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Analog Devices Inc./Maxim Integrated MAX20079DATP/VY+T
- Part No.:
- MAX20079DATP/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079DATP/VY+T.pdf
- Description:
- IC REG BCK PROG/3V 3.5A 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,133
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Product details
Overview
MAX20079DATP/VY+T 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 provides ±2% output voltage accuracy over 6V–18V input, supports fixed (3.3V/5V) or adjustable (3V–12V) outputs, and operates at 2.1MHz or 400kHz switching frequencies - enabling compact, low-EMI power supplies in automotive infotainment and ADAS ECUs.
For engineers reviewing the MAX20079DATP/VY+T datasheet, MAX20079DATP/VY+T pinout, MAX20079DATP/VY+T application, or MAX20079DATP/VY+T equivalent, key selection criteria include its AEC-Q100 qualification, 40V load-dump protection, 65ns minimum on-time for high VIN/VOUT ratios, 99% dropout duty cycle, and side-wettable 20-pin TQFN package optimized for thermal and EMI performance in space-constrained automotive modules.
Technical Context
The MAX20079DATP/VY+T implements a current-mode control architecture with internal slope compensation, eliminating external compensation components. Its 2.1MHz/400kHz fixed-frequency operation enables small external inductors (2.2μH or 10μH) and ceramic capacitors while avoiding AM-band interference.
It integrates dual N-channel MOSFETs with 70mΩ typical RDS(on) for both high-side and low-side switches, features programmable spread-spectrum modulation via the SPS pin (±3%), and uses a symmetrical 4mm × 4mm SWTQFN layout to cancel magnetic fields and reduce radiated EMI - critical for compliance in automotive EMC testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5A continuous - sufficient to power microcontrollers, CAN transceivers, and sensor interfaces in automotive body control modules. |
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and load-dump (40V transient) conditions per ISO 7637-2 without external protection. |
| Quiescent Current | 3.5μA at no load - extends battery life in always-on vehicle systems such as telematics and alarm controllers. |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ) - 2.1MHz enables <2.5mm height solutions; 400kHz maximizes efficiency at full load. |
| Output Voltage Accuracy | ±2% over 6V–18V input - ensures stable supply to sensitive analog sensors and ADC references under varying battery conditions. |
| Minimum On-Time | 65ns (typ) - enables 12V-to-1.8V conversion at 2.1MHz without pulse-skipping, maintaining regulation in high-ratio applications. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - prevents latch-up during sustained overload in sealed junction boxes or engine compartments. |
Pinout & Package
The MAX20079DATP/VY+T is housed in a 4mm × 4mm, 20-pin Side-Wettable TQFN (SWTQFN) package with exposed thermal pad. This RoHS-compliant package supports automated optical inspection (AOI) of solder joints and provides low θJA = 33°C/W on a 4-layer board for reliable operation at +125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Accepts 3.3V logic or direct battery connection (up to +40V); no internal pullup/pulldown minimizes standby leakage. |
| BST | Bootstrap capacitor node | Requires 0.1μF ceramic capacitor to LX; enables gate drive for integrated high-side MOSFET. |
| SUP (pins 4,5,11) | Main power input | Dual-supply path reduces input ripple current; each SUP pin must be decoupled with 4.7μF ceramic capacitor. |
| LX (pins 8,9) | Switching node | Connects to inductor; internal clamp diodes to PGND/AGND require careful layout to avoid exceeding power dissipation limits. |
| FB | Feedback reference input | 1.0V ±1.5% internal reference; connects to resistor divider for 3V–12V adjustment or to BIAS for fixed 3.3V/5V outputs. |
| BIAS | Internal 5V bias regulator output | Supplies internal circuitry and serves as pullup source for PGOOD; requires ≥1μF ceramic capacitor to AGND. |
| PGOOD | Open-drain power-good signal | Active-high flag asserting when VOUT is within 92–95% of target - used for sequencing with MCU reset or downstream LDOs. |
