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Analog Devices Inc./Maxim Integrated MAX20079BATP/VY+T
- Part No.:
- MAX20079BATP/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079BATP/VY+T.pdf
- Description:
- IC REG BUCK PROG/3V 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,419
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Product details
Overview
MAX20079BATP/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 MAX20079BATP/VY+T datasheet, MAX20079BATP/VY+T pinout, MAX20079BATP/VY+T application, or MAX20079BATP/VY+T equivalent, key selection considerations include its 65ns minimum on-time for high VIN/VOUT ratios, 99% dropout duty cycle, 40V load-dump protection, and side-wettable 20-pin TQFN package optimized for EMI-sensitive automotive systems.
Technical Context
The MAX20079BATP/VY+T implements current-mode control with internal slope compensation, enabling stable operation without external compensation. Its dual-frequency architecture supports either 2.1MHz (for compact size and AM-band immunity) or 400kHz (for peak efficiency), selected via SYNC pin state or external clock injection.
It integrates a 5V BIAS LDO, PGOOD monitoring with 92–95% threshold hysteresis, spread-spectrum modulation (±3%) via SPS pin, and thermal shutdown at 175°C with 15°C hysteresis. The device enters skip mode below ~600mA load and transitions to ultra-low-quiescent standby mode (<6μA) below 5mA, preserving battery life in always-on vehicle subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V continuous; withstands 40V transients - enables direct connection to automotive battery with no pre-regulator. |
| Output Current | Up to 3.5A DC - sufficient for powering microcontrollers, sensors, and communication ICs in ADAS ECUs. |
| Quiescent Current | 3.5μA typical at no load - extends battery runtime in parked-state applications like telematics and alarm systems. |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ) - selectable for size vs. efficiency trade-off; 2.1MHz allows <2.2μH inductors and 35μF output capacitance. |
| Output Voltage Accuracy | ±2% over +6V to +18V input - ensures reliable logic-level compliance for 3.3V/5V digital loads across temperature and line variation. |
| Minimum On-Time | 65ns (typ) - supports 12V→3.3V conversion at 2.1MHz without pulse-skipping instability. |
| Duty Cycle Max | 99% - maintains regulation during cold-crank (4.5V battery) or low-VIN conditions without dropout failure. |
Pinout & Package
The MAX20079BATP/VY+T uses a 4mm × 4mm, 20-pin side-wettable TQFN (SWTQFN) package with exposed thermal pad. Pin layout is symmetrical to minimize EMI loop area and enable balanced input capacitor placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Accepts 0–36V logic; no internal pullup/pulldown - enables direct connection to automotive KEY/CAN inhibit signals. |
| BST | Bootstrap supply for high-side gate driver | Requires 0.1μF ceramic capacitor to LX; enables efficient 100% duty-cycle operation in dropout. |
| SUP (Pins 4,5,11) | Main power input | Three dedicated pins reduce IR drop and improve EMI - each requires local 4.7μF ceramic bypass. |
| LX (Pins 8,9) | Switch node | Connects to inductor; internal clamp diodes to PGND/AGND/SUP - must avoid forward-biasing during layout. |
| FB | Feedback reference input | 1.0V ±1.5% reference - sets output via resistor divider (3V–12V) or connects to BIAS for fixed 3.3V/5V. |
| BIAS | Internal 5V bias supply | Powers internal circuitry; requires ≥1μF ceramic capacitor - also serves as PGOOD pullup source. |
| PGOOD | Open-drain power-good indicator | Active-high signal with 92–95% VOUT threshold - enables safe sequencing of downstream rails in multi-rail systems. |
| SYNC | Mode select / synchronization input | Ground = skip mode; BIAS = forced PWM - allows dynamic efficiency/EMI optimization during runtime. |
| SPS | Spread-spectrum enable | Logic-high enables ±3% frequency dither - reduces peak EMI emissions without affecting regulation. |
| PGND (Pins 7,10,16,19) | Power ground return | Four dedicated pins minimize ground bounce - must be tied directly to exposed thermal pad. |
| AGND | Analog ground reference | Separate from PGND to isolate noise-sensitive feedback path - connected to exposed pad via shortest trace. |
| OUT | Output voltage sense | Connects to output capacitor bank - bypassed with low-ESR ceramics to suppress high-frequency ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET integration | Eliminates external diode and reduces conduction losses - achieves >92% efficiency at 2A/12V→5V with 2.1MHz switching. |
| Side-wettable TQFN package | Enables automated optical solder-joint inspection - critical for zero-defect automotive manufacturing and field reliability. |
| AEC-Q100 Grade-1 qualification | Validated for -40°C to +125°C ambient operation - meets stringent automotive thermal and lifetime requirements (95,000h at TJ=125°C). |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS - reduces BOM count and board space in front-end power stages. |
| Programmable soft-start | Fixed 3.5ms (2.1MHz) or 5.5ms (400kHz) ramp - prevents inrush current and ensures monotonic startup in multi-load systems. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module Power |
|---|---|
Use Scenario: Powers 3.3V microcontroller, CAN transceiver, and analog sensor interface in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary 12V→3.3V buck regulator with PGOOD sequencing and cold-crank support. Use Value: 99% duty cycle sustains 3.3V output down to 4.5V battery; 3.5μA Iq minimizes parasitic drain during vehicle sleep mode. | Use Scenario: Supplies clean 5V rail to image sensor, ISP, and MIPI serializer in surround-view or forward-facing camera modules. IC Role / Device Role / Timing Role: Low-noise, EMI-optimized DC-DC stage placed near sensor head to avoid signal coupling. Use Value: 2.1MHz operation avoids AM band; symmetrical SUP/LX layout + spread spectrum reduces radiated emissions below CISPR 25 Class 5 limits. |
| Automotive Infotainment Head Unit | Body Control Module (BCM) Subsystem |
