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Analog Devices Inc./Maxim Integrated MAX16956AUBB+
- Part No.:
- MAX16956AUBB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX16956AUBB+.pdf
- Description:
- IC REG BUCK 3.3V 300MA 10UMAX
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Inventory:3,805
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Product details
Overview
MAX16956AUBB+ from Analog Devices is a 3.3V fixed-output, 300mA synchronous buck converter with integrated high-side and low-side MOSFETs, 2.1MHz switching frequency, 1.1µA quiescent current in skip mode, and AEC-Q100 qualification for automotive body ECUs under cold-crank conditions.
For engineers reviewing the MAX16956AUBB+ datasheet, MAX16956AUBB+ pinout, MAX16956AUBB+ application, or MAX16956AUBB+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance for point-of-load DC-DC conversion in harsh environments.
Technical Context
The MAX16956AUBB+ implements current-mode PWM control with integrated slope compensation and load-line architecture to reduce output capacitance requirements while maintaining ±1% output voltage accuracy across 0–300mA load and 3.5V–36V input range. It features cycle-by-cycle peak-current limiting and thermal shutdown at +175°C with +15°C hysteresis.
Its 2.1MHz fixed-frequency operation enables compact 10µH inductors and ceramic capacitors, while the 97% max duty cycle supports dropout operation during automotive cold-crank (e.g., VSUP dropping to 3.5V). The device uses internal transconductance error amplification and integrated high-side current sensing-eliminating external compensation and sensitive current-sense routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over full temperature and load range-ensures stable logic supply for microcontrollers and sensors without external feedback components. |
| Max Output Current | 300mA continuous-supports multiple automotive peripherals (e.g., LIN transceivers, CAN PHY biasing, sensor signal conditioning) from single rail. |
| Input Voltage Range | 3.5V to 36V, with 42V transient tolerance-covers full automotive battery range including load dump (42V) and cold-crank (3.5V). |
| Quiescent Current | 1.1µA in skip mode (no load)-meets OEM standby power budgets for always-on modules like door modules and seat controllers. |
| Switching Frequency | 2.1MHz ±5%-enables use of small 10µH inductors and avoids AM radio band (0.53–1.71MHz), reducing EMI filtering complexity. |
| Operating Temperature | −40°C to +125°C junction-fully rated for under-hood and cabin-mounted automotive electronics per AEC-Q100 Grade 1. |
| Duty Cycle Max | 97%-allows regulation down to 3.5V input while delivering 3.3V output, critical for engine start-up scenarios. |
| Reset Threshold | 92% VOUT rising / 90% VOUT falling-provides precise power-good monitoring for microcontroller reset sequencing. |
Pinout & Package
MAX16956AUBB+ is housed in a 3mm × 3mm, 10-pin µMAX® package with exposed pad (U10E+3), optimized for thermal dissipation in high-density automotive PCBs. θJA = 77.6°C/W on single-layer board; θJC = 5°C/W enables efficient heat transfer to ground plane via soldered EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | High-side gate driver bootstrap supply | Connects 0.1µF capacitor between BST and LX to sustain high-side MOSFET drive during 97% duty cycle operation. |
| SUP | Main input supply (3.5V–36V) | Requires ≥4.7µF ceramic decoupling adjacent to pin; withstands 42V transients without damage. |
| LX | Switching node | Drives external inductor; high-impedance when disabled-prevents shoot-through during startup/shutdown. |
| PGND | Power ground return | Must connect to AGND under IC in star configuration; carries high di/dt switching current-separate from analog ground path. |
| AGND | Analog reference ground | Reference for FB/RESET/MODE; tied to PGND only at output capacitor return-minimizes noise coupling into error amplifier. |
| RESET | Open-drain power-good monitor | Asserts low when VOUT falls below 90% of 3.3V; requires external pullup-directly interfaces with MCU reset pin. |
| MODE | Operation mode select | Ground or open = skip mode (1.1µA IQ); connect to BIAS = forced-PWM (constant 2.1MHz)-no external logic needed. |
| BIAS | Internal 5V LDO output | Supplies internal circuitry; 1µF ceramic cap required to AGND; not for external loading-ensures stable core bias under all conditions. |
| OUT/FB | Output voltage sense / feedback | Fixed 3.3V version: connects directly to output; bypassed with ≥22µF X7R ceramic-sets regulation point without resistor divider. |
| EN | Enable input | Logic-compatible with 3.5V–36V supply; drives low to disable-supports direct connection to KL30 or CAN transceiver INH pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | RDS(ON) = 2.2Ω (HS) / 1.2Ω (LS) at 5V BIAS-eliminates external power switches and reduces BOM count by 4+ components. |
| Load-line output voltage positioning | VOUT shifts +0.5% at no load, −0.5% at full load-reduces required output capacitance by up to 40% versus flat-regulation designs. |
| Ultra-low quiescent current | 1.1µA in skip mode (fixed-output versions only)-enables >10-year battery life in always-on vehicle modules with <100µA total system IQ. |
| Automotive-grade protection suite | Short-circuit recovery (15-cycle limit + 13.4ms retry), thermal shutdown (+175°C), and UVLO (3.2V rising)-ensures robust field operation without external supervision. |
| 2.1MHz fixed-frequency PWM | Enables 10µH inductor and 22µF ceramic output cap-cuts solution size by >50% vs. 500kHz converters while meeting CISPR-25 Class 5 EMI limits. |
Applications
| Automotive Body Control Module (BCM) | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powers microcontroller, LIN transceiver, and door lock actuators in centralized BCM with 12V battery input subject to cold-crank dips. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator delivering regulated rail with fast transient response and cold-crank dropout support. Use Value: Maintains 3.3V output down to 3.5V input (97% duty cycle), enabling uninterrupted MCU operation during engine cranking. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view camera module mounted near bumper. IC Role / Device Role / Timing Role: Compact, low-noise 3.3V source with minimal EMI impact on analog video signals and high-speed MIPI links. Use Value: 2.1MHz switching avoids AM band interference; 1.1µA IQ extends battery backup runtime during vehicle sleep mode. |
