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Analog Devices Inc./Maxim Integrated MAX17633CATP+
- Part No.:
- MAX17633CATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17633CATP+.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,736
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Product details
Overview
The MAX17633CATP+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated 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, and peak-current-mode control architecture. It is used in industrial control power supplies and high-voltage single-board systems requiring compact, thermally robust regulation.
For engineers reviewing the MAX17633CATP+ datasheet, MAX17633CATP+ pinout, MAX17633CATP+ application, or MAX17633CATP+ equivalent, key selection considerations include its 20-pin TQFN package, programmable 400kHz–2.2MHz switching frequency, EXTVCC auxiliary supply for efficiency optimization, hiccup-mode overload protection, and built-in compensation eliminating external loop components.
Technical Context
The MAX17633CATP+ implements peak-current-mode control with internal transconductance error amplifier, slope compensation, and PWM comparator driving integrated high-side (65–125mΩ) and low-side (40–80mΩ) nMOS switches. Its MODE/SYNC pin selects between PWM (constant frequency), PFM (pulse-skipping), or DCM (discontinuous conduction) operation-enabling >93% peak efficiency and enhanced light-load performance.
It supports external clock synchronization (1.1× to 1.4× fSW), adjustable EN/UVLO threshold (1.19–1.26V rising), monotonic soft-start via SS pin, and built-in RESET assertion when FB falls below 92% of regulation. Thermal shutdown activates at +165°C with 10°C hysteresis, and it meets CISPR 22 Class B EMI requirements.
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 bus systems without pre-regulation. |
| Output Current | Up to 3.5A continuous - sufficient for powering FPGAs, DSPs, and multi-rail SoCs in embedded systems. |
| Output Voltage | Adjustable from 0.9V to 90% of VIN - enables flexible point-of-load regulation for core, I/O, and analog rails. |
| 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 (programmable via RT resistor or external sync) - allows optimization of size (higher fSW) vs. efficiency (lower fSW). |
| Peak Efficiency | >93% - reduces thermal load and enables compact PCB layout with all-ceramic capacitors. |
| Shutdown Current | 2.8μA - supports ultra-low-power standby modes in battery-backed or energy-sensitive applications. |
| Package | 20-pin TQFN (4mm × 4mm, exposed pad) - provides low thermal resistance (θJA = 26°C/W) for high-power density designs. |
Pinout & Package
Package: 20-pin TQFN (4mm × 4mm), exposed thermal pad (EP), RoHS-compliant, land pattern per Maxim document 90-0409.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 PGND | Power Ground | High-current return path for LX switching node; must connect to dedicated power ground plane with low-inductance routing. |
| 2, 3, 14 IN | Main Input Supply | Accepts 4.5V–36V; requires ≥2.2μF ceramic decoupling close to pins to suppress high-frequency ripple. |
| 4 EN/UVLO | Enable / Input UVLO Control | Configurable turn-on threshold (1.19–1.26V rising); pull high to enable, tie to IN for always-on, or use resistor divider for precise input brownout. |
| 5 RESET | Open-Drain Fault Indicator | Asserts low when FB drops below 92% of set value; deasserts after 1024 cycles once FB rises above 95% - enables system-level power-good sequencing. |
| 6 INTVCC | Internal 5V LDO Output | Supplies internal circuitry; bypass with 2.2μF ceramic to SGND; not intended for external loading. |
| 7 SGND | Analog Ground Reference | Separate low-noise reference for FB, SS, RT, MODE/SYNC; must be star-connected to PGND at single point near IC. |
| 8 SS | Soft-Start Timing Input | Connect capacitor to SGND to control ramp rate; prevents inrush current and enables monotonic startup into pre-biased outputs. |
| 9 FB | Feedback Input | For MAX17633C: connects to center of external resistor divider to set output; supports 0.9V–VIN×0.9 range with ±1.3% accuracy. |
| 10 RT | Frequency Programming | Resistor-to-SGND sets fSW from 400kHz to 2.2MHz; open for default 500kHz - enables EMI 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 synchronized multi-rail systems. |
| 12 EXTVCC | Auxiliary Supply Input | Connect to 5V output rail to reduce INTVCC LDO losses and improve full-load efficiency; tie to SGND if unused. |
| 13, 16 NC | No Connect | Not internally bonded; leave unconnected and unpopulated on PCB. |
