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Analog Devices Inc./Maxim Integrated MAX20079BATP/VY+
- Part No.:
- MAX20079BATP/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079BATP/VY+.pdf
- Description:
- IC REG BUCK PROG/3V 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:538
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Product details
Overview
MAX20079BATP/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 3.5V–36V input range while consuming only 3.5μA quiescent current at no load. It features ±2% output voltage accuracy (within 6V–18V VIN), 65ns minimum on-time, and AEC-Q100 qualification for under-hood automotive power rails.
For engineers reviewing the MAX20079BATP/VY+ datasheet, MAX20079BATP/VY+ pinout, MAX20079BATP/VY+ application, or MAX20079BATP/VY+ equivalent, key selection considerations include its 2.1MHz/400kHz selectable switching frequency, 40V load-dump tolerance, 99% dropout duty cycle, spread-spectrum EMI reduction via SPS pin, and programmable 3V–12V output via external resistor divider.
Technical Context
The MAX20079BATP/VY+ employs current-mode control with internal slope compensation and fixed-frequency PWM or pulse-skipping operation-selected dynamically via SYNC pin state. Its 65ns minimum on-time enables high step-down ratios (e.g., 36V→3.3V), while the 99% maximum duty cycle supports ultra-low dropout regulation during cold-crank events.
It integrates a 5V BIAS LDO, PGOOD monitoring with 92–95% threshold hysteresis, thermal shutdown at 175°C (15°C hysteresis), and overcurrent protection with 4.7A (±12%) peak limit. The side-wettable 20-pin TQFN package (4mm × 4mm) uses symmetrical SUP/PGND/LX pin placement to minimize loop inductance and radiated EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; withstands 40V transients - supports 12V/24V automotive battery systems including load dump. |
| Output Current | Up to 3.5A DC - sufficient for powering ADAS sensors, infotainment SoCs, or body control modules. |
| 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) - selectable via part variant or SYNC pin; 2.1MHz enables <2.2μH inductor and compact layout. |
| Output Accuracy | ±2% over 6V–18V VIN and -40°C to +125°C - ensures stable MCU core voltage under wide ambient and supply variation. |
| Minimum On-Time | 65ns (typ) - allows direct 36V-to-3.3V conversion without pre-regulation, reducing BOM count. |
| Duty Cycle Range | Up to 99% - maintains regulation during 4.5V cold-crank conditions without external boost assist. |
Pinout & Package
MAX20079BATP/VY+ is housed in a 20-pin side-wettable TQFN package (4mm × 4mm, outline 21-100318), optimized for automotive thermal and EMI performance with exposed thermal pad soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Accepts 0–40V logic; enables direct connection to automotive KEY or CAN inhibit signals without level-shifting. |
| BST | Bootstrap capacitor node | Requires 0.1μF ceramic capacitor to LX; sustains gate drive for high-side FET during 99% duty-cycle operation. |
| SUP (Pins 4,5,11) | Main power input | Three dedicated pins reduce IR drop and high-frequency AC current loop area; each requires local 4.7μF ceramic decoupling. |
| LX (Pins 8,9) | Switching node | Connects to inductor; dual pins lower parasitic inductance and improve EMI by enabling symmetric layout. |
| FB | Feedback reference input | 1.0V (±1.5%) internal reference; connects to resistor divider for 3V–12V programmable output or to BIAS for fixed 3.3V/5V. |
| BIAS | Internal 5V LDO output | Powers internal circuitry and provides pullup for PGOOD; requires ≥1μF ceramic capacitor to AGND. |
| PGOOD | Open-drain power-good indicator | Active-high signal debounced for 60–110μs; asserts when VOUT reaches 93% of target - simplifies multi-rail sequencing. |
| SYNC | Mode select / synchronization input | Ground or floating = skip mode (efficiency); tied to BIAS = forced PWM (EMI control); accepts external clock up to 500kHz. |
| SPS | Spread-spectrum enable | Logic-high enables ±3% frequency modulation - reduces peak EMI emissions without affecting regulation stability. |
| PGND (Pins 7,10,16,19) | Power ground return | Four dedicated pins minimize ground bounce and thermal resistance; must be connected directly to exposed thermal pad. |
| AGND | Analog ground reference | Separate from PGND to isolate noise-sensitive feedback and oscillator circuits; connects to FB divider ground. |
| OUT | Output voltage sense | Direct connection to output rail; bypassed with low-ESR ceramic capacitors to suppress high-frequency ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated 70mΩ/70mΩ FETs | Eliminates external MOSFETs and drivers - reduces solution size to <120mm² and improves efficiency at full load. |
| 2.1MHz fixed-frequency option | Enables use of sub-2.2μH inductors and 1206/0805 ceramic capacitors - avoids large magnetics and electrolytics. |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a without external TVS - removes need for discrete clamp diodes in front-end design. |
| 99% duty-cycle dropout operation | Maintains regulated output down to 4.5V input - critical for engine start-stop and cold-crank reliability in 12V systems. |
| AEC-Q100 Grade 1 qualification (-40°C to +125°C) | Validated for under-hood deployment - includes HTOL, temperature cycling, and ESD testing per automotive standards. |
| Side-wettable TQFN with symmetrical pinout | Enables automated optical inspection (AOI) of solder joints and reduces radiated EMI via magnetic field cancellation. |
Applications
| ADAS Camera Power Supply | Automotive Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers 3.3V/5V image sensor and ISP in forward-facing camera module exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 12V battery to clean, low-noise core voltage with PGOOD sequencing. Use Value: 3.5μA quiescent current extends parking-mode battery life; 40V tolerance eliminates external TVS; 99% duty cycle prevents brownout during cranking. |
Use Scenario: Supplies 1.1V–1.3V core voltage to quad-core automotive infotainment processor with dynamic load steps. IC Role / Device Role / Timing Role: Pre-regulator stepping 12V down to 3.3V/5V, feeding downstream point-of-load converters. Use Value: 65ns min-on-time enables single-stage 12V→3.3V conversion; 2.1MHz switching minimizes output ripple for noise-sensitive video processing. |
