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Analog Devices Inc./Maxim Integrated MAX17633CATP+T
- Part No.:
- MAX17633CATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17633CATP+T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,388
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Product details
Overview
MAX17633CATP+T from Maxim Integrated is a Himalaya-series synchronous step-down DC-DC converter IC with integrated high-side and low-side MOSFETs, delivering up to 3.5A output current across a 4.5V–36V input range. It features adjustable output voltage (0.9V to 90% of VIN), ±1.3% FB regulation accuracy over –40°C to +125°C, peak-current-mode control, and operates in PWM/DCM/PFM modes. It serves as a primary point-of-load regulator in industrial control power supplies.
For engineers reviewing the MAX17633CATP+T datasheet, MAX17633CATP+T pinout, MAX17633CATP+T application, or MAX17633CATP+T equivalent, key selection considerations include its 20-pin TQFN package, 400kHz–2.2MHz programmable switching frequency, EXTVCC auxiliary supply for efficiency optimization, hiccup-mode overload protection, and built-in compensation eliminating external loop components.
Technical Context
The MAX17633CATP+T implements peak-current-mode control with internal transconductance error amplifier, slope compensation, and cycle-by-cycle current limiting. Its MODE/SYNC pin selects between constant-frequency PWM, pulse-skipping PFM, or discontinuous-conduction DCM operation - each altering inductor current behavior and light-load efficiency.
It integrates dual nMOS power switches (RDS(ON)H = 65–125mΩ, RDS(ON)L = 40–80mΩ), a 5V INTVCC LDO, and a dedicated EXTVCC input that reduces internal LDO losses when connected to a ≥5V output rail. The device supports external clock synchronization within ±40% of its RT-set frequency and includes monotonic soft-start via SS pin capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - enables direct regulation from 12V/24V industrial rails or wide-range wall adapters without pre-regulation. |
| Output Current | Up to 3.5A continuous - sufficient for FPGA core logic, microcontroller subsystems, or multi-rail PMIC front-ends. |
| Output Voltage | Adjustable from 0.9V to 90% of VIN - supports custom logic I/O, DDR termination, or analog subsystems with precise voltage setting. |
| FB Regulation Accuracy | ±1.3% over –40°C to +125°C - ensures stable output under full industrial temperature range without calibration. |
| Switching Frequency | 400kHz to 2.2MHz (RT-programmable) - allows optimization of size (higher fSW) vs. efficiency (lower fSW) and EMI filtering requirements. |
| Efficiency Peak | >93% at full load - minimizes thermal stress and enables compact layout with all-ceramic capacitors and small inductors. |
| Shutdown Current | 2.8μA - supports ultra-low-power standby states in battery-backed or energy-harvesting systems. |
Pinout & Package
MAX17633CATP+T is housed in a thermally enhanced 20-pin, 4mm × 4mm TQFN package with exposed pad (EP), optimized for high-power density and thermal dissipation (θJA = 26°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 PGND | Power Ground | Low-impedance return path for high-current LX switching; must connect directly to power ground plane with multiple vias. |
| 2, 3, 14 IN | Main Input Supply | Accepts 4.5V–36V; requires ≥2.2μF ceramic decoupling placed adjacent to pins to suppress high di/dt noise. |
| 4 EN/UVLO | Enable & Input UVLO | Configurable turn-on threshold (1.19–1.26V rising); enables power sequencing or brownout protection via resistor divider. |
| 5 RESET | Open-Drain Fault Flag | Asserts low if FB falls below 92% of target; deasserts after 1024 cycles once FB rises above 95% - provides reliable POR and fault monitoring. |
| 9 FB | Feedback Input | Connects to center of external resistor divider for adjustable output; internal reference is 0.9V (±1.3%) - sets output as VOUT = 0.9V × (1 + R1/R2). |
| 10 RT | Frequency Programming | Resistor-to-SGND sets fSW from 400kHz to 2.2MHz; open circuit defaults to ~500kHz - enables EMI spread-spectrum tuning and inductor size reduction. |
| 11 MODE/SYNC | Control Mode Selection | Selects PWM (SGND), PFM (open), or DCM (INTVCC); also accepts external clock (1.1–1.4× fSW) for system-level synchronization. |
