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Analog Devices Inc./Maxim Integrated MAX16977SAUE/V+T
- Part No.:
- MAX16977SAUE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977SAUE/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,802
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Product details
Overview
MAX16977SAUE/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 5V fixed or 1V–10V adjustable output - designed for direct car-battery-to-sub-5V conversion in engine control units and ADAS power rails.
For engineers reviewing the MAX16977SAUE/V+T datasheet, MAX16977SAUE/V+T pinout, MAX16977SAUE/V+T application, or MAX16977SAUE/V+T equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive temperature operation (−40°C to +125°C), exact package mapping (16-pin TSSOP with exposed pad), and two rigorously cross-checked alternative parts for OEM power-supply design.
Technical Context
The MAX16977SAUE/V+T implements a constant-frequency current-mode PWM architecture with internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and 98% maximum duty cycle during cold-crank undervoltage events. It features dual supply inputs (SUP and SUPSW) enabling stable operation across 3.5V–36V input while tolerating 42V load-dump transients.
Its integrated BIAS LDO (5V ±3%, 4.7V–5.3V) powers internal circuitry and supports VOUT = 3V–5.5V standby mode operation; FSYNC synchronization accepts external clocks ≥10% above internal fSW, and skip-mode activation occurs at ≤300mA load with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (≥3.5V) and load-dump survival (42V transient) |
| 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 subsystems meeting OEM low-power requirements |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable via FOSC) - allows optimization of inductor size, EMI, and efficiency |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via external resistor divider) - eliminates need for feedback resistors in 5V systems |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress test conditions |
| Protection Features | Overcurrent limit (2.4A–4A ILX trip), overvoltage (105–115% VFB), thermal shutdown (+175°C), and short-circuit robustness - all with automatic recovery |
Pinout & Package
MAX16977SAUE/V+T is housed in a 16-pin TSSOP package (5.0mm × 6.4mm × 1.2mm) with exposed thermal pad (EP), optimized for automotive PCB layouts requiring high thermal dissipation and space-constrained mounting. θJA = 38.3°C/W (JEDEC 51 multilayer board).
| 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 from 1MHz to 2.2MHz |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT falls below 92.5% VFB; deasserts high above 95% VFB - enables precise power sequencing |
| 4 (OUT) | Regulated output node | Delivers up to 2A; supplies 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 = 1.0V ±1.5%) |
| 6 (COMP) | Error amplifier output | External RC compensation network required for loop stability; gm = 900µS ensures fast transient response |
| 7 (BIAS) | Internal LDO output | 5V ±3% regulated supply for internal logic; requires 1µF ceramic bypass to GND |
| 8 (GND) | Analog/digital ground reference | Primary return path; EP must be connected to large-area contiguous copper ground plane |
| 9 (BST) | Bootstrap supply for high-side driver | Requires 0.1µF capacitor between BST and LX to sustain gate drive during high-duty-cycle operation |
| 10 (SUP) | Main supply input | Powers internal bias regulator; rated −0.3V to +42V; requires 1µF ceramic decoupling |
| 11–12 (LX) | Switching node | Connects to Schottky freewheeling diode cathode; handles peak currents up to 3A RMS |
| 13–14 (SUPSW) | High-side switch supply input | Powers internal 70mΩ MOSFET; rated −0.3V to +42V; requires 1µF + 4.7µF decoupling |
| 15 (EN) | Enable input | High-voltage compatible (3.3V–36V logic); 2V threshold enables direct connection to KL30 or CAN transceiver INH |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional as signal pin |
| EP | Exposed thermal pad | Not a signal pin; mandatory connection to solid GND plane for thermal performance and reliability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ typical RON eliminates external FET, reduces BOM count, and minimizes footprint in space-constrained ECUs |
| Ultra-low quiescent current | 30µA standby current enables compliance with ISO 16750-2 sleep-mode leakage limits for always-on vehicle networks |
| Automotive-grade thermal protection | +175°C thermal shutdown with 15°C hysteresis ensures safe operation during sustained high-ambient under-hood conditions |
| Fast load-transient response | Current-mode control with integrator architecture achieves <100µs recovery from 0.5A→2A step load without overshoot exceeding 50mV |
| Robust input transient tolerance | Withstands 42V/1s load-dump events and maintains regulation down to 3.5V input - meets ISO 7637-2 Pulse 5a requirements |
Applications
| Engine Control Unit (ECU) Power Rail | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Supplies 5V/2A to microcontroller, CAN transceivers, and sensor interfaces in gasoline/diesel engine control modules operating under cold-crank (≤6V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V rail; manages power sequencing via PGOOD and supports EN-controlled wake-up from deep sleep. Use Value: Eliminates need for pre-regulator stages; 98% duty cycle sustains output during cranking; 30µA IQ extends battery life during key-off monitoring. |
Use Scenario: Powers vision processor SoCs and radar MMICs in front-camera and surround-view systems requiring clean, low-noise 3.3V or 5V rails. IC Role / Device Role / Timing Role: Point-of-load converter with adjustable output; uses spread-spectrum option (S-version) to reduce EMI near sensitive RF receivers. Use Value: 2.2MHz switching enables compact 2.2µH inductor and low-profile ceramic capacitors; FSYNC sync prevents beat frequencies with camera pixel clocks. |
| Infotainment System Core Supply | Body Control Module (BCM) Subsystem |
|
Use Scenario: Generates 5V for audio DSPs, display controllers, and USB PHYs in head-unit designs where EMI must meet CISPR 25 Class 5 limits. IC Role / Device Role / Timing Role: Main DC-DC stage with programmable fSW and optional spread-spectrum modulation to suppress narrowband emissions. Use Value: Adjustable frequency avoids interference with AM/FM bands; soft-start (8.5ms) prevents inrush-induced voltage droop on shared battery lines. |
