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Analog Devices Inc./Maxim Integrated MAX16975BAEE+CFY
- Part No.:
- MAX16975BAEE+CFY
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX16975BAEE+CFY.pdf
- Description:
- IC REG BUCK ADJ/1V 1.2A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
MAX16975BAEE+CFY from Maxim Integrated is an automotive-grade 1.2A synchronous step-down DC-DC converter with integrated high-side MOSFET, operating from 3.5V to 28V input and delivering fixed 5V or adjustable 1V–10V output. It features 45µA skip-mode quiescent current, 220kHz–1.0MHz resistor-programmable switching frequency, and operates across –40°C to +125°C for engine control units and ADAS power rails.
For engineers reviewing the MAX16975BAEE+CFY datasheet, MAX16975BAEE+CFY pinout, MAX16975BAEE+CFY application, or MAX16975BAEE+CFY equivalent, key selection criteria include cold-crank robustness (94% duty cycle), 42V transient tolerance, programmable reset threshold via RESETI, and thermal shutdown with automatic recovery - all validated for AEC-Q100-compliant automotive designs.
Technical Context
This current-mode buck controller integrates a 1.2A high-side switch with internal boost diode and 5V BIAS LDO, enabling self-powered operation when VOUT is 3–5.5V. Its adaptive dropout refresh algorithm maintains BST capacitor voltage during deep undervoltage events by forcing periodic LX pull-down and activating a 100mA internal load.
The device implements dual protection layers: cycle-by-cycle current limiting with 1.5–2.0A LX current limit, and overvoltage shutdown at +12% VOUT deviation. Reset timing is capacitor-programmable via CRES (10µA source), while FSYNC accepts external clocks up to 10% faster than internal fOSC for EMI reduction in clustered power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 28V - supports 12V/24V automotive batteries and withstands cold-crank dips down to 3.5V |
| Output Current | 1.2A continuous - sustains full load at +125°C ambient with QSOP-EP package's 44°C/W θJA |
| Quiescent Current | 45µA in skip mode - enables always-on subsystems (e.g., CAN wake-up receivers) without battery drain |
| Switching Frequency | 220kHz to 1.0MHz - adjustable via single resistor on FOSC pin for layout-optimized efficiency/noise trade-offs |
| Reset Threshold Accuracy | ±1.5% of VFB (0.985V–1.015V) - ensures precise microcontroller brown-out detection across temperature |
| Thermal Shutdown | +175°C with +15°C hysteresis - prevents latch-up during sustained overload while allowing safe recovery |
| Transient Tolerance | 42V for 100ms - survives load-dump events per ISO 7637-2 Pulse 5a without external clamping |
Pinout & Package
MAX16975BAEE+CFY is housed in a 16-pin thermally enhanced QSOP-EP package (5.0mm × 6.2mm, 0.635mm pitch) with exposed pad connected to GND for optimal thermal dissipation (θJC = 6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CRES | Analog reset timer node | Sources 10µA to external capacitor; sets RES timeout period (t = 1.13V × C / 10µA) |
| 2 FOSC | Oscillator frequency programming | Resistor-to-GND sets fSW from 220kHz–1.0MHz; enables EMI spread-spectrum tuning |
| 3 FSYNC | External clock synchronization input | Accepts 10% faster clock than internal fOSC; eliminates beat frequencies in multi-rail systems |
| 4 I.C. | Internally connected | Must be tied to GND; no external connection or routing required |
| 5 COMP | Error amplifier output | Connect Type II/III compensation network to stabilize loop response across line/load transients |
| 6 FB | Feedback reference input | 1.0V ±1.5% internal reference; connects to resistive divider for adjustable VOUT or directly to BIAS for 5V fixed |
| 7 OUT | Power output node | Supplies internal circuitry when VOUT = 3–5.5V; actively pulled to GND via 50Ω during shutdown |
| 8 GND | Signal and power ground | Main return path; EP pad must connect to large copper pour for thermal performance |
| 9 BIAS | 5V linear regulator output | Bypassed with 1µF ceramic; powers internals until VOUT regulates, then switches to VOUT supply |
| 10 BST | Bootstrap capacitor connection | 0.1µF capacitor between BST–LX enables high-side gate drive; critical for dropout operation |
| 11 SUP | Internal LDO input | Connected to SUPSW; requires 4.7µF ceramic bypass to support bias regulator under transients |
| 12 LX | Switch node | Drives external inductor; Schottky catch diode required if synchronous rectification not used |
