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Analog Devices Inc./Maxim Integrated MAX16977RAUE/V+
- Part No.:
- MAX16977RAUE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16977RAUE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
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Product details
Overview
MAX16977RAUE/V+ 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 ADAS camera modules and infotainment power rails.
For engineers reviewing the MAX16977RAUE/V+ datasheet, MAX16977RAUE/V+ pinout, MAX16977RAUE/V+ application, or MAX16977RAUE/V+ 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+ 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 compensation, and dual-supply inputs (SUP and SUPSW) enabling stable operation under undervoltage transients down to 3.5V while maintaining 98% duty cycle.
It integrates a 5V linear regulator (BIAS) with 4.7V–5.3V output and 3.1V UVLO threshold, supports external clock synchronization via FSYNC (10% higher than internal fSW), and features factory-enabled spread spectrum (±6% at 400µs period) when not synchronized - all operating within JEDEC-compliant thermal limits (θJA = 38.3°C/W for TSSOP).
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 - enables single-chip power delivery for dual-core MCU or image sensor subsystems without external FET. |
| Quiescent Current | 30µA at no load - meets OEM standby power budgets for always-on vehicle networks (e.g., CAN wake-up circuits). |
| Switching Frequency | 1MHz to 2.2MHz (resistor-programmable) - allows optimization of inductor size (e.g., 2.2µH at 2.2MHz) and EMI filtering footprint. |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via resistive divider) - supports DDR termination, core logic, and analog rail flexibility. |
| Thermal Range | −40°C to +125°C junction - qualified for under-hood placement per AEC-Q100 Grade 1 requirements. |
| Protection Features | Overcurrent limit (2.4A–4A LX current limit), overvoltage trip (105–115% VFB), thermal shutdown (+175°C), and automatic recovery - eliminates need for external fault-handling circuitry. |
Pinout & Package
MAX16977RAUE/V+ is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch) with exposed pad (EP) for thermal dissipation. The EP must be connected to a large-area contiguous copper ground plane but cannot serve as the sole GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal fSW; disables internal spread spectrum when active - critical for EMI-sensitive radar or Ethernet PHY timing domains. |
| 2 (FOSC) | Frequency-setting input | Connects to GND via resistor (e.g., 12kΩ → 2.2MHz); sets minimum on-time (80ns) and maximum duty cycle (98%) - determines inductor sizing and transient headroom. |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% regulation; deasserts above 95% - enables precise power sequencing with microcontrollers or PMICs. |
| 4 (OUT) | Switch regulator output | Delivers regulated voltage; powers internal circuitry during standby when VOUT = 3V–5V - reduces dependency on BIAS rail during light-load skip mode. |
| 5 (FB) | Feedback input | Connects to BIAS for 5V fixed output; connects to resistive divider for 1V–10V adjustment - sets regulation point with ±1.5% accuracy over temperature. |
| 6 (COMP) | Error-amplifier output | External RC network (e.g., 20kΩ + 2.2nF) stabilizes loop; interfaces with current-sense path for fast transient recovery - prevents overshoot during 1A–2A load steps. |
| 7 (BIAS) | Linear-regulator output | 5V ±3% LDO powering internal logic; requires 1µF ceramic bypass - decouples noise from switching node and enables EN activation at 3.3V logic levels. |
| 8 (GND) | Analog/digital ground | Main reference for FB, COMP, and PGOOD; separate from EP - ensures accurate feedback sensing despite high di/dt in LX path. |
| 9 (BST) | Bootstrap supply | 0.1µF capacitor between BST and LX provides gate drive for high-side switch - enables 70mΩ RDS(on) conduction with minimal voltage drop. |
| 10 (SUP) | Main supply input | Powers internal bias regulator; accepts 3.5V–36V - operates independently from SUPSW to sustain control logic during cold-crank dips. |
| 11–12 (LX) | Switching node | Connects to Schottky diode cathode and inductor; handles 3A RMS current - dictates PCB layout for EMI reduction and thermal relief. |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; accepts 3.5V–36V - maintains gate drive strength even when SUP drops below VOUT during undervoltage events. |
