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Analog Devices Inc./Maxim Integrated MAX16975BAEE/V+
- Part No.:
- MAX16975BAEE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX16975BAEE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 1.2A 16QSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX16975BAEE/V+ from Maxim Integrated is a 1.2A automotive-grade current-mode step-down 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/V+ datasheet, MAX16975BAEE/V+ pinout, MAX16975BAEE/V+ application, or MAX16975BAEE/V+ equivalent, key selection criteria include cold-crank robustness (94% duty cycle), programmable reset threshold (via RESETI), capacitor-adjustable reset timeout (CRES), and 42V transient tolerance-critical for 12V/24V automotive systems under load dump.
Technical Context
The MAX16975BAEE/V+ implements constant-frequency current-mode control with internal 1.2A high-side switch and integrated bootstrap diode. Its oscillator supports both resistor tuning (FOSC pin) and external synchronization (FSYNC), enabling EMI optimization and multi-rail timing alignment in clustered power domains.
It combines dual-supply operation (SUP/SUPSW inputs), BIAS linear regulator (5V ±3%, 4.7–5.3V), and dropout recovery logic that forces periodic LX pull-down to refresh BST voltage-even at no load and 220kHz. Reset assertion occurs at 93% of programmed VOUT level, with hysteresis and timeout fully configurable via external resistors and capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 28V - supports full automotive battery range including cold-crank (down to 3.5V) and ISO 7637-2 pulse 5a (42V transient tolerance) |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, CAN transceivers, and sensor interfaces without external boost stages |
| Quiescent Current | 45µA in skip mode - enables always-on subsystems (e.g., body control modules) to meet <100µA total system standby targets |
| Switching Frequency | 220kHz to 1.0MHz - adjustable via FOSC resistor or synchronized externally via FSYNC to avoid noise coupling in sensitive RF/analog sections |
| Output Voltage Options | Fixed 5V or 1V–10V adjustable - eliminates feedback resistor network for 5V rails; supports diverse SoC core/I/O voltages with single IC |
| Reset Threshold Accuracy | ±1.5% over temperature - ensures reliable microcontroller reset assertion down to lowest valid VOUT (e.g., 93% of 1.25V = 1.16V) |
| Thermal Shutdown | +175°C with +15°C hysteresis - protects against sustained overload in enclosed junction-box environments without latch-off |
Pinout & Package
MAX16975BAEE/V+ is housed in a 16-pin QSOP-EP package with exposed thermal pad (EP), optimized for automotive thermal cycling and board-level reliability. The EP must be soldered to a large contiguous copper ground plane but cannot serve as sole GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CRES | Analog reset timer current source | Sources 10µA (typ) to external capacitor; sets reset timeout period before RES deassertion after VOUT regulation recovery |
| FOSC | Oscillator frequency programming node | Connects to GND via resistor (e.g., 61.9kΩ → 400kHz); enables EMI tuning without changing layout |
| FSYNC | External clock synchronization input | Accepts 3.3V logic-compatible signal; requires 10% higher frequency than internal oscillator for lock acquisition |
| COMP | Error amplifier output | Drives external Type-II/III compensation network; stability depends on pole-zero placement relative to FB loop gain |
| FB | Feedback reference input | 1.0V ±0.5% internal reference; connects to resistive divider for adjustable outputs or directly to BIAS for fixed 5V |
| OUT | Power output node | Delivers regulated voltage; powers internal circuitry when VOUT = 3–5.6V; pulled to GND via 50Ω during shutdown |
| BIAS | Linear regulator output | 5V ±3% supply for internal logic; bypassed with 1µF ceramic; automatically disabled when VOUT regulates within 3–5.5V range |
| BST | Bootstrap capacitor connection | Requires 0.1µF ceramic between BST and LX; refreshed internally during dropout to sustain gate drive above VOUT |
| SUP / SUPSW | Dual input supply pins | SUP powers bias LDO; SUPSW powers high-side switch; both require 4.7µF input capacitance and must be shorted externally |
