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Analog Devices Inc./Maxim Integrated MAX16977RAUE/V+T
- Part No.:
- MAX16977RAUE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977RAUE/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,393
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Product details
Overview
MAX16977RAUE/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 MAX16977RAUE/V+T datasheet, MAX16977RAUE/V+T pinout, MAX16977RAUE/V+T application, or MAX16977RAUE/V+T equivalent, this page delivers verified package mapping (16-pin TSSOP), confirmed thermal specs (−40°C to +125°C), validated protection features (42V transient tolerance, overvoltage/thermal shutdown), and real-world design constraints including 80ns minimum on-time and 98% max duty cycle during cold-crank.
Technical Context
The MAX16977RAUE/V+T implements a constant-frequency current-mode control architecture with internal transconductance error amplifier (gm = 900µS), fast load-transient response enabled by integrator-plus-load-line loop design, and dual-supply inputs (SUP/SUPSW) supporting independent 3.5V–36V operation. Its 80ns minimum on-time ensures stable 2.2MHz operation under high VIN–VOUT differentials.
It integrates a 5V BIAS LDO (4.7V–5.3V output, 3.1V UVLO), programmable oscillator (RFOSC-based, ±6% spread-spectrum option), and synchronous FSYNC input accepting external clocks >10% above internal fSW. Protection includes cycle-by-cycle current limit (ILX = 2.4A min), overvoltage trip at 110% VFB, and thermal shutdown at +175°C with 15°C hysteresis.
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 power delivery for microcontrollers, sensors, and CAN transceivers without external FETs. |
| Quiescent Current | 30µA at no load - meets OEM standby power budgets for always-on ECU modules. |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable) - allows optimization of inductor size, EMI, and efficiency across automotive temperature range. |
| Output Voltage Options | 5V fixed (via FB-to-BIAS tie) or 1V–10V adjustable (via external resistor divider) - simplifies design for multiple rail requirements. |
| Thermal Range | −40°C to +125°C ambient - qualified for under-hood placement in engine control and transmission modules. |
| High-Side RDS(on) | 70mΩ typical - reduces conduction loss and thermal stress in compact TSSOP package. |
Pinout & Package
MAX16977RAUE/V+T is packaged in a 16-pin TSSOP (exposed pad) with 0.65mm pitch, optimized for automotive thermal dissipation (θJA = 38.3°C/W, θJC = 3°C/W). The exposed pad must be soldered to a large-area ground plane for reliable 2A operation at +125°C ambient.
| 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 ±6% spread-spectrum option. |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% VFB; enables precise power-supply sequencing in multi-rail systems. |
| 4 (OUT) | Switch regulator output | Delivers regulated voltage; powers internal circuitry during standby when VOUT = 3V–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; interfaces with transconductance amplifier (gm = 900µS). |
| 7 (BIAS) | Internal 5V LDO output | Powers internal logic; requires 1µF ceramic bypass to GND; UVLO threshold = 3.1V with 400mV hysteresis. |
| 8 (GND) | Analog/digital ground reference | Primary signal return; EP must be connected to same ground plane but not used as sole GND path. |
| 9 (BST) | Bootstrap supply for high-side driver | Requires 0.1µF capacitor between BST and LX; enables gate drive for integrated 70mΩ MOSFET. |
| 10 (SUP) | Main supply input | Powers internal bias regulator; accepts 3.5V–36V; requires 1µF ceramic capacitor to GND. |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky freewheeling diode; handles 3A RMS current; voltage swing = 0V to VSUPSW. |
| 13–14 (SUPSW) | High-side switch supply | Separate 3.5V–36V input for internal FET; decoupled with 1µF + 4.7µF capacitors to minimize noise coupling. |
| 15 (EN) | Enable input | High-voltage compatible (3.3V–36V logic); 2V threshold with 0.2V hysteresis; pulls device into 5µA shutdown state when low. |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional for user routing or signal integrity. |