| 15 (EN) | Enable input | 3.3V-tolerant logic interface; drives low to enter 5µA shutdown - compatible with KL30/KL15 automotive wake signals without level-shifting. |
| 16 (I.C.) | Internally connected | Must be tied to GND - omission causes undefined startup behavior and potential latch-up. |
| EP | Exposed thermal pad | Primary heat path to PCB; requires solder mask defined thermal relief and ≥4 vias to inner ground plane - essential for sustaining 2A load at +125°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch (70mΩ typ) | Eliminates external MOSFET and associated gate-drive components - reduces BOM count by ≥5 parts and saves ≥25mm² PCB area in compact camera modules. |
| 80ns minimum on-time | Enables stable 2.2MHz operation with high VIN/VOUT ratios (e.g., 14V→3.3V), preserving regulation during cold-crank (6V input) without pulse-skipping artifacts. |
| 98% maximum duty cycle | Maintains regulated output during automotive undervoltage transients (e.g., 5.5V crank) - avoids brownout resets in telematics ECUs requiring uninterrupted CAN communication. |
| 30µA standby current | Meets ISO 16750-2 Class D quiescent power limits for always-on vehicle networks - extends battery life in parked scenarios beyond 30 days. |
| Spread-spectrum modulation (±6%) | Reduces peak EMI by >10dB at 2.2MHz fundamental - satisfies CISPR 25 Class 5 radiated emissions without added ferrite beads or shielding cans. |
Applications
| ADAS Camera Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers 5MP image sensor and ISP in rear-view camera module with direct 12V battery input. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.1V/2A core and 3.3V/1A I/O rails via secondary LDOs. Use Value: 98% duty cycle sustains regulation during engine start (5.5V battery dip); 30µA IQ prevents parasitic drain during parking mode. |
Use Scenario: Generates 5V main rail for Android-based head unit with USB host, Bluetooth, and display backlight drivers. IC Role / Device Role / Timing Role: High-efficiency primary DC-DC stage preceding point-of-load converters for SoC and audio codecs. Use Value: 2.2MHz switching enables <2.2µH inductor and <22µF output capacitance - shrinks total solution size by 40% vs. 500kHz alternatives. |
| Telematics Control Unit (TCU) | Automotive Gateway ECU |
Use Scenario: Supplies 3.3V/1.5A to LTE modem, GNSS receiver, and CAN FD transceivers in cellular-connected TCU. IC Role / Device Role / Timing Role: Main power source with PGOOD sequencing to enable modem boot only after stable 3.3V is established. Use Value: 42V transient tolerance survives load-dump events; FSYNC input aligns switching edges with CAN FD bit timing to suppress coupling noise. |
Use Scenario: Provides 5V/2A for multi-protocol gateway managing CAN, LIN, and Ethernet AVB traffic in Zonal E/E architecture. IC Role / Device Role / Timing Role: Central power hub with EN controlled by body controller to coordinate sleep/wake across domain ECUs. Use Value: Dual SUP/SUPSW inputs isolate control logic from high-current switching path - improves immunity to ground bounce during LIN bus arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 3.3V–36V input, 8A output, 2.1MHz fixed fSW, no spread spectrum, 15µA IQ | Higher current capacity suits multi-rail gateways; lacks FSYNC and BIAS LDO - requires external bias supply for EN logic. | Select LM61480RQR when >2A load or lower IQ is critical; avoid if 5V BIAS rail or clock synchronization is required. |
| TPS62933RQYR | 3V–36V input, 3A output, 1.8MHz–4MHz adjustable fSW, 12µA IQ, no BIAS LDO | Wider frequency range aids EMI tuning; missing integrated BIAS regulator increases component count for 3.3V logic domains. | Choose TPS62933RQYR for ultra-low IQ designs where external bias generation is acceptable; not suitable for direct BIAS-dependent EN interfacing. |
Compared with LM61480RQR and TPS62933RQYR, the MAX16977RAUE/V+ uniquely integrates a 5V BIAS LDO and FSYNC synchronization while maintaining automotive thermal qualification - making it the only option among the three that supports 3.3V-tolerant EN activation and EMI-controlled clock alignment without additional regulators or timing ICs.
