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Analog Devices Inc./Maxim Integrated MAX16977RATE/V+CMF
- Part No.:
- MAX16977RATE/V+CMF
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977RATE/V+CMF.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,570
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Product details
Overview
MAX16977RATE/V+CMF from Maxim Integrated is a 36V, 2A, current-mode synchronous step-down DC-DC converter with integrated 70mΩ high-side MOSFET, adjustable 1MHz–2.2MHz switching frequency, 30µA no-load quiescent current, and automotive-grade -40°C to +125°C operation - designed for direct car-battery-to-sub-5V conversion in ADAS camera modules and infotainment power rails.
For engineers reviewing the MAX16977RATE/V+CMF datasheet, MAX16977RATE/V+CMF pinout, MAX16977RATE/V+CMF application, or MAX16977RATE/V+CMF equivalent, key selection criteria include its 42V transient tolerance, 98% max duty cycle during cold-crank undervoltage, fixed/adjustable output (5V or 1V–10V), spread-spectrum EMI reduction option, and dual-supply inputs (SUP/SUPSW) enabling robust operation across wide automotive input ranges.
Technical Context
The MAX16977RATE/V+CMF implements constant-frequency current-mode control with internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and fast load-transient response enabled by integrator architecture enhancements. It supports resistor-programmed oscillator (RFOSC) and external clock synchronization via FSYNC input with ±10% acquisition window.
Its dual-input architecture separates bias supply (SUP) from switch supply (SUPSW), allowing stable regulation down to 3.5V input while maintaining 98% duty cycle during undervoltage transients. The BIAS LDO delivers 4.7–5.3V at up to 100mA and powers internal circuitry when VOUT is 3–5.5V in skip mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (≥3.5V) and load-dump (42V transient tolerant) |
| Output Current | 2A continuous - enables single-chip power for dual-core MCU or image sensor SoC without external FET |
| Switching Frequency | 1MHz to 2.2MHz - adjustable via RFOSC resistor; higher frequencies reduce inductor size (e.g., 2.2MHz → 2.2µH typical) |
| Quiescent Current | 30µA at no load - meets OEM standby power budgets for always-on ADAS modules |
| Output Voltage Options | Fixed 5V (FB tied to BIAS) or adjustable 1V–10V (via external resistor divider) - simplifies design for multiple rail requirements |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis - ensures reliability in sealed automotive enclosures |
| Power-Good Accuracy | ±2.5% VFB threshold (92.5%–97% trip points) - enables precise sequencing with downstream processors |
Pinout & Package
MAX16977RATE/V+CMF is packaged in a 16-pin TQFN (5mm × 5mm) with exposed pad, optimized for thermal dissipation in space-constrained automotive PCBs. Junction-to-ambient thermal resistance is 35°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | External clock sync input | Accepts 10% higher-frequency external clock; disables internal spread spectrum when active |
| 2 (FOSC) | Oscillator frequency setting | Connects to GND via resistor (e.g., 12kΩ → 2.2MHz); sets fSW across full 1–2.2MHz range |
| 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 voltage; powers internal circuitry in standby when VOUT = 3–5.5V |
| 5 (FB) | Feedback input | Connect to BIAS for fixed 5V; connect to resistive divider for 1V–10V adjustment (VFB = 1.0V ±1.5%) |
| 6 (COMP) | Error amplifier output | Interface for RC compensation network; determines loop stability and transient response |
| 7 (BIAS) | Internal LDO output | 5V ±3% linear regulator; powers internal logic; requires 1µF ceramic bypass to GND |
| 8 (GND) | Analog/digital ground | Primary reference node; EP must be connected to large copper pour for thermal performance |
| 9 (BST) | Bootstrap supply | Connect 0.1µF capacitor between BST and LX to drive high-side MOSFET gate |
| 10 (SUP) | Bias supply input | Powers internal LDO; accepts 3.5–36V; decouple with 1µF ceramic capacitor |
| 11–12 (LX) | Switch node | Connects to inductor and Schottky freewheel diode cathode; handles 3A RMS current |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; decouple with 1µF + 4.7µF capacitors to GND |