| 17–19 LX | Switching Node | High-current connection to inductor; multiple pins reduce trace inductance and improve thermal spreading. |
| 20 BST | Bootstrap Capacitor Terminal | Requires 0.1μF ceramic capacitor to LX; enables high-side gate drive above VIN for efficient synchronous rectification. |
| EP | Exposed Thermal Pad | Mandatory connection to SGND with ≥4 thermal vias; critical for achieving θJA = 26°C/W and reliable 3.5A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated 65mΩ high-side and 40mΩ low-side nMOS switches eliminate external Schottky diode, reducing component count and conduction loss. |
| Internal Compensation | Eliminates need for external Type-II/III compensation network - simplifies design, improves stability across full output voltage range (0.9V–VIN×0.9). |
| Multi-Mode Operation | PWM (constant frequency), PFM (light-load pulse skipping), and DCM (discontinuous conduction) selectable via MODE/SYNC - balances efficiency vs. EMI across load conditions. |
| Hiccup-Mode Overload Protection | Enters current-limited restart cycle upon sustained overcurrent - protects MOSFETs and inductor during short-circuit or overload without thermal runaway. |
| Pre-Biased Soft-Start | Monotonic startup into pre-biased output voltages prevents reverse current flow - essential for hot-swap and redundant power systems. |
| CISPR 22 Class B Compliance | Meets radiated EMI limits without additional shielding or filtering - reduces system-level certification effort in industrial and telecom equipment. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and sensor interfaces in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 3.5A buck regulator converting 24V bus to 3.3V/5V logic rails with hiccup-mode fault containment. Use Value: Wide 4.5V–36V input handles bus transients; ±1.3% regulation ensures ADC reference stability; TQFN package enables dense board layout. | Use Scenario: Local regulation for FPGA core voltage (0.9V–1.2V) and auxiliary I/O banks (1.8V, 3.3V) on high-speed digital boards. IC Role / Device Role / Timing Role: Adjustable-output synchronous buck supplying configurable VCCINT/VCCAUX with programmable soft-start and RESET monitoring. Use Value: 0.9V–VIN×0.9 range covers common FPGA core voltages; 2.2MHz max fSW allows <1µH inductors; EXTVCC improves efficiency at 5V output. |
| Distributed Supply Regulation | Base-Station Power Supplies |
Use Scenario: Secondary regulation in distributed power architectures where intermediate 12V bus feeds multiple local regulators. IC Role / Device Role / Timing Role: High-efficiency 12V-to-5V/3.3V conversion with external clock sync to align switching edges across multiple rails. Use Value: MODE/SYNC pin enables deterministic phase alignment; 400kHz–2.2MHz programmability avoids beat frequencies; PFM mode extends battery life in remote nodes. | Use Scenario: Powering RF front-end ICs, transceivers, and baseband processors in 4G/5G small cells with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Compact, high-reliability buck converter delivering 3.5A at 5V or adjustable output with RESET signaling for system health monitoring. Use Value: CISPR 22 Class B compliance eliminates EMI filter cost; -40°C to +125°C rating supports outdoor enclosures; exposed pad ensures thermal margin at full load. |
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, 3.5A, adjustable output; requires external compensation; no EXTVCC or built-in RESET. | Lacks integrated RESET and EXTVCC; higher VIN range suits automotive 48V systems but adds complexity for industrial 24V use. | Choose LM5164QPWPRQ1 only if >36V input capability is required and external compensation is acceptable. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A, fixed/adjustable output; requires external compensation; no PFM/DCM modes; lower quiescent current (14.5μA). | Higher current rating but lacks multi-mode efficiency optimization; no hiccup-mode protection; larger 8-pin SO PowerPAD package. | Choose TPS54560BQDDARQ1 if 5A output and automotive AEC-Q100 qualification are mandatory, and constant PWM operation suffices. |
Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MAX17633CATP+ delivers superior integration (internal compensation, RESET, EXTVCC), tighter regulation accuracy (±1.3%), and optimized light-load efficiency via PFM/DCM-making it ideal for space-constrained industrial and telecom designs where reliability and ease of use are prioritized over ultra-high VIN or AEC-Q100 compliance.
