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Analog Devices Inc./Maxim Integrated MAX16977RAUE+T
- Part No.:
- MAX16977RAUE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977RAUE+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,414
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Product details
Overview
MAX16977RAUE+T from Analog Devices is a 2A, current-mode, automotive-grade step-down DC-DC 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) and ADAS power rail generation.
For engineers reviewing the MAX16977RAUE+T datasheet, MAX16977RAUE+T pinout, MAX16977RAUE+T application, or MAX16977RAUE+T equivalent, this page delivers verified package mapping (16-pin TSSOP), confirmed pin functions (e.g., FSYNC for clock sync, PGOOD for sequencing), thermal shutdown at +175°C, and real-world load-transient response data under cold-crank conditions.
Technical Context
The MAX16977RAUE+T implements constant-frequency current-mode control with an internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and 98% maximum duty cycle-enabling stable regulation during automotive undervoltage transients (e.g., 3.5V cold-crank). Its dual supply inputs (SUP and SUPSW) decouple bias and switch power paths, supporting independent voltage handling up to 42V transient tolerance.
It integrates a 5V linear regulator (BIAS) with 2.9V–3.3V UVLO hysteresis, a spread-spectrum option (±6% modulation at 400µs period), and skip-mode operation below 300mA load to achieve 30µA standby current. Synchronization via FSYNC accepts external clocks ≥10% above internal fSW, and soft-start is fixed at 8.5ms.
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 during load dump. |
| Output Current | 2A continuous - sustains full load without external FET; LX RMS current rating is 3A. |
| Quiescent Current | 30µA at no load - enables always-on ECU subsystems meeting OEM low-power requirements. |
| Switching Frequency | 1MHz to 2.2MHz - set by external RFOSC resistor; higher frequencies reduce inductor size (e.g., 2.2MHz enables 2.2µH). |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable - regulated to ±1.5% over line/load/temperature via 1.0V FB reference. |
| Thermal Protection | Shuts down at +175°C junction temperature with 15°C hysteresis - ensures safe recovery after overheating events. |
| Power-Good Accuracy | PGOOD asserts at 92.5% VFB, deasserts at 95% VFB - provides precise sequencing margin for downstream logic rails. |
Pinout & Package
MAX16977RAUE+T is packaged in a 16-pin TSSOP (exposed pad), with pin 1 marked by dot and pin 16 at top-right corner. Thermal performance relies on soldering the exposed pad (EP) to a large contiguous copper ground plane; EP is not a functional signal but mandatory for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal fSW; connect to GND for internal oscillator use. |
| 2 (FOSC) | Frequency-setting input | Resistor-to-GND sets fSW from 1MHz to 2.2MHz; 12kΩ yields 2.2MHz per datasheet. |
| 3 (PGOOD) | Open-drain power-good monitor | Active-low flag indicating VOUT within ±2.5% of regulation; enables safe power sequencing. |
| 4 (OUT) | Regulated output node | Delivers up to 2A; supplies internal circuitry when VOUT = 3V–5V in standby mode. |
| 5 (FB) | Feedback input | Connect to BIAS for 5V fixed output; connect resistive divider for 1V–10V adjustment (VFB = 1.0V). |
| 6 (COMP) | Error amplifier output | External RC compensation network stabilizes current-mode loop; gm = 900µS ensures fast transient response. |
| 7 (BIAS) | Internal LDO output | 5V ±3% linear regulator powering internal logic; requires 1µF ceramic bypass to GND. |
| 8 (GND) | Analog/digital ground reference | Primary return path; must be connected to EP and system ground with low-inductance layout. |
| 9 (BST) | Bootstrap supply for high-side driver | 0.1µF capacitor between BST and LX enables gate drive for integrated 70mΩ MOSFET. |
| 10 (SUP) | Main supply input | Powers internal bias circuitry; rated 3.5V–36V; requires 1µF ceramic capacitor to GND. |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky freewheeling diode; handles peak currents up to 4A. |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; separate from SUP to maintain regulation during cold-crank. |
| 15 (EN) | Enable input | Logic-compatible with 3.3V–36V; high enables converter; low forces 5µA shutdown current. |
| 16 (I.C.) | Internally connected | Must be tied to GND; not user-accessible; serves internal bias routing. |
| EP | Exposed thermal pad | Not electrically active; soldered to PCB ground plane for θJA = 38.3°C/W (TSSOP). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RDS(on) typ eliminates need for external FET, reducing BOM count and board area in space-constrained ECUs. |
| Automotive-grade thermal operation | –40°C to +125°C ambient range with +175°C thermal shutdown ensures reliability in under-hood environments. |
| Fast load-transient response | Current-mode architecture with optimized loop gain recovers from 1A step load in <100µs without overshoot >50mV. |
| Low-IQ skip mode | 30µA no-load current achieved by powering internal circuitry from VOUT during light-load skip cycles. |
| Robust protection suite | Includes overcurrent limit (ILX = 2.4–4A), overvoltage trip (110% VFB), and short-circuit tolerant output. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powers microcontroller, CAN transceiver, and sensors in gasoline/diesel ECU modules exposed to cold-crank (3.5V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing, EN controlled by KL15 ignition signal. Use Value: 98% max duty cycle maintains regulation at 3.5V input; 30µA IQ meets ISO 16750-2 sleep current limits. |
Use Scenario: Generates clean 3.3V rail for CMOS image sensor and ISP in forward-facing camera modules. IC Role / Device Role / Timing Role: Point-of-load converter with spread-spectrum EMI reduction enabled to pass CISPR-25 Class 5 radiated emissions. Use Value: 2.2MHz switching allows compact 2.2µH inductor and 22µF ceramic output cap; PGOOD coordinates sensor initialization timing. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
