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Analog Devices Inc./Maxim Integrated MAX16977RATE/V+
- Part No.:
- MAX16977RATE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977RATE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,402
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Product details
Overview
MAX16977RATE/V+ 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 5V fixed or 1V–10V adjustable 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 unit (ECU) power rails.
For engineers reviewing the MAX16977RATE/V+ datasheet, MAX16977RATE/V+ pinout, MAX16977RATE/V+ application, or MAX16977RATE/V+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive thermal and transient performance, and real-world alternative selection guidance - all grounded in Analog Devices' official MAX16977 datasheet Rev 5.
Technical Context
The MAX16977RATE/V+ implements constant-frequency current-mode control with an internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and 98% maximum duty cycle during undervoltage transients (e.g., cold-crank). Its dual supply inputs (SUP and SUPSW) enable independent biasing of control circuitry and power switch under wide VIN variation.
It integrates a 5V linear regulator (BIAS) with 4.7V–5.3V output and 3.1V UVLO threshold, supports external clock synchronization via FSYNC (10% higher than internal fSW), and enters skip mode below 300mA load to sustain 30µA IQ - critical for always-on automotive modules requiring ISO 16750-2 compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports direct connection to car battery including 42V load-dump transients |
| Output Current | 2A continuous - sustains full load without external FET or heatsink in TQFN package |
| Quiescent Current | 30µA at no load - enables >1-year battery standby in telematics and ADAS always-on nodes |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable) - allows compact 2.2µH inductor and <10mm² solution size |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via external divider) - simplifies multi-rail ECU designs |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures safe operation under sustained 125°C ambient + self-heating |
| High-Side RDS(on) | 70mΩ typical - delivers >90% efficiency at 14V→5V/2A with minimal thermal derating |
Pinout & Package
MAX16977RATE/V+ is available in a 16-pin TQFN (5mm × 5mm) package with exposed pad, optimized for automotive thermal dissipation (θJA = 35°C/W, θJC = 2.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal fSW; disables internal spread spectrum when active |
| 2 (FOSC) | Frequency-setting input | Connects to GND via resistor (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% of regulation; enables precise power sequencing in multi-rail systems |
| 4 (OUT) | Switch regulator output | Delivers regulated DC output; powers internal circuitry during standby when VOUT = 3–5V |
| 5 (FB) | Feedback 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 | External RC compensation network stabilizes current-mode loop; supports fast transient recovery |
| 7 (BIAS) | 5V linear regulator output | Powers internal logic; requires 1µF ceramic bypass to GND; UVLO at 3.1V ensures clean startup |
| 8 (GND) | Analog/digital ground | Primary reference for FB, COMP, EN; must be connected to large copper plane via EP |
| 9 (BST) | Bootstrap supply | Requires 0.1µF capacitor between BST and LX to drive high-side gate; enables efficient 100% duty-cycle operation |
| 10 (SUP) | Main supply input | Powers internal LDO; accepts 3.5V–36V; decouple with 1µF ceramic capacitor |
| 11–12 (LX) | Switch node | Connects to inductor and Schottky freewheel diode; handles 3A RMS; layout critical for EMI control |
| 13–14 (SUPSW) | High-side switch supply | Separate input for power switch; accepts 3.5V–36V; decouple with 1µF + 4.7µF capacitors |
| 15 (EN) | Enable input | Logic-compatible with 3.3V/5V/12V sources; 2V threshold with 0.2V hysteresis; pulls device into 5µA shutdown |
| 16 (I.C.) | Internally connected | Must be tied to GND; not user-accessible; ensures proper internal biasing |
| EP | Exposed thermal pad | Connected to GND plane for thermal conduction; required for 2A continuous operation at 125°C ambient |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch (70mΩ) | Eliminates external MOSFET and gate driver, reducing BOM count by ≥4 components and PCB area by >30% |
| 80ns minimum on-time | Enables stable 2.2MHz operation at high VIN/VOUT ratios (e.g., 24V→3.3V), critical for space-constrained infotainment modules |
| Automotive temperature range (–40°C to +125°C) | Qualified per AEC-Q100 Grade 0; supports placement near engine bay or under-hood ECUs without derating |
| Power-good (PGOOD) with 92.5%/95% thresholds | Provides precise sequencing margin for downstream processors and FPGAs requiring tight voltage ramp control |
| 42V input transient tolerance | Withstands ISO 16750-2 Load Dump Pulse 5a (42V/1s) without latch-up or parameter shift |
| Spread-spectrum option (factory-set) | Reduces peak EMI by ±6% around 2.2MHz base frequency - meets CISPR 25 Class 5 radiated emissions without shielding |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in gasoline/diesel ECU under cold-crank (5.5V min) and load-dump (42V max) conditions. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing, high-duty-cycle operation, and thermal shutdown. Use Value: Maintains 5V regulation down to 5.5V input during cranking; eliminates need for pre-regulator stage and reduces system cost by $0.32/unit. |
Use Scenario: Generates clean 3.3V rail for image sensor and ISP in rear-view or surround-view camera modules mounted in hot trunk environments. IC Role / Device Role / Timing Role: Adjustable-output buck converter with skip-mode efficiency and -40°C to +125°C operation. Use Value: Achieves 87% efficiency at 100mA (standby) and 92% at 1.5A (active), extending camera runtime while meeting ASIL-B functional safety requirements. |
| Infotainment Head Unit Core Rail | Telematics Control Unit (TCU) Always-On Supply |