| 15 (EN) | Enable input | Logic-compatible enable (VEN_HI = 2V min); connects directly to KL30 or CAN transceiver INH pin |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional as signal pin |
| EP | Exposed thermal pad | Required connection to solid GND plane; primary thermal path - not optional |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RDS(on) typ eliminates external FET, reducing BOM count and layout area by >30% |
| Automotive temperature range | -40°C to +125°C ambient operation with 150°C max junction - qualified per AEC-Q100 Grade 0 |
| Ultra-low quiescent current | 30µA standby current enables >1-year battery life in always-on vehicle sensors |
| High-duty-cycle undervoltage operation | 98% max duty cycle at 2.2MHz maintains 5V output during 6V cold-crank events |
| Spread-spectrum EMI reduction | ±6% triangular modulation at 2.2MHz base frequency lowers peak EMI by >10dB without layout changes |
| Robust protection suite | Includes overcurrent limit (2.4–4A), overvoltage (110% VFB), thermal shutdown (175°C), and short-circuit recovery |
Applications
| ADAS Camera Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers 5MP image sensor and ISP in rear-view camera module mounted near bumper, exposed to under-hood thermal cycling and load-dump transients. IC Role / Device Role / Timing Role: Primary buck regulator converting 12V battery to stable 5V/2A rail; provides PGOOD signal for sensor initialization sequencing. Use Value: 42V transient tolerance prevents latch-up during jump-start; 30µA IQ extends parking-mode runtime; 98% duty cycle sustains output during engine cranking. |
Use Scenario: Generates 3.3V core supply for ARM-based infotainment head unit processor from 12V battery, co-located with CAN/LIN transceivers and audio codecs. IC Role / Device Role / Timing Role: Point-of-load converter with EN controlled by CAN transceiver INH pin; synchronized to system clock via FSYNC to minimize EMI coupling into analog audio paths. Use Value: Spread-spectrum mode reduces conducted EMI below CISPR 25 Class 5 limits; dual SUP/SUPSW inputs isolate digital noise from analog bias domains. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) Subsystem |
Use Scenario: Supplies 5V rail to LTE modem, GNSS receiver, and secure element in cellular-connected TCU installed in trunk compartment. IC Role / Device Role / Timing Role: Main power stage with soft-start (8.5ms) preventing inrush-induced brownout on shared battery bus; PGOOD enables modem firmware boot only after stable voltage. Use Value: 2.2MHz switching allows compact 2.2µH inductor and 22µF ceramic output cap - critical for tight TCU form factor; 5µA shutdown current minimizes parasitic drain. |
Use Scenario: Powers microcontroller, LIN transceiver, and LED drivers in door module requiring reliable operation across 5.5–16V battery range and 40V load-dump events. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in skip mode at <300mA loads; FB pin configured for 5V fixed output to eliminate resistor divider errors. Use Value: 70mΩ internal switch achieves >92% efficiency at 1A/12V→5V; thermal shutdown with 15°C hysteresis prevents thermal runaway in sealed plastic housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480-Q1 | 3.5–36V input, 8A output, 2.1MHz max fSW, 15µA IQ, no spread spectrum | Higher current capability but larger solution size; lacks integrated spread-spectrum EMI reduction | Select when >2A load current or lower IQ is required; verify thermal design for 8A conduction losses |
| TPS62918-Q1 | 3–36V input, 2A output, 1–2.2MHz fSW, 12µA IQ, integrated ferrite-bead filter support | Lower IQ and enhanced EMI filtering, but no FSYNC sync input or 42V transient rating | Select for ultra-low-power always-on nodes where 42V tolerance is not needed; requires external sync if clock alignment is mandatory |
Compared with LM61480-Q1 and TPS62918-Q1, the MAX16977RATE/V+CMF uniquely combines 42V transient tolerance, integrated spread-spectrum, and dual SUP/SUPSW inputs - making it optimal for cost-sensitive, space-constrained ADAS and telematics designs where EMI compliance and cold-crank robustness are non-negotiable.
