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Analog Devices Inc./Maxim Integrated MAX16977SATE+
- Part No.:
- MAX16977SATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977SATE+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
MAX16977SATE+ from Analog Devices is a 2A, current-mode, automotive-grade step-down converter with integrated 70mΩ high-side MOSFET, operating from 3.5V to 36V input and delivering fixed 5V or adjustable 1V–10V output. It features 30µA no-load quiescent current, 1MHz–2.2MHz resistor-programmable switching frequency, and operates across –40°C to +125°C for engine control units and ADAS power rails.
For engineers reviewing the MAX16977SATE+ datasheet, MAX16977SATE+ pinout, MAX16977SATE+ application, or MAX16977SATE+ equivalent, key selection criteria include its 42V transient tolerance, 98% max duty cycle during cold-crank, spread-spectrum EMI reduction, power-good monitoring, and dual-supply architecture (SUP/SUPSW) enabling robust operation in automotive battery environments.
Technical Context
The MAX16977SATE+ employs current-mode control with an internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and fast load-transient response enabled by integrator-plus-load-line loop architecture. Its dual-input supply (SUP powers bias LDO; SUPSW powers high-side switch) allows stable regulation down to 3.5V input while maintaining >95% efficiency at 2A/5V with 14V input.
It integrates thermal shutdown (+175°C trip, 15°C hysteresis), overvoltage protection (110% VFB trip), cycle-by-cycle current limiting (2.4A–4A LX limit), and skip-mode operation below 300mA load - all with automatic recovery. The FSYNC input accepts external clocks ≥10% above internal fSW, and spread spectrum (±6% at 400µs period) is factory-enabled in the S-version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports direct connection to automotive battery with 42V transient tolerance for load-dump survival. |
| Output Current | 2A continuous - delivers full rated current without external FET or heatsink in TQFN package at +70°C ambient. |
| Quiescent Current | 30µA at no load - enables always-on subsystems (e.g., CAN wake-up receivers) with minimal battery drain. |
| Switching Frequency | 1MHz to 2.2MHz - adjustable via RFOSC resistor; higher frequencies reduce inductor size (e.g., 2.2MHz enables 2.2µH) and output capacitance. |
| Output Voltage Options | Fixed 5V (via FB-to-BIAS tie) or 1V–10V adjustable (via external resistor divider) - simplifies BOM for multi-rail systems. |
| Thermal Protection | +175°C junction shutdown with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Power-Good Accuracy | 92.5%–97% VFB window - provides precise sequencing margin for downstream logic and microcontrollers. |
Pinout & Package
MAX16977SATE+ is available in 16-pin TSSOP (exposed pad) and 5mm × 5mm TQFN packages. Both use identical pin functions and require exposed pad soldering to GND for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | External clock sync input | Accepts clock ≥10% above internal fSW; disables internal spread spectrum when active. |
| 2 (FOSC) | Frequency-setting resistor node | Connects to GND via RFOSC (e.g., 12kΩ → 2.2MHz); sets switching frequency with ±5% tolerance. |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% VFB; deasserts high above 95% VFB - enables safe power sequencing. |
| 4 (OUT) | Regulated output node | Delivers up to 2A; supplies internal circuitry in standby when VOUT = 3V–5.5V. |
| 5 (FB) | Feedback reference input | Connect to BIAS for 5V fixed output; connect to resistive divider for 1V–10V adjustment (VFB = 1.0V ±1.5%). |
| 6 (COMP) | Error amplifier output | Interface for RC compensation network - stabilizes loop with typical 2.2nF + 20kΩ + 12pF network. |
| 7 (BIAS) | Integrated 5V LDO output | Powers internal circuitry; requires 1µF ceramic bypass to GND; regulated at 4.7V–5.3V across temperature. |
| 8 (GND) | Analog/digital ground reference | Primary return path; must be connected to large copper plane; EP pad is separate thermal path only. |
| 9 (BST) | Bootstrap capacitor node | Requires 0.1µF ceramic between BST and LX to drive high-side gate; critical for 100% duty-cycle capability. |
