My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16977SAUE/V+
- Part No.:
- MAX16977SAUE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977SAUE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,373
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX16977SAUE/V+ from Analog Devices is a 2A, current-mode, automotive-grade 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 no-load quiescent current, 1MHz–2.2MHz resistor-programmable switching frequency, and operates across –40°C to +125°C for engine control unit (ECU) power rails.
For engineers reviewing the MAX16977SAUE/V+ datasheet, MAX16977SAUE/V+ pinout, MAX16977SAUE/V+ application, or MAX16977SAUE/V+ 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 TSSOP-16 package compatibility with automotive PCB layouts.
Technical Context
The MAX16977SAUE/V+ 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 and SUPSW) decouple bias regulation from switch drive, supporting stable operation during undervoltage transients down to 3.5V.
It integrates a 5V linear regulator (BIAS) with 4.7V–5.3V output and 3.1V UVLO hysteresis, a synchronization input (FSYNC) accepting external clocks ≥10% above internal fSW, and spread-spectrum modulation (±6% at 400µs period) for EMI reduction - all factory-configured in the /V+ variant.
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 TSSOP-16 package at +70°C ambient. |
| Quiescent Current | 30µA at no load - enables always-on subsystems (e.g., CAN wake-up circuitry) with minimal battery drain. |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable) - allows optimization of inductor size, core loss, and EMI filtering footprint. |
| Output Voltage Options | Fixed 5V (FB tied to BIAS) or 1V–10V adjustable (via resistive divider) - supports multiple sub-rail requirements from single IC. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - prevents permanent damage during sustained overload or poor airflow conditions. |
| Power-Good Accuracy | 92.5%–97% VFB window - ensures precise sequencing with downstream logic and microcontrollers. |
Pinout & Package
MAX16977SAUE/V+ is housed in a 16-pin TSSOP package (4.4mm × 5.0mm, 0.65mm pitch) with exposed pad for thermal dissipation. Pin mapping is identical between TSSOP and TQFN variants per datasheet Figure 1; this part number corresponds specifically to the TSSOP-16 configuration.
| 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 timing without external crystal. |
| 3 (PGOOD) | Open-drain power-good output | Asserts low when VOUT drops below 92.5% VFB; used for supply sequencing and fault reporting. |
| 4 (OUT) | Regulated output node | Delivers up to 2A; powers internal circuitry when VOUT = 3V–5V during standby mode. |
| 5 (FB) | Feedback input | Tied to BIAS for fixed 5V; connected to resistive divider for adjustable output (VFB = 1.0V ±1.5%). |
| 6 (COMP) | Error amplifier output | Connects to RC compensation network (e.g., 20kΩ + 2.2nF) to stabilize current-mode loop. |
| 7 (BIAS) | Integrated LDO output | Supplies 5V @ 100mA to internal logic; requires 1µF ceramic bypass to GND for noise immunity. |
| 8 (GND) | Analog/digital ground reference | Primary return path; must be connected to large copper plane, separate from LX/SUPSW ground loops. |
| 9 (BST) | Bootstrap supply for high-side gate driver | Requires 0.1µF capacitor between BST and LX to sustain gate voltage during high-duty-cycle operation. |
| 10 (SUP) | Main supply input for bias regulator | Accepts 3.5V–36V; powers internal LDO and logic; bypassed with 1µF ceramic capacitor. |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky freewheeling diode; handles peak currents up to 3A RMS. |
| 13–14 (SUPSW) | High-side switch supply input | Separate 3.5V–36V input for internal FET driver; bypassed with 1µF + 4.7µF capacitors for low-impedance drive. |
| 15 (EN) | Enable input | Logic-compatible with 3.3V/5V/12V systems; 2V threshold enables direct connection to KL30 or CAN transceiver INH. |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional but required for mechanical and thermal integrity. |
| EP | Exposed thermal pad | Connected to GND plane for θJA = 38.3°C/W; mandatory for thermal reliability at full 2A load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch (70mΩ typ) | Eliminates external MOSFET and gate driver, reducing BOM count and layout area by >30% vs discrete solutions. |
| 98% maximum duty cycle | Maintains regulated 5V output during automotive cold-crank events (e.g., 4.5V battery sag) without dropout. |
| 8.5ms fixed soft-start | Prevents inrush current into up to 500µF output capacitance, avoiding fuse tripping and input rail collapse. |
| Overvoltage protection (105–115% VFB) | Shuts down switching if output exceeds safe margin, protecting downstream 5V logic and interface ICs. |
| Fast load-transient recovery (<100µs) | Recovers from 0.1A→2A step within 50mV deviation using enhanced current-mode loop architecture. |
| 5µA shutdown current | Enables ultra-low-power sleep states in telematics and ADAS modules where battery life is critical. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in under-hood ECU exposed to 125°C ambient and 42V load-dump transients. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and communication peripherals with PGOOD sequencing. Use Value: 30µA quiescent current extends battery life during vehicle-off state; 98% duty cycle sustains operation during cold-crank. |
Use Scenario: Generates isolated 3.3V/5V rails for digital I/O and analog signal conditioning in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter converting 24V industrial bus to clean 5V for FPGA and ADC reference supplies. Use Value: 36V max input accommodates 24V ±20% supply variation; spread-spectrum option reduces conducted EMI in noise-sensitive measurement circuits. |
| Automotive Infotainment Head Unit | High-Voltage IoT Gateway |
Use Scenario: Supplies 5V to display controller and audio codec in head unit requiring low-noise, always-on power with fast wake-up. IC Role / Device Role / Timing Role: Standby-mode buck regulator enabling instant-on functionality via EN-controlled entry/exit from 5µA shutdown. Use Value: Skip-mode operation achieves >85% efficiency at 10mA load; PGOOD signal triggers system boot sequence upon stable 5V rail. |
Use Scenario: Converts unregulated 12–48V PoE++ or solar input to 3.3V for wireless SoC and sensor fusion in outdoor smart infrastructure node. IC Role / Device Role / Timing Role: Wide-input buck converter providing robust, thermally efficient 3.3V rail in compact enclosure with limited airflow. Use Value: TSSOP-16 package fits tight board space; 175°C thermal shutdown prevents field failure in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 3.5V–36V input, 4A output, 2.1MHz fixed fSW, no spread spectrum, 25µA IQ | Higher current rating suits multi-rail systems; lacks FSYNC and adjustable fSW for EMI tuning | Select when >2A load or tighter IQ is required; verify PCB layout supports larger thermal pad. |
| TPS62933RTER | 3V–36V input, 3A output, 1.8MHz fixed fSW, 15µA IQ, no PGOOD or BIAS LDO | No integrated BIAS regulator or PGOOD; requires external 5V bias source and sequencing logic | Choose for ultra-low IQ designs where external bias is already available and sequencing is handled elsewhere. |
Compared with LM61480QRNXTQ1 and TPS62933RTER, the MAX16977SAUE/V+ uniquely combines 5V BIAS LDO, PGOOD, FSYNC, and spread-spectrum in a 2A TSSOP package - making it optimal for cost-constrained, space-limited automotive modules needing full feature integration without external support components.
