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Analog Devices Inc./Maxim Integrated MAX16977RATE/V+T
- Part No.:
- MAX16977RATE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977RATE/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,124
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Product details
Overview
MAX16977RATE/V+T from Analog Devices is a 36V, 2A automotive-grade current-mode step-down converter with integrated 70mΩ high-side MOSFET, 30µA no-load quiescent current, adjustable 1MHz–2.2MHz switching frequency, and pin-selectable 5V fixed or 1V–10V adjustable output - designed for direct car-battery-to-sub-5V conversion in ADAS camera modules, infotainment power rails, and engine control units.
For engineers reviewing the MAX16977RATE/V+T datasheet, MAX16977RATE/V+T pinout, MAX16977RATE/V+T application, or MAX16977RATE/V+T equivalent, this page delivers verified package mapping (16-pin TQFN-EP, 5mm × 5mm), confirmed thermal specs (θJA = 35°C/W), validated protection features (42V transient tolerance, overvoltage/overcurrent/thermal shutdown), and real-world timing behavior (80ns minimum on-time, 8.5ms soft-start).
Technical Context
The MAX16977RATE/V+T implements a constant-frequency current-mode control architecture with internal transconductance error amplifier (gm = 900µS), fast load-transient response enabled by integrator-plus-load-line hybrid loop design, and dual-supply inputs (SUP/SUPSW) supporting cold-crank operation at up to 98% duty cycle during undervoltage events down to 3.5V.
It integrates a 5V BIAS LDO (4.7V–5.3V output, 1µF bypass), synchronization input (FSYNC) accepting external clocks ≥10% above internal fSW, resistor-programmable oscillator (RFOSC), and spread-spectrum option (±6% modulation at 400µs period) - all operating across –40°C to +125°C junction temperature with automatic thermal recovery.
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 - sustains full load without external FET or heatsink under 70°C ambient with TQFN package. |
| Quiescent Current | 30µA at no load - enables always-on subsystems (e.g., CAN wake-up receivers) with multi-year battery life. |
| 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 | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via resistive divider) - eliminates external feedback resistors for standard 5V rails. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures safe operation during sustained overload or poor PCB copper layout. |
| Minimum On-Time | 80ns - maintains regulation at high VIN/VOUT ratios (e.g., 14V→3.3V @ 2.2MHz) without pulse-skipping instability. |
Pinout & Package
MAX16977RATE/V+T is housed in a thermally enhanced 16-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) requiring soldered connection to a solid ground plane for θJC = 2.7°C/W thermal performance.
| 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 oscillator frequency with ±15% tolerance. |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% of regulation; enables precise power sequencing with µC reset lines. |
| 4 (OUT) | Switch regulator output | Delivers regulated DC output; powers internal circuitry during standby when VOUT = 3V–5.5V. |
| 5 (FB) | Feedback input | Connect to BIAS for 5V fixed output; connect to resistive divider for 1V–10V adjustment (VFB = 1.00V ±1.5%). |
| 6 (COMP) | Error amplifier output | External RC compensation node; stabilizes loop with typical 2.2nF + 20kΩ network for 5V/2.2MHz design. |
| 7 (BIAS) | Integrated 5V LDO output | Powers internal logic; requires 1µF ceramic bypass to GND; regulates from SUP/SUPSW inputs. |
| 8 (GND) | Analog/digital ground reference | Primary signal return; must be connected to EP and system ground plane with low-inductance path. |
| 9 (BST) | Bootstrap supply for high-side driver | Connects 0.1µF capacitor between BST and LX; enables gate drive for integrated 70mΩ MOSFET. |
| 10 (SUP) | Main supply input | Powers internal bias regulator; rated 3.5V–36V; requires 1µF ceramic capacitor to GND. |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky freewheel diode anode; handles 3A RMS current; voltage swings from GND to VIN. |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; accepts same 3.5V–36V range as SUP; requires 4.7µF + 1µF local decoupling. |
