My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16977SATE/V+
- Part No.:
- MAX16977SATE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977SATE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,020
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX16977SATE/V+ 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 5V fixed or 1V–10V adjustable 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 unit (ECU) and ADAS power rail generation.
For engineers reviewing the MAX16977SATE/V+ datasheet, MAX16977SATE/V+ pinout, MAX16977SATE/V+ application, or MAX16977SATE/V+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive thermal and transient performance, and real-world design implications for undervoltage cold-crank resilience and spread-spectrum EMI reduction.
Technical Context
The MAX16977SATE/V+ implements constant-frequency current-mode control with 80ns minimum on-time and 98% maximum duty cycle-enabling stable regulation during automotive cold-crank events down to 3.5V input. 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 linear regulator (BIAS) with 3.1V UVLO hysteresis, a transconductance error amplifier (gm = 900µS), and a programmable soft-start (8.5ms). The FSYNC input supports external clock synchronization up to 10% above internal fSW, while skip mode activates below 300mA load to reduce standby current to 30µA.
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 during load dump. |
| Output Current | 2A continuous - enables single-chip 5V/2A rail for microcontrollers, sensors, and CAN transceivers without external FET. |
| Quiescent Current | 30µA at no load - meets OEM low-power requirements for always-on domains like body control modules. |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable) - allows optimization of inductor size, EMI, and efficiency; 2.2MHz enables <2.2µH inductors. |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via resistive divider) - simplifies BOM for multiple voltage rails in same platform. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking in under-hood environments. |
| PGOOD Accuracy | ±2.5% window (92.5%–95% VFB) - provides precise sequencing margin for downstream logic and analog ICs. |
Pinout & Package
MAX16977SATE/V+ is housed in a 16-pin TSSOP package with exposed pad (EP), optimized for automotive thermal dissipation and board-level reliability. θJA = 38.3°C/W (JEDEC 4-layer 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 oscillator frequency with ±15% tolerance. |
| 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 output; powers internal circuitry in standby when VOUT = 3–5V. |
| 5 (FB) | Feedback input | 1.0V reference point; tie to BIAS for 5V fixed output; connect resistive divider for adjustable output. |
| 6 (COMP) | Error amplifier output | Connect RC compensation network (e.g., 20kΩ + 2.2nF) to stabilize current-mode loop. |
| 7 (BIAS) | 5V linear regulator output | Supplies internal bias; requires 1µF ceramic bypass to GND; UVLO threshold = 3.1V (typ). |
| 8 (GND) | Power and signal ground | Primary return path; EP must be connected to large-area copper plane but not sole GND connection. |
| 9 (BST) | Bootstrap supply | Connect 0.1µF capacitor between BST and LX to drive high-side MOSFET gate. |
| 10 (SUP) | Bias regulator input | Powers internal LDO; accepts 3.5–36V; decouple with 1µF ceramic capacitor. |
| 11–12 (LX) | Switch node | Connects to inductor and Schottky diode cathode; handles 3A RMS; requires short, low-inductance routing. |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; decouple with 1µF + 4.7µF ceramics; withstands 42V transients. |
| 15 (EN) | Enable input | High-voltage compatible (3.3V–36V logic); 2V threshold; 0.9V low threshold with 0.2V hysteresis. |
| 16 (I.C.) | Internally connected | Must be connected to GND; not functional as signal pin. |
| EP | Exposed thermal pad | Connected to GND plane for thermal conduction; contributes to θJC = 3°C/W (TSSOP). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch (70mΩ typ) | Eliminates external MOSFET and gate driver, reducing solution size by >40% vs discrete buck designs. |
| 80ns minimum on-time | Enables stable 2.2MHz operation at high VIN/VOUT ratios (e.g., 14V→5V), critical for compact ECU layouts. |
| 98% max duty cycle | Maintains regulation during cold-crank (e.g., 4.5V input), preventing system brownout in start-stop applications. |
| Spread-spectrum option (factory-set S-version) | Reduces peak EMI by ±6% frequency modulation at 400µs period-no layout changes needed for CISPR 25 Class 5 compliance. |
| Fast load-transient response | Recovers from 0.5A→2A step within 100µs (AC-coupled VOUT), protecting sensitive ADCs and RF receivers from overshoot. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powers 32-bit MCU, CAN transceiver, and analog front-end in under-hood ECU exposed to -40°C to +125°C ambient and 42V load-dump transients. IC Role / Device Role / Timing Role: Primary 5V/2A buck regulator with PGOOD sequencing, cold-crank support, and thermal shutdown. Use Value: Eliminates need for external TVS and discrete high-side switch; 30µA IQ extends battery life in key-off monitoring mode. |
Use Scenario: Generates clean 3.3V rail for image sensor and ISP in forward-facing camera module with strict EMI limits. IC Role / Device Role / Timing Role: Adjustable-output buck converter synchronized to system clock via FSYNC to avoid beat frequencies. Use Value: 2.2MHz operation minimizes inductor size (<2.2µH); spread spectrum reduces radiated emissions without shielding. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
|
