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Analog Devices Inc./Maxim Integrated MAX17633AATP+T
- Part No.:
- MAX17633AATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17633AATP+T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,961
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Product details
Overview
The MAX17633AATP+T from Maxim Integrated is a Himalaya-series synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, delivering up to 3.5A at a fixed 3.3V output across 4.5V–36V input. It features peak-current-mode control, ±1.3% FB regulation accuracy over –40°C to +125°C, and operates in PWM/DCM/PFM modes for optimized efficiency. Used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17633AATP+T datasheet, MAX17633AATP+T pinout, MAX17633AATP+T application, or MAX17633AATP+T equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for point-of-load design, thermal-aware layout, and EMI-compliant deployment.
Technical Context
The MAX17633AATP+T implements peak-current-mode control with internal transconductance error amplifier, slope compensation, and cycle-by-cycle current limiting. Its MODE/SYNC pin selects PWM (constant frequency), PFM (pulse-skipping), or DCM (discontinuous conduction) operation - each altering inductor current behavior and light-load efficiency.
It integrates dual nMOS power switches (RDS(ON)H = 65–125 mΩ, RDS(ON)L = 40–80 mΩ), internal LDO (INTVCC = 5V ±5%), and auxiliary EXTVCC switchover (4.56–4.84V threshold) to reduce conduction loss. Feedback regulation uses a precision 3.3V reference (VFB_REG = 3.3V ±1.3%) with built-in compensation eliminating external RC networks.
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 Voltage | Fixed 3.3V - factory-trimmed for ±1.3% regulation accuracy over –40°C to +125°C ambient, enabling direct microcontroller core supply. |
| Max Output Current | 3.5A continuous - rated across full temperature range with thermal shutdown at 165°C and 10°C hysteresis. |
| Switching Frequency | 400kHz to 2.2MHz adjustable via RT resistor - allows optimization of size vs. efficiency; default 500kHz when RT open. |
| Efficiency Peak | >93% - achieved at mid-load in PWM mode with 24V input and 3.3V/3.5A output, reducing thermal load on PCB. |
| Shutdown Current | 2.8μA - enables ultra-low-power system standby states without external disconnect circuitry. |
| CISPR 22 Class B | Compliant - meets radiated EMI limits per standard when used with recommended layout and MAX17633CEVKIT# reference design. |
Pinout & Package
Package: 20-pin TQFN (4mm × 4mm, exposed pad), RoHS-compliant, thermal resistance θJA = 26°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 PGND | Power Ground | High-current return path for LX switching node; must connect directly to low-impedance 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-frequency ripple. |
| 4 EN/UVLO | Enable / Input UVLO Control | Logic-enable input with programmable turn-on threshold (1.19–1.26V rising); connects to resistor divider from IN for custom UVLO. |
| 5 RESET | Open-Drain Fault Indicator | Asserts low if FB falls below 92% of regulation; deasserts after 1024 cycles once FB rises above 95% - provides clean power-good signaling. |
| 6 INTVCC | Internal 5V LDO Output | Supplies internal circuitry; bypassed with 2.2μF ceramic to SGND; not intended for external loading. |
| 7 SGND | Analog Ground Reference | Separate low-noise ground for feedback, soft-start, and sync circuits; must be tied to PGND at single point near IC. |
| 8 SS | Soft-Start Timing Input | Connects to capacitor to SGND; sets monotonic startup time and prevents output overshoot during power-up or pre-biased conditions. |
| 9 FB | Feedback Input | Monitors regulated 3.3V output directly; internal 3.3V reference enables fixed-output operation without external resistors. |
| 10 RT | Frequency Programming | Resistor-to-SGND sets fSW from 400kHz to 2.2MHz; open-circuit defaults to 500kHz - critical for EMI filtering and inductor selection. |
| 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 | Connects to 5V output to power internal LDO, reducing dropout loss and improving efficiency at high VIN; tie to SGND if unused. |
| 13, 16 NC | No Connect | Unbonded pins; must remain floating - no routing or copper connection permitted. |
| 17–19 LX | Switching Node | Three parallel pins carry high di/dt switching current to inductor; require short, wide copper traces and tight loop area with PGND. |
| 20 BST | Bootstrap Capacitor Terminal | Connects 0.1μF ceramic capacitor to LX; provides gate drive voltage for high-side MOSFET - critical for reliable 100% duty cycle capability. |
| EP | Exposed Thermal Pad | Mandatory connection to SGND plane with ≥6 thermal vias (0.3mm diameter); primary path for heat dissipation (θJC = 2°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated 65mΩ/40mΩ high-side/low-side nMOS eliminates external Schottky diode, reducing conduction loss and board area. |
| Internal Compensation | Factory-compensated across full output voltage range - removes need for external Type-II/III compensation network and saves 3–4 passives. |
| Multi-Mode Operation | PWM (fixed fSW), PFM (light-load pulse skipping), and DCM (valley-current zero-crossing) enable >85% efficiency down to 10mA load. |
| Hiccup-Mode Overload Protection | Enters current-limited hiccup after 32768 cycles of fault detection - protects against sustained short-circuit without thermal runaway. |
| Pre-Biased Soft-Start | Supports monotonic startup into pre-charged output (e.g., hot-swap or backup rail); prevents reverse current flow into VOUT. |
| Programmable EN/UVLO Threshold | Adjustable turn-on voltage via resistor divider on EN/UVLO pin - enables precise brown-out recovery and sequencing control. |
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 3.3V buck regulator delivering 3.5A to FPGA configuration banks and ARM Cortex-M7 cores. Use Value: Wide 4.5V–36V input tolerance accommodates 24V bus sag during motor startup; ±1.3% regulation ensures ADC reference stability. |
Use Scenario: Local regulation for high-speed communication ICs (e.g., RS-485 transceivers, CAN FD controllers) on dense PCBs. IC Role / Device Role / Timing Role: Compact 3.3V PoL converter replacing discrete buck solutions in space-constrained edge nodes. Use Value: 4mm × 4mm TQFN package with integrated MOSFETs reduces footprint by >40% versus controller+external FET designs. |
| Distributed Supply Regulation | Base-Station Power Supplies |
Use Scenario: Distributed 3.3V rail generation across multi-board telecom chassis using backplane 48V intermediate bus. IC Role / Device Role / Timing Role: Secondary-side buck converter on daughter cards, synchronized via MODE/SYNC to master clock. Use Value: External clock synchronization (1.1–1.4× fSW) eliminates beat frequencies and simplifies EMI filter design across multiple rails. |
Use Scenario: Powering RF front-end bias circuits and digital baseband processors in 5G small-cell units with 28V or