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Analog Devices Inc./Maxim Integrated MAX17631BATE+
- Part No.:
- MAX17631BATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17631BATE+.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:215
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Product details
Overview
MAX17631BATE+ from Maxim Integrated is a fixed 5V, 1.5A synchronous step-down DC-DC converter with integrated high- and low-side MOSFETs, operating from 4.5V to 36V input. It features peak-current-mode control, ±1.2% output voltage regulation over –40°C to +125°C, and supports PWM/DCM/PFM operation modes for high efficiency across load range. Used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17631BATE+ datasheet, MAX17631BATE+ pinout, MAX17631BATE+ application, or MAX17631BATE+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support details - all specific to the MAX17631B variant in 16-pin TQFN (3mm × 3mm) package.
Technical Context
The MAX17631BATE+ implements peak-current-mode control with internal compensation, eliminating external loop components. Its MODE/SYNC pin selects forced PWM, DCM, or PFM operation - enabling >95% peak efficiency and enhanced light-load performance via valley current limiting and hiccup-mode overload protection.
It integrates 137mΩ high-side and 90mΩ low-side nMOSFETs, supports 400kHz–2.2MHz switching frequency (via RT resistor or external clock sync), and includes programmable EN/UVLO (1.215V threshold), soft-start (SS pin), and open-drain RESET with 92–95% FB monitoring window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% over –40°C to +125°C - ensures stable rail for microcontrollers and FPGAs without external feedback resistors. |
| Input Voltage Range | 4.5V to 36V - supports wide industrial input sources including 12V/24V/36V rails and unregulated wall adapters. |
| Max Output Current | 1.5A continuous - sufficient for powering SoCs, sensors, and interface ICs in compact point-of-load designs. |
| Switching Frequency | 400kHz (default) to 2.2MHz - enables small magnetics and ceramic capacitors; adjustable via RT pin or external clock sync. |
| Efficiency Peak | 95% at full load - achieved via synchronous rectification and low RDS(on) MOSFETs (137mΩ/90mΩ), reducing conduction loss. |
| Quiescent Current | 50μA in PFM mode - extends battery life in always-on industrial monitoring nodes. |
| Shutdown Current | 2.8μA - minimizes system standby power draw during deep sleep or fault conditions. |
Pinout & Package
Package: 16-pin TQFN (3mm × 3mm), exposed pad (EP) thermally connected to SGND. RoHS-compliant, moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input UVLO Threshold Input | Active-high enable; internal 1.215V threshold allows resistor-divider programming for precise turn-on voltage (e.g., 6.5V min VIN). |
| 2 VCC | Internal 5V LDO Output | Supplies internal circuitry; bypassed with 2.2μF ceramic capacitor - not for external loading. |
| 3 SGND | Analog Ground Reference | Low-noise reference for FB, SS, MODE/SYNC; must be separated from PGND in layout to avoid noise coupling. |
| 4 MODE/SYNC | Operating Mode Control / Clock Sync Input | Open = PFM; SGND = forced PWM; VCC = DCM; also accepts external clock (1.1–1.4× fSW) for EMI reduction. |
| 5 SS | Soft-Start Timing Input | Connects to SGND via capacitor (e.g., 5600pF) to control ramp rate and prevent inrush current during startup. |
| 6 FB | Feedback Input (Fixed 5V) | Direct connection to VOUT - no external divider needed; monitors output for ±1.2% regulation and RESET assertion. |
| 7 RT | Switching Frequency Programming | Resistor-to-SGND sets fSW: 50.8kΩ = 400kHz; open = default 400kHz; supports synchronization up to 2.2MHz. |
| 8 RESET | Open-Drain Power-Good Output | Asserts low when FB falls below 92% of 5V (4.6V); deasserts after 1024 cycles once FB rises above 95% (4.75V). |
| 9 EXTVCC | Auxiliary Supply Input | Connect to 5V VOUT to reduce LDO losses and improve efficiency; leave unconnected or tie to SGND if unused. |
| 10 BST | Bootstrap Capacitor Terminal | Requires 0.1μF ceramic cap to LX - enables high-side gate drive; critical for reliable MOSFET switching. |