Use Scenario: Generates 5V for display controller, audio codec, and USB PHY in centralized infotainment systems. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter fed from 12V main rail. Use Value: 400kHz option maximizes efficiency at 3A–4A loads; PGOOD enables controlled reset of SoC during brownout recovery. | Use Scenario: Powers door module MCU, LIN transceivers, and LED drivers in distributed body electronics. IC Role / Device Role / Timing Role: Compact, robust point-of-load regulator tolerant of load-dump and jump-start events. Use Value: 40V absolute max rating and integrated protection eliminate need for external TVS/clamp diodes - reduces cost and footprint. |
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 | 4.5V–36V input, 5A output, 12μA Iq, 2.1MHz fixed, no spread spectrum | Higher current, higher quiescent current, no SPS pin - suited for non-EMI-critical 5A loads | Select when >3.5A output or simpler EMI requirements exist; not pin-compatible. |
| TPS62933QPWRQ1 | 3V–36V input, 3.5A output, 2.5μA Iq, 2.2MHz fixed, integrated ferrite-bead filter | Lower Iq, higher fSW tolerance, built-in EMI filter - better for ultra-low-power, high-EMI environments | Prefer for battery-backed modules needing <3μA standby; requires different layout due to integrated filter. |
Compared with LM61480QRNXTQ1 and TPS62933QPWRQ1, the MAX20079BATP/VY+T uniquely combines AEC-Q100 Grade-1 qualification, side-wettable TQFN for process control, 65ns min-on-time for wide VIN/VOUT ratios, and pin-enabled spread spectrum - making it optimal for safety-critical, EMI-constrained automotive domains where manufacturability and transient robustness are non-negotiable.
Availability
MAX20079BATP/VY+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera power, infotainment head units, and body control modules requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX20079BATP/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.
The MAX20079 product line delivers compact, AEC-Q100-qualified buck converters optimized for automotive power management - specifically engineered to replace discrete FET + controller solutions in ECU, ADAS, and infotainment subsystems.
FAQ
What is the maximum input voltage the MAX20079BATP/VY+T can withstand during load-dump events?
The MAX20079BATP/VY+T is rated for 40V absolute maximum input voltage and explicitly designed to survive ISO 7637-2 Pulse 5a load-dump transients without external protection components. This capability is verified per AEC-Q100 stress testing and eliminates the need for external TVS diodes in most automotive front-end designs, reducing BOM cost and PCB area. The 40V rating applies to the SUP pin under transient conditions lasting less than 1 second.
Does the MAX20079BATP/VY+T support both fixed and adjustable output voltages?
Yes, the MAX20079BATP/VY+T supports both configurations. For fixed outputs, connect FB directly to BIAS to select factory-trimmed 3.3V or 5V options. For adjustable outputs between 3V and 12V, use an external resistor divider from OUT to FB to AGND, where FB regulates to 1.0V ±1.5%. The device's 1.0V reference and low FB input current (0.02μA) ensure high accuracy and minimal divider power loss across temperature and line variations.
How does the MAX20079BATP/VY+T achieve ultra-low quiescent current in standby mode?
The MAX20079BATP/VY+T achieves 3.5μA typical quiescent current by entering skip mode at light loads (<600mA) and transitioning to deep standby mode below ~5mA. In standby, most internal circuitry-including the high-voltage LDO-is disabled, leaving only essential regulation blocks active. VBIAS is supplied from the output rail post-soft-start, further reducing supply current. This behavior is inherent to the MAX20079BATP/VY+T's architecture and is validated across -40°C to +125°C per AEC-Q100 requirements.
What package type and thermal performance does the MAX20079BATP/VY+T use?
The MAX20079BATP/VY+T uses a 4mm × 4mm, 20-pin side-wettable TQFN (SWTQFN) package with exposed thermal pad. On a four-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 multiple PGND/AGND/SUP pins enable low-inductance grounding and efficient heat spreading into internal copper planes, supporting continuous 3.5A operation at +125°C ambient when properly laid out per Analog Devices' guidelines.
Can the MAX20079BATP/VY+T operate in dropout, and what is its minimum dropout voltage?
Yes, the MAX20079BATP/VY+T operates in dropout by achieving up to 99% duty cycle, enabling regulation even when input voltage approaches output voltage. At 5V output, it maintains regulation down to ~5.05V input (100mV dropout) under full load. During cold-crank events, it sustains 3.3V output down to 4.5V input using adaptive timing and BST capacitor recharge cycles. Dropout behavior is fully characterized and guaranteed across -40°C to +125°C per the datasheet's recommended operating conditions.
MAX20079BATP/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 (3.3V)
- 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)
MAX20079BATP/VY+T FAQ
1.How can I place an order for MAX20079BATP/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079BATP/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 MAX20079BATP/VY+T reliable?
The price and inventory of MAX20079BATP/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 MAX20079BATP/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20079BATP/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079BATP/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079BATP/VY+T?
MAX20079BATP/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079BATP/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 MAX20079BATP/VY+T?
For technical support, including MAX20079BATP/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079BATP/VY+T requirements.
6.How does Aetrix verify that MAX20079BATP/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20079BATP/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 MAX20079BATP/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20079BATP/VY+T?
All MAX20079BATP/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079BATP/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 MAX20079BATP/VY+T part is unused and in its original packaging.
Return procedure for MAX20079BATP/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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