Use Scenario: Provides regulated 5V to LIN transceivers, door-lock actuators, and interior lighting drivers in distributed body electronics architectures. IC Role / Device Role / Timing Role: High-reliability buck converter with overvoltage/overcurrent/thermal protection - critical for fail-safe subsystems. Use Value: Automatic recovery from fault conditions avoids system resets; 125°C junction rating supports placement near HVAC ducts or fuse boxes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QWRNXTQ1 | 3.3V–36V input, 4A output, 2.1MHz fixed fSW, 15µA IQ, no FSYNC, no spread-spectrum | Lacks synchronization and spread-spectrum; higher current rating suits future-proofing but increases cost and layout complexity | Select when higher output current headroom is needed and EMI control via external clock is unnecessary |
| TPS62933QPWRRQ1 | 3V–36V input, 3A output, 2.2MHz fixed fSW, 12µA IQ, FSYNC support, no adjustable fSW or BIAS LDO | No resistor-programmable frequency or integrated BIAS regulator - requires external bias supply for VOUT < 3V operation | Choose for lowest IQ and simplified layout where fixed 2.2MHz suffices and BIAS functionality is not required |
Compared with LM61480QWRNXTQ1 and TPS62933QPWRRQ1, the MAX16977SAUE/V+T uniquely combines resistor-programmable frequency, integrated BIAS LDO, and automotive-qualified spread-spectrum capability - making it optimal for noise-sensitive, thermally constrained, and cost-sensitive 2A automotive rails where design flexibility matters.
Availability
MAX16977SAUE/V+T is available at Aetrix Electronics and suitable for automotive ECU power rails, ADAS domain controllers, infotainment core supplies, and body electronics requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MAX16977SAUE/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 technologies, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and timing solutions.
The MAX16977SAUE/V+T belongs to Analog Devices' automotive power management portfolio, engineered specifically for harsh-environment DC-DC conversion in engine compartments and safety-critical electronic control units.
FAQ
What is the maximum input voltage transient the MAX16977SAUE/V+T can withstand?
The MAX16977SAUE/V+T is rated for 42V input transients lasting up to 1 second, complying with ISO 7637-2 Pulse 5a load-dump requirements. Its dual-supply architecture (SUP and SUPSW) maintains regulation during these events without latch-up or damage, provided external components (input capacitors, Schottky diode) meet recommended ratings. This capability is confirmed in the Absolute Maximum Ratings table and validated in the LOAD DUMP TEST waveform (toc12).
Does the MAX16977SAUE/V+T support both fixed 5V and adjustable output configurations?
Yes, the MAX16977SAUE/V+T supports both configurations: tie FB directly to BIAS for a precise 5V fixed output (±1.5% over temperature), or connect FB to an external resistive divider from OUT to GND to set outputs from 1V to 10V. The internal 1.0V feedback reference (VFB = 1.0V ±1.5%) enables accurate scaling, and the datasheet provides the exact resistor calculation formula in the Applications Information section.
How does the MAX16977SAUE/V+T achieve ultra-low 30µA quiescent current?
The MAX16977SAUE/V+T achieves 30µA no-load IQ through multi-stage power gating: in skip mode, most internal circuitry (including the BIAS LDO) draws power from VOUT instead of SUP/SUPSW when VOUT = 3V–5.5V, and the high-side FET stops switching for >50µs. This architecture is explicitly verified in the SUPPLY CURRENT vs. SUPPLY VOLTAGE plot (toc03) and Electrical Characteristics table (ISUP_STANDBY = 30µA typ at TA = +25°C).
What package type and thermal characteristics apply to the MAX16977SAUE/V+T?
The MAX16977SAUE/V+T is supplied in a 16-pin TSSOP package (suffix "SAUE") with exposed thermal pad (EP). Its junction-to-ambient thermal resistance is 38.3°C/W (JEDEC 51 multilayer board), and junction-to-case is 3°C/W. These values are measured per JEDEC JESD51-7 and published in the Package Thermal Characteristics table - confirming suitability for conduction-cooled automotive PCBs with adequate copper area under EP.
Can the MAX16977SAUE/V+T be synchronized to an external clock, and what are the requirements?
Yes, the MAX16977SAUE/V+T 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) and meet specified voltage thresholds (VFSYNC_HI = 1.4V, VFSYNC_LO = 0.4V). Synchronization disables internal spread-spectrum but preserves all other protections and regulation accuracy, as documented in the Electrical Characteristics and Detailed Description sections.
MAX16977SAUE/V+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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16977SAUE/V+T FAQ
1.How can I place an order for MAX16977SAUE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SAUE/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 MAX16977SAUE/V+T reliable?
The price and inventory of MAX16977SAUE/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 MAX16977SAUE/V+T is usually 5 days.
3.What payment methods are accepted for MAX16977SAUE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SAUE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SAUE/V+T?
MAX16977SAUE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SAUE/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 MAX16977SAUE/V+T?
For technical support, including MAX16977SAUE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SAUE/V+T requirements.
6.How does Aetrix verify that MAX16977SAUE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16977SAUE/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 MAX16977SAUE/V+T meets industry standards.
7.What is the process for return or replacement of MAX16977SAUE/V+T?
All MAX16977SAUE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SAUE/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 MAX16977SAUE/V+T part is unused and in its original packaging.
Return procedure for MAX16977SAUE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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