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Analog Devices Inc./Maxim Integrated MAX16977SATE/V+T
- Part No.:
- MAX16977SATE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977SATE/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,596
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Product details
Overview
MAX16977SATE/V+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, 2.2MHz switching frequency (resistor-programmable from 1MHz to 2.2MHz), and operates across –40°C to +125°C for engine control unit (ECU) power rails.
For engineers reviewing the MAX16977SATE/V+T datasheet, MAX16977SATE/V+T pinout, MAX16977SATE/V+T application, or MAX16977SATE/V+T equivalent, key selection criteria include its 42V transient tolerance, 98% max duty cycle during cold-crank, integrated PGOOD monitor, skip-mode efficiency at light load, and TQFN-16 (5mm × 5mm) thermally enhanced package with exposed pad.
Technical Context
The MAX16977SATE/V+T implements constant-frequency current-mode control with an internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and fast load-transient response enabled by integrator architecture enhancements. Its dual supply inputs-SUP (for bias LDO) and SUPSW (for high-side switch)-enable stable operation during undervoltage transients down to 3.5V while maintaining regulation via 98% duty cycle at 2.2MHz.
It supports external clock synchronization (FSYNC input), resistor-programmed oscillator (RFOSC), and optional factory-enabled spread spectrum (±6% modulation at 400µs period). Protection includes overcurrent limit (ILX = 2.4–4A), overvoltage trip (105–115% VFB), thermal shutdown at +175°C with 15°C hysteresis, and automatic 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 - delivers full rated current without external FET or heatsink in TQFN package at +70°C ambient. |
| Quiescent Current | 30µA at no load - enables always-on ECU subsystems meeting OEM standby power budgets. |
| Switching Frequency | 1MHz to 2.2MHz - adjustable via RFOSC resistor; higher frequencies reduce inductor size (e.g., 2.2µH @ 2.2MHz) and output capacitance. |
| Output Voltage Options | Fixed 5V (via FB-to-BIAS tie) or 1V–10V adjustable (via external resistive divider) - simplifies BOM for multiple rail requirements. |
| Thermal Performance | θJA = 35°C/W (TQFN) - enables 2A operation up to +70°C ambient without forced airflow or copper pour beyond EP connection. |
| Protection Features | Overcurrent, overvoltage (110% VFB trip), thermal shutdown (+175°C), and PGOOD monitoring - reduces need for external supervision circuitry. |
Pinout & Package
MAX16977SATE/V+T is housed in a 16-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad (EP) requiring connection to a solid ground plane for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal fSW for EMI-sensitive systems; disabled when tied to GND. |
| 2 (FOSC) | Oscillator frequency set | Resistor-to-GND (e.g., 12kΩ → 2.2MHz) enables board-level frequency tuning and noise shaping. |
| 3 (PGOOD) | Power-good monitor | Open-drain output asserts low when VOUT drops below 92.5% VFB; enables safe power sequencing in multi-rail systems. |
| 4 (OUT) | Regulated output node | Delivers 2A to load; also powers internal circuitry during standby when VOUT = 3–5V, reducing SUP current draw. |
| 5 (FB) | Feedback input | Connect to BIAS for fixed 5V; connect to resistive divider for adjustable output - sets regulation point at precise 1.00V (±1.5%). |
| 6 (COMP) | Error amplifier output | External RC compensation network (e.g., 20kΩ + 2.2nF) stabilizes current-mode loop and optimizes transient response. |
| 7 (BIAS) | Internal LDO output | 5V ±3% regulated supply for internal logic; requires 1µF ceramic bypass to GND for noise immunity and startup reliability. |
| 8 (GND) | Analog/digital ground | Primary reference for FB, COMP, and control circuitry; must be low-impedance and separated from power ground where possible. |
| 9 (BST) | Bootstrap supply | 0.1µF capacitor between BST and LX provides gate drive voltage for high-side MOSFET; critical for 100% duty cycle capability. |
| 10 (SUP) | Bias regulator input | Powers internal 5V LDO; accepts 3.5–36V; decoupled with 1µF ceramic capacitor to minimize noise coupling into BIAS. |
| 11–12 (LX) | Switch node | Connects to inductor and Schottky freewheeling diode; high dV/dt node requiring short, low-inductance PCB routing. |