Availability
MAX17633CATP+ 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+ 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 MAX17633 series belongs to Maxim's Himalaya power portfolio, engineered to deliver cooler, smaller, and simpler DC-DC solutions for demanding industrial environments with wide input ranges and high reliability requirements.
FAQ
What output voltage range does the MAX17633CATP+ support?
The MAX17633CATP+ 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. The device maintains ±1.3% feedback regulation accuracy across the full industrial temperature range (–40°C to +125°C), making it suitable for dynamically configured power rails in FPGA and processor applications. Unlike fixed-output variants (MAX17633A/B), the MAX17633CATP+ offers maximum flexibility for diverse system voltage requirements.
How does the MODE/SYNC pin affect MAX17633CATP+ operation?
The MODE/SYNC pin on the MAX17633CATP+ determines control mode and enables external clock synchronization. When tied to SGND, it forces constant-frequency PWM operation; left open, it enables PFM (pulse-frequency modulation) for optimal light-load efficiency; and when connected to INTVCC, it selects DCM (discontinuous conduction mode). Additionally, applying an external clock signal (1.1× to 1.4× the RT-set frequency) synchronizes switching across multiple MAX17633CATP+ devices-critical for noise-sensitive multi-rail systems. The MAX17633CATP+ ignores external clocks in PFM mode.
Can the MAX17633CATP+ operate with a pre-biased output?
Yes, the MAX17633CATP+ supports monotonic startup into a pre-biased output voltage-a key requirement for hot-swap and redundant power systems. Its soft-start circuitry prevents reverse current flow during turn-on by controlling the duty cycle ramp, even when the output is already held at a non-zero voltage. This behavior is confirmed in typical operating waveforms (e.g., Figure 16 in the datasheet) and is enabled by internal design features that decouple SS timing from output voltage state. Designers can rely on this capability without adding external circuitry.
What thermal performance can be expected from the MAX17633CATP+ in a standard PCB layout?
In a four-layer PCB layout matching the MAX17633 evaluation kit (with exposed pad connected to SGND via ≥4 thermal vias), the MAX17633CATP+ achieves a junction-to-ambient thermal resistance (θJA) of 26°C/W. At 3.5A load and 24V input, typical power dissipation is ~1.2W, resulting in ~31°C junction-to-ambient rise above ambient-well within the +150°C maximum junction temperature limit. Derating begins above +70°C ambient (30.3mW/°C), supporting reliable operation up to +125°C ambient. Proper EP connection is mandatory to achieve this performance.
Does the MAX17633CATP+ include built-in protection features?
Yes, the MAX17633CATP+ integrates multiple protection functions: hiccup-mode overcurrent protection triggers after sustained overload and cycles until fault clears; thermal shutdown activates at +165°C with 10°C hysteresis; adjustable EN/UVLO prevents operation outside safe input range; and output-voltage monitoring drives the open-drain RESET pin low if FB falls below 92% of regulation. These features ensure robust operation in harsh industrial environments without requiring external supervision circuitry.
MAX17633CATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-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:
- 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+ FAQ
1.How can I place an order for MAX17633CATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17633CATP+ 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+ reliable?
The price and inventory of MAX17633CATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17633CATP+ is usually 5 days.
3.What payment methods are accepted for MAX17633CATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17633CATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17633CATP+?
MAX17633CATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17633CATP+ 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+?
For technical support, including MAX17633CATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17633CATP+ requirements.
6.How does Aetrix verify that MAX17633CATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17633CATP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17633CATP+?
All MAX17633CATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17633CATP+, 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+ part is unused and in its original packaging.
Return procedure for MAX17633CATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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