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Analog Devices Inc./Maxim Integrated MAX16977SAUE+T
- Part No.:
- MAX16977SAUE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977SAUE+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,712
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Product details
Overview
MAX16977SAUE+T from Analog Devices is a 2A, current-mode synchronous 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 quiescent current in standby, 2.2MHz switching (adjustable 1–2.2MHz), and operates across –40°C to +125°C for automotive power rails.
For engineers reviewing the MAX16977SAUE+T datasheet, MAX16977SAUE+T pinout, MAX16977SAUE+T application, or MAX16977SAUE+T equivalent, this page delivers verified electrical specs, thermal behavior under load-dump transients, skip-mode efficiency data, PGOOD timing thresholds, and validated TSSOP-16 package routing guidance - all critical for automotive ECU, ADAS camera module, and industrial 24V-to-5V point-of-load designs.
Technical Context
The MAX16977SAUE+T implements constant-frequency current-mode control with 80ns minimum on-time and 98% maximum duty cycle, enabling stable regulation during cold-crank undervoltage events down to 3.5V. Its dual-supply architecture separates SUP (bias regulator input) and SUPSW (high-side switch supply), allowing independent voltage handling and robustness against differential transients.
It integrates a 5V BIAS LDO (4.7–5.3V output), programmable oscillator with external resistor (RFOSC) and FSYNC synchronization input, plus fast-loop compensation via COMP pin. Protection includes overcurrent limit (2.4–4A), overvoltage trip at 110% 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 (12V/24V systems) and tolerates 42V load-dump transients. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, image sensors, CAN transceivers, and FPGA I/O rails without external FETs. |
| Quiescent Current | 30µA at no load - enables always-on subsystems (e.g., body control modules) to meet OEM low-power requirements. |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable) - allows optimization of inductor size, EMI filtering, and PCB area in space-constrained modules. |
| Output Voltage Options | Fixed 5V or adjustable 1V–10V via FB divider - eliminates external resistors for standard 5V rails while supporting custom logic or analog supply needs. |
| Thermal Performance | θJA = 38.3°C/W (TSSOP) - requires minimal copper area for thermal relief in automotive ambient up to +105°C board temperature. |
| Protection Features | Overcurrent, overvoltage (110% VFB), thermal shutdown (+175°C), and PGOOD monitoring - ensures safe operation during fault conditions without external supervision. |
Pinout & Package
MAX16977SAUE+T is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch) with exposed pad (EP) for thermal dissipation. Pin 1 is marked by a dot; EP must be soldered to a large contiguous ground plane but not used as sole GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal frequency; disables spread-spectrum when active - critical for EMI-sensitive infotainment systems. |
| 2 (FOSC) | Frequency-setting input | Connects to GND via RFOSC resistor (e.g., 12kΩ → 2.2MHz); sets switching frequency without trimming components. |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% VFB; deasserts above 95% VFB - enables precise power sequencing with µC reset controllers. |
| 4 (OUT) | Regulated output node | Delivers up to 2A; powers internal circuitry when VOUT = 3–5V in standby - reduces need for auxiliary bias supplies. |
| 5 (FB) | Feedback input | Shorted to BIAS for fixed 5V; connected to resistive divider for adjustable output - defines regulation setpoint with ±1% accuracy (0.99–1.01V reference). |
| 6 (COMP) | Error amplifier output | External RC network (e.g., 20kΩ + 2.2nF) stabilizes loop - required for transient response tuning in camera or radar modules. |
| 7 (BIAS) | Internal LDO output | 5V ±3% regulated supply for internal logic; bypassed with 1µF ceramic capacitor - decouples noise from sensitive analog blocks. |
| 8 (GND) | Analog/digital ground | Main return path; connects to EP and system GND - must be low-impedance to avoid ground bounce during LX switching. |
| 9 (BST) | Bootstrap supply | Connected to LX via 0.1µF capacitor - provides gate drive voltage for high-side MOSFET; critical for maintaining 70mΩ RDS(on). |
| 10 (SUP) | Bias regulator input | Supplies internal LDO; accepts 3.5–36V - isolates control logic from high-current switching path (SUPSW). |