| 13–14 (SUPSW) | High-side switch supply | Powers internal 70mΩ MOSFET; decoupled with 4.7µF + 1µF ceramics to sustain peak current during PWM transitions. |
| 15 (EN) | Enable input | High-voltage compatible (3.3V–36V logic); drives device into 5µA shutdown when pulled low; supports direct KL30 or CAN INH connection. |
| 16 (I.C.) | Internally connected | Must be tied to GND per datasheet; not functional but required for proper internal biasing and thermal performance. |
| EP | Exposed thermal pad | Primary thermal path to PCB; requires solder mask defined thermal relief and ≥4 vias to inner ground plane for θJC = 2.7°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RON (typ) eliminates external MOSFET, reduces BOM count by ≥4 components, and improves layout density in space-constrained ECUs. |
| Automotive temperature range | –40°C to +125°C operation with guaranteed parameters - qualified per AEC-Q100 Grade-1, enabling under-hood deployment without derating. |
| Fast cold-crank recovery | 98% max duty cycle at 2.2MHz allows sustained 5V output during 6V battery dips (e.g., engine start), preventing microcontroller brownouts. |
| Low-noise skip mode | Enters pulse-skipping below 300mA load, dropping IQ to 30µA while maintaining <±2% output regulation - ideal for always-on telematics modules. |
| Robust protection suite | Auto-recovering OCP, OVP (110% trip), thermal shutdown (+175°C), and PGOOD enable single-chip power solution without external supervisors. |
| EMI mitigation options | Adjustable fSW, external sync, and factory spread-spectrum (S-version) allow system-level EMI compliance without added filters or shielding. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in gasoline/diesel engine control units exposed to cold-crank (6V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing signal for MCU reset coordination and watchdog enable. Use Value: 98% duty cycle sustains 5V output during 6V cold-crank; 42V transient tolerance eliminates need for upstream TVS; 30µA IQ extends battery life in key-off state. |
Use Scenario: Generates clean 3.3V rail for image sensor and ISP in forward-facing ADAS cameras mounted behind windshield. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter with low EMI profile; synchronized to system clock via FSYNC to avoid beat frequencies with pixel clock. Use Value: 2.2MHz operation minimizes inductor size (2.2µH) for compact camera housing; spread-spectrum option (S-version) reduces radiated emissions in narrowband bands. |
| Infotainment System Core Logic | Body Control Module (BCM) Subsystem |
Use Scenario: Supplies 5V to audio DSP, touchscreen controller, and USB PHY in head-unit designs requiring low standby power and fast wake-up. IC Role / Device Role / Timing Role: Always-on buck regulator with EN controlled by ignition signal; soft-start (8.5ms) prevents inrush into large output capacitance. Use Value: 5µA shutdown current meets OEM "zero-power" requirements; 80ns min on-time ensures regulation stability across 9–16V input variation during vehicle operation. |
Use Scenario: Powers door module MCU, LIN transceiver, and LED drivers in distributed body electronics with wide input voltage swings. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting both active (2A) and sleep (30µA) modes; PGOOD confirms rail readiness before LIN communication. Use Value: Adjustable output (1–10V) enables single design for 3.3V MCU and 5V/12V LED driver rails; dual SUP/SUPSW inputs isolate bias and switch supplies for improved noise rejection. |
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 rating, 3.3–36V input, 1.5–2.2MHz fSW, 15µA IQ, no integrated BIAS LDO | Higher current capacity suits infotainment SoCs; lacks dedicated 5V BIAS rail for internal logic powering | Select when >2A load or lower IQ is critical; requires external 5V bias supply for control circuitry. |
| TPS54240QDGQRQ1 | 2.5A, 3.5–42V input, 100kHz–2.5MHz fSW, 145µA IQ, no PGOOD or spread spectrum | Broader input range handles 42V transients natively; higher IQ limits suitability for always-on modules | Choose for cost-sensitive industrial applications where 145µA standby is acceptable and PGOOD is implemented externally. |
Compared with LM61480QPWPRQ1 and TPS54240QDGQRQ1, the MAX16977SATE/V+T uniquely integrates a 5V BIAS LDO, delivers 30µA IQ at 5V output, and provides factory spread-spectrum - making it optimal for compact, low-EMI, always-on automotive subsystems where board space and regulatory compliance are constrained.