| 11–12 LX | Power Switching Node | Connects directly to inductor switch node; handles high di/dt - requires short, low-inductance PCB routing. |
| 13–14 PGND | Power Ground Return | High-current return path for MOSFETs and inductor; must connect to large copper pour with multiple thermal vias to EP. |
| 15–16 VIN | Main Power Input | 4.5V–36V input; decoupled with 2.2μF ceramic cap placed adjacent to pins to suppress high-frequency ripple. |
| EP | Exposed Thermal Pad | Mandatory connection to SGND plane with ≥6 thermal vias - essential for thermal performance (θJA = 38°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated 137mΩ/90mΩ nMOSFETs eliminate external Schottky diode - reduces BOM count and improves efficiency by ~5% vs. asynchronous designs. |
| Internal Compensation | No external Type-II/III compensation network required - simplifies layout and accelerates design-in for fixed-output variants like MAX17631B. |
| Multi-Mode Operation | PWM (forced), DCM, and PFM selectable via MODE/SYNC - maintains >85% efficiency down to 1mA load without external control logic. |
| Robust Protection Suite | Hiccup-mode OCP, thermal shutdown (165°C), RESET with 92–95% FB window, and monotonic startup with prebias support - ensures reliability in harsh industrial environments. |
| EMI-Optimized Design | External clock sync capability and controlled slew-rate switching - demonstrated CISPR-22 Class B compliance on EVKITB with minimal filtering. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and fieldbus transceivers from 24V DC rails with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 1.5A with hiccup-mode OCP and -40°C to +125°C operation. Use Value: Eliminates need for external compensation and Schottky diode, reducing solution size by 30% vs. discrete controllers while meeting industrial EMC standards. |
Use Scenario: Generating clean 5V rail for FPGA configuration, MCU peripherals, and ADC references on dense PCBs. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with soft-start and RESET signaling for sequenced power-up. Use Value: ±1.2% output accuracy and 1024-cycle RESET delay ensure reliable boot timing for sensitive digital loads under line/load transients. |
| Distributed Supply Regulation | Base Station Power Supplies |
Use Scenario: Local regulation on remote sensor nodes powered via PoE or long cable runs with significant IR drop. IC Role / Device Role / Timing Role: High-input-voltage (up to 36V) buck converter supporting wide VIN tolerance and prebias startup. Use Value: 4.5V minimum VIN and monotonic soft-start with prebias capability prevent brownout during hot-plug events in distributed architectures. |
Use Scenario: Intermediate 5V rail generation in 4G/5G small cell baseband units where space, efficiency, and thermal management are critical. IC Role / Device Role / Timing Role: Compact, high-efficiency 1.5A buck stage feeding downstream POL converters and RF front-end bias supplies. Use Value: 95% peak efficiency and 38°C/W θJA enable operation at 70°C ambient without heatsinks - reducing system cooling cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A max, adjustable output only; requires external compensation; no integrated EXTVCC switchover. | Automotive AEC-Q100 qualified; wider VIN but lower current and no fixed 5V option - necessitates feedback resistor network. | Select when automotive qualification or >36V input is mandatory; accept added BOM and layout complexity for extended voltage range. |
| TPS54560DGQR | 3.5V–60V input, 5A max, adjustable output only; external compensation; no PFM/DCM light-load modes - higher quiescent current (146μA). | Higher current capability and broader VIN, but lacks fixed 5V option and advanced light-load efficiency modes. | Choose for higher output current needs (>1.5A) or when 60V max input is required; trade off light-load efficiency and design simplicity. |
Compared with LM5164QPWPRQ1 and TPS54560DGQR, the MAX17631BATE+ provides a ready-to-use 5V solution with zero external feedback components, superior light-load efficiency via PFM/DCM, and optimized thermal performance in a smaller 3mm × 3mm footprint - ideal for space-constrained industrial and telecom applications where fixed 5V is standard.