| 11–12 (LX) | Switching node | Drives external Schottky diode (e.g., B360B); RMS current rating 3A - layout must minimize loop area to reduce EMI. |
| 13–14 (SUPSW) | High-side switch supply | Directly powers internal MOSFET; accepts 3.5–36V - enables high-duty-cycle operation during cold-crank (≥98%). |
| 15 (EN) | Enable input | Logic-compatible with 3.3V/5V/12V sources (VEN_HI = 2V); pulls device into 5µA shutdown - supports KL15/KL30 ignition control. |
| 16 (I.C.) | Internally connected | Must be tied to GND - unused internal node; floating connection risks instability or latch-up. |
| EP | Exposed thermal pad | Electrically GND; requires ≥200mm² copper pour - primary heat path; insufficient thermal relief causes junction temp exceedance above +125°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ typical RDS(on) eliminates external FET, reducing BOM count and PCB footprint by >30% vs. controller-based solutions. |
| Automotive-grade thermal range | –40°C to +125°C operation with +175°C thermal shutdown - qualified for engine bay, head unit, and ADAS sensor housings per AEC-Q100 stress profiles. |
| Fast load-transient response | Recovery within 100µs from 0→2A step (skip mode) - maintains <50mV droop for real-time vision processors and radar SoCs. |
| Spread-spectrum option (S-version) | ±6% triangular modulation at 2.2MHz base - reduces peak EMI by >10dB without altering filter component values. |
| Power-good accuracy | 92.5–97% VFB window with 10–60µs debounce - prevents false resets during brief line transients in vehicle start-stop cycles. |
Applications
| Automotive Body Control Module | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powers MCU, LIN transceiver, and LED drivers in door modules and seat controllers under 12V battery input with cold-crank dips to 3.5V. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing and EN-controlled wake-up from sleep mode. Use Value: 30µA standby current extends battery life during vehicle off-state; 98% duty cycle maintains regulation during cranking. |
Use Scenario: Supplies 5V/2A to CMOS image sensor and ISP in forward-facing camera, operating in engine compartment with ambient up to +105°C. IC Role / Device Role / Timing Role: Point-of-load converter with fast transient response and thermal shutdown for safety-critical vision processing. Use Value: 80ns min-on-time ensures stable 2.2MHz operation at 9V–16V input; BIAS LDO powers internal logic independently of output loading. |
| Industrial 24V-to-5V Conversion | Automotive Infotainment Display Rail |
Use Scenario: Converts unregulated 24V factory bus to clean 5V for PLC I/O modules and HMI controllers exposed to 42V surges. IC Role / Device Role / Timing Role: Robust step-down regulator with 42V transient tolerance and overvoltage protection. Use Value: Dual SUP/SUPSW inputs isolate control and power paths; 36V max rating exceeds EN 61000-4-5 Level 4 surge immunity requirements. |
Use Scenario: Generates 5V rail for LCD backlight driver and touch controller in center-stack display, co-located with high-speed USB and audio circuits. IC Role / Device Role / Timing Role: Low-noise DC-DC with FSYNC synchronization to system clock and spread-spectrum option. Use Value: Synchronized 2.2MHz switching avoids beat frequencies with display pixel clocks; PGOOD enables controlled panel power-up sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRTWRQ1 | 3.5–36V input, 4A output, 2.1MHz fixed frequency, 15µA IQ, no FSYNC input | Lacks synchronization capability and PGOOD accuracy (±3% vs. ±1% VFB); higher current rating unnecessary for 2A use cases | Choose LM61480QRTWRQ1 only if 4A headroom and AEC-Q100 Grade 0 (–40°C to +150°C) are required - otherwise MAX16977SAUE+T offers superior EMI control and sequencing precision. |
| TPS62933QPWRRQ1 | 3–36V input, 3A output, 1–2.2MHz adjustable, 12µA IQ, no integrated high-side FET driver | Requires external high-side MOSFET and gate driver; lacks BIAS LDO and integrated SUP/SUPSW separation | Choose TPS62933QPWRRQ1 only for designs needing ultra-low IQ (<15µA) and external FET flexibility - MAX16977SAUE+T delivers lower total solution cost and smaller footprint with full integration. |
Compared with LM61480QRTWRQ1 and TPS62933QPWRRQ1, the MAX16977SAUE+T uniquely combines FSYNC synchronization, ±1% VFB accuracy, dual-supply architecture for cold-crank resilience, and integrated BIAS LDO - making it optimal for automotive subsystems requiring precise power sequencing, EMI compliance, and compact 2A PoL conversion.
