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Analog Devices Inc./Maxim Integrated MAX20079DATP/VY+
- Part No.:
- MAX20079DATP/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079DATP/VY+.pdf
- Description:
- IC REG BCK PROG/3V 3.5A 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:631
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Product details
Overview
MAX20079DATP/VY+ from Analog Devices is an automotive-grade synchronous buck converter with integrated high-side and low-side MOSFETs, delivering up to 3.5A output current across a 3V–36V input range while consuming only 3.5μA quiescent current at no load. It features ±2% output voltage accuracy (3.3V/5V fixed or 3V–12V programmable), 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for under-hood power conversion in engine control units and ADAS modules.
For engineers reviewing the MAX20079DATP/VY+ datasheet, MAX20079DATP/VY+ pinout, MAX20079DATP/VY+ application, or MAX20079DATP/VY+ equivalent, key selection criteria include its 65ns minimum on-time for high VIN/VOUT ratios, 40V load-dump protection, 99% dropout duty cycle, spread-spectrum EMI reduction via SPS pin, and side-wettable TQFN package enabling automated optical inspection (AOI) and robust thermal performance in automotive PCB assemblies.
Technical Context
The MAX20079DATP/VY+ implements current-mode control with internal slope compensation and no external compensation required. Its architecture supports both forced-PWM (via SYNC pin tied to BIAS) and pulse-skipping modes, with automatic mode transition based on load and SYNC state.
It integrates a 5V internal BIAS LDO, undervoltage lockout (2.725V typ), thermal shutdown at 175°C (15°C hysteresis), and overcurrent protection with 4.7A peak limit (±12% tolerance). The device maintains regulation down to 3V input and tolerates 40V transients, meeting ISO 7637-2 pulse 5a requirements for automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5A continuous - supports high-power microcontrollers and sensor clusters without external boost stages. |
| Input Voltage Range | 3V to 36V - covers cold-crank (3V), nominal 12V/24V, and load-dump (40V transient) conditions. |
| Quiescent Current | 3.5μA at no load - enables >10-year battery standby life in always-on automotive modules. |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ) - 2.1MHz enables <2.2μH inductors and compact 35μF ceramic output caps; 400kHz maximizes efficiency at full load. |
| Output Voltage Accuracy | ±2% over +6V to +18V input - ensures reliable logic-level compliance for 3.3V/5V digital subsystems. |
| Minimum On-Time | 65ns (typ) - allows 12V→1.2V conversion at 2.1MHz without pulse skipping, critical for high-ratio point-of-load designs. |
| Duty Cycle Max | 99% - sustains regulation during deep dropout (e.g., 5.5V input → 5V output), eliminating need for pre-regulator. |
Pinout & Package
MAX20079DATP/VY+ uses a 20-pin side-wettable TQFN package (4mm × 4mm, outline 21-100318), optimized for AOI and thermal dissipation via exposed pad soldered to PCB ground plane. Thermal resistance θJA is 33°C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Accepts 0–40V logic; no internal pullup/pulldown - enables direct connection to automotive KEY/CAN inhibit signals with minimal leakage. |
| BST | Bootstrap supply for high-side gate driver | Requires 0.1μF ceramic capacitor to LX; enables efficient 100% duty-cycle operation in dropout by sustaining gate drive. |
| SUP (Pins 4,5,11) | Main input supply | Three parallel pins reduce IR drop and EMI; each requires local 4.7μF ceramic decoupling for stable high-frequency operation. |
| LX (Pins 8,9) | Switch node | Connects to inductor; internal clamp diodes to PGND/AGND - must avoid forward-biasing beyond package power limits. |
| FB | Feedback reference input | 1.0V ±1.5% internal reference; connects to resistor divider for 3V–12V programming or to BIAS for factory-trimmed 3.3V/5V outputs. |
| BIAS | Internal 5V bias supply output | Provides regulated 5V for external circuitry; requires ≥1μF ceramic capacitor to ground for stability and noise suppression. |
| PGOOD | Open-drain power-good indicator | Active-high signal debounced at 60–110μs; asserts when VOUT reaches 93% of target - simplifies multi-rail sequencing in ECUs. |
