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Analog Devices Inc./Maxim Integrated MAX20429AAFNA/VY+T
- Part No.:
- MAX20429AAFNA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-PowerWFQFN
- Datasheet:
-
MAX20429AAFNA/VY+T.pdf
- Description:
- IC REG BUCK 0.85/0.72V 18FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,700
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Product details
Overview
MAX20429AAFNA/VY+T from Analog Devices is a dual, 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 secondary regulation.
For engineers reviewing the MAX20429AAFNA/VY+T datasheet, MAX20429AAFNA/VY+T pinout, MAX20429AAFNA/VY+T application, or MAX20429AAFNA/VY+T equivalent, this page delivers verified electrical specs, factory-programmable soft-start/RESET timing, dual independent enable/reset control, and FCQFN-18 package layout guidance for point-of-load designs requiring stable low-voltage rails.
Technical Context
The MAX20429AAFNA/VY+T implements peak current-mode control with MAXQ™ architecture for precision transient response and phase margin stability across wide load/line/temperature ranges. Its dual-channel design features independent LX1/LX2 switching nodes, 180° phase shift, and integrated high-side (18mΩ typ) and low-side (12mΩ typ) MOSFETs.
It supports both forced-PWM (via SYNC pin) and skip-mode operation, with factory-programmable soft-start ramp rates (4–32 clocks/step), RESET timeout options (0.3ms–15.6ms), and spread-spectrum oscillator (±3%) to reduce EMI. Thermal shutdown activates at 165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 6A peak per channel - enables single-chip dual-rail supply for high-performance SoCs without external power stages. |
| Output Voltage Range | 0.5V–3.8V in 12.5mV (≤1.5875V) or 50mV (≥1.6V) steps - supports core, I/O, and memory rails with fine-grained factory presetting. |
| Input Voltage Range | 3.0V–5.5V - compatible with common intermediate bus voltages (3.3V, 5V) for post-regulation in automotive and industrial systems. |
| Switching Frequency | 2.1MHz or 3.2MHz - enables use of small all-ceramic capacitors and compact 220nH inductors for space-constrained PCB layouts. |
| Output Accuracy | ±1% over load, line, and temperature - eliminates need for 0.1% feedback resistors while maintaining tight regulation for sensitive digital loads. |
| Efficiency | Up to 96% (5V→3.3V), 90% (5V→1V) - reduces thermal stress and improves system-level power density in thermally constrained environments. |
| Operating Temp | −40°C to +125°C ambient - qualified per AEC-Q100 Grade 1, enabling deployment in under-hood automotive and industrial edge applications. |
Pinout & Package
MAX20429AAFNA/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 pins 5,6,7,8,9). The package supports high-power dissipation (θJA = 19.3°C/W on EV kit) and requires controlled-impedance routing for LX1/LX2 and proper PGND star grounding.
| 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 VOUT exceeds 108% OV or falls below 92% UV; require external pull-up for logic-level signaling. |
| LX1 / LX2 | Switch node connections | Drive external inductors; 180° phase relationship reduces input ripple current and eases input capacitor sizing. |
| PV1 / PV2 | Power input supplies | Separate 3V–5.5V inputs per channel; each requires ≥10µF ceramic bypass to respective PGND2/PGND1. |
| OUT1 / OUT2 | Feedback inputs | Connect directly to output capacitors; support resistor-adjustable VOUT using internal 0.6V reference or factory-preset values. |
| SYNC | Mode control & synchronization input | Logic-high enables forced-PWM; external clock (1.9–2.3MHz or 2.9–3.6MHz) synchronizes switching; open/low enables skip mode. |
| VDD / GND | Analog supply & ground | VDD powers internal analog circuitry (bypassed via 2Ω + 2.2µF); GND is dedicated analog ground, isolated from PGND planes. |
Key Features
| Feature | Design Value |
|---|---|
| MAXQ™ Power Architecture | Delivers maximum dynamic performance under worst-case conditions without derating AC specs - maintains stability across full temperature/load range without sacrificing transient response. |
| Dual Independent Control | Separate EN/RESET pins per channel allow staggered startup, fault isolation, and independent power sequencing in multi-rail systems. |
| Factory-Programmable Timing | Soft-start rate (4–32 clks/step) and RESET timeout (0.3ms–15.6ms) are set at manufacture - eliminates external timing components and ensures repeatable behavior. |
| Spread-Spectrum Oscillator | ±3% frequency dithering reduces EMI peak emissions - critical for automotive EMC compliance without added filtering components. |
| Integrated Low-RDS(on) FETs | 18mΩ high-side and 12mΩ low-side on-resistance - minimizes conduction loss and simplifies layout by eliminating discrete MOSFETs and gate drivers. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC CPU Module |
|---|---|
Use Scenario: Powers dual-core application processor and GPU in radar/vision fusion controller with strict <100ms boot timing. IC Role / Device Role / Timing Role: Secondary regulator generating 1.2V@4A (core) and 1.8V@3A (GPU) from 5V intermediate bus; RESET outputs feed SoC POR logic. Use Value: ±1% accuracy ensures reliable processor operation across −40°C to +125°C; 2.1MHz switching enables compact 3.5mm × 3mm layout footprint. | Use Scenario: Supplies FPGA fabric and I/O banks in modular programmable logic controller with hot-swap capability. IC Role / Device Role / Timing Role: Dual-buck regulator delivering 0.85V@6A (fabric) and 3.3V@2A (I/O) with independent EN control for safe power-up sequencing. Use Value: AEC-Q100 qualification validates reliability for industrial environments; soft-shutdown prevents backfeed during module insertion/removal. |
| 5G Small Cell Baseband Unit | Medical Imaging Sensor Interface |
