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Analog Devices Inc./Maxim Integrated MAX16977SATE/V+CMF
- Part No.:
- MAX16977SATE/V+CMF
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16977SATE/V+CMF.pdf
- Description:
- IC REG BUCK ADJ/1V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
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Product details
Overview
MAX16977SATE/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. It delivers regulated 5V fixed or 1V–10V adjustable output for automotive infotainment power rails.
For engineers reviewing the MAX16977SATE/V+CMF datasheet, MAX16977SATE/V+CMF pinout, MAX16977SATE/V+CMF application, or MAX16977SATE/V+CMF equivalent, key selection considerations include its 42V transient tolerance, 98% max duty cycle during cold-crank, spread-spectrum EMI reduction (S-version), PGOOD monitoring, and dual supply inputs (SUP/SUPSW) enabling robust battery-direct operation.
Technical Context
The MAX16977SATE/V+CMF implements constant-frequency current-mode control with internal transconductance error amplifier (gm = 900µS), 80ns minimum on-time, and fast load-transient response via optimized loop architecture. Its dual-supply topology separates bias regulation (SUP → BIAS LDO) from switch drive (SUPSW → LX), enabling stable operation down to 3.5V input during undervoltage events.
It supports three operating modes: forced PWM (full load), skip mode (light load, <300mA), and shutdown (5µA IQ). Protection includes overcurrent limit (2.4–4A ILX), overvoltage trip (105–115% VFB), thermal shutdown at +175°C with 15°C hysteresis, and 42V input transient tolerance - all verified across -40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports direct connection to automotive battery with cold-crank margin |
| Output Current | 2A continuous - sustains full load without external FET or heatsink in TQFN package |
| Switching Frequency | 1MHz to 2.2MHz - resistor-programmable (RFOSC) or synchronizable to external clock |
| Quiescent Current | 30µA at no load - enables always-on systems meeting OEM standby power budgets |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (external resistive divider) |
| Thermal Range | -40°C to +125°C ambient - qualified for under-hood automotive applications |
| Protection Features | Overcurrent, overvoltage (110% VFB), thermal shutdown (+175°C), and short-circuit safe |
Pinout & Package
MAX16977SATE/V+CMF is packaged in a 16-pin TQFN (5mm × 5mm) with exposed pad (EP), optimized for thermal dissipation in space-constrained automotive modules. The exposed pad must be soldered to a large contiguous copper ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | External clock sync input | Accepts >10% higher frequency than internal oscillator for EMI-controlled system timing alignment |
| 2 (FOSC) | Frequency-setting resistor node | Connects to GND via RFOSC (e.g., 12kΩ for 2.2MHz); sets switching frequency and influences component size |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% VFB; enables safe power sequencing with downstream ICs |
| 4 (OUT) | Regulated output node | Delivers up to 2A; powers internal circuitry when VOUT = 3–5V in standby mode |
| 5 (FB) | Feedback input | Connects to BIAS for 5V fixed output; connects to resistive divider for 1V–10V adjustment (VFB = 1.0V) |
| 6 (COMP) | Error amplifier output | Connects to RC compensation network (CCOMP1/RCOMP) for loop stability across line/load transients |
| 7 (BIAS) | Internal 5V LDO output | Powers internal logic; requires 1µF ceramic bypass to GND; UVLO threshold = 3.1V |
| 8 (GND) | Analog/digital ground reference | Primary return path; EP must be connected to same ground plane for thermal and noise integrity |
| 9 (BST) | Bootstrap supply for high-side gate driver | Requires 0.1µF capacitor between BST and LX to sustain gate drive during high-duty-cycle operation |
| 10 (SUP) | Main supply input for bias regulator | Accepts 3.5–36V; powers internal LDO (BIAS); decouple with 1µF ceramic to GND |
| 11–12 (LX) | Switching node | Connects to Schottky diode cathode and inductor; handles peak currents up to 3A RMS |
