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Analog Devices Inc./Maxim Integrated MAX16977RAUE+
- Part No.:
- MAX16977RAUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977RAUE+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,908
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Product details
Overview
MAX16977RAUE+ from Maxim Integrated 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 fixed 5V or adjustable 1V–10V output. It features 30µA standby quiescent current, 2.2MHz switching frequency (adjustable via external resistor), and operates across –40°C to +125°C for engine control unit (ECU) power rails.
For engineers reviewing the MAX16977RAUE+ datasheet, MAX16977RAUE+ pinout, MAX16977RAUE+ application, or MAX16977RAUE+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive thermal and transient performance, and real-world design implications for cold-crank resilience, spread-spectrum EMI reduction, and power-good sequencing in safety-critical systems.
Technical Context
The MAX16977RAUE+ 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 cold-crank (down to 3.5V input). Its dual supply inputs (SUP and SUPSW) decouple bias and switch-driver power paths, supporting independent voltage stress management under 42V load-dump transients.
It integrates a 5V linear regulator (BIAS) with 3.1V UVLO hysteresis, a synchronization input (FSYNC) accepting clocks >10% above internal fSW, and skip-mode operation below 300mA load-reducing no-load IQ to 30µA while maintaining fast load-transient recovery via optimized loop architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports direct connection to automotive battery (KL30/KL15) with 42V transient tolerance for ISO 7637-2 compliance. |
| Output Current | 2A continuous - sustains full load without external FET; LX RMS current rating is 3A for margin in pulsed conditions. |
| Switching Frequency | 1MHz to 2.2MHz - resistor-programmable (RFOSC) to optimize size/efficiency/EMI; synchronizable to external clock. |
| Quiescent Current | 30µA at no load - enables always-on subsystems (e.g., CAN wake-up logic) without draining battery during vehicle sleep. |
| Output Voltage Options | Fixed 5V (FB tied to BIAS) or 1V–10V adjustable - eliminates feedback resistors for standard rail generation; FB regulation voltage = 1.00V ±1.5% over temperature. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures safe operation in sealed ECU enclosures; junction-to-ambient θJA = 35°C/W (TQFN). |
| Power-Good Accuracy | ±2.5% window (92.5%–95% VFB) - provides precise sequencing signal for downstream processors and memory. |
Pinout & Package
MAX16977RAUE+ is supplied in a 16-pin TQFN package (5mm × 5mm, exposed pad), optimized for thermal dissipation in high-density automotive PCBs. The exposed pad (EP) must be soldered to a large contiguous copper ground plane but cannot serve as the sole GND connection.
| 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 timing with ±5% accuracy. |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% of regulation; debounced 10–60µs for noise immunity. |
| 4 (OUT) | Switch-regulator output | Delivers regulated DC output; powers internal circuitry in standby when VOUT = 3–5V. |
| 5 (FB) | Feedback input | 1.00V reference node; tie to BIAS for fixed 5V; connect resistive divider for adjustable output. |
| 6 (COMP) | Error-amplifier output | Connect RC compensation network here; gm = 900µS defines loop gain and phase margin. |
| 7 (BIAS) | 5V LDO output | Powers internal logic; requires 1µF ceramic bypass to GND; UVLO threshold = 3.1V. |
| 8 (GND) | Analog/digital ground | Primary return path; EP must be connected separately to same ground plane. |
| 9 (BST) | Bootstrap supply | Connect 0.1µF capacitor between BST and LX to drive high-side gate; max BST–LX = 6V. |
| 10 (SUP) | Main supply input | Powers internal LDO; rated –0.3V to +42V; requires 1µF ceramic decoupling. |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky diode cathode; handles peak currents up to 4A. |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; rated –0.3V to +42V; requires 1µF + 4.7µF decoupling. |
| 15 (EN) | Enable input | Logic-compatible with 3.3V/5V/12V sources; 2V high-threshold ensures robustness against battery sag. |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional; serves internal test structure. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RDS(on) (typ) reduces conduction loss and eliminates external MOSFET layout complexity in space-constrained ECUs. |
| Automotive-grade thermal range | –40°C to +125°C operation with 175°C thermal shutdown ensures reliability in under-hood environments. |
| Fast cold-crank response | 98% max duty cycle maintains 5V output during 3.5V battery sags, preventing microcontroller brownouts. |
| Low-noise spread spectrum | ±6% frequency modulation (factory-enabled in S-version) lowers peak EMI by >10dB without altering component selection. |
| Robust protection suite | Overvoltage (110% trip), overcurrent (2.4–4A limit), short-circuit (continuous), and thermal shutdown with auto-recovery. |
| Power-good sequencing support | PGOOD output meets ASAM MCD-2 MC requirements for deterministic power-rail coordination in ADAS modules. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in gasoline/diesel ECU under varying battery conditions (cold crank, load dump). IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD signaling for MCU reset coordination and watchdog enable timing. Use Value: Maintains regulation down to 3.5V input and survives 42V transients-eliminating need for upstream TVS or pre-regulator stages. |