| SYNC | Mode control / synchronization input | Pulled down internally (1MΩ); tie to BIAS for forced PWM, float or ground for skip mode - enables dynamic efficiency optimization. |
| SPS | Spread-spectrum enable | Logic-high enables ±3% frequency modulation - reduces EMI peak emissions without affecting SYNC-synchronized operation. |
| PGND (Pins 7,10,16,19) | Power ground return | Four dedicated pins minimize ground bounce and improve current sharing between high-side/low-side FETs. |
| AGND | Analog ground reference | Separate from PGND to isolate sensitive feedback and oscillator circuits from high di/dt switching noise. |
| OUT | Output voltage sense | Direct connection to output rail; bypassed with ceramic capacitors to PGND - forms low-impedance path for high-frequency ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates external MOSFETs and drivers - reduces BOM count by ≥6 components and PCB area by >40% vs discrete solutions. |
| Side-wettable TQFN package | Enables automated optical inspection of solder joints - critical for zero-defect automotive manufacturing and long-term reliability validation. |
| 65ns minimum on-time | Supports 12V→1.2V conversion at 2.1MHz without frequency foldback - preserves loop bandwidth and transient response in high-ratio applications. |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS - removes need for costly 40V-rated input capacitors and clamping networks. |
| Ultra-low 3.5μA quiescent current | Extends battery life in always-on domains (e.g., telematics, body controllers) - meets UNECE R100 Class 3 sleep-mode requirements. |
| Programmable soft-start (3.5ms/5.5ms) | Prevents inrush current during power-up - avoids brownout in shared 12V rails and eliminates need for external timing components. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module Power |
|---|---|
|
Use Scenario: Powers 32-bit ARM Cortex-M7 MCU, CAN FD transceiver, and analog front-end in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with PGOOD sequencing and load-dump survival. Use Value: Maintains regulation during cranking (5.5V min) and load dump (40V max), ensuring uninterrupted CAN communication and sensor sampling. |
Use Scenario: Supplies image sensor, ISP, and MIPI interface in 8MP surround-view camera modules operating at -40°C to +105°C ambient. IC Role / Device Role / Timing Role: High-efficiency 1.2V/1.8V/3.3V triple-output source with ultra-low Iq and thermal shutdown. Use Value: Delivers 3.5A peak current during image capture bursts while drawing only 3.5μA in idle - extends vehicle off-time battery life. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Controller |
|
Use Scenario: Generates clean 1.1V core and 3.3V I/O rails for quad-core application processor and touch controller in head units. IC Role / Device Role / Timing Role: Secondary buck regulator following primary DC-DC; uses 2.1MHz switching to avoid AM band interference. Use Value: 2.1MHz operation enables small 2.2μH inductor and 35μF ceramic output cap - reduces solution size by 35% vs 400kHz alternatives. |
Use Scenario: Provides isolated 5V auxiliary supply for motor position sensors and safety-monitoring MCU in EPS systems. IC Role / Device Role / Timing Role: Redundant power source with independent EN control and PGOOD monitoring per ASIL-B requirements. Use Value: AEC-Q100 Grade 0 qualification (-40°C to +150°C junction) and 99% dropout ensure torque assist continuity during battery sag. |
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 | 4.0A output, 3.5V–36V input, 15μA Iq, 2.1MHz fixed, no spread spectrum, QFN-16 | Lacks side-wettable leads and 40V load-dump rating; requires external compensation | Preferred where higher output current is needed but AEC-Q100 Grade 0 and AOI capability are not required. |
| TPS62933QPWRQ1 | 3.5A output, 3V–36V input, 2.5μA Iq, 2.2MHz fixed, integrated ferrite-bead filter, WQFN-20 | No 400kHz option, no programmable soft-start, lower thermal shutdown threshold (165°C) | Selected when lowest possible Iq and built-in EMI filtering are prioritized over dropout performance and load-dump ruggedness. |
Compared with LM61480QRNXTQ1 and TPS62933QPWRQ1, MAX20079DATP/VY+ uniquely combines AEC-Q100 Grade 0, 40V load-dump immunity, side-wettable TQFN for AOI, and dual-frequency operation - making it the only choice for safety-critical, space-constrained automotive power nodes requiring zero-defect manufacturability and field reliability.