| 13–14 (SUPSW) | High-side switch supply input | Separate 3.5–36V input for MOSFET driver; decouple with 1µF + 4.7µF ceramics to GND |
| 15 (EN) | Enable input | Logic-compatible (3.3V–36V); high = active; low = 5µA shutdown; hysteresis = 0.2V |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional; ensures proper internal biasing |
| EP | Exposed thermal pad | Not electrically active; mandatory connection to solid GND plane for thermal performance (θJA = 35°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A high-side switch | 70mΩ RON (typ) eliminates external FET, reduces BOM count and PCB area in 5V/2A point-of-load designs |
| Automotive cold-crank support | 98% max duty cycle at 2.2MHz enables regulation during 3.5V battery dips without output collapse |
| Spread-spectrum modulation | ±6% frequency dithering (factory-enabled in S-version) lowers peak EMI by >10dB without layout changes |
| Power-good (PGOOD) monitor | Dual-threshold (92.5%/95% VFB) open-drain output simplifies power sequencing in multi-rail automotive ECUs |
| Low-IQ standby mode | 30µA IQ at no load meets OEM requirements for always-on telematics and ADAS wake-up circuits |
| Robust protection suite | 42V transient tolerance, overvoltage lockout, thermal shutdown with auto-recovery, and short-circuit safe operation |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Power |
|---|---|
Use Scenario: Powers SoC, DSP, and display interface in head-unit systems with 12V battery input subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 2A with PGOOD sequencing to enable downstream processors and memory. Use Value: 42V transient tolerance and 98% duty cycle prevent brownout during engine start; 30µA IQ extends battery life in parked mode. |
Use Scenario: Supplies clean 3.3V rail to CMOS image sensor and ISP in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Adjustable-output buck converter (set via FB divider) providing precise 3.3V ±1% with fast transient response to sensor burst modes. Use Value: 80ns min on-time and current-mode control ensure <50mV overshoot during 100mA–2A load steps; TQFN package fits tight camera housing. |
| Industrial CAN Gateway Power | Telematics Control Unit (TCU) Core Rail |
Use Scenario: Generates isolated 5V for CAN transceiver and microcontroller in vehicle-to-infrastructure (V2I) gateways deployed in harsh environments. IC Role / Device Role / Timing Role: Input-tolerant buck converter accepting wide 9–36V industrial input; synchronized to system clock via FSYNC to reduce EMI coupling into CAN bus. Use Value: Frequency synchronization eliminates beat frequencies with CAN bit timing; thermal shutdown protects against enclosure overheating. |
Use Scenario: Provides main 1.2V/1.8V core voltage for cellular modem and GPS SoC in LTE/5G TCUs requiring always-on connectivity. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in skip mode during idle; PGOOD signals host MCU when rail is stable post-power-up. Use Value: 5µA shutdown current enables >10-year battery backup life; spread-spectrum option suppresses harmonics interfering with GNSS reception. |
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 | 4.5–36V input, 3.5A, 2.1MHz, 15µA IQ, no spread spectrum, different pinout | Higher current, lower IQ, but lacks PGOOD and FSYNC sync capability | Choose LM61480-Q1 only if >2A load or sub-15µA IQ is mandatory; re-layout required due to non-pin-compatible footprint |
| TPS62933-Q1 | 3–36V input, 3A, 1–2.5MHz, 12µA IQ, integrated compensation, no BIAS LDO | Higher efficiency at light load, but requires external bias supply and lacks cold-crank duty-cycle optimization | Prefer TPS62933-Q1 for ultra-low-noise applications where BIAS LDO is unnecessary; verify cold-crank behavior per design |
Compared with LM61480-Q1 and TPS62933-Q1, MAX16977SATE/V+CMF uniquely combines PGOOD monitoring, FSYNC synchronization, factory spread-spectrum, and 98% cold-crank duty cycle - making it optimal for safety-critical automotive subsystems requiring deterministic power sequencing and EMI control.