Availability
MAX16977RATE/V+CMF is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, telematics control units, and body control modules requiring stable component supply across extended temperature and high-reliability automotive programs.
Supply support for MAX16977RATE/V+CMF 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16977RATE/V+CMF belongs to Maxim's automotive-grade power management portfolio, engineered specifically for harsh-environment DC-DC conversion in safety-critical vehicle subsystems with stringent EMI, thermal, and transient requirements.
FAQ
What is the maximum input voltage transient the MAX16977RATE/V+CMF can withstand?
The MAX16977RATE/V+CMF is rated for 42V input transients lasting less than 1 second, as specified in its Absolute Maximum Ratings table. This capability enables reliable operation during automotive load-dump events without requiring external TVS clamping, reducing system-level protection component count and board space. The device remains functional and recovers automatically after the transient subsides.
Does the MAX16977RATE/V+CMF support both fixed and adjustable output voltages?
Yes, the MAX16977RATE/V+CMF supports both configurations: tie FB directly to BIAS for a factory-trimmed 5V ±1.5% output, or connect FB to an external resistive divider between OUT and GND to set any output from 1V to 10V. The feedback reference voltage is tightly regulated at 1.0V ±0.015V across -40°C to +125°C, ensuring accuracy in automotive environments.
How does the MAX16977RATE/V+CMF achieve low EMI in automotive systems?
The MAX16977RATE/V+CMF reduces EMI through three integrated features: adjustable 1–2.2MHz switching frequency (enabling optimal inductor/capacitor selection), external clock synchronization (FSYNC) to align switching edges with system clocks, and factory-enabled spread-spectrum modulation (±6% around 2.2MHz) that lowers peak radiated emissions by >10dB without altering PCB layout or adding filters.
What thermal management provisions does the MAX16977RATE/V+CMF include?
The MAX16977RATE/V+CMF incorporates thermal shutdown at +175°C (typical) with 15°C hysteresis, plus a low thermal resistance package (35°C/W J-A on 4-layer board). Its exposed pad (EP) must be soldered to a large contiguous GND copper pour to dissipate up to 2.286W continuously at +70°C ambient. Derating begins above +70°C at 28.6mW/°C.
Can the MAX16977RATE/V+CMF operate during automotive cold-crank conditions?
Yes, the MAX16977RATE/V+CMF maintains regulation during cold-crank (as low as 3.5V input) by supporting up to 98% duty cycle at 2.2MHz - significantly higher than conventional buck controllers. Its dual-supply architecture (SUP/SUPSW) ensures internal bias remains stable even when SUPSW dips below the output voltage, enabling uninterrupted power to ADAS sensors and ECUs.
MAX16977RATE/V+CMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX16977RATE/V+CMF FAQ
1.How can I place an order for MAX16977RATE/V+CMF through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977RATE/V+CMF 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 MAX16977RATE/V+CMF reliable?
The price and inventory of MAX16977RATE/V+CMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16977RATE/V+CMF is usually 5 days.
3.What payment methods are accepted for MAX16977RATE/V+CMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977RATE/V+CMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977RATE/V+CMF?
MAX16977RATE/V+CMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977RATE/V+CMF 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 MAX16977RATE/V+CMF?
For technical support, including MAX16977RATE/V+CMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977RATE/V+CMF requirements.
6.How does Aetrix verify that MAX16977RATE/V+CMF is sourced from the original manufacturer or authorized distributors?
All MAX16977RATE/V+CMF 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 MAX16977RATE/V+CMF meets industry standards.
7.What is the process for return or replacement of MAX16977RATE/V+CMF?
All MAX16977RATE/V+CMF units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977RATE/V+CMF, 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 MAX16977RATE/V+CMF part is unused and in its original packaging.
Return procedure for MAX16977RATE/V+CMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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