| 10 (SUP) | Main supply input | Powers internal bias LDO; accepts 3.5V–36V; requires 1µF ceramic to GND. |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky diode cathode; handles peak currents up to 3A RMS; layout-sensitive node. |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; accepts 3.5V–36V; requires 4.7µF + 1µF ceramic decoupling to GND. |
| 15 (EN) | Enable input | Logic-compatible with 3.3V/5V/12V sources; 2V threshold, 0.2V hysteresis; pulls device into 5µA shutdown when low. |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional - serves internal test/trim purpose only. |
| EP | Exposed thermal pad | Connected to GND plane for thermal dissipation; contributes to θJC = 2.7°C/W in TQFN; not electrically functional. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RDS(on) typ eliminates external FET, reduces footprint by >40% vs discrete solutions. |
| Automotive-grade thermal range | –40°C to +125°C operation with +175°C thermal shutdown ensures reliability in under-hood environments. |
| Ultra-low quiescent current | 30µA standby current enables >1-year battery life in always-on vehicle modules (e.g., telematics, alarm). |
| High-duty-cycle cold-crank support | 98% max duty cycle at 2.2MHz maintains 5V output during 3.5V battery dips - critical for start-stop systems. |
| EMI-optimized clocking | Spread-spectrum (±6%) and external synchronization reduce peak radiated emissions by >10dB in CISPR 25 Band C. |
| Robust fault protection suite | Auto-recovering OVP, OCP, OTP, and UVP prevent latch-up and field failures in harsh electrical environments. |
Applications
| Engine Control Unit (ECU) Power | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Powers 3.3V/1.8V rails for microcontrollers, CAN transceivers, and sensor interfaces in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Primary 5V intermediate rail converter; supplies BIAS LDO for downstream regulators and enables PGOOD-controlled sequencing. Use Value: Survives 42V load-dump transients and 3.5V cold-crank dips without brownout, ensuring uninterrupted ECU operation during engine start. |
Use Scenario: Supplies 5V rail to radar SoCs, camera ISPs, and Ethernet PHYs in front/rear ADAS modules. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator; uses skip mode to maintain <35µA sleep current during vehicle park mode. Use Value: 2.2MHz operation minimizes inductor size (2.2µH) and enables compact 2-layer PCB layout in space-constrained ADAS housings. |
| Infotainment Head Unit | Body Control Module (BCM) |
|
Use Scenario: Generates stable 5V for display controllers, audio codecs, and USB hubs in automotive infotainment systems. IC Role / Device Role / Timing Role: Main DC-DC stage feeding secondary LDOs; uses FSYNC to align switching edges with display pixel clock, reducing beat-frequency noise. Use Value: Spread-spectrum mode suppresses EMI coupling into sensitive analog audio paths, eliminating audible switching artifacts. |
Use Scenario: Powers door module MCUs, LIN transceivers, and LED drivers in centralized BCM architectures. IC Role / Device Role / Timing Role: Always-on buck converter with EN controlled by ignition switch; enters 5µA shutdown when vehicle is off. Use Value: 30µA standby current extends 12V battery life beyond ISO 16750-2 requirements for 30-day parking scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QPWPRQ1 | 3.5V–36V input, 4A output, 2.1MHz fixed fSW, 15µA IQ, no spread spectrum, different pinout (20-pin HTSSOP) | Better for higher-current loads (>2.5A); lacks FSYNC and programmable fSW - less flexible for EMI tuning. | Choose LM61480QPWPRQ1 when system needs >2A output and fixed-frequency simplicity outweighs EMI optimization needs. |
| TPS62933QPWRQ1 | 3V–36V input, 3A output, 2.2MHz fixed fSW, 12µA IQ, integrated compensation, no PGOOD or FSYNC | Higher integration (no COMP/RC needed), lower IQ, but no power-good signaling or clock sync - limits sequencing and noise control. | Choose TPS62933QPWRQ1 for cost-sensitive, space-constrained designs where PGOOD and EMI control are non-critical. |
Compared with LM61480QPWPRQ1 and TPS62933QPWRQ1, the MAX16977SATE+ uniquely combines programmable frequency, spread-spectrum, FSYNC, and PGOOD in a 2A solution - making it optimal for noise-sensitive, sequenced automotive subsystems requiring design flexibility.