| EP | Exposed thermal pad | Electrically connected to GND; mandatory for thermal performance; requires ≥200mm² copper area and ≥4 thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RDS(on) eliminates need for external MOSFET, reducing BOM count and PCB footprint in space-constrained ECUs. |
| Automotive cold-crank support | 98% maximum duty cycle at 2.2MHz enables regulation down to 3.5V input during engine start, critical for ADAS camera modules. |
| Low-IQ skip mode | 30µA no-load current with automatic transition to VOUT-powered biasing extends battery life in always-on telematics units. |
| Robust protection suite | Includes overcurrent limit (2.4A min), overvoltage trip (110% VFB), thermal shutdown (+175°C), and 42V transient tolerance - meets ISO 7637-2 Pulse 5a. |
| Flexible clock architecture | Resistor-programmable fSW (1–2.2MHz), external synchronization (FSYNC), and optional factory-set spread spectrum reduce EMI in noise-sensitive radar systems. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powers 32-bit MCU, CAN transceiver, and analog front-end in gasoline/diesel engine management systems exposed to −40°C to +125°C ambient and 42V load-dump events. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 2A with tight line/load regulation (±0.5%) and fast transient recovery (<100µs) during injector firing. Use Value: Eliminates discrete high-side FET and gate driver, reducing solution size by 35% while maintaining AEC-Q100 Grade 0 compliance via validated thermal derating. |
Use Scenario: Generates clean 3.3V rail for CMOS image sensor and ISP in forward-facing collision avoidance cameras mounted behind windshield. IC Role / Device Role / Timing Role: Adjustable-output buck converter operating at 2.2MHz to minimize EMI near RF receivers; uses spread spectrum to pass CISPR 25 Class 5 radiated emissions. Use Value: 80ns minimum on-time ensures stable regulation during 9V–16V battery swings, preventing image sensor reset during cold-crank voltage sag. |
| Infotainment System Core Logic | Body Control Module (BCM) Subsystem |
Use Scenario: Supplies 1.2V/1.8V core and I/O rails for application processor and display controller in head-unit systems requiring low-noise, low-IQ operation. IC Role / Device Role / Timing Role: Secondary buck stage fed from main 5V rail; configured for 1.2V output with external feedback divider and soft-start timing matched to SoC power-up sequence. Use Value: 30µA standby current enables "instant-on" wake-from-sleep functionality without draining 12V battery during vehicle park mode. |
Use Scenario: Powers door module microcontroller, LIN transceiver, and LED drivers in distributed body electronics with wide input variation (9V–16V) and frequent sleep/wake cycles. IC Role / Device Role / Timing Role: Always-on 5V regulator with EN controlled by BCM wakeup signal; enters skip mode during 10ms–10s sleep intervals to maintain <50µA system IQ. Use Value: Integrated PGOOD monitor sequences power to peripheral ICs, eliminating need for external supervisor IC and reducing component count by two. |
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 | 4.5V–36V input, 3.5A output, 50µA IQ, fixed 2.1MHz fSW, no spread spectrum, 105°C max ambient | Higher current capability but higher quiescent current; lacks cold-crank duty-cycle extension and 125°C rating | Select when >2A load current is required and thermal margin permits lower ambient rating. |
| TPS62933RTER | 3V–36V input, 3A output, 15µA IQ, 1.8MHz–2.2MHz programmable fSW, no FSYNC, 105°C max ambient | Lower IQ but no synchronization input or 42V transient rating; limited to industrial temp grade | Select for cost-sensitive infotainment subsystems where AEC-Q100 qualification and load-dump immunity are not required. |
Compared with LM61480QRNXTQ1 and TPS62933RTER, the MAX16977RAUE/V+T uniquely combines −40°C to +125°C operation, 42V transient tolerance, 98% cold-crank duty cycle, and FSYNC synchronization - making it the only choice for safety-critical under-hood power rails requiring full AEC-Q100 Grade 0 compliance.
Availability
MAX16977RAUE/V+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature and high-reliability automotive production programs.
