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Analog Devices Inc./Maxim Integrated MAX20079AATP/VY+T
- Part No.:
- MAX20079AATP/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079AATP/VY+T.pdf
- Description:
- IC REG BCK PROG/3V 3.5A 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,198
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Product details
Overview
MAX20079AATP/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 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 domain controllers.
For engineers reviewing the MAX20079AATP/VY+T datasheet, MAX20079AATP/VY+T pinout, MAX20079AATP/VY+T application, or MAX20079AATP/VY+T equivalent, key selection criteria include its 65ns minimum on-time for high VIN/VOUT ratios, 40V load-dump tolerance, PGOOD monitoring capability, and side-wettable 20-pin TQFN package optimized for automotive EMI compliance and thermal performance.
Technical Context
The MAX20079AATP/VY+T implements current-mode control with internal slope compensation, enabling stable operation without external compensation components. 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 (175°C), and overcurrent protection (4.7A peak limit). The device maintains regulation down to 99% duty cycle in dropout, with controlled error-amplifier clamping to limit output overshoot during VIN recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports cold-crank (3V) and load-dump (40V transient) conditions in automotive systems |
| Output Current | 3.5A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in ADAS modules |
| Quiescent Current | 3.5μA at no load - enables >10-year battery standby life in always-on vehicle subsystems |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ) - 2.1MHz enables compact 2.2μH inductors; 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 loads |
| Minimum On-Time | 65ns (typ) - allows 12V→1.2V conversion at 2.1MHz without pulse skipping |
| Package | 20-pin Side-Wettable TQFN (4mm × 4mm) - supports automated optical solder-joint inspection per IPC-A-610 |
Pinout & Package
The MAX20079AATP/VY+T is housed in a 20-pin Side-Wettable TQFN package (4mm × 4mm, outline 21-100318), featuring symmetrical SUP and PGND pin placement to minimize high-current loop area and improve EMI performance. Exposed thermal pad must be soldered to PCB ground plane for thermal management and noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Accepts 3.3V–36V logic; no internal pullup/pulldown - enables direct connection to automotive KEY/CAN inhibit signals |
| BST | Bootstrap capacitor node | Requires 0.1μF ceramic capacitor to LX; enables high-side gate drive above VIN during switching |
| SUP (Pins 4,5,11) | Main power input | Dual-path input routing reduces AC current loop area; requires 4.7μF ceramic bypass per SUP pin |
| LX (Pins 8,9) | Switching node | Connects to inductor; internal clamp diodes to PGND/AGND require careful layout to avoid exceeding θJA limits |
| FB | Feedback reference input | 1.0V (±1.5%) internal reference; connects to resistor divider for 3V–12V programming or to BIAS for fixed 3.3V/5V |
| BIAS | Internal 5V LDO output | Supplies internal circuitry and external pullups; requires ≥1μF ceramic capacitor to AGND |
| PGOOD | Open-drain power-good signal | Active-high, 92–95% VOUT threshold; requires external 10kΩ pullup for sequencing with downstream regulators |
| SYNC | Mode control input | Ground/floating = skip mode; tied to BIAS = forced PWM - enables dynamic EMI optimization during runtime |
| SPS | Spread-spectrum enable | Logic-high enables ±3% frequency modulation - reduces peak radiated emissions without affecting SYNC synchronization |
| PGND (Pins 7,10,16,19) | Power ground return | Multiple low-inductance paths to exposed thermal pad - critical for minimizing ground bounce in high-di/dt switching |
| AGND | Analog ground reference | Separate from PGND to isolate feedback and bias circuitry from high-current switching noise |
| OUT | Output voltage sense | Direct connection to output capacitor; bypassed to PGND with low-ESR ceramics to suppress high-frequency ripple |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET integration | 70mΩ (typ) RDS(on) for both high-side and low-side switches - eliminates external MOSFETs and reduces BOM count by 4+ components |
| Ultra-low IQ | 3.5μA standby current - extends battery life in always-on telematics and body-control modules beyond 10 years |
| Automotive robustness | 40V load-dump rating, -40°C to +125°C ambient operation, and AEC-Q100 Grade 1 qualification - meets ISO 7637-2 Pulse 5a requirements |
| EMI-optimized architecture | Side-wettable TQFN with symmetrical SUP/PGND layout + optional ±3% spread spectrum - achieves CISPR 25 Class 5 radiated emissions compliance without shielding |
| Flexible voltage configuration | Factory-trimmed 3.3V/5V outputs or resistor-divider programmable 3V–12V range - supports single-bom deployment across multiple vehicle ECUs |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module DC-DC |
|---|---|
Use Scenario: Powers 32-bit MCU, CAN transceiver, and analog sensor interface in gasoline/diesel engine control units exposed to under-hood temperatures and load-dump transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with PGOOD sequencing and 99% dropout operation during cranking. Use Value: Maintains MCU operation during 6V cold-crank events and survives 40V load-dump spikes without external TVS, reducing system cost by $0.35. |
Use Scenario: Supplies image signal processor (ISP) and MIPI serializer in front-facing ADAS cameras requiring low-noise, high-efficiency 1.2V/1.8V rails derived from 12V battery. IC Role / Device Role / Timing Role: Intermediate 5V buck stage feeding secondary low-noise LDOs; uses 2.1MHz switching to shrink inductor size below 3mm². Use Value: 65ns min-on-time enables direct 12V→1.2V conversion at 2.1MHz, eliminating cascaded regulation and improving overall efficiency by 8%. |
| Body Control Module (BCM) Subsystem | Infotainment Head Unit Core Logic |
Use Scenario: Powers door module microcontrollers and LIN transceivers in distributed body electronics with strict quiescent current budgets. IC Role / Device Role / Timing Role: Always-on 3.3V supply operating in skip mode at <5mA load; enters 3.5μA standby when system is asleep. Use Value: Enables >15-year battery life in parked vehicle scenarios while maintaining wake-on-LIN capability without external supervision. |