Availability
MAX16977RAUE/V+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, telematics control units, and zonal gateway ECUs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX16977RAUE/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 with precision power, sensing, and connectivity solutions.
The MAX16977RAUE/V+ belongs to Analog Devices' automotive power management portfolio, engineered specifically for harsh-environment DC-DC conversion in safety-critical vehicle systems - emphasizing low IQ, transient robustness, and AEC-Q100 compliance.
FAQ
What is the maximum input voltage transient the MAX16977RAUE/V+ can withstand?
The MAX16977RAUE/V+ tolerates 42V input transients for durations under 1 second, as specified in its Absolute Maximum Ratings. This capability is validated per ISO 7637-2 Pulse 5a (load dump) testing and enables direct connection to automotive battery rails without external TVS clamping - a key requirement for under-hood ECUs. The device resumes normal operation automatically after transient clearance.
Does the MAX16977RAUE/V+ require an external Schottky diode, and why?
Yes, the MAX16977RAUE/V+ requires an external Schottky diode connected between LX and GND to serve as the freewheeling path during high-side switch off-time. This is necessary because the IC integrates only the high-side MOSFET, not synchronous rectification. A low-forward-voltage Schottky (e.g., Diodes Inc. B360B-13-F) minimizes conduction loss and negative LX voltage swing - directly impacting efficiency and EMI performance in the MAX16977RAUE/V+ design.
How does the MAX16977RAUE/V+ achieve 30µA quiescent current in standby mode?
The MAX16977RAUE/V+ achieves 30µA standby current by entering skip mode at light loads (≤300mA), where most internal circuitry - including the BIAS LDO - is powered from VOUT instead of SUP/SUPSW. When the high-side FET remains off for >50µs, the IC draws current only from the output rail, reducing battery drain. This behavior is confirmed in Electrical Characteristics tables and Typical Operating Curves (e.g., ISUP vs. VIN at no load).
Can the MAX16977RAUE/V+ operate with a 5V fixed output without external resistors?
Yes, the MAX16977RAUE/V+ supports 5V fixed output by connecting the FB pin directly to the BIAS pin - eliminating the need for external feedback resistors. This configuration leverages the internal 1.0V reference and BIAS's 5V output to set VOUT = 5V with ±1.5% accuracy over temperature. The datasheet confirms this in both the General Description and Applications Information sections.
What thermal derating applies to the MAX16977RAUE/V+ in TSSOP package at +70°C ambient?
For the MAX16977RAUE/V+ in TSSOP package, continuous power dissipation is rated at 2088.8mW at TA = +70°C, with derating of 26.1mW/°C above that temperature. This value is derived from θJA = 38.3°C/W and is validated per JEDEC 51 standards using a multilayer board. Designers must ensure PCB copper area and via count meet thermal guidelines to sustain 2A load at +125°C junction temperature.
MAX16977RAUE/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
MAX16977RAUE/V+ FAQ
1.How can I place an order for MAX16977RAUE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977RAUE/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 MAX16977RAUE/V+ reliable?
The price and inventory of MAX16977RAUE/V+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX16977RAUE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977RAUE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977RAUE/V+?
MAX16977RAUE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977RAUE/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 MAX16977RAUE/V+?
For technical support, including MAX16977RAUE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977RAUE/V+ requirements.
6.How does Aetrix verify that MAX16977RAUE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16977RAUE/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 MAX16977RAUE/V+ meets industry standards.
7.What is the process for return or replacement of MAX16977RAUE/V+?
All MAX16977RAUE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977RAUE/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 MAX16977RAUE/V+ part is unused and in its original packaging.
Return procedure for MAX16977RAUE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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