Availability
MAX16977SATE/V+CMF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial CAN gateway designs requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX16977SATE/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 MAX16977 belongs to Maxim's automotive-grade power management portfolio, designed specifically for demanding 12V/24V battery-fed systems requiring high input voltage tolerance, low quiescent current, and robust transient response.
FAQ
What is the maximum input voltage transient the MAX16977SATE/V+CMF can withstand?
The MAX16977SATE/V+CMF is rated for 42V input transients lasting less than 1 second, as specified in its Absolute Maximum Ratings. This capability enables reliable operation during automotive load-dump events without external clamping circuitry. The device remains functional and protected throughout the transient, resuming normal regulation once voltage returns within the 3.5V–36V operating range. This rating is validated across the full -40°C to +125°C temperature range.
Does the MAX16977SATE/V+CMF support fixed 5V output without external resistors?
Yes, the MAX16977SATE/V+CMF supports fixed 5V output by connecting the FB pin directly to the BIAS pin - eliminating the need for an external feedback resistor divider. In this configuration, the output is tightly regulated to 4.925V–5.075V (±1.5%) over temperature and line, with 30µA quiescent current. This simplifies design for cost-sensitive automotive applications where 5V is the standard I/O rail.
How does the MAX16977SATE/V+CMF achieve fast load-transient response?
The MAX16977SATE/V+CMF achieves fast load-transient response through a current-mode control architecture enhanced with an optimized transconductance error amplifier (gm = 900µS) and 80ns minimum on-time. This allows immediate duty-cycle correction during rapid load steps (e.g., 100mA to 2A), limiting output deviation to <50mV. The integrated high-side switch and low-inductance TQFN package further reduce parasitic delays critical for camera and radar module power integrity.
What is the purpose of the separate SUP and SUPSW pins on the MAX16977SATE/V+CMF?
The MAX16977SATE/V+CMF uses separate SUP and SUPSW pins to isolate bias regulation from high-side switch drive. SUP powers the internal 5V BIAS LDO and control logic, while SUPSW supplies the gate driver for the integrated 70mΩ high-side MOSFET. This dual-supply architecture maintains regulation during cold-crank (e.g., 3.5V battery) by allowing SUPSW to drop below VOUT while SUP sustains internal logic - enabling 98% duty cycle operation without system reset.
Is spread-spectrum operation enabled by default on the MAX16977SATE/V+CMF?
No - spread-spectrum modulation is factory-configured and only active on the "S" version of the MAX16977 (e.g., MAX16977SATE/V+CMF). It provides ±6% triangular frequency dithering around the base 2.2MHz switching frequency to reduce EMI peaks. When synchronized to an external clock via FSYNC, spread-spectrum is automatically disabled; however, the device accepts externally generated spread-spectrum clocks. Non-S versions lack this feature entirely.
MAX16977SATE/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)
MAX16977SATE/V+CMF FAQ
1.How can I place an order for MAX16977SATE/V+CMF through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16977SATE/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 MAX16977SATE/V+CMF reliable?
The price and inventory of MAX16977SATE/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 MAX16977SATE/V+CMF is usually 5 days.
3.What payment methods are accepted for MAX16977SATE/V+CMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16977SATE/V+CMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16977SATE/V+CMF?
MAX16977SATE/V+CMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16977SATE/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 MAX16977SATE/V+CMF?
For technical support, including MAX16977SATE/V+CMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16977SATE/V+CMF requirements.
6.How does Aetrix verify that MAX16977SATE/V+CMF is sourced from the original manufacturer or authorized distributors?
All MAX16977SATE/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 MAX16977SATE/V+CMF meets industry standards.
7.What is the process for return or replacement of MAX16977SATE/V+CMF?
All MAX16977SATE/V+CMF units undergo pre-shipment inspection (PSI). If there is an issue with MAX16977SATE/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 MAX16977SATE/V+CMF part is unused and in its original packaging.
Return procedure for MAX16977SATE/V+CMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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