| 17–19 LX | Switch Node | High-current connection to inductor; three parallel pins reduce trace inductance and improve thermal handling during 3.5A switching transitions. |
| 20 BST | Bootstrap Capacitor Terminal | Requires 0.1μF ceramic cap to LX; sustains gate drive for high-side MOSFET during 100% duty cycle - critical for low-VIN operation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated 65mΩ/40mΩ high-side/low-side nMOS eliminates external Schottky diode - reduces conduction loss and improves full-load efficiency. |
| Built-in Compensation | Internal Type-II compensation network eliminates need for external RC networks - simplifies design, reduces BOM count, and guarantees stability across entire output voltage range. |
| EXTVCC Auxiliary Supply | Accepts external 5V rail to power internal gate drivers - cuts INTVCC LDO losses by >50%, improving light-load and full-load efficiency simultaneously. |
| Hiccup-Mode Overload Protection | Enters current-limited restart cycle upon sustained overcurrent - prevents thermal runaway while maintaining system visibility via RESET assertion. |
| CISPR-22 Class B Compliance | Validated radiated emissions meet Class B limits without added shielding or ferrites - accelerates EMC certification for industrial and telecom equipment. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, motor driver logic, and sensor interface circuitry in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24V to 3.3V/5V for microcontrollers, ADCs, and digital isolators. Use Value: Wide 4.5V–36V input handles bus transients; ±1.3% regulation ensures accurate ADC reference and stable MCU operation across temperature. | Use Scenario: Local voltage conversion on dense PCBs for FPGA core, memory, or high-speed SerDes rails requiring clean, tightly regulated supplies. IC Role / Device Role / Timing Role: Adjustable-output buck converter delivering 0.9V–3.3V at up to 3.5A with minimal external components. Use Value: Programmable frequency and internal compensation enable compact, high-density layouts with fast transient response (<100µs recovery from 0→1.75A step). |
| Distributed Supply Regulation | Base-Station Power Supplies |
Use Scenario: Secondary regulation stage in distributed power architecture (DPA), stepping down intermediate 12V bus to processor-specific voltages. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter operating in forced PWM mode for predictable EMI profile. Use Value: 20-pin TQFN with EP enables >2.4W dissipation at 70°C ambient; EXTVCC support improves efficiency at 12V input by reducing LDO overhead. | Use Scenario: Powering remote radio unit (RRU) digital baseband and RF front-end subsystems in 4G/5G infrastructure with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: High-voltage input buck regulator delivering 5V/3.3V from -48V-derived 24V or 36V intermediate bus. Use Value: -40°C to +125°C operating range and hiccup-mode protection ensure uninterrupted operation in outdoor enclosures; CISPR-22 Class B compliance simplifies site-level EMC testing. |
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, 1.5A output, no integrated low-side FET (external diode or FET required), no EXTVCC, lower max current. | Targeted at automotive 48V systems; lacks internal compensation and hiccup-mode protection. | Choose LM5164QPWPRQ1 only if input exceeds 36V or AEC-Q100 qualification is mandatory; MAX17633CATP+T offers higher current, better integration, and industrial-grade features. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, external compensation, no EXTVCC, no PFM/DCM light-load modes, larger SOIC-8 package. | Designed for cost-sensitive automotive applications; requires more external components and has higher quiescent current (146μA vs. 96μA in PFM). | Choose TPS54560BQDDARQ1 only if 5A output is required and layout space permits larger package; MAX17633CATP+T delivers superior light-load efficiency, smaller footprint, and simpler design. |
Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, MAX17633CATP+T provides higher integration (dual MOSFETs + compensation), superior light-load efficiency via PFM/DCM, and a compact 4mm × 4mm TQFN package - making it optimal for space-constrained industrial and telecom point-of-load designs where thermal performance and design simplicity are critical.