Availability
MAX16977SATE+ is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera modules, infotainment head units, and body control modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX16977SATE+ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets since 1965.
The MAX16977SATE+ belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding 12V/24V battery-fed systems requiring high reliability, low IQ, and robust transient handling in engine bay and cabin environments.
FAQ
What is the maximum input voltage transient the MAX16977SATE+ can withstand?
The MAX16977SATE+ tolerates 42V input transients for durations under 1 second, complying with ISO 7637-2 Pulse 5a (load dump) requirements. This rating applies to both SUP and SUPSW pins, enabling direct connection to unclamped automotive battery rails without external TVS diodes in many implementations. The device remains fully functional after such events and resumes regulation automatically.
Does the MAX16977SATE+ support fixed 5V output without external resistors?
Yes, the MAX16977SATE+ supports fixed 5V output by connecting the FB pin directly to the BIAS pin - eliminating the need for external feedback resistors and reducing BOM count and board area. In this configuration, output voltage is tightly regulated at 4.925V–5.075V across line, load, and temperature, with 0.5% load regulation and 0.02%/V line regulation.
How does the MAX16977SATE+ achieve low quiescent current in standby mode?
The MAX16977SATE+ achieves 30µA standby current by entering skip mode at light loads (<300mA), where most internal circuitry (including the BIAS LDO) is powered from VOUT instead of SUP/SUPSW. When VOUT is 3V–5.5V, this architecture reduces total supply current to 30µA typical - verified across –40°C to +125°C - enabling compliance with automotive "always-on" battery drain specifications.
Can the MAX16977SATE+ operate with 100% duty cycle during undervoltage conditions?
The MAX16977SATE+ supports up to 98% duty cycle at 2.2MHz and 99% at 1MHz, enabling near-100% conduction during cold-crank events (e.g., 3.5V input). While true 100% is not achievable due to minimum off-time constraints, the 98% capability maintains regulated 5V output even at minimum input, outperforming many competitors limited to ≤90% duty cycle in high-frequency operation.
What package options are available for the MAX16977SATE+ and how do they differ thermally?
The MAX16977SATE+ is offered in 16-pin TSSOP (θJA = 38.3°C/W) and 5mm × 5mm TQFN (θJA = 35°C/W) packages, both with exposed thermal pads. The TQFN offers superior thermal performance - 3.3°C/W lower junction-to-ambient resistance - enabling 2A continuous operation at higher ambient temperatures (e.g., +85°C) without derating, while the TSSOP provides legacy compatibility for through-hole rework scenarios.
MAX16977SATE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX16977SATE+ FAQ
1.How can I place an order for MAX16977SATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SATE+ 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 MAX16977SATE+ reliable?
The price and inventory of MAX16977SATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16977SATE+ is usually 5 days.
3.What payment methods are accepted for MAX16977SATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SATE+?
MAX16977SATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SATE+ 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 MAX16977SATE+?
For technical support, including MAX16977SATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SATE+ requirements.
6.How does Aetrix verify that MAX16977SATE+ is sourced from the original manufacturer or authorized distributors?
All MAX16977SATE+ 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 MAX16977SATE+ meets industry standards.
7.What is the process for return or replacement of MAX16977SATE+?
All MAX16977SATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SATE+, 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 MAX16977SATE+ part is unused and in its original packaging.
Return procedure for MAX16977SATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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