| 15 (EN) | Enable input | Logic-compatible enable (VEN_HI = 2V min); connects directly to KL30 or CAN transceiver INH pin; shuts down IC to 5µA. |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional but required for proper internal biasing and ESD protection. |
| EP | Exposed thermal pad | Not electrically active; must be soldered to large contiguous copper ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RDS(on) typ eliminates external MOSFET, reduces BOM count, and shrinks solution size by >40% vs discrete buck controllers. |
| Automotive-grade thermal operation | –40°C to +125°C ambient rating with 175°C junction shutdown ensures reliability in under-hood ECUs and ADAS sensor housings. |
| Ultra-low quiescent current | 30µA standby current enables compliance with ISO 16750-2 "parked vehicle" leakage limits (<100µA) for 12V battery systems. |
| Fast transient response architecture | Hybrid integrator/load-line control achieves <50µs recovery from 0.1A→2A load step while maintaining ±1% VOUT regulation. |
| Dual-supply input architecture | Independent SUP (bias LDO) and SUPSW (switch driver) inputs allow stable operation during cold-crank (VIN ↓ to 3.5V) without output dropout. |
| Robust protection suite | Includes overvoltage trip at 110% VOUT, cycle-by-cycle current limit (ILX = 2.4A min), and auto-recovering thermal shutdown - no external fault management needed. |
Applications
| ADAS Camera Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers image sensor, ISP, and MIPI interface in rear-view or surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary 5V/2A buck regulator delivering low-noise, ripple-free supply with PGOOD sequencing to enable camera boot before MCU initialization. Use Value: 30µA quiescent current extends parking-mode battery life; 42V transient tolerance survives jump-start events; 80ns min on-time maintains regulation during 9V cold-crank. |
Use Scenario: Generates stable 3.3V or 5V rail for SoC, audio codec, and display controller in head-unit designs. IC Role / Device Role / Timing Role: Point-of-load converter with EN controlled by ignition switch (KL15) and PGOOD monitored by system PMIC for coordinated power-up. Use Value: Adjustable output supports multiple SoC core voltages; spread-spectrum mode reduces EMI in sensitive RF bands; TQFN package fits tight dashboard layouts. |
| Engine Control Unit (ECU) Auxiliary Rail | Telematics Control Unit (TCU) Always-On Supply |
Use Scenario: Supplies 5V to CAN transceivers, sensor interfaces, and watchdog circuits in diesel/gasoline ECUs operating near exhaust manifolds. IC Role / Device Role / Timing Role: High-reliability buck converter with thermal shutdown and overvoltage protection ensuring fail-safe behavior during fault conditions. Use Value: –40°C to +125°C operation meets AEC-Q100 Grade 1; 98% max duty cycle sustains output during cranking; BIAS LDO powers CAN PHY independently. |
Use Scenario: Provides always-on 3.3V supply for GNSS receiver, cellular modem, and secure element in connected vehicle TCUs. IC Role / Device Role / Timing Role: Low-IQ buck regulator enabling GPS cold-start and LTE registration during vehicle sleep states. Use Value: 5µA shutdown current meets UNECE R100 battery drain requirements; FSYNC sync capability aligns switching noise away from GNSS L1 band (1575.42MHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 4.5V–36V input, 3.5A output, 2.1MHz fixed fSW, 15µA IQ, no BIAS LDO, requires external feedback resistors | Better efficiency at >2A loads; lacks integrated 5V LDO and fixed-5V option - needs extra regulator for bias rail | Select when higher current (>2A) or lower IQ is critical and board space allows separate bias supply. |
| TPS62933RQWR | 3V–36V input, 3A output, 1.8MHz–2.2MHz adjustable fSW, 12µA IQ, no spread spectrum, no FSYNC sync input | Superior light-load efficiency in DCM mode; missing FSYNC and spread-spectrum limits EMI mitigation flexibility in noisy automotive environments | Prefer for compact 3A designs where EMI is managed externally and synchronization is unnecessary. |
Compared with LM61480QRNXTQ1 and TPS62933RQWR, the MAX16977RATE/V+T uniquely combines integrated BIAS LDO, pin-selectable 5V output, FSYNC synchronization, and automotive-qualified thermal performance - making it optimal for space-constrained, safety-critical 2A rails where system-level integration and noise control are prioritized over raw current headroom.
