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Analog Devices Inc./Maxim Integrated MAX17631CATE+T
- Part No.:
- MAX17631CATE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17631CATE+T.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:720
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Product details
Overview
MAX17631CATE+T from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 1.5A output current across a 4.5V–36V input range. It features adjustable output voltage (0.9V to 90% of VIN), peak-current-mode control, and operates in PWM/DCM/PFM modes for optimized efficiency across load conditions. It is used in industrial point-of-load regulation where wide-input, compact, and thermally robust power conversion is required.
For engineers reviewing the MAX17631CATE+T datasheet, MAX17631CATE+T pinout, MAX17631CATE+T application, or MAX17631CATE+T equivalent, this page provides verified technical context, package mapping, real-world operating characteristics, and validated alternative options for design-in and supply chain continuity.
Technical Context
The MAX17631CATE+T implements peak-current-mode control with internal compensation, eliminating external loop components across its full output-voltage range. Its programmable switching frequency (400kHz–2.2MHz) supports EMI optimization and layout flexibility via RT resistor or external clock synchronization on MODE/SYNC.
It integrates high-side (137mΩ typ.) and low-side (90mΩ typ.) nMOSFETs, supports prebiased soft-start, hiccup-mode overload protection, and includes built-in RESET monitoring with 90.5–94.6% FB undervoltage assertion threshold. Thermal shutdown activates at +165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial input rails including 12V, 24V, and 36V systems without external pre-regulation. |
| Output Current | Up to 1.5A continuous - sufficient for powering FPGAs, microcontrollers, and analog signal chains in embedded systems. |
| Output Voltage Range | Adjustable from 0.9V to 90% of VIN - enables precise regulation for core voltages (e.g., 1.2V, 1.8V, 3.3V, 5V) using external resistive divider. |
| Feedback Accuracy | ±1.2% over –40°C to +125°C - ensures stable output under industrial temperature extremes without calibration. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT or external sync) - allows trade-off between size (higher fSW → smaller inductor/capacitor) and efficiency/noise. |
| Peak Efficiency | 95% - minimizes thermal stress and improves system-level power density in space-constrained applications. |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
Pinout & Package
The MAX17631CATE+T is housed in a 16-pin, 3mm × 3mm TQFN package (package code T1633+5C) with exposed pad (EP) for enhanced thermal dissipation. The EP must be soldered to SGND with multiple thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input UVLO Threshold Input | Configurable turn-on threshold (1.19–1.26V rising); pull low to disable or connect to resistor divider for input undervoltage lockout. |
| 2 VCC | Internal 5V LDO Output | Supplies internal circuitry; bypass with 2.2μF ceramic capacitor to SGND; not intended for external loading. |
| 3 SGND | Analog Ground Reference | Separate ground for feedback, soft-start, and mode logic; must be star-connected to PGND at single point to minimize noise coupling. |
| 4 MODE/SYNC | Operating Mode Selection / 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 | Connect external capacitor to SGND to set monotonic startup time; supports prebiased output startup. |
| 6 FB | Feedback Voltage Sense Input | High-impedance input (±50nA bias) for resistor-divider monitoring; regulates output to 0.9V reference (±1.2%). |
| 7 RT | Switching Frequency Programming | Connect resistor to SGND to set fSW from 400kHz to 2.2MHz; open = default 400kHz. |
| 8 RESET | Open-Drain Power-Good Output | Asserts low when FB falls below 92% of target; deasserts after 1024 cycles once FB rises above 95%. |
| 9 EXTVCC | Auxiliary Supply Input | Connect to regulated 5V output to reduce LDO losses and improve efficiency; tie to SGND if unused. |
| 10 BST | Bootstrap Capacitor Terminal | Connect 0.1μF ceramic capacitor between BST and LX to drive high-side MOSFET gate. |
| 11–12 LX | Power Switch Node | Connects to inductor switch node; carries high di/dt; requires short, low-inductance routing to minimize ringing. |
| 13–14 PGND | Power Ground Terminals | Low-impedance return path for high-current switching; must be connected to large copper pour with minimal trace length. |
| 15–16 VIN | Main Power Input | Accepts 4.5V–36V; decouple each VIN pin to adjacent PGND with 2.2μF X7R ceramic capacitor placed near pins. |
| EP | Exposed Thermal Pad | Must be soldered to SGND plane with ≥6 thermal vias (0.3mm diameter) for θJA = 38°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High- and Low-Side MOSFETs | Reduces BOM count and PCB area; eliminates need for external Schottky catch diode and gate drivers. |
| Internal Compensation | Enables stable operation across full 0.9V–VIN×0.9 output range without external compensation network. |
| Programmable Operating Modes | PWM (forced), DCM (light-load), or PFM (pulse-skipping) - selectable per application efficiency vs. noise requirements. |
| Robust Protection Suite | Hiccup-mode OCP, thermal shutdown (+165°C), RESET monitoring, and adjustable EN/UVLO prevent fault propagation in harsh environments. |
| Wide Temperature Range | Specified for –40°C to +125°C ambient (–40°C to +150°C junction), enabling use in industrial and automotive under-hood applications. |
| EMI-Optimized Design | External clock synchronization and adjustable frequency allow alignment with quiet bands; meets CISPR-22 Class B conducted/radiated limits. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus transceivers in factory automation cabinets with 24V rail. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V input to 3.3V/5V for digital logic and analog front-ends. Use Value: ±1.2% output accuracy and hiccup-mode protection ensure reliable operation during brownouts and short-circuit events. |