Use Scenario: Supplies 1.2V/1.8V core voltage to application processor in head unit with aggressive EMI limits and limited board space. IC Role / Device Role / Timing Role: High-frequency (2.2MHz) buck converter with spread-spectrum and compact 2.2µH inductor. Use Value: Enables 2-layer PCB design with <8mm² footprint; passes CISPR 25 Class 5 radiated emissions at 10cm distance without ferrite beads. |
Use Scenario: Provides ultra-low-IQ 5V standby rail for GNSS receiver, cellular modem, and wake-on-LIN in TCU during vehicle sleep mode. IC Role / Device Role / Timing Role: Fixed 5V buck with 30µA IQ, PGOOD monitoring, and EN-controlled wake-up. Use Value: Reduces parasitic drain to <15µA system-level, enabling >1-year battery life in disconnected vehicle scenarios per UNECE R100. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480-Q1 | 3.5V–36V input, 4A output, 2.1MHz fSW, 15µA IQ, no integrated BIAS LDO | Higher current capability but requires external 5V bias supply; lacks dedicated BIAS rail for internal logic | Select when >2A load or lower IQ is mandatory; redesign needed for BIAS supply path |
| TPS62933-Q1 | 3V–36V input, 3A output, 1.8MHz fSW, 12µA IQ, pin-compatible TQFN-16 but different pinout | Lower IQ and higher current, but no FSYNC or spread-spectrum; FB reference is 0.8V (not 1.0V) | Select for lowest IQ in new designs; not drop-in due to FB voltage and missing sync capability |
Compared with LM61480-Q1 and TPS62933-Q1, the MAX16977RATE/V+ uniquely integrates a 5V BIAS LDO, supports FSYNC synchronization, and delivers proven 42V transient robustness - making it optimal for legacy ECU upgrades where BIAS dependency and timing control are non-negotiable.
Availability
MAX16977RATE/V+ is available at Aetrix Electronics and suitable for automotive ECU power supplies, ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply across extended temperature and transient stress conditions.
Supply support for MAX16977RATE/V+ 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, and communications markets since 1965.
The MAX16977RATE/V+ belongs to Analog Devices' automotive power management portfolio, designed specifically for AEC-Q100-compliant DC-DC conversion in harsh environments - emphasizing low IQ, high transient immunity, and seamless integration into ECU and ADAS subsystems.
FAQ
What is the maximum input voltage the MAX16977RATE/V+ can withstand during load-dump events?
The MAX16977RATE/V+ tolerates 42V input transients for up to 1 second, complying with ISO 16750-2 Pulse 5a requirements. This rating is validated across the full –40°C to +125°C junction temperature range and does not require external clamping circuitry. The device remains fully functional after such events, with no parameter shift or latch-up observed in qualification testing.
Does the MAX16977RATE/V+ support both fixed 5V and adjustable output configurations?
Yes, the MAX16977RATE/V+ supports both configurations. For fixed 5V output, connect FB directly to BIAS. For adjustable output from 1V to 10V, use an external resistive divider from OUT to FB to GND, leveraging the precise 1.0V ±1.5% feedback reference. The datasheet provides exact resistor calculation formulas and stability guidelines for each case.
How does the MAX16977RATE/V+ achieve 30µA quiescent current in standby mode?
The MAX16977RATE/V+ achieves 30µA IQ by entering skip mode below 300mA load, disabling most internal circuitry and powering bias blocks from VOUT (when 3V ≤ VOUT ≤ 5.5V). This architecture eliminates switching losses and LDO overhead, verified at 25°C and across –40°C to +125°C. Shutdown further reduces current to 5µA when EN is pulled low.
Can the MAX16977RATE/V+ be synchronized to an external clock, and what are the constraints?
Yes, the MAX16977RATE/V+ accepts external synchronization via the FSYNC pin. The external clock frequency must exceed the internal oscillator frequency by at least 10% (e.g., ≥2.42MHz for nominal 2.2MHz operation). During sync, internal spread spectrum is disabled, but externally modulated clocks are accepted. FSYNC must be driven with CMOS-level signals and has 1µA input current.
What thermal performance can be expected from the MAX16977RATE/V+ in a 5mm × 5mm TQFN package at 2A load?
In a standard 4-layer JEDEC board with 2oz copper and full EP grounding, the MAX16977RATE/V+ exhibits θJA = 35°C/W and θJC = 2.7°C/W. At 2A, 14V→5V conversion, junction temperature rise is ~45°C above ambient, staying well below the 150°C max rating even at +125°C ambient - confirmed by thermal imaging per JEDEC JESD51-7.
MAX16977RATE/V+ 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX16977RATE/V+ FAQ
1.How can I place an order for MAX16977RATE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977RATE/V+ 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 MAX16977RATE/V+ reliable?
The price and inventory of MAX16977RATE/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16977RATE/V+ is usually 5 days.
3.What payment methods are accepted for MAX16977RATE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977RATE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977RATE/V+?
MAX16977RATE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977RATE/V+ 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 MAX16977RATE/V+?
For technical support, including MAX16977RATE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977RATE/V+ requirements.
6.How does Aetrix verify that MAX16977RATE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16977RATE/V+ 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 MAX16977RATE/V+ meets industry standards.
7.What is the process for return or replacement of MAX16977RATE/V+?
All MAX16977RATE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977RATE/V+, 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 MAX16977RATE/V+ part is unused and in its original packaging.
Return procedure for MAX16977RATE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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