| Body Control Module (BCM) Microcontroller Rail | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Provides 3.3V supply to ARM Cortex-M7 microcontroller in door module with CAN/LIN communication. IC Role / Device Role / Timing Role: Always-on system rail with EN controlled by vehicle wake-up signal; PGOOD monitors health. Use Value: AEC-Q100 Grade 1 rating ensures reliability at 125°C ambient; spread-spectrum (SPS) reduces EMI near CAN bus traces. |
Use Scenario: Powers torque and position sensors in EPS rack-and-pinion assembly subject to vibration and thermal shock. IC Role / Device Role / Timing Role: Isolated, low-noise auxiliary rail decoupled from main motor drive supply. Use Value: Dual PGND/AGND separation suppresses motor-switching noise coupling into analog sensor signals; 400kHz mode maximizes efficiency at steady load. |
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, 8A output, 15μA IQ, 2.1MHz fixed freq; no spread-spectrum; larger 16-pin WQFN (3mm × 4.5mm). | Higher current capacity but higher quiescent current - better suited for high-power domain controllers than ultra-low-IQ modules. | Select LM61480QRNXTQ1 when >5A output or tighter thermal margin is required; avoid if 3.5μA standby is mandatory. |
| TPS62933QPWPRQ1 | 3V–18V input, 3.5A output, 1.2μA IQ, 2.2MHz freq; no 40V tolerance; no load-dump protection; smaller 12-pin WSON (2mm × 3mm). | Ultra-low IQ advantage offset by narrower VIN range and lack of automotive transient robustness. | Select TPS62933QPWPRQ1 only for interior modules with stable 12V supply; not suitable for engine compartment or battery-input designs. |
Compared with LM61480QRNXTQ1 and TPS62933QPWPRQ1, MAX20079BATP/VY+ uniquely balances 3.5μA IQ, 40V load-dump tolerance, 99% dropout, and spread-spectrum EMI control in a compact 20-pin SWTQFN - making it optimal for space-constrained, safety-critical automotive subsystems requiring both efficiency and ruggedness.
Availability
MAX20079BATP/VY+ is available at Aetrix Electronics and suitable for automotive ADAS, body electronics, and infotainment systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for MAX20079BATP/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.
The MAX20079 product line delivers compact, AEC-Q100-qualified buck converters for automotive power rails where ultra-low quiescent current, high input voltage tolerance, and EMI robustness are essential - targeting next-generation E/E architectures with distributed power domains.
FAQ
What is the maximum input voltage the MAX20079BATP/VY+ can withstand without damage?
The MAX20079BATP/VY+ has an absolute maximum SUP rating of +40V, enabling reliable operation during ISO 7637-2 Load Dump Pulse 5a events common in 12V automotive systems. This rating is validated per AEC-Q100 stress testing and does not require external TVS clamping for standard automotive transients.
Does the MAX20079BATP/VY+ support adjustable output voltage, and how is it configured?
Yes, the MAX20079BATP/VY+ supports programmable output voltages from 3V to 12V using an external resistor divider connected between OUT, FB, and AGND. For fixed outputs, FB is tied to BIAS to select factory-trimmed 3.3V or 5V options. The internal FB reference is precisely 1.0V (±1.5%), ensuring tight regulation across temperature and line.
How does the MAX20079BATP/VY+ achieve ultra-low 3.5μA quiescent current?
The MAX20079BATP/VY+ achieves 3.5μA IQ through intelligent light-load management: it enters skip mode when peak inductor current falls below ~600mA, then disables the internal high-voltage LDO and powers bias circuitry from the output rail. At true no-load, only essential regulation circuitry remains active - verified across -40°C to +125°C.
What is the purpose of the SPS pin on the MAX20079BATP/VY+, and how is it used?
The SPS (Spread-Spectrum) pin on the MAX20079BATP/VY+ enables ±3% frequency modulation of the internal oscillator when pulled high, reducing peak radiated EMI emissions without affecting output regulation or efficiency. It is inactive when SYNC is driven externally, and requires no additional components beyond a logic-level enable signal.
Can the MAX20079BATP/VY+ operate in dropout, and what is its minimum operating input voltage?
Yes, the MAX20079BATP/VY+ operates in dropout with up to 99% duty cycle, maintaining regulation down to 4.5V input at 3.3V output. This is achieved by periodically refreshing the BST capacitor every 20μs during sustained high-duty operation - a feature validated for cold-crank conditions per ISO 16750-2.
MAX20079BATP/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 (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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-SWTQFN (4x4)
MAX20079BATP/VY+ FAQ
1.How can I place an order for MAX20079BATP/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079BATP/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 MAX20079BATP/VY+ reliable?
The price and inventory of MAX20079BATP/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20079BATP/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079BATP/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079BATP/VY+?
MAX20079BATP/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079BATP/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 MAX20079BATP/VY+?
For technical support, including MAX20079BATP/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079BATP/VY+ requirements.
6.How does Aetrix verify that MAX20079BATP/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20079BATP/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 MAX20079BATP/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20079BATP/VY+?
All MAX20079BATP/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079BATP/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 MAX20079BATP/VY+ part is unused and in its original packaging.
Return procedure for MAX20079BATP/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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