| SYNC | Mode control / synchronization input | Ground or floating → skip mode; tied to BIAS → forced PWM; accepts external clock (325–500kHz or 1.7–2.6MHz). |
| SPS | Spread-spectrum enable | Logic-high enables ±3% frequency dithering to reduce peak EMI emissions; internal 1MΩ pulldown ensures default disable. |
| PGND / AGND (pins 7,10,12) | Power and analog ground returns | Must be connected directly to exposed thermal pad; separate routing prevents noise coupling into feedback and soft-start circuits. |
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 >30% vs discrete solutions. |
| AEC-Q100 Grade-1 qualification | Validated for -40°C to +125°C ambient operation with 95,000-hour lifetime at TJ = +125°C - meets OEM requirements for powertrain and chassis modules. |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS - simplifies front-end protection design in 12V/24V vehicle architectures. |
| 99% maximum duty cycle | Enables dropout operation down to VIN = VOUT + 0.3V - maintains regulated output during cranking in start-stop systems. |
| Side-wettable TQFN package | Facilitates AOI and X-ray inspection of solder joints - improves manufacturing yield and field reliability in high-volume automotive production. |
| Programmable soft-start (3.5ms/5.5ms) | Prevents inrush current during power-up - avoids brownout on shared rails and eliminates need for external timing components. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in a 12V-powered head unit with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator supplying core logic and I/O domains; synchronized to system clock via SYNC pin. Use Value: 2.1MHz operation allows use of 2.2μH inductor and 35μF total output capacitance - achieving <6mm² solution size and passing CISPR-25 Class 5 radiated emissions. |
Use Scenario: Supplies image sensor and ISP in a rear-view camera module mounted near exhaust or engine bay. IC Role / Device Role / Timing Role: High-efficiency 3.3V rail generator operating in forced-PWM mode to suppress switching noise near analog video paths. Use Value: 400kHz option delivers >92% peak efficiency at 2.5A, while 99% dropout capability sustains output during 6V cold-crank events. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
|
Use Scenario: Powers microcontroller, LIN transceivers, and LED drivers in a centralized door module with always-on wake-up capability. IC Role / Device Role / Timing Role: Standby-mode regulator with 3.5μA IQ, enabled via CAN-inhibit signal on EN pin. Use Value: Ultra-low quiescent current extends battery life beyond 120 days in sleep mode - meeting OEM parasitic drain specifications. |
Use Scenario: Provides 5V rail to cellular modem, GNSS receiver, and secure element in a connected vehicle gateway. IC Role / Device Role / Timing Role: Input-filtered buck stage accepting wide-range 9–16V battery input with integrated PGOOD sequencing to modem reset. Use Value: 40V load-dump tolerance and AEC-Q100 qualification eliminate need for external TVS and re-qualification for Tier 1 integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 3.6A output, 3.5V–36V input, 15μA IQ, 2.1MHz fixed, no spread spectrum, QFN-16 package | Lacks AEC-Q100 qualification and 40V load-dump rating; suitable for industrial but not automotive safety-critical use | Select when cost sensitivity outweighs automotive qualification needs and EMI margin is adequate without spread spectrum. |
| TPS54560QDDARQ1 | 5A output, 3.5V–60V input, 14μA IQ, 100kHz–2.5MHz adjustable frequency, SOIC-8 package | Higher max input voltage but larger footprint and lower efficiency at light loads; no side-wettable leads for AOI | Prefer for ultra-wide VIN applications (>36V) where PCB area and automated inspection are secondary to voltage range. |
Compared with LM61480RQWR and TPS54560QDDARQ1, the MAX20079DATP/VY+T uniquely combines AEC-Q100 Grade-1, 40V load-dump tolerance, 3.5μA IQ, and side-wettable 20-pin TQFN - making it the only choice for space-constrained, EMC-sensitive automotive modules requiring zero-layout rework for production validation.
Availability
MAX20079DATP/VY+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, body control units, and telematics systems requiring stable component supply across multi-year vehicle production cycles.