| 13 SUPSW | High-side switch supply | Directly tied to SUP; powers integrated MOSFET driver; decoupled with 4.7µF ceramic |
| 14 EN | Enable input | 3.3V–42V compatible; 0.8V/2.2V logic thresholds with 0.2V hysteresis; 10nA input leakage |
| 15 RES | Open-drain active-low reset | Asserts when VOUT < 93% of programmed threshold; sinks 5mA max; debounced 25µs |
| 16 RESETI | Reset threshold programming | 1.25V reference input; connect resistive divider from OUT–RESETI–GND to set custom reset point |
Key Features
| Feature | Design Value |
|---|---|
| 42V input transient tolerance | Withstands ISO 7637-2 Pulse 5a load-dump without external TVS, reducing BOM count and board area |
| Adjustable power-good timing | CRES capacitor sets RES assertion delay post-startup, ensuring reliable microcontroller initialization sequencing |
| 94% cold-crank duty cycle | Maintains regulation during engine cranking (as low as 3.5V VIN) by extending on-time beyond normal limits |
| Integrated boost diode | Eliminates external bootstrap diode, simplifying layout and improving reliability in high-vibration environments |
| 10µA shutdown current | Enables zero-power sleep modes in telematics and infotainment systems meeting OEM quiescent current targets |
| Automatic BST refresh in dropout | Internal algorithm forces LX pull-down and activates 100mA load to recharge BST cap when VIN ≈ VOUT |
Applications
| Engine Control Unit (ECU) Power Supply | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers 3.3V/5V rails for microcontrollers, sensors, and CAN transceivers in under-hood ECUs exposed to wide temperature swings and load-dump transients. IC Role / Device Role / Timing Role: Primary 12V-to-5V buck regulator with cold-crank support and reset supervision for MCU brown-out recovery. Use Value: 45µA skip-mode IQ extends battery life during vehicle sleep; 42V transient tolerance eliminates need for external clamping diodes. |
Use Scenario: Supplies vision processor SoCs and radar MMICs in front-camera modules requiring stable 1.2V/1.8V/3.3V rails with tight voltage accuracy. IC Role / Device Role / Timing Role: Pre-regulator feeding downstream low-noise LDOs; synchronized via FSYNC to avoid beat frequencies with image sensor clocks. Use Value: Resistor-programmable fOSC allows optimization for low EMI in compact camera housings; -40°C to +125°C rating ensures operation in sealed enclosures. |
| Automotive Infotainment Head Unit | Body Control Module (BCM) |
Use Scenario: Generates 5V for USB ports, display backlight drivers, and audio codecs in center-stack head units with variable input voltage during start-stop cycles. IC Role / Device Role / Timing Role: Main system power converter with EN controlled by ignition signal; RES monitors output to prevent firmware corruption during voltage sag. Use Value: Adjustable reset threshold (via RESETI) aligns with SoC-specific brown-out levels; 1.2A output supports multiple USB charging ports simultaneously. |
Use Scenario: Powers door module MCUs, LIN transceivers, and LED drivers in distributed body electronics where space and thermal constraints are severe. IC Role / Device Role / Timing Role: Compact, thermally efficient 5V supply using QSOP-EP package; CRES-programmed reset timeout ensures proper boot sequence after wake-up. Use Value: Exposed pad reduces θJA to 44°C/W, enabling operation at +105°C ambient without heatsinks; 10µA shutdown current meets BCM sleep-mode requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480-Q1 | Higher 4.5A output, 3.5V–36V input, but 40µA IQ and no integrated BIAS LDO | Requires external 5V bias supply; better suited for high-current ADAS domain controllers | Select when >1.2A load current or >28V input margin is needed; MAX16975BAEE+CFY preferred for cost-sensitive 5V-only systems |
| TPS62933-Q1 | Lower 3A rating, 3V–18V input, 15µA IQ, but no cold-crank support or 42V tolerance | Lacks 94% duty cycle and load-dump protection; limited to cabin electronics only | Choose for infotainment subsystems with stable 12V input; MAX16975BAEE+CFY remains optimal for under-hood deployment |
Compared with LM61480-Q1 and TPS62933-Q1, MAX16975BAEE+CFY uniquely combines cold-crank robustness, integrated BIAS LDO, and 42V transient tolerance in a thermally optimized QSOP-EP package - making it the most direct fit for AEC-Q100-compliant ECU and BCM power stages.