| Infotainment System USB Hub | Electric Power Steering (EPS) Sensor Bias |
Use Scenario: Provides clean 3.3V rail to USB 2.0 hub controller and level shifters in head unit with shared 5V/3.3V domain. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main 5V buck-rejects noise from USB data switching and display drivers. Use Value: Integrated high-side current sensing and current-mode control deliver <50mV load transient undershoot at 300mA step. |
Use Scenario: Powers torque and position sensors in EPS motor control unit exposed to under-hood temperatures up to +125°C. IC Role / Device Role / Timing Role: AEC-Q100 qualified 3.3V bias supply with guaranteed operation across full automotive temp range and vibration. Use Value: Thermal shutdown +175°C and -40°C to +125°C rating ensure reliability in sealed, convection-cooled EPS enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, 3.3V fixed, 3A output, 17µA IQ, 2.25MHz, no AEC-Q100 rating | Higher current capability but lacks automotive qualification and cold-crank support below 3.0V | Select only for non-automotive industrial or consumer applications requiring >300mA. |
| LMQ66430QRNXTQ1 | 3.0V–36V input, 3.3V adjustable, 3A output, 28µA IQ, 2.1MHz, AEC-Q100 Grade 1 | Higher current and wider VIN, but larger 16-pin QFN package and higher minimum load requirement (1mA) | Prefer when system needs >300mA or dual-rail flexibility; avoid if space-constrained or ultra-low-IQ (<2µA) is mandatory. |
Compared with TPS62130ARGTR and LMQ66430QRNXTQ1, the MAX16956AUBB+ uniquely combines AEC-Q100 qualification, 1.1µA skip-mode IQ, 3.5V cold-crank support, and 3mm×3mm footprint-making it the only fit for space- and power-constrained automotive body electronics where reliability and size are non-negotiable.
Availability
MAX16956AUBB+ is available at Aetrix Electronics and suitable for automotive body ECUs, ADAS camera modules, infotainment USB hubs, and electric power steering sensor biasing requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16956AUBB+ 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 signal chain solutions.
The MAX16956AUBB+ belongs to Analog Devices' automotive-qualified power management portfolio, designed specifically for robust, low-power DC-DC conversion in body electronics, ADAS, and infotainment systems operating under harsh electrical and thermal conditions.
FAQ
What is the maximum input voltage the MAX16956AUBB+ can withstand without damage?
The MAX16956AUBB+ has an absolute maximum input voltage rating of +42V on the SUP pin, making it fully compatible with automotive load-dump transients defined in ISO 7637-2 Pulse 5a. This 42V tolerance is sustained indefinitely-no derating or external clamping is required for standard 12V/24V vehicle architectures. Operation remains functional from 3.5V to 36V, with 42V reserved strictly for fault survival.
Does the MAX16956AUBB+ require external compensation components?
No, the MAX16956AUBB+ does not require external compensation components. Its current-mode control architecture integrates slope compensation, transconductance error amplification, and internal current sensing-eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces bill-of-materials cost, and improves layout robustness compared to voltage-mode controllers.
How does the RESET output of the MAX16956AUBB+ behave during power-up and brownout?
The MAX16956AUBB+ RESET output is open-drain and asserts low when VOUT drops below 90% of nominal (2.97V for 3.3V output) and releases high-impedance when VOUT rises above 92% (3.04V). During startup, RESET remains low until the internal 5.4ms soft-start completes and VOUT crosses 3.04V. During brownout, RESET pulls low within 12µs-providing precise, fast-reset signaling to downstream MCUs without external supervision.
Can the MAX16956AUBB+ operate in forced-PWM mode, and how is it enabled?
Yes, the MAX16956AUBB+ supports forced-PWM mode for constant-frequency operation and predictable EMI profile. To enable it, connect the MODE pin to the BIAS pin (5V internal LDO). In forced-PWM mode, the device maintains 2.1MHz switching regardless of load-ideal for noise-sensitive applications like camera modules or audio subsystems where variable-frequency skip mode could interfere with signal integrity.
Is the MAX16956AUBB+ pin-compatible with other variants in the MAX16956 family?
Yes, all MAX16956 variants-including MAX16956AUBA+, MAX16956AUBB+, MAX16956AUBC+, and spread-spectrum versions-share identical 10-pin µMAX package (U10E+3), pinout, and footprint. This allows drop-in replacement across fixed 5V/3.3V, adjustable, and EMI-optimized versions without PCB redesign-simplifying qualification, inventory management, and last-time-buy risk mitigation.
MAX16956AUBB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX16956AUBB+ FAQ
1.How can I place an order for MAX16956AUBB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16956AUBB+ 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 MAX16956AUBB+ reliable?
The price and inventory of MAX16956AUBB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16956AUBB+ is usually 5 days.
3.What payment methods are accepted for MAX16956AUBB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16956AUBB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16956AUBB+?
MAX16956AUBB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16956AUBB+ 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 MAX16956AUBB+?
For technical support, including MAX16956AUBB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16956AUBB+ requirements.
6.How does Aetrix verify that MAX16956AUBB+ is sourced from the original manufacturer or authorized distributors?
All MAX16956AUBB+ 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 MAX16956AUBB+ meets industry standards.
7.What is the process for return or replacement of MAX16956AUBB+?
All MAX16956AUBB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16956AUBB+, 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 MAX16956AUBB+ part is unused and in its original packaging.
Return procedure for MAX16956AUBB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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