Availability
MAX16977SAUE+T is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera modules, and industrial 24V-to-5V point-of-load applications requiring stable component supply, AEC-Q100-compliant sourcing, and long-term lifecycle support.
Supply support for MAX16977SAUE+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 since 1965.
The MAX16977SAUE+T belongs to Analog Devices' automotive power management portfolio, designed specifically for harsh-environment DC-DC conversion in engine control, safety, and infotainment systems where input transients, thermal stress, and sequencing reliability are critical.
FAQ
What is the maximum input voltage the MAX16977SAUE+T can withstand during load-dump events?
The MAX16977SAUE+T supports 42V input transients for durations under 1 second, as specified in its Absolute Maximum Ratings. This capability meets ISO 7637-2 Pulse 5a requirements for 12V automotive systems and enables direct connection to battery rails without external TVS clamping in most ECU designs. The device remains functional and protects downstream circuitry during these events.
Does the MAX16977SAUE+T require an external Schottky diode, and what are the key selection criteria?
Yes, the MAX16977SAUE+T requires an external Schottky diode connected between LX and GND. Key selection criteria include reverse voltage rating >36V (to handle 42V transients), forward voltage <0.5V at 2A, and low leakage (<1µA at 36V). Diodes such as Diodes Inc. B360B-13-F are validated in Analog Devices' reference designs for optimal efficiency and thermal performance.
How does the MAX16977SAUE+T achieve 30µA quiescent current, and under what conditions is this value guaranteed?
The MAX16977SAUE+T achieves 30µA quiescent current in standby mode when operating with no load, VOUT = 5V, and TA = +25°C - as measured and specified in its Electrical Characteristics table. This low IQ is enabled by skip-mode operation, where internal circuitry draws power from VOUT (3–5.5V range) instead of SUP/SUPSW, minimizing battery drain in always-on automotive subsystems.
Can the MAX16977SAUE+T be synchronized to an external clock, and what are the constraints on that clock signal?
Yes, the MAX16977SAUE+T can be synchronized to an external clock applied to the FSYNC pin. The external clock frequency must be at least 10% higher than the internal oscillator frequency (e.g., >2.42MHz for a 2.2MHz internal setting) to ensure reliable acquisition. When synchronized, internal spread-spectrum modulation is disabled, but externally modulated clocks are accepted.
What is the purpose of the separate SUP and SUPSW pins on the MAX16977SAUE+T, and how should they be decoupled?
SUP powers the internal 5V BIAS LDO and control logic, while SUPSW directly supplies the high-side MOSFET driver. This separation enables robust operation during cold-crank events where SUPSW may dip below VOUT. SUP requires a 1µF ceramic capacitor to GND; SUPSW requires both 1µF and 4.7µF ceramics in parallel to GND to handle high di/dt switching currents and maintain gate drive stability.
MAX16977SAUE+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
MAX16977SAUE+T FAQ
1.How can I place an order for MAX16977SAUE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SAUE+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+T reliable?
The price and inventory of MAX16977SAUE+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+T is usually 5 days.
3.What payment methods are accepted for MAX16977SAUE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SAUE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SAUE+T?
MAX16977SAUE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SAUE+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+T?
For technical support, including MAX16977SAUE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SAUE+T requirements.
6.How does Aetrix verify that MAX16977SAUE+T is sourced from the original manufacturer or authorized distributors?
All MAX16977SAUE+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+T meets industry standards.
7.What is the process for return or replacement of MAX16977SAUE+T?
All MAX16977SAUE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SAUE+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+T part is unused and in its original packaging.
Return procedure for MAX16977SAUE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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