Availability
MAX16977SATE/V+T is available at Aetrix Electronics and suitable for automotive ECU power supplies, ADAS camera modules, and body control module subsystems requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX16977SATE/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 MAX16977 belongs to Analog Devices' automotive power management portfolio, designed specifically for harsh-environment DC-DC conversion in engine bay and ADAS applications where input transients, temperature extremes, and ultra-low standby power are critical.
FAQ
What is the maximum input voltage transient the MAX16977SATE/V+T can withstand?
The MAX16977SATE/V+T is rated for 42V input transients lasting less than 1 second, as specified in its Absolute Maximum Ratings table. This capability enables direct connection to automotive battery rails without additional transient voltage suppression, provided the steady-state input remains within 3.5V–36V. The device maintains regulation during these events using its 98% maximum duty cycle feature, which is critical for cold-crank survival. This 42V rating applies to both SUP and SUPSW pins.
Does the MAX16977SATE/V+T require external compensation components?
Yes, the MAX16977SATE/V+T requires an external RC network connected between COMP and GND for loop stability. A typical configuration uses a 20kΩ resistor and 2.2nF capacitor, as shown in the datasheet's compensation network section. This network sets the dominant pole and zero to ensure phase margin >45° across line, load, and temperature variations. The transconductance amplifier (gm = 900µS) and current-mode architecture simplify compensation versus voltage-mode controllers, but omission of these components will cause instability and output oscillation.
Can the MAX16977SATE/V+T operate with a 3.3V output voltage?
Yes, the MAX16977SATE/V+T supports 3.3V output via an external resistive feedback divider connected between OUT and FB, with FB referenced to GND. Using the standard equation RFB1 = RFB2 × (VOUT/VFB − 1) and VFB = 1.00V, a 10kΩ RFB2 yields RFB1 = 33kΩ for 3.3V. The device regulates accurately across –40°C to +125°C with ±0.5% load regulation and ±0.02%/V line regulation, making it suitable for powering 3.3V microcontrollers and interfaces in automotive environments.
How does the MAX16977SATE/V+T achieve 30µA quiescent current?
The MAX16977SATE/V+T achieves 30µA quiescent current by entering skip mode at light loads (≤300mA), where it disables most internal circuitry-including the bias LDO-and draws power directly from VOUT (when 3V ≤ VOUT ≤ 5.5V) instead of SUP. This architecture reduces current draw from the battery source to just 30µA while maintaining regulation. The 5V fixed-output configuration (FB tied to BIAS) further minimizes external component count and leakage paths that could increase standby current.
Is the MAX16977SATE/V+T pin-compatible with other devices in the MAX1697x family?
No, the MAX16977SATE/V+T is not pin-compatible with other MAX1697x variants such as MAX16976 or MAX16978. While all share the same TQFN-16 package outline and core functionality, pin assignments differ significantly-for example, the I.C. pin (pin 16) is grounded in MAX16977 but functions as a different control signal in other variants. Substituting without verifying pin mapping risks incorrect biasing, missing PGOOD assertion, or failure to enable. Always consult the specific variant's pin configuration diagram before replacement.
MAX16977SATE/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)
MAX16977SATE/V+T FAQ
1.How can I place an order for MAX16977SATE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SATE/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 MAX16977SATE/V+T reliable?
The price and inventory of MAX16977SATE/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 MAX16977SATE/V+T is usually 5 days.
3.What payment methods are accepted for MAX16977SATE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SATE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SATE/V+T?
MAX16977SATE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SATE/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 MAX16977SATE/V+T?
For technical support, including MAX16977SATE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SATE/V+T requirements.
6.How does Aetrix verify that MAX16977SATE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16977SATE/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 MAX16977SATE/V+T meets industry standards.
7.What is the process for return or replacement of MAX16977SATE/V+T?
All MAX16977SATE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SATE/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 MAX16977SATE/V+T part is unused and in its original packaging.
Return procedure for MAX16977SATE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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