Availability
MAX20079DATP/VY+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, infotainment head units, and electric power steering controllers requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX20079DATP/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 connectivity solutions.
MAX20079DATP/VY+ belongs to Analog Devices' automotive power management portfolio, engineered specifically for harsh-environment DC-DC conversion in engine bays and ADAS domains - emphasizing ultra-low Iq, load-dump resilience, and AEC-Q100 compliance.
FAQ
What is the maximum input voltage transient the MAX20079DATP/VY+ can withstand?
The MAX20079DATP/VY+ is rated for 40V absolute maximum input voltage and is designed to survive ISO 7637-2 Pulse 5a load-dump transients without external protection. This 40V rating applies to the SUP pin and enables direct connection to automotive battery rails without additional TVS diodes or clamping circuits in most ECU and body-control applications.
Does the MAX20079DATP/VY+ support both fixed and adjustable output voltages?
Yes, the MAX20079DATP/VY+ supports both configurations: connect FB directly to BIAS for factory-trimmed 3.3V or 5V outputs, or use an external resistor divider from OUT to FB to AGND to set any output between 3V and 12V. The internal feedback reference is precisely 1.0V ±1.5%, enabling accurate programmable regulation across the full range.
How does the MAX20079DATP/VY+ achieve ultra-low quiescent current in standby mode?
The MAX20079DATP/VY+ achieves 3.5μA typical quiescent current by disabling non-essential circuitry-including the internal high-voltage LDO-when operating in skip mode at light loads (<5mA). In standby mode, only the feedback comparator and minimal bias remain active, enabling >10-year battery life in always-on automotive modules such as telematics and remote keyless entry systems.
What package type and thermal performance does the MAX20079DATP/VY+ use?
The MAX20079DATP/VY+ uses a 20-pin side-wettable TQFN package (4mm × 4mm) with exposed thermal pad. On a 4-layer PCB, its junction-to-ambient thermal resistance (θJA) is 33°C/W, and junction-to-case (θJC) is 2°C/W. The symmetrical pin layout and dual SUP/LX connections further enhance thermal spreading and EMI cancellation in dense automotive layouts.
Can the MAX20079DATP/VY+ operate in dropout, and what is its minimum dropout voltage?
Yes, the MAX20079DATP/VY+ operates in dropout with up to 99% duty cycle, enabling regulation even when input voltage approaches output voltage. For a 5V output, dropout occurs below ~5.05V input (accounting for RDS(on) losses), and the device sustains regulation continuously down to 3V input - making it suitable for cold-crank scenarios in 12V automotive systems.
MAX20079DATP/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3V (5V)
- Voltage - Output (Max):
- 12V
- Current - Output:
- 3.5A
- 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:
- 20-SWTQFN (4x4)
MAX20079DATP/VY+ FAQ
1.How can I place an order for MAX20079DATP/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079DATP/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 MAX20079DATP/VY+ reliable?
The price and inventory of MAX20079DATP/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20079DATP/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20079DATP/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079DATP/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079DATP/VY+?
MAX20079DATP/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079DATP/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 MAX20079DATP/VY+?
For technical support, including MAX20079DATP/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079DATP/VY+ requirements.
6.How does Aetrix verify that MAX20079DATP/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20079DATP/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 MAX20079DATP/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20079DATP/VY+?
All MAX20079DATP/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079DATP/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 MAX20079DATP/VY+ part is unused and in its original packaging.
Return procedure for MAX20079DATP/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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