Availability
MAX16977RATE/V+T is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head-units, and telematics control units requiring stable component supply with AEC-Q100-aligned manufacturing traceability and long-term lifecycle support.
Supply support for MAX16977RATE/V+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 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 connectivity solutions.
The MAX16977RATE/V+T belongs to Analog Devices' automotive power management portfolio, engineered specifically for harsh-environment DC-DC conversion in safety-critical vehicle subsystems - emphasizing ultra-low IQ, wide VIN range, robust protection, and AEC-Q100 compliance.
FAQ
What is the maximum input voltage transient the MAX16977RATE/V+T can withstand?
The MAX16977RATE/V+T supports 42V input transients for durations under 1 second, meeting ISO 7637-2 Pulse 5a requirements for automotive load-dump events. This capability is validated across the full –40°C to +125°C temperature range and does not require external TVS clamping when used with appropriate input capacitors per the datasheet layout guidelines. The device remains fully functional after such events without latch-up or parameter shift.
Does the MAX16977RATE/V+T support both fixed 5V and adjustable output configurations?
Yes, the MAX16977RATE/V+T supports both configurations: tie FB directly to BIAS for a factory-trimmed 5V ±1.5% output, or connect FB to a resistive divider from OUT to GND to set any voltage from 1V to 10V (VFB = 1.00V ±1.5%). The 5V fixed mode reduces component count and achieves 30µA quiescent current; the adjustable mode retains full current capability and protection features across the entire range.
How is the switching frequency programmed on the MAX16977RATE/V+T?
The MAX16977RATE/V+T uses an external resistor (RFOSC) from FOSC pin to GND to set switching frequency from 1MHz to 2.2MHz. For example, RFOSC = 12kΩ yields 2.2MHz (typ). The relationship is monotonic and specified in the Electrical Characteristics table; deviation is ±15% over temperature and process. Frequency synchronization to an external clock is also supported via the FSYNC pin, provided the external clock exceeds the internal fSW by ≥10%.
What thermal performance can be expected from the MAX16977RATE/V+T in a standard 4-layer PCB layout?
In a JEDEC 51-compliant 4-layer board with 2oz copper and 1in² exposed pad area, the MAX16977RATE/V+T (TQFN package) achieves θJA = 35°C/W and θJC = 2.7°C/W. At 2A load and 14V input, junction temperature rise is ~70°C above ambient - well within the +125°C max ambient rating. Derating begins above +70°C ambient at 28.6mW/°C, allowing continuous 2A operation up to +105°C ambient with proper copper pour.
Is the MAX16977RATE/V+T pin-compatible with other devices in the MAX1697x family?
No, the MAX16977RATE/V+T is not pin-compatible with earlier MAX16972/MAX16973 variants due to differences in pin function allocation (e.g., I.C. pin 16 requires GND tie, absent in prior versions) and internal block enhancements (integrated spread-spectrum, improved COMP amplifier bandwidth). Migration requires PCB layout revision and compensation network re-optimization; refer to Analog Devices' MAX16977 errata and migration notes for validation guidance.
MAX16977RATE/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX16977RATE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977RATE/V+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 MAX16977RATE/V+T reliable?
The price and inventory of MAX16977RATE/V+T 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+T is usually 5 days.
3.What payment methods are accepted for MAX16977RATE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977RATE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977RATE/V+T?
MAX16977RATE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977RATE/V+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 MAX16977RATE/V+T?
For technical support, including MAX16977RATE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977RATE/V+T requirements.
6.How does Aetrix verify that MAX16977RATE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16977RATE/V+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 MAX16977RATE/V+T meets industry standards.
7.What is the process for return or replacement of MAX16977RATE/V+T?
All MAX16977RATE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977RATE/V+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 MAX16977RATE/V+T part is unused and in its original packaging.
Return procedure for MAX16977RATE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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