Use Scenario: Local regulation for FPGA core voltage (1.2V) and auxiliary rails (1.8V, 3.3V) on high-density compute boards. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter supporting multiple voltage domains from shared 12V or 24V backplane. Use Value: Internal compensation and 2.2MHz max switching frequency enable compact 2-layer board designs with small 1.5µH inductors. |
| Distributed Supply Regulation | Base Station Power Supplies |
|
Use Scenario: Secondary regulation in telecom remote radio units (RRUs) where 48V intermediate bus is stepped down to 5V/3.3V for RF ICs and DACs. IC Role / Device Role / Timing Role: Efficient, thermally robust point-of-load converter operating in forced PWM mode to suppress subharmonic noise in sensitive RF sections. Use Value: EXTVCC support reduces power loss by >15% at 1.5A, lowering junction temperature in sealed enclosures. |
Use Scenario: Powering fronthaul interface ASICs and clock buffers in 5G macro base stations with 28V or 36V input. IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering clean, well-regulated 1.2V/1.8V supplies with low output ripple (<20mVpp). Use Value: 95% peak efficiency and 38°C/W thermal resistance maintain <85°C junction temp at full load in convection-cooled chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A output, fixed-frequency COT control; no internal compensation; requires external loop components. | Better suited for ultra-wide-input automotive applications but lacks integrated compensation and RESET function. | Select LM5164QPWPRQ1 only when input exceeds 36V or AEC-Q100 qualification is mandatory; MAX17631CATE+T offers simpler design-in for industrial 24V/36V systems. |
| TPS54332DR | 3.5V–28V input, 3A output, fixed 500kHz frequency, no PFM/DCM modes; requires external compensation. | Higher current capability but narrower input range and no light-load efficiency optimization modes. | Choose TPS54332DR for cost-sensitive 3A applications with 12V/24V inputs and no requirement for adaptive light-load operation or RESET monitoring. |
Compared with LM5164QPWPRQ1 and TPS54332DR, the MAX17631CATE+T uniquely combines 36V max input, 1.5A output, internal compensation, multi-mode efficiency optimization, and integrated RESET-enabling faster design cycle and higher reliability in industrial point-of-load systems.
Availability
MAX17631CATE+T 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 RoHS-compliant packaging.
Supply support for MAX17631CATE+T 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, communications, and computing applications.
The MAX17631 product line delivers high-voltage, high-efficiency synchronous buck converters targeting space-constrained industrial power systems requiring wide input range, robust protection, and simplified layout.
FAQ
What is the output voltage adjustment range for the MAX17631CATE+T?
The MAX17631CATE+T supports an adjustable output voltage from 0.9V up to 90% of the input voltage (VIN). This is achieved using an external resistor divider connected to the FB pin, referenced to the internal 0.9V feedback threshold. The ±1.2% regulation accuracy over –40°C to +125°C ensures stable output across industrial temperature extremes.
Does the MAX17631CATE+T require external compensation components?
No, the MAX17631CATE+T features built-in compensation across its entire output-voltage range. This eliminates the need for external Type-II or Type-III compensation networks, simplifying design, reducing BOM count, and improving layout robustness-especially critical for adjustable-output configurations.
How does the MODE/SYNC pin configure operating modes on the MAX17631CATE+T?
The MODE/SYNC pin selects between three operating modes: open circuit enables PFM (pulse-frequency modulation) for highest light-load efficiency; connection to SGND forces constant-frequency PWM; connection to VCC enables discontinuous-conduction mode (DCM). It also accepts external clock signals (1.1–1.4× fSW) for EMI reduction.
What thermal performance can be expected from the MAX17631CATE+T in a standard PCB layout?
In a four-layer board with proper thermal vias to SGND, the MAX17631CATE+T achieves θJA = 38°C/W and θJC = 10°C/W. With 1.5A load at 24V input and 5V output, typical junction temperature rise is ~57°C above ambient-well within the +150°C maximum rating when ambient stays ≤ +85°C.
Can the MAX17631CATE+T be synchronized to an external clock source?
Yes, the MAX17631CATE+T supports external clock synchronization via the MODE/SYNC pin. It accepts input frequencies from 1.1× to 1.4× the internally programmed switching frequency (e.g., 440kHz for a 400kHz base), enabling precise timing alignment to avoid beat frequencies and meet stringent EMI requirements in dense PCB layouts.
MAX17631CATE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
MAX17631CATE+T FAQ
1.How can I place an order for MAX17631CATE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17631CATE+T 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 MAX17631CATE+T reliable?
The price and inventory of MAX17631CATE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17631CATE+T is usually 5 days.
3.What payment methods are accepted for MAX17631CATE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17631CATE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17631CATE+T?
MAX17631CATE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17631CATE+T 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 MAX17631CATE+T?
For technical support, including MAX17631CATE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17631CATE+T requirements.
6.How does Aetrix verify that MAX17631CATE+T is sourced from the original manufacturer or authorized distributors?
All MAX17631CATE+T 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 MAX17631CATE+T meets industry standards.
7.What is the process for return or replacement of MAX17631CATE+T?
All MAX17631CATE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17631CATE+T, 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 MAX17631CATE+T part is unused and in its original packaging.
Return procedure for MAX17631CATE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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