Supply support for MAX16977RAUE/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 interface solutions.
The MAX16977RAUE/V+T belongs to Analog Devices' automotive power management portfolio, engineered specifically for demanding under-hood DC-DC conversion where input transients, thermal extremes, and ultra-low standby power are non-negotiable design constraints.
FAQ
What is the maximum input voltage transient the MAX16977RAUE/V+T can withstand?
The MAX16977RAUE/V+T is rated for 42V input transients per ISO 7637-2 Pulse 5a, with absolute maximum ratings specifying SUP and SUPSW pins up to +42V for <1 second. This enables robust operation during automotive load-dump events without external TVS clamping in most designs. The device remains functional and protected throughout the transient, resuming normal regulation once voltage returns within 3.5V–36V range. MAX16977RAUE/V+T's internal overvoltage and thermal protections activate only if sustained beyond safe limits.
Does the MAX16977RAUE/V+T support synchronization to an external clock, and what are the requirements?
Yes, the MAX16977RAUE/V+T supports external clock synchronization via the FSYNC pin. The applied external clock 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 acquisition occurs within one clock cycle. When FSYNC is active, internal spread spectrum is disabled. MAX16977RAUE/V+T maintains full regulation accuracy and transient response during sync mode.
How does the MAX16977RAUE/V+T achieve 30µA quiescent current, and under what conditions?
The MAX16977RAUE/V+T achieves 30µA quiescent current in skip mode at no load with 5V output, enabled by internal circuitry powering down during idle cycles and drawing bias current from VOUT (when 3V ≤ VOUT ≤ 5.5V) instead of SUP. This occurs automatically when inductor current falls ≤300mA. Shutdown current drops further to 5µA when EN is pulled low. MAX16977RAUE/V+T maintains this ultra-low IQ across −40°C to +125°C ambient.
What is the purpose of the dual supply inputs SUP and SUPSW on the MAX16977RAUE/V+T?
SUP powers the internal bias regulator and logic circuitry, while SUPSW supplies the high-side MOSFET driver and switch. This separation allows optimal efficiency during cold-crank: when battery voltage sags to 3.5V, SUPSW may dip below VOUT, triggering high-duty-cycle operation (up to 98%) to sustain regulation. It also isolates switching noise from sensitive analog blocks. MAX16977RAUE/V+T requires separate 1µF + 4.7µF decoupling on SUPSW and 1µF on SUP for stable operation.
Can the MAX16977RAUE/V+T be used with a 3.3V output, and how is it configured?
Yes, the MAX16977RAUE/V+T supports 3.3V output via external resistor divider from OUT to FB to GND, using VFB = 1.0V as reference. For 3.3V, RFB1 (OUT–FB) and RFB2 (FB–GND) are calculated as RFB1 = RFB2 × (3.3V/1.0V − 1). The device maintains ±0.5% load regulation and fast transient response at 3.3V. MAX16977RAUE/V+T's 1V–10V adjustability and 80ns minimum on-time ensure stable 3.3V generation even at 2.2MHz switching frequency and 12V input.
MAX16977RAUE/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
MAX16977RAUE/V+T FAQ
1.How can I place an order for MAX16977RAUE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977RAUE/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 MAX16977RAUE/V+T reliable?
The price and inventory of MAX16977RAUE/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 MAX16977RAUE/V+T is usually 5 days.
3.What payment methods are accepted for MAX16977RAUE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977RAUE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977RAUE/V+T?
MAX16977RAUE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977RAUE/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 MAX16977RAUE/V+T?
For technical support, including MAX16977RAUE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977RAUE/V+T requirements.
6.How does Aetrix verify that MAX16977RAUE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16977RAUE/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 MAX16977RAUE/V+T meets industry standards.
7.What is the process for return or replacement of MAX16977RAUE/V+T?
All MAX16977RAUE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977RAUE/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 MAX16977RAUE/V+T part is unused and in its original packaging.
Return procedure for MAX16977RAUE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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