| EN | Enable control input | 3.3V–42V compatible; asserts device above 2.2V, disables below 0.8V; draws only 10nA leakage in shutdown |
| RES | Open-drain active-low reset output | Asserts low when VOUT falls below reset threshold; sinks ≥5mA; requires external pull-up for logic-level compatibility |
| RESETI | Reset threshold programming input | Accepts resistive divider from OUT/GND; sets reset point using 1.25V internal reference; connect to GND for default 95% VOUT threshold |
| LX | Switch node | Connects to inductor and Schottky catch diode; voltage swings from GND to VIN; critical for EMI filtering and thermal management |
| GND | Signal and power ground | Primary return path; EP must be connected to same ground plane but not substituted for pin 8 GND |
Key Features
| Feature | Design Value |
|---|---|
| 42V input transient tolerance | Withstands ISO 7637-2 pulse 5a load dump without external TVS, reducing BOM count and PCB area in front-end power stages |
| Adjustable reset timeout (CRES) | Enables precise power-up sequencing for multi-rail SoCs by delaying RES deassertion until all supplies stabilize-configurable from 1ms to >1s |
| Internal boost diode | Eliminates need for external bootstrap diode, simplifying layout and improving reliability in high-vibration automotive environments |
| 94% cold-crank duty cycle | Maintains regulation during engine start (VIN ≈ 6V) by extending on-time, preventing MCU brownout in critical ignition sequences |
| Less than 10µA shutdown current | Meets OEM requirements for ultra-low-power sleep modes in telematics and gateway ECUs with battery backup |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in head-unit with variable 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V buck regulator with synchronized FSYNC to align switching edges away from video pixel clock harmonics. Use Value: 45µA skip-mode current extends battery runtime during vehicle-off infotainment standby; 42V tolerance avoids external protection. |
Use Scenario: Supplies image sensor and ISP in rear-view camera exposed to wide ambient temperature swings (-40°C to +105°C). IC Role / Device Role / Timing Role: Adjustable 1.2V/1.8V/3.3V output buck converter with programmable reset to ensure clean sensor initialization after cold crank. Use Value: –40°C to +125°C operation guarantees startup at extreme temperatures; 94% duty cycle sustains output during engine cranking. |
| Body Control Module (BCM) | Automotive Gateway ECU |
|
Use Scenario: Powers microcontroller, LIN transceivers, and LED drivers in door module with intermittent loads and long-term battery drain constraints. IC Role / Device Role / Timing Role: Always-on 5V regulator with CRES-configured reset timeout to coordinate wake-up sequence after key-off events. Use Value: <10µA shutdown current meets OEM <20µA total BCM leakage spec; EN pin accepts direct KL30 battery connection. |
Use Scenario: Generates isolated 3.3V and 5V rails for CAN FD, Ethernet AVB, and security MCU in central gateway with multi-source clocking. IC Role / Device Role / Timing Role: Synchronized buck converter (FSYNC) referenced to master clock domain to minimize jitter-induced packet loss. Use Value: External clock sync eliminates beat frequencies between power and communication clocks; thermal shutdown prevents latch-up during CAN bus fault conditions. |
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, 3.3V–36V input, but 40µA IQ (vs. 45µA) and no CRES-programmable reset timeout | Preferred for high-current clusters (e.g., HVAC control); lacks fine-grained reset timing control needed for multi-SoC sequencing | Select MAX16975BAEE/V+ when reset timeout precision and cold-crank duty cycle >90% are mandatory |
| TPS62903-Q1 | Lower 3A rating, 3V–18V input, 15µA IQ, but no 42V transient rating or adjustable reset threshold | Suitable for interior modules with stable 12V supply; cannot replace MAX16975BAEE/V+ in engine bay or front radar applications | Choose MAX16975BAEE/V+ for under-hood deployment requiring 42V tolerance and programmable reset activation level |
Compared with LM61480-Q1 and TPS62903-Q1, MAX16975BAEE/V+ uniquely delivers cold-crank-ready 94% duty cycle, CRES-based reset timing, and 42V transient immunity-making it irreplaceable in safety-critical power domains where deterministic reset behavior and load-dump survival are non-negotiable.
