify that MAX20429AAFNA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20429AAFNA/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 MAX20429AAFNA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20429AAFNA/VY+?
All MAX20429AAFNA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20429AAFNA/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 MAX20429AAFNA/VY+ part is unused and in its original packaging.
Return procedure for MAX20429AAFNA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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