Use Scenario: Provides clean, low-noise power to RF transceiver ASIC and ADC/DAC in millimeter-wave small cell radio unit. IC Role / Device Role / Timing Role: Point-of-load converter generating 1.0V@5A (RF IC) and 1.2V@3A (data converter) with spread-spectrum mode to suppress switching noise near sensitive analog paths. Use Value: 96% efficiency at 5V→3.3V reduces thermal load in sealed enclosure; SYNC pin allows synchronization to baseband clock for deterministic noise placement. | Use Scenario: Powers high-speed image sensor array and correlated double sampling (CDS) circuitry in portable ultrasound probe. IC Role / Device Role / Timing Role: Dual-output regulator delivering 1.1V@4A (sensor core) and [email protected] (analog front-end) with independent RESET monitoring for fault-safe imaging. Use Value: 108%/92% OV/UV thresholds provide robust rail monitoring; ±7mV accuracy at 0.5V–0.5875V range ensures precise biasing of low-voltage pixel circuits. |
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 spread spectrum; ±1.5% VOUT accuracy | Requires two devices for dual-rail; lacks independent RESET/EN per channel; lower accuracy impacts low-voltage digital loads | Select only if single-rail consolidation is acceptable and AEC-Q100 + 8A single output suffices |
| TPS6521905RGER | Dual 4A/3A outputs; 2.2MHz; no factory-programmable soft-start/RESET; ±1.2% accuracy; no spread spectrum | Lower per-channel current rating; no phase-shifted LX outputs; requires external timing components for sequencing | Choose when cost sensitivity outweighs need for 6A/channel, programmable timing, and EMI reduction |
Compared with MPQ4485GQ-AEC1-Z and TPS6521905RGER, MAX20429AAFNA/VY+T uniquely delivers dual 6A capability with factory-set timing, spread-spectrum EMI suppression, and ±1% accuracy - making it optimal for space-constrained, high-reliability dual-rail systems where layout simplicity and automotive-grade robustness are mandatory.
Availability
MAX20429AAFNA/VY+T is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC CPU modules, 5G small cell baseband units, and medical imaging sensor interfaces requiring stable component supply with AEC-Q100 assurance and long-term production continuity.
Supply support for MAX20429AAFNA/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 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 power management product line, engineered specifically for high-dynamic-range, low-voltage, dual-rail applications in automotive and industrial systems where transient performance, thermal resilience, and EMI control are critical.
FAQ
What is the switching frequency configuration for MAX20429AAFNA/VY+T?
The MAX20429AAFNA/VY+T operates at either 2.1MHz or 3.2MHz - factory-programmed and non-configurable via pins. This fixed-frequency PWM mode enables all-ceramic capacitor designs and predictable EMI profiles. The SYNC pin can synchronize to an external clock within ±10% of the nominal frequency but cannot change the base frequency setting of the MAX20429AAFNA/VY+T itself.
Does MAX20429AAFNA/VY+T support resistor-adjustable output voltage?
Yes, MAX20429AAFNA/VY+T supports resistor-adjustable output voltage using the OUT1/OUT2 pins with an external voltage divider. The internal reference is 0.6V, so VOUT = 0.6V × (R1 + R2)/R2. Factory-preset versions like MAX20429AAFNA/VY+T retain this capability - external resistors can raise the output above the preset value, but lowering it requires trimming the top resistor per datasheet guidance.
How does the RESET function work on MAX20429AAFNA/VY+T?
Each RESET output (RESET1/RESET2) is an active-low open-drain signal that asserts low when its corresponding output voltage exceeds 108% OV or falls below 92% UV. After recovery, RESET remains asserted for a factory-programmable timeout (0.3ms–15.6ms). An external pull-up resistor is required to generate a logic-high level; the MAX20429AAFNA/VY+T itself only pulls low.
Is MAX20429AAFNA/VY+T pin-compatible with other variants in the MAX20429 family?
No - MAX20429AAFNA/VY+T is not pin-compatible with other MAX20429 variants (e.g., MAX20429CAFNA/VY+, MAX20429DAFNA/VY+). While all share the same FCQFN-18 package and pinout, factory-programmed parameters (soft-start rate, RESET timeout, spread-spectrum enable, current limit option) differ and are not user-modifiable. Swapping variants may cause unexpected timing or protection behavior.
What thermal protection features does MAX20429AAFNA/VY+T include?
MAX20429AAFNA/VY+T includes overtemperature shutdown at 165°C (typical junction temperature) with 15°C hysteresis. When triggered, both outputs disable and remain off until the die cools sufficiently. This protection is independent of load current and responds solely to silicon temperature - ensuring reliability during sustained overload or poor heatsinking conditions in automotive and industrial deployments.
MAX20429AAFNA/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:
- 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+T FAQ
1.How can I place an order for MAX20429AAFNA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20429AAFNA/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 MAX20429AAFNA/VY+T reliable?
The price and inventory of MAX20429AAFNA/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 MAX20429AAFNA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20429AAFNA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20429AAFNA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20429AAFNA/VY+T?
MAX20429AAFNA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20429AAFNA/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 MAX20429AAFNA/VY+T?
For technical support, including MAX20429AAFNA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20429AAFNA/VY+T requirements.
6.How does Aetrix verify that MAX20429AAFNA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20429AAFNA/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 MAX20429AAFNA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20429AAFNA/VY+T?
All MAX20429AAFNA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20429AAFNA/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 MAX20429AAFNA/VY+T part is unused and in its original packaging.
Return procedure for MAX20429AAFNA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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