Availability
MAX16975BAEE/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, body control units, and gateway ECUs requiring stable component supply across extended temperature and qualification lifecycles.
Supply support for MAX16975BAEE/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
Maxim Integrated, now part of Analog Devices, designs high-reliability analog and mixed-signal ICs for automotive, industrial, and communications markets with emphasis on power efficiency and ruggedness.
The MAX16975BAEE/V+ belongs to Maxim's automotive power management portfolio, engineered specifically for ASIL-B compliant subsystems requiring cold-crank resilience, low-IQ operation, and precise power-good signaling in harsh environments.
FAQ
What is the maximum input voltage transient the MAX16975BAEE/V+ can withstand?
The MAX16975BAEE/V+ tolerates up to 42V input transients per ISO 7637-2 Pulse 5a, enabling direct connection to automotive battery rails without external TVS diodes. This rating is validated across the full –40°C to +125°C operating range and applies to both SUP and SUPSW pins. Absolute maximum ratings specify –0.3V to +45V for SUP/SUPSW-to-GND, confirming robustness beyond typical load-dump conditions.
How does the MAX16975BAEE/V+ maintain regulation during cold-crank events?
The MAX16975BAEE/V+ sustains output regulation during cold-crank (VIN ≈ 3.5V–6V) by dynamically extending the high-side switch on-time to 94% duty cycle. This behavior is implemented in hardware via internal dropout detection logic and does not require external configuration. The device continues regulating down to its minimum input voltage while maintaining tight output accuracy (±1%) and controlled soft-start ramp.
Can the MAX16975BAEE/V+ operate with a fixed 5V output without external resistors?
Yes, the MAX16975BAEE/V+ supports fixed 5V output by connecting the FB pin directly to the BIAS pin-eliminating the need for an external resistive divider. In this configuration, the internal 1.0V reference and BIAS voltage (5.0V ±3%) set VOUT to 5.0V ±1.5%. This reduces component count and improves accuracy versus resistor-based solutions subject to tolerance stacking.
What is the function of the CRES pin on the MAX16975BAEE/V+?
The CRES pin on the MAX16975BAEE/V+ sources a precise 10µA (typ) current into an external capacitor to define the reset timeout period. When VOUT falls out of regulation, RES asserts low and CRES discharges the capacitor with 1mA pulldown current; upon recovery, CRES recharges it at 10µA. RES remains low until CRES voltage reaches 1.13V (typ), enabling programmable delay from 1ms to seconds based on capacitor value.
Does the MAX16975BAEE/V+ require an external bootstrap diode?
No, the MAX16975BAEE/V+ integrates a bootstrap diode, eliminating the need for an external component between BST and SUPSW. This reduces bill-of-materials cost, PCB footprint, and potential failure points in high-vibration automotive applications. The internal diode is rated for the full 1.2A switch current and supports the device's dropout refresh algorithm without derating.
MAX16975BAEE/V+ 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:
- 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):
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX16975BAEE/V+ FAQ
1.How can I place an order for MAX16975BAEE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16975BAEE/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 MAX16975BAEE/V+ reliable?
The price and inventory of MAX16975BAEE/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16975BAEE/V+ is usually 5 days.
3.What payment methods are accepted for MAX16975BAEE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16975BAEE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16975BAEE/V+?
MAX16975BAEE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16975BAEE/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 MAX16975BAEE/V+?
For technical support, including MAX16975BAEE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16975BAEE/V+ requirements.
6.How does Aetrix verify that MAX16975BAEE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16975BAEE/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 MAX16975BAEE/V+ meets industry standards.
7.What is the process for return or replacement of MAX16975BAEE/V+?
All MAX16975BAEE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16975BAEE/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 MAX16975BAEE/V+ part is unused and in its original packaging.
Return procedure for MAX16975BAEE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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