Availability
MAX17631BATE+ is available at Aetrix Electronics and suitable for industrial control power supplies, general-purpose point-of-load regulation, and distributed supply regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17631BATE+ 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 industrial, automotive, and communications markets.
The MAX17631 product line delivers high-voltage, high-efficiency synchronous buck regulators targeting space-constrained industrial and telecom power systems needing robust operation from –40°C to +125°C ambient.
FAQ
What is the output voltage accuracy of the MAX17631BATE+ over temperature?
The MAX17631BATE+ maintains ±1.2% output voltage regulation over the full –40°C to +125°C junction temperature range. This specification applies specifically to the fixed 5V variant (MAX17631B) and is guaranteed by design and characterization - not just typical data. The MAX17631BATE+ achieves this without external trimming or calibration, making it suitable for precision 5V rails in industrial environments where thermal drift must be minimized.
Can the MAX17631BATE+ operate with an input voltage lower than 4.5V?
No, the MAX17631BATE+ has a specified minimum input voltage of 4.5V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4.5V may result in failure to start, unstable regulation, or undefined behavior. The device's internal LDO (VCC) requires sufficient headroom to maintain 5V output, and the MOSFET gate drive circuitry is designed for reliable operation only within the 4.5V–36V range. For sub-4.5V applications, consider alternative regulators such as the MAX17503 or MAX2000x families.
Does the MAX17631BATE+ require an external bootstrap capacitor?
Yes, the MAX17631BATE+ requires a 0.1μF ceramic capacitor between BST and LX pins. This bootstrap capacitor is essential for charging the high-side MOSFET gate driver and ensuring proper switching operation. The datasheet specifies X7R or better dielectric, 0603 or 0805 case size, and placement adjacent to the BST/LX pins to minimize parasitic inductance. Omitting or undersizing this capacitor causes erratic switching, increased RDS(on), and potential thermal failure.
How does the RESET function work on the MAX17631BATE+?
The MAX17631BATE+ provides an open-drain RESET output that asserts low when the FB voltage falls below 92% of its nominal 5V setpoint (i.e., <4.6V). It remains asserted until FB rises above 95% (≥4.75V) and holds high for 1024 switching cycles before confirming valid regulation. This hysteresis and delay prevent false resets during transient dips. The RESET pin drives microcontroller reset inputs directly and requires an external pull-up resistor (typically 10kΩ to 3.3V or 5V).
Is the MAX17631BATE+ pin-compatible with other MAX17631 variants like MAX17631AATE+ or MAX17631CATE+?
Yes, the MAX17631BATE+, MAX17631AATE+, and MAX17631CATE+ share identical 16-pin TQFN (3mm × 3mm) packages and pinouts - including EN/UVLO, FB, MODE/SYNC, and RESET. However, their internal feedback networks differ: MAX17631A is fixed 3.3V, MAX17631B is fixed 5V, and MAX17631C is adjustable. Swapping variants requires verifying output voltage compatibility and adjusting external components (e.g., EXTVCC connection for MAX17631B/C, FB network for MAX17631C).
MAX17631BATE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 32.4V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX17631BATE+ FAQ
1.How can I place an order for MAX17631BATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17631BATE+ 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 MAX17631BATE+ reliable?
The price and inventory of MAX17631BATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17631BATE+ is usually 5 days.
3.What payment methods are accepted for MAX17631BATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17631BATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17631BATE+?
MAX17631BATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17631BATE+ 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 MAX17631BATE+?
For technical support, including MAX17631BATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17631BATE+ requirements.
6.How does Aetrix verify that MAX17631BATE+ is sourced from the original manufacturer or authorized distributors?
All MAX17631BATE+ 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 MAX17631BATE+ meets industry standards.
7.What is the process for return or replacement of MAX17631BATE+?
All MAX17631BATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17631BATE+, 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 MAX17631BATE+ part is unused and in its original packaging.
Return procedure for MAX17631BATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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