Availability
MAX16975BAEE+CFY is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, infotainment head units, and body control modules requiring stable component supply with AEC-Q100 qualification and long-term automotive lifecycle support.
Supply support for MAX16975BAEE+CFY 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, designs precision analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets.
The MAX16975BAEE+CFY belongs to Maxim's automotive power-management portfolio, engineered specifically for harsh-environment DC-DC conversion in engine compartments and ADAS subsystems with stringent cold-crank, load-dump, and thermal requirements.
FAQ
What is the maximum input voltage transient the MAX16975BAEE+CFY can withstand?
The MAX16975BAEE+CFY tolerates 42V input transients for up to 100ms, complying with ISO 7637-2 Pulse 5a load-dump requirements. This eliminates the need for external TVS diodes in most automotive applications, reducing bill-of-materials cost and PCB area. The device resumes normal operation automatically after the transient subsides without requiring a reset or re-enabling sequence.
How does the MAX16975BAEE+CFY maintain regulation during cold-crank conditions?
The MAX16975BAEE+CFY achieves 94% effective duty cycle during cold-crank events (VIN as low as 3.5V) by dynamically extending the high-side switch on-time beyond standard PWM limits. Its internal algorithm also activates a 100mA internal load to ensure BST capacitor recharge when VIN approaches VOUT, sustaining gate drive capability throughout the crank cycle.
Can the MAX16975BAEE+CFY operate with a fixed 5V output without external resistors?
Yes, the MAX16975BAEE+CFY supports fixed 5V output by connecting the FB pin directly to the BIAS pin - no external feedback resistors required. This configuration reduces component count, improves accuracy (±1% typical over temperature), and lowers quiescent current by up to 50µA compared to adjustable configurations.
What is the purpose of the CRES pin on the MAX16975BAEE+CFY?
The CRES pin on the MAX16975BAEE+CFY sources a precise 10µA current to charge an external capacitor, setting the reset timeout period before the RES pin deasserts after startup. The timeout duration is calculated as t = (1.13V × C) / 10µA, enabling customizable power-supply sequencing for microcontrollers with specific initialization windows.
Does the MAX16975BAEE+CFY require an external bootstrap diode?
No, the MAX16975BAEE+CFY integrates a bootstrap diode internally, eliminating the need for an external component between BST and SUPSW. This simplifies PCB layout, improves reliability in high-vibration automotive environments, and reduces solution size - particularly valuable in space-constrained modules like radar sensors or camera ECUs.
MAX16975BAEE+CFY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 28V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 220kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX16975BAEE+CFY FAQ
1.How can I place an order for MAX16975BAEE+CFY through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16975BAEE+CFY 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 MAX16975BAEE+CFY reliable?
The price and inventory of MAX16975BAEE+CFY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16975BAEE+CFY is usually 5 days.
3.What payment methods are accepted for MAX16975BAEE+CFY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16975BAEE+CFY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16975BAEE+CFY?
MAX16975BAEE+CFY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16975BAEE+CFY 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 MAX16975BAEE+CFY?
For technical support, including MAX16975BAEE+CFY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16975BAEE+CFY requirements.
6.How does Aetrix verify that MAX16975BAEE+CFY is sourced from the original manufacturer or authorized distributors?
All MAX16975BAEE+CFY 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 MAX16975BAEE+CFY meets industry standards.
7.What is the process for return or replacement of MAX16975BAEE+CFY?
All MAX16975BAEE+CFY units undergo pre-shipment inspection (PSI). If there is an issue with MAX16975BAEE+CFY, 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 MAX16975BAEE+CFY part is unused and in its original packaging.
Return procedure for MAX16975BAEE+CFY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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