Availability
MAX16977SAUE/V+ is available at Aetrix Electronics and suitable for automotive ECU, industrial PLC, infotainment head units, and high-voltage IoT gateways requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for MAX16977SAUE/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 power management semiconductors, serving automotive, industrial, and communications markets with precision, reliability, and longevity.
The MAX16977SAUE/V+ belongs to Analog Devices' automotive power management product line, designed specifically for harsh-environment DC-DC conversion in engine control, ADAS, and body electronics where input transients, thermal stress, and low-quiescent operation are critical.
FAQ
What is the maximum input voltage transient the MAX16977SAUE/V+ can withstand?
The MAX16977SAUE/V+ is rated for 42V input transients lasting less than 1 second, complying with ISO 7637-2 Pulse 5a (load dump) requirements for automotive applications. This capability is achieved through robust internal overvoltage clamping and process design, allowing direct connection to vehicle battery without external TVS diodes in many implementations. The absolute maximum rating for SUP and SUPSW pins remains 42V, and operation beyond this risks permanent damage. Always verify system-level transient suppression per OEM specifications before final design sign-off.
Does the MAX16977SAUE/V+ require external compensation components?
Yes, the MAX16977SAUE/V+ requires external compensation components connected to the COMP pin - typically a series RC network (e.g., 20kΩ resistor and 2.2nF capacitor to GND) - to stabilize the current-mode control loop. The exact values depend on selected inductor, output capacitor ESR, and desired phase margin. Compensation is mandatory for stable operation across temperature and load; omitting it causes oscillation or poor transient response. Refer to the "Compensation Network" section of the MAX16977SAUE/V+ datasheet for design equations and recommended configurations.
Can the MAX16977SAUE/V+ operate with only the SUP pin powered?
No - the MAX16977SAUE/V+ requires both SUP and SUPSW pins to be powered for normal operation. SUP supplies the internal bias regulator (BIAS), while SUPSW powers the high-side switch driver. If only SUP is connected, the device may power up the logic but cannot drive the internal FET, resulting in no output regulation. Both inputs must be connected to the same source (e.g., 12V battery) or independently regulated rails within the 3.5V–36V range, each properly bypassed with ceramic capacitors as specified in the datasheet.
What is the purpose of the I.C. pin on the MAX16977SAUE/V+?
The I.C. pin (Pin 16) on the MAX16977SAUE/V+ is internally connected and must be tied to GND for proper mechanical mounting, thermal conduction, and electrical reference. It is not a functional signal pin - no current flows through it, and it serves no control or monitoring role. Leaving it floating violates the recommended layout and may compromise thermal performance or cause latch-up under stress conditions. Always connect I.C. directly to the main GND plane using a short, low-inductance trace.
How does skip mode improve light-load efficiency in the MAX16977SAUE/V+?
Skip mode in the MAX16977SAUE/V+ disables switching and most internal circuitry when inductor current falls below ~300mA, allowing the output capacitor to supply load current until VOUT drops to ~95% of regulation - then a single switching cycle restores voltage. This reduces average supply current to 30µA (vs. ~3.5mA in PWM mode), significantly extending battery life in always-on automotive subsystems. Skip mode activates automatically; no external control is needed. It is especially effective for loads <200mA where PWM inefficiency dominates.
MAX16977SAUE/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
MAX16977SAUE/V+ FAQ
1.How can I place an order for MAX16977SAUE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SAUE/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 MAX16977SAUE/V+ reliable?
The price and inventory of MAX16977SAUE/V+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX16977SAUE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SAUE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SAUE/V+?
MAX16977SAUE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SAUE/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 MAX16977SAUE/V+?
For technical support, including MAX16977SAUE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SAUE/V+ requirements.
6.How does Aetrix verify that MAX16977SAUE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16977SAUE/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 MAX16977SAUE/V+ meets industry standards.
7.What is the process for return or replacement of MAX16977SAUE/V+?
All MAX16977SAUE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SAUE/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 MAX16977SAUE/V+ part is unused and in its original packaging.
Return procedure for MAX16977SAUE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16977SAUE/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…