Use Scenario: Generates 5V rail for SoC core logic, DDR memory, and audio codecs in head units subject to AM-band EMI restrictions. IC Role / Device Role / Timing Role: Main 5V buck converter using 400kHz mode for peak efficiency and SPS-enabled spread spectrum to suppress narrowband emissions at 1.8MHz. Use Value: Passes CISPR 25 radiated emissions testing at 100cm without ferrite beads or metal shielding, reducing mechanical design complexity. |
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 | 4.5A output, 3.5V–36V input, 12μA IQ, 2.1MHz fixed frequency, no spread spectrum, QFN-16 package | Lacks PGOOD, SPS, and SYNC-controlled mode switching; requires external compensation | Choose when higher output current is needed and EMI flexibility is not required |
| TPS543B20RTWT | 3A output, 4.5V–18V input, 15μA IQ, 400kHz–2.2MHz adjustable frequency, PMBus interface, 17-pin QFN | Requires digital configuration; narrower input range excludes 24V industrial use; larger footprint | Choose when telemetry, margining, or dynamic frequency tuning via PMBus is essential |
Compared with LM61480QRNXTQ1 and TPS543B20RTWT, the MAX20079AATP/VY+T provides superior automotive qualification depth (AEC-Q100 Grade 1 vs. Grade 2), lowest quiescent current (3.5μA vs. ≥12μA), and unique EMI mitigation features (SPS + symmetrical layout) - making it optimal for cost-sensitive, space-constrained, and emissions-regulated automotive power nodes.
Availability
MAX20079AATP/VY+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera power, body control module subsystems, and infotainment head units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX20079AATP/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 MAX20079AATP/VY+T belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding under-hood and ADAS applications requiring ultra-low IQ, high input voltage tolerance, and AEC-Q100 compliance.
FAQ
What is the maximum input voltage the MAX20079AATP/VY+T can withstand during load-dump events?
The MAX20079AATP/VY+T is rated for 40V absolute maximum input voltage on the SUP pin, which directly supports ISO 7637-2 Pulse 5a load-dump transients common in 12V automotive systems. This rating is validated per AEC-Q100 stress testing and does not require external TVS diodes for standard load-dump protection. During such events, the device remains functional and resumes regulation once VIN returns within normal operating range.
Does the MAX20079AATP/VY+T support adjustable output voltages, and how is it configured?
Yes, the MAX20079AATP/VY+T supports output voltages from 3V to 12V using an external resistor divider connected between OUT, FB, and AGND. The internal feedback reference is precisely 1.0V (±1.5%), so RFB1 = RFB2 × (VOUT/1.0 − 1). For fixed 3.3V or 5V operation, FB is connected directly to the BIAS pin. The MAX20079AATP/VY+T datasheet specifies RFB2 ≤ 500kΩ to ensure stable regulation and low noise sensitivity.
How does the MAX20079AATP/VY+T achieve ultra-low quiescent current, and what is its impact on battery life?
The MAX20079AATP/VY+T achieves 3.5μA typical quiescent current through intelligent circuit partitioning: in skip mode, the internal high-voltage LDO is disabled and VBIAS is supplied from the output rail after soft-start completion. At loads below ~5mA, it enters a deep standby mode where non-essential blocks are powered down. This enables >10-year battery life in always-on vehicle subsystems such as telematics control units and smart junction boxes.
What package type does the MAX20079AATP/VY+T use, and why is it beneficial for automotive designs?
The MAX20079AATP/VY+T uses a 20-pin Side-Wettable TQFN package (4mm × 4mm, outline 21-100318) with an exposed thermal pad. Its side-wettable feature enables automated optical inspection (AOI) of solder joints per IPC-A-610, critical for automotive zero-defect manufacturing. The symmetrical pin layout - with dual SUP and multiple PGND pins - minimizes high-current loop area and improves EMI performance, helping meet stringent CISPR 25 Class 5 requirements without added shielding.
Can the MAX20079AATP/VY+T operate in dropout, and what is its minimum dropout voltage?
Yes, the MAX20079AATP/VY+T operates in dropout by achieving up to 99% duty cycle, allowing regulation even when input voltage drops near the output level. Its effective dropout voltage is approximately 200mV at 3.5A (calculated from RDS(on) × IOUT), enabling stable 5V output down to ~5.2V input. During dropout, the device periodically refreshes the BST capacitor with 200ns low-side pulses every 20μs, sustaining gate drive integrity without external intervention.
MAX20079AATP/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:
- 2.1MHz
- 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)
MAX20079AATP/VY+T FAQ
1.How can I place an order for MAX20079AATP/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079AATP/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 MAX20079AATP/VY+T reliable?
The price and inventory of MAX20079AATP/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 MAX20079AATP/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20079AATP/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079AATP/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079AATP/VY+T?
MAX20079AATP/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079AATP/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 MAX20079AATP/VY+T?
For technical support, including MAX20079AATP/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079AATP/VY+T requirements.
6.How does Aetrix verify that MAX20079AATP/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20079AATP/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 MAX20079AATP/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20079AATP/VY+T?
All MAX20079AATP/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079AATP/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 MAX20079AATP/VY+T part is unused and in its original packaging.
Return procedure for MAX20079AATP/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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