Use Scenario: Generates isolated 3.3V/5V rails for digital I/O conditioning and fieldbus communication in factory automation controllers. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter with EN-controlled soft-start for hot-swap capability during module replacement. Use Value: 30µA standby current extends backup battery life in redundant power architectures; 2.2MHz switching minimizes filter footprint. |
| ADAS Camera Power Supply | Rail-to-Rail Industrial Sensor Interface |
Use Scenario: Supplies image sensor and ISP in automotive surround-view camera exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with skip mode for low-power parking mode and full-load video streaming. Use Value: 80ns min-on-time enables stable 5V output from 9V–16V input-critical for compact camera PCBs with tight thermal budgets. |
Use Scenario: Powers precision analog front-end (AFE) and ADC in industrial pressure/temperature transmitters. IC Role / Device Role / Timing Role: Low-noise, adjustable-output regulator feeding AFE reference and bias circuits. Use Value: 1.00V FB reference with ±0.5% line/load regulation ensures <0.1% measurement drift across 3.5–36V input range. |
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 | 4.5V–36V input, 3.5A, 2.1MHz, 15µA IQ, no integrated BIAS LDO | Lacks dedicated 5V BIAS rail; requires external bias supply for gate drivers | Preferred for higher-current designs where external bias is already present and lower IQ is critical |
| TPS62933RQYR | 3V–36V input, 3A, 1.8–2.2MHz, 12µA IQ, no spread spectrum, no FSYNC | No synchronization input or factory spread-spectrum option; tighter VFB tolerance (±0.5%) | Better for noise-sensitive RF subsystems needing ultra-low IQ but no clock sync requirement |
Compared with LM61480RQR and TPS62933RQYR, the MAX16977RAUE+ uniquely integrates a 5V BIAS LDO, supports FSYNC synchronization, and includes factory-enabled spread spectrum-making it the only choice among the three for automotive ECUs requiring coordinated multi-rail sequencing and EMI-compliant camera power.
Availability
MAX16977RAUE+ is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera, industrial PLC, and rail-to-rail sensor interface applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX16977RAUE+ 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets.
The MAX16977RAUE+ belongs to Maxim's automotive power-management portfolio, designed specifically for harsh-environment DC-DC conversion in engine control, infotainment, and ADAS systems with stringent AEC-Q100 Grade-1 qualification requirements.
FAQ
What is the maximum input voltage transient the MAX16977RAUE+ can withstand?
The MAX16977RAUE+ supports 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 automotive battery rails without external TVS clamping in most ECU designs. The device resumes normal operation after transient clearance without latch-up or parameter shift.
Does the MAX16977RAUE+ require an external Schottky diode?
Yes, the MAX16977RAUE+ requires an external Schottky diode connected between LX and GND to provide freewheeling current path during high-side switch off-time. Diode selection must consider reverse voltage rating >42V and low forward voltage (e.g., Diodes Inc. B360B-13-F) to minimize negative LX swing and conduction loss. No internal synchronous rectifier is present.
How does the MAX16977RAUE+ achieve 30µA quiescent current in standby mode?
The MAX16977RAUE+ achieves 30µA standby current by entering skip mode below 300mA load, disabling most internal circuitry-including the BIAS LDO-and powering control logic from VOUT (when 3V–5.5V). This architecture eliminates static bias current in the gate driver and oscillator, reducing total supply current to 30µA typical at no load and 25°C, as verified in the Electrical Characteristics table.
Can the MAX16977RAUE+ operate with a 3.5V input during cold-crank conditions?
Yes, the MAX16977RAUE+ maintains regulation at 3.5V input by extending duty cycle to 98%, enabled by its dual-supply architecture (SUP and SUPSW). During cold crank, SUPSW may drop below VOUT, triggering high-duty-cycle mode to sustain 5V output without dropout-verified in Typical Operating Characteristics Figure MAX16977 toc11 (Undervoltage Pulse test).
What is the function of the I.C. pin on the MAX16977RAUE+?
The I.C. pin (Pin 16) on the MAX16977RAUE+ is internally connected and must be tied to GND for proper operation. It serves no user-accessible function and is reserved for internal test structures during wafer sort and final test. Leaving it floating or connecting it to any other voltage violates Absolute Maximum Ratings and may cause undefined behavior or damage.
MAX16977RAUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
MAX16977RAUE+ FAQ
1.How can I place an order for MAX16977RAUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977RAUE+ 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+ reliable?
The price and inventory of MAX16977RAUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16977RAUE+ is usually 5 days.
3.What payment methods are accepted for MAX16977RAUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977RAUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977RAUE+?
MAX16977RAUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977RAUE+ 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+?
For technical support, including MAX16977RAUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977RAUE+ requirements.
6.How does Aetrix verify that MAX16977RAUE+ is sourced from the original manufacturer or authorized distributors?
All MAX16977RAUE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX16977RAUE+?
All MAX16977RAUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977RAUE+, 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+ part is unused and in its original packaging.
Return procedure for MAX16977RAUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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