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Analog Devices Inc./Maxim Integrated MAX16977SATE+T
- Part No.:
- MAX16977SATE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977SATE+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
MAX16977SATE+T 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+T datasheet, MAX16977SATE+T pinout, MAX16977SATE+T application, or MAX16977SATE+T equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive thermal and transient performance, and real-world design implications for cold-crank operation, spread-spectrum EMI reduction, and power-good sequencing in safety-critical systems.
Technical Context
The MAX16977SATE+T implements a constant-frequency current-mode control architecture with 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) without external compensation. Its dual-supply inputs (SUP and SUPSW) decouple bias and switch drive paths, supporting independent voltage stress management under 42V load-dump transients.
It integrates a 5V linear regulator (BIAS) with 2.9V–3.3V UVLO hysteresis, a synchronization input (FSYNC) requiring ≥10% higher external clock frequency, and skip-mode operation triggered below 300mA load-reducing no-load IQ to 30µA while maintaining fast load-transient response via optimized loop gain and integrator architecture.
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 |
| Output Current | 2A continuous - sustains full load without external FET or heatsink in TQFN package |
| Quiescent Current | 30µA at no load - enables always-on subsystems meeting OEM standby power budgets |
| Switching Frequency | 1MHz to 2.2MHz - adjustable via FOSC resistor; higher frequencies reduce inductor size and output capacitance |
| Output Voltage Options | Fixed 5V (FB tied to BIAS) or 1V–10V adjustable - eliminates external feedback resistors for standard rail generation |
| Thermal Shutdown | +175°C with 15°C hysteresis - ensures safe recovery after overtemperature events in enclosed ECUs |
| Power-Good Accuracy | ±2.5% window (92.5%–95% VFB) - enables precise sequencing of downstream processors and sensors |
Pinout & Package
MAX16977SATE+T is packaged in a 16-pin TSSOP (exposed pad) and pin-compatible TQFN (5mm × 5mm). Both packages feature an exposed thermal pad (EP) that must be soldered to a large contiguous copper ground plane for effective heat dissipation and junction-to-ambient thermal resistance of 35°C/W (TQFN) or 38.3°C/W (TSSOP).
| 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 | Resistor-to-GND sets fSW from 1MHz to 2.2MHz; enables EMI optimization and layout flexibility |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% VFB; critical for MCU reset coordination and system boot sequencing |
| 4 (OUT) | Regulated output node | Delivers up to 2A; powers internal circuitry in standby when VOUT = 3V–5.5V |
| 5 (FB) | Feedback input | Connect to BIAS for fixed 5V; connect to resistive divider for 1V–10V adjustment with ±0.5% line/load regulation |
| 6 (COMP) | Error amplifier output | External RC network stabilizes control loop; supports ceramic output capacitors down to 22µF |
| 7 (BIAS) | Integrated 5V LDO output | Powers internal logic; requires 1µF bypass capacitor; UVLO threshold 3.1V (typ) with 400mV hysteresis |
| 8 (GND) | Analog/digital ground reference | Primary return path; EP must be connected to GND but not used as sole ground connection |
| 9 (BST) | Bootstrap supply for high-side driver | Requires 0.1µF capacitor between BST and LX; enables efficient gate drive of integrated 70mΩ FET |
| 10 (SUP) | Main supply input | Powers internal LDO; rated 3.5V–36V; requires 1µF bypass capacitor |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky freewheeling diode; handles 3A RMS current; peak voltage swing up to 47V |
| 13–14 (SUPSW) | High-side switch supply | Separate input for switch driver; improves efficiency under low-VIN conditions; requires 4.7µF + 1µF local decoupling |
| 15 (EN) | Enable input | High-voltage compatible (3.3V–36V); 2V threshold with 0.2V hysteresis; pulls device into 5µA shutdown state when low |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional for user interface or signal routing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ typical RDS(on) eliminates external MOSFET, reducing BOM count and PCB area in space-constrained automotive modules |
| Automotive temperature range | –40°C to +125°C ambient operation with +150°C junction limit - qualified per AEC-Q100 Grade 1 for under-hood deployment |
| Fast cold-crank support | 98% max duty cycle at 2.2MHz enables stable 5V output even during 3.5V battery dips - critical for infotainment and ADAS during engine start |
| Spread-spectrum option | ±6% triangular modulation at 400µs period (factory-set S-version) - reduces peak EMI by >10dB without altering layout or filter components |
| Robust protection suite | Overcurrent (2.4A–4A ILX limit), overvoltage (110% VFB trip), thermal shutdown (+175°C), and short-circuit immunity - enables unattended operation in harsh environments |
| Low-noise enable interface | EN pin accepts KL30, CAN transceiver INH, or battery directly - eliminates level-shifting circuitry and simplifies wake-up signaling |
Applications
| Engine Control Unit (ECU) Power Supply | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interfaces in gasoline/diesel engine control units exposed to wide battery voltage swings and thermal extremes. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and communication peripherals; provides PGOOD signal for MCU reset timing coordination. Use Value: Maintains regulation during 3.5V cold-crank and 42V load-dump events without external components, ensuring uninterrupted ECU operation per ISO 7637-2 Pulse 5a/b. |
Use Scenario: Generates clean 3.3V or 5V rail for CMOS image sensors, ISP processors, and gigabit Ethernet PHYs in forward-facing ADAS cameras mounted near windshield. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter with fast transient response; PGOOD enables synchronized sensor initialization and frame capture timing. Use Value: 80ns min-on-time and current-mode control deliver <50mV output deviation during 1A load steps, preventing image corruption or frame loss during vehicle acceleration. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Control Module |