Supply support for MAX20079DATP/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 connectivity solutions.
The MAX20079DATP/VY+T belongs to Analog Devices' automotive power management portfolio, engineered specifically for demanding 12V/24V vehicle subsystems requiring ultra-low IQ, high VIN tolerance, and robust EMC performance without external complexity.
FAQ
What is the recommended input capacitor configuration for MAX20079DATP/VY+T?
The MAX20079DATP/VY+T requires two 4.7μF ceramic capacitors - one on each of the dual SUP pins (pins 4 and 5), placed symmetrically adjacent to the IC. This layout minimizes high-frequency loop area and leverages the device's symmetrical pinout to cancel magnetic fields. A third 4.7μF low-ESR ceramic capacitor should connect SUP (pin 11) to PGND. All capacitors must be X7R/X5R dielectric, rated ≥16V, and placed within 2mm of their respective SUP pins to ensure stable operation under load dump and cold-crank conditions.
Does MAX20079DATP/VY+T support external frequency synchronization?
Yes, MAX20079DATP/VY+T supports external synchronization via the SYNC pin. When driven with a clean clock signal - 325–500kHz for 400kHz operation or 1.7–2.6MHz for 2.1MHz operation - the device locks to the external frequency with minimal jitter. This enables deterministic EMI reduction in multi-rail systems and eliminates beat frequencies between switching regulators. The internal oscillator remains active but is overridden; spread-spectrum modulation is disabled during external sync.
How is output voltage set for non-standard values like 3.395V on MAX20079DATP/VY+T?
MAX20079DATP/VY+T achieves 3.395V output using an external resistor divider from OUT to FB to AGND, with FB referenced to the internal 1.0V bandgap. Using RFB2 = 100kΩ (FB-to-AGND), RFB1 (OUT-to-FB) is calculated as 239.5kΩ via RFB1 = RFB2 × ((VOUT/1.0V) − 1). This configuration is validated in the datasheet's Electrical Characteristics table and maintains ±2% accuracy across temperature and line/load conditions - matching factory-trimmed 3.3V/5V variants.
What thermal derating applies to MAX20079DATP/VY+T at +105°C ambient?
At +105°C ambient on a 4-layer PCB, MAX20079DATP/VY+T delivers 2.8A continuous output before reaching its +150°C junction limit - a 20% derating from its 3.5A rating at +70°C. This is calculated using θJA = 33°C/W: ΔT = 150°C − 105°C = 45°C → PDISS = 45°C / 33°C/W = 1.36W. With typical 90% efficiency at 12V→5V, this supports ~2.8A output. Layout with ≥4 thermal vias under the exposed pad and 2oz copper on inner layers restores full 3.5A capability.
Can MAX20079DATP/VY+T operate with only one SUP pin connected?
No - MAX20079DATP/VY+T requires all three SUP pins (4, 5, 11) to be connected to the input supply rail. The dual-SUP architecture distributes high di/dt input current across parallel paths, reducing EMI and voltage drop. Omitting any SUP pin causes localized overheating, violates the absolute maximum rating for individual pin current, and risks premature failure due to uneven current sharing and thermal stress on internal bond wires. All three pins must be routed with equal-length, low-inductance traces to a common bulk capacitor node.
MAX20079DATP/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-SWTQFN (4x4)
MAX20079DATP/VY+T FAQ
1.How can I place an order for MAX20079DATP/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079DATP/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 MAX20079DATP/VY+T reliable?
The price and inventory of MAX20079DATP/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 MAX20079DATP/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20079DATP/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079DATP/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079DATP/VY+T?
MAX20079DATP/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079DATP/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 MAX20079DATP/VY+T?
For technical support, including MAX20079DATP/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079DATP/VY+T requirements.
6.How does Aetrix verify that MAX20079DATP/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20079DATP/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 MAX20079DATP/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20079DATP/VY+T?
All MAX20079DATP/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079DATP/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 MAX20079DATP/VY+T part is unused and in its original packaging.
Return procedure for MAX20079DATP/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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