Availability
MAX17633CATP+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 consistent parametric performance.
Supply support for MAX17633CATP+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, automotive, communications, and computing markets.
The MAX17633 series belongs to Maxim's Himalaya power portfolio, engineered to deliver cooler, smaller, and simpler DC-DC solutions for harsh industrial environments - emphasizing high efficiency, wide input range, and robust protection features.
FAQ
What output voltage does the MAX17633CATP+T support?
The MAX17633CATP+T is the adjustable-output variant (MAX17633C) of the Himalaya family, supporting an output voltage range from 0.9V up to 90% of the input voltage (VIN). Its internal feedback reference is precisely 0.9V ±1.3% over –40°C to +125°C, enabling accurate regulation using an external resistor divider on the FB pin. This makes MAX17633CATP+T suitable for custom voltage rails such as 1.2V for processors or 2.5V for analog circuitry.
Does the MAX17633CATP+T require external compensation components?
No, the MAX17633CATP+T includes fully integrated Type-II compensation circuitry across its entire output voltage range. This eliminates the need for external resistors or capacitors in the feedback loop - reducing BOM count, PCB area, and design validation effort. The internal compensation ensures stable operation with standard ceramic output capacitors and common inductor values, as verified in Maxim's EV kit documentation for MAX17633CATP+T.
How does the MODE/SYNC pin affect MAX17633CATP+T operation?
The MODE/SYNC pin on MAX17633CATP+T configures three distinct operating modes: connecting to SGND enables constant-frequency PWM; leaving open enables pulse-skipping PFM for highest light-load efficiency; connecting to INTVCC enables DCM for reduced switching losses at light loads. Additionally, applying an external clock (1.1–1.4× RT-set frequency) synchronizes switching to avoid beat frequencies - but only in PWM or DCM mode, not PFM.
What thermal performance can be expected from the MAX17633CATP+T in a real design?
When mounted on a standard 4-layer PCB with proper thermal vias to SGND under the exposed pad (EP), the MAX17633CATP+T achieves a junction-to-ambient thermal resistance (θJA) of 26°C/W. At 70°C ambient and full 3.5A load, this allows approximately 2.4W of continuous power dissipation before derating begins. Its thermal shutdown activates at +165°C with 10°C hysteresis, ensuring safe operation even under sustained overload or poor airflow conditions.
Can the MAX17633CATP+T be used with an external 5V supply to improve efficiency?
Yes, the MAX17633CATP+T features an EXTVCC pin specifically designed to accept an external 5V supply - typically sourced from its own output or another nearby rail. When EXTVCC is active (>4.56V), the internal LDO powering the gate drivers is bypassed, reducing power loss and increasing overall efficiency by up to 3% at medium-to-heavy loads. If unused, EXTVCC must be tied to SGND per datasheet requirements.
MAX17633CATP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-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:
- 3.5A
- Frequency - Switching:
- 380kHz ~ 2.45MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX17633CATP+T FAQ
1.How can I place an order for MAX17633CATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17633CATP+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 MAX17633CATP+T reliable?
The price and inventory of MAX17633CATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17633CATP+T is usually 5 days.
3.What payment methods are accepted for MAX17633CATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17633CATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17633CATP+T?
MAX17633CATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17633CATP+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 MAX17633CATP+T?
For technical support, including MAX17633CATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17633CATP+T requirements.
6.How does Aetrix verify that MAX17633CATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17633CATP+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 MAX17633CATP+T meets industry standards.
7.What is the process for return or replacement of MAX17633CATP+T?
All MAX17633CATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17633CATP+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 MAX17633CATP+T part is unused and in its original packaging.
Return procedure for MAX17633CATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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