Use Scenario: Supplies 5V to audio DSP, touchscreen controller, and Bluetooth/Wi-Fi SoCs in center-stack infotainment systems with always-on functionality. IC Role / Device Role / Timing Role: Standby-mode regulator with 30µA IQ; EN pin interfaces directly with ignition switch or CAN wake-up signal. Use Value: Enables sub-100µA system standby current compliance while retaining fast wake-up (<10ms soft-start) and seamless transition from sleep to full operation. |
Use Scenario: Provides isolated 5V rail for torque sensor signal conditioning, motor gate drivers, and ASIL-B microcontroller in EPS modules requiring functional safety. IC Role / Device Role / Timing Role: Safety-critical power stage with overvoltage/overcurrent/thermal fault reporting via PGOOD and internal diagnostics. Use Value: Fault detection within 10µs and automatic recovery from overloads prevent unintended steering assist loss, supporting ISO 26262 ASIL-B requirements. |
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 | 4A output, 3.3V–36V input, 2.1MHz fixed fSW, no spread spectrum, 25µA IQ | Higher current capability suits multi-rail systems; lacks FSYNC and adjustable fSW for EMI tuning | Select when >2A load or fixed-frequency simplicity outweighs programmability and EMI flexibility |
| TPS62933RTER | 3A output, 3V–36V input, 1.8MHz fixed fSW, 15µA IQ, no PGOOD, no spread spectrum | Lower IQ benefits ultra-low-power modules; missing PGOOD and thermal shutdown limits use in safety-critical domains | Select for non-safety automotive body electronics where sequencing and fault reporting are not required |
Compared with LM61480QPWPRQ1 and TPS62933RTER, the MAX16977SATE+T uniquely combines 2A capability with resistor-programmable frequency, spread-spectrum EMI reduction, automotive-grade PGOOD accuracy, and cold-crank robustness - making it optimal for compact, safety-aware ADAS and ECU point-of-load designs where layout space and transient immunity are constrained.
Availability
MAX16977SATE+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16977SATE+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 signal chain solutions.
The MAX16977SATE+T belongs to Analog Devices' automotive power management portfolio, designed specifically for demanding DC-DC conversion in engine compartments and ADAS subsystems where reliability under voltage transients, thermal stress, and EMI constraints is non-negotiable.
FAQ
What is the maximum input voltage transient the MAX16977SATE+T can withstand?
The MAX16977SATE+T 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 robust operation in automotive environments where alternator-induced spikes occur. The device remains functional without latch-up or damage, and resumes normal regulation once the transient subsides - a key requirement for ECU and ADAS power supplies.
Does the MAX16977SATE+T require external compensation components?
Yes, the MAX16977SATE+T requires external RC compensation on the COMP pin to ensure loop stability across all operating conditions. The recommended network uses CCOMP1 = 2.2nF and CCOMP2 = 12pF with RCOMP = 20kΩ for a 5V/2A design, as validated in the typical application circuit. Omitting or mis-sizing these components risks oscillation, poor transient response, or failure to regulate under light loads - especially with low-ESR ceramic output capacitors.
Can the MAX16977SATE+T operate with a 3.5V input and still deliver 5V output?
No - the MAX16977SATE+T cannot boost or invert; it is a buck-only converter. With a 3.5V input, the maximum achievable output is limited by duty cycle and dropout. However, its 98% max duty cycle at 2.2MHz allows it to maintain regulation down to ~3.6V input for a 5V output (D ≈ VOUT/VIN = 0.97), making it viable during cold-crank dips to 3.5V when paired with appropriate inductor selection and minimal PCB losses. Output voltage will drop if input falls below this threshold.
How does the MAX16977SATE+T handle thermal overload?
The MAX16977SATE+T incorporates a junction temperature sensor that triggers thermal shutdown at +175°C (typical), disabling both the internal bias regulator and step-down converter. After shutdown, the device automatically recovers once the junction cools by 15°C (hysteresis), resuming regulation without external intervention. This behavior is verified across –40°C to +125°C ambient and ensures safe operation in sealed enclosures like EPS modules or radar housings.
Is the MAX16977SATE+T pin-compatible with other devices in the MAX1697x family?
Yes - the MAX16977SATE+T shares identical pinout, package dimensions, and footprint with MAX16976 and MAX16978 in both TSSOP and TQFN variants. Functional differences exist (e.g., MAX16976 supports only 5V fixed output; MAX16978 adds I²C interface), but PCB layout, thermal pad, and passive component placement are fully interchangeable. This enables drop-in qualification upgrades and design reuse across multiple vehicle platforms.
MAX16977SATE+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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX16977SATE+T FAQ
1.How can I place an order for MAX16977SATE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SATE+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 MAX16977SATE+T reliable?
The price and inventory of MAX16977SATE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16977SATE+T is usually 5 days.
3.What payment methods are accepted for MAX16977SATE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SATE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SATE+T?
MAX16977SATE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SATE+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 MAX16977SATE+T?
For technical support, including MAX16977SATE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SATE+T requirements.
6.How does Aetrix verify that MAX16977SATE+T is sourced from the original manufacturer or authorized distributors?
All MAX16977SATE+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 MAX16977SATE+T meets industry standards.
7.What is the process for return or replacement of MAX16977SATE+T?
All MAX16977SATE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SATE+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 MAX16977SATE+T part is unused and in its original packaging.
Return procedure for MAX16977SATE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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