Use Scenario: Supplies isolated RS-485 transceivers and microcontroller in DIN-rail mounted PLC operating from 24V DC bus. IC Role / Device Role / Timing Role: High-input-voltage buck converter with overvoltage/overcurrent/thermal protection and 5V fixed output. Use Value: Withstands 42V surges per IEC 61000-4-5; 36V max input avoids need for pre-regulator stage in wide-input industrial systems. |
Use Scenario: Powers LTE modem, GNSS receiver, and secure element in vehicle telematics unit requiring always-on 3.3V/1.8V rails. IC Role / Device Role / Timing Role: Dual-rail generator (5V main, BIAS-derived 3.3V) with EN-controlled sequencing and PGOOD monitoring. Use Value: 5µA shutdown current enables >1-year battery backup life; EN compatibility with KL30/KL15 signals simplifies harness integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QWRNTRQ1 | 3.5V–36V input, 4A output, 2.1MHz fixed fSW, no FSYNC, 17µA IQ | Lacks frequency synchronization and spread spectrum; higher current rating increases cost/size for 2A use cases | Choose when higher output current headroom is required and EMI control via sync is not needed. |
| TPS62933QPWRRQ1 | 3V–36V input, 3A output, 1.8MHz–3.2MHz adjustable fSW, 15µA IQ, no BIAS LDO | No integrated 5V BIAS regulator; requires external bias supply for gate drivers and logic | Prefer when system already provides clean 5V bias rail and ultra-low IQ is prioritized over integrated simplicity. |
Compared with LM61480QWRNTRQ1 and TPS62933QPWRRQ1, MAX16977SATE/V+ uniquely combines integrated BIAS LDO, FSYNC capability, and factory-enabled spread spectrum-making it optimal for space-constrained, EMI-sensitive automotive modules where supply simplicity and transient resilience are critical.
Availability
MAX16977SATE/V+ is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera, industrial PLC, telematics control unit, and high-voltage DC-DC converter applications requiring stable component supply across extended temperature and transient conditions.
Supply support for MAX16977SATE/V+ 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.
MAX16977SATE/V+ belongs to Analog Devices' automotive power management portfolio, engineered specifically for harsh-environment DC-DC conversion in engine compartments and ADAS subsystems-emphasizing cold-crank resilience, low IQ, and EMI robustness.
FAQ
What is the maximum input voltage transient tolerance for MAX16977SATE/V+?
MAX16977SATE/V+ tolerates 42V input transients for durations under 1 second, as specified in the Absolute Maximum Ratings table. This meets ISO 7637-2 Pulse 5a (load dump) requirements for 12V automotive systems. The device sustains operation without latch-up or damage when VSUP or VSUPSW reaches 42V, provided the event duration remains ≤1s and thermal limits are observed.
Can MAX16977SATE/V+ operate with a 5V fixed output without external resistors?
Yes. MAX16977SATE/V+ supports 5V fixed output by connecting the FB pin directly to the BIAS pin-no external feedback resistors required. This configuration reduces component count, improves accuracy (VOUT = 4.925V–5.075V), and lowers no-load current to 30µA. The internal 1.0V reference and BIAS regulator ensure tight regulation across temperature and line variations.
Does MAX16977SATE/V+ support external clock synchronization?
Yes. MAX16977SATE/V+ features an FSYNC pin that accepts an external clock signal 10% higher than its internal switching frequency. When driven, the device synchronizes its PWM edges to the external clock, eliminating beat frequencies in multi-rail systems. Internal spread spectrum is automatically disabled during synchronization, preserving deterministic timing for EMI-sensitive applications.
What is the thermal shutdown behavior of MAX16977SATE/V+?
MAX16977SATE/V+ shuts down the internal bias regulator and step-down converter when junction temperature exceeds +175°C (typical), entering thermal shutdown. It automatically recovers once the junction cools by 15°C (hysteresis), resuming normal operation without requiring an EN toggle. This protects against sustained overload or inadequate heatsinking in under-hood deployments.
How does MAX16977SATE/V+ achieve fast load-transient response?
MAX16977SATE/V+ uses a current-mode architecture enhanced with an innovative loop design that combines high DC gain (for accuracy) and improved phase margin (for speed). Measured response shows recovery from 0.5A→2A load steps within 100µs (AC-coupled), limiting VOUT deviation to <±30mV-critical for powering noise-sensitive ADCs and RF receivers without additional post-regulation.
MAX16977SATE/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX16977SATE/V+ FAQ
1.How can I place an order for MAX16977SATE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SATE/V+ 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+ reliable?
The price and inventory of MAX16977SATE/V+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX16977SATE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SATE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SATE/V+?
MAX16977SATE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SATE/V+ 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+?
For technical support, including MAX16977SATE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SATE/V+ requirements.
6.How does Aetrix verify that MAX16977SATE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16977SATE/V+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX16977SATE/V+?
All MAX16977SATE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SATE/V+, 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+ part is unused and in its original packaging.
Return procedure for MAX16977SATE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16977SATE/V+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