|
Use Scenario: Supplies isolated 5V logic rail for digital I/O expansion cards in factory automation systems with wide-input industrial power buses. IC Role / Device Role / Timing Role: Input-tolerant DC-DC stage accepting 12V–36V unregulated bus; synchronized to system clock via FSYNC. Use Value: 42V transient tolerance eliminates need for upstream TVS; adjustable output supports legacy 3.3V or 5V logic families. |
Use Scenario: Powers LTE modem, GNSS receiver, and secure MCU in vehicle telematics units requiring always-on connectivity. IC Role / Device Role / Timing Role: Always-on buck converter with EN driven by battery monitor IC; BIAS powers internal watchdog and RTC. Use Value: 5µA shutdown current extends backup battery life; thermal shutdown prevents failure during prolonged GPS jamming tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 3.5V–36V input, 8A output, 2.1MHz fixed fSW, no FSYNC, 15µA IQ | Higher current capacity; lacks clock sync and spread spectrum; smaller 3mm × 4mm QFN | Select LM61480RQR only if >2A load or minimal footprint is required; MAX16977RAUE+T preferred for EMI-sensitive ADAS due to FSYNC/spread-spectrum. |
| TPS54260DGQ | 3.5V–60V input, 2.5A output, 100kHz–2.5MHz adjustable fSW, no PGOOD, 138µA IQ | Wider VIN range; no power-good output; higher quiescent current limits always-on use | Choose TPS54260DGQ for industrial 48V systems; avoid in automotive sleep-mode applications where 30µA IQ is mandatory. |
Compared with LM61480RQR and TPS54260DGQ, the MAX16977RAUE+T uniquely combines automotive temperature grade, 30µA standby current, FSYNC capability, and integrated PGOOD-making it the only choice for OEM-compliant ECU and ADAS power designs requiring synchronized low-EMI operation.
Availability
MAX16977RAUE+T is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera modules, industrial PLC I/O, and telematics control units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX16977RAUE+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 power management semiconductors, serving automotive, industrial, and communications markets with robust, AEC-Q100 qualified components.
The MAX16977RAUE+T belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding 12V/24V battery-fed systems requiring ultra-low IQ, high transient immunity, and precise power sequencing.
FAQ
What is the maximum input voltage transient the MAX16977RAUE+T can withstand?
The MAX16977RAUE+T supports 42V input transients for durations under 1 second, as specified in its Absolute Maximum Ratings. This capability is validated for automotive load-dump conditions per ISO 7637-2 Pulse 5a, enabling direct connection to vehicle battery without additional transient suppression in most ECU designs. The device remains functional during the event and resumes regulation automatically once voltage returns within 3.5V–36V operating range.
Does the MAX16977RAUE+T require an external Schottky diode?
Yes, the MAX16977RAUE+T requires an external Schottky diode connected between LX and GND to serve as the freewheeling path. The datasheet specifies using a part like Diodes Inc. B360B-13-F (36V, 3A) placed close to the IC with short traces. No internal synchronous rectifier is present-this is a controller with integrated high-side switch only, not a fully synchronous buck.
Can the MAX16977RAUE+T operate with a 3.5V input during cold-crank conditions?
Yes, the MAX16977RAUE+T is explicitly designed for cold-crank operation down to 3.5V input. Its 98% maximum duty cycle at 2.2MHz and dual-supply architecture (SUP/SUPSW) maintain regulated 5V output even when input drops to 3.5V, as verified in Typical Operating Characteristics figure "UNDERTVOLTAGE PULSE". This behavior is critical for engine start-up in sub-zero environments.
How is the switching frequency set on the MAX16977RAUE+T?
The switching frequency of the MAX16977RAUE+T is set by an external resistor (RFOSC) connected from pin 2 (FOSC) to GND. A 12kΩ resistor yields 2.2MHz, while values from 10kΩ to 24kΩ scale fSW between 1MHz and 2.2MHz per the "SWITCHING FREQUENCY vs. RFOSC" graph. The internal oscillator is disabled when FSYNC receives a valid external clock signal.
What is the purpose of the I.C. pin (pin 16) on the MAX16977RAUE+T?
Pin 16 (I.C.) on the MAX16977RAUE+T is internally connected and must be tied to GND for proper operation. It is not a user-accessible signal or test point-it routes internal bias currents and ensures correct startup sequencing. Leaving it floating or connecting it to any other voltage violates the Absolute Maximum Ratings and may cause malfunction or damage.
MAX16977RAUE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16977RAUE+T FAQ
1.How can I place an order for MAX16977RAUE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977RAUE+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 MAX16977RAUE+T reliable?
The price and inventory of MAX16977RAUE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16977RAUE+T is usually 5 days.
3.What payment methods are accepted for MAX16977RAUE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977RAUE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977RAUE+T?
MAX16977RAUE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977RAUE+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 MAX16977RAUE+T?
For technical support, including MAX16977RAUE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977RAUE+T requirements.
6.How does Aetrix verify that MAX16977RAUE+T is sourced from the original manufacturer or authorized distributors?
All MAX16977RAUE+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 MAX16977RAUE+T meets industry standards.
7.What is the process for return or replacement of MAX16977RAUE+T?
All MAX16977RAUE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977RAUE+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 MAX16977RAUE+T part is unused and in its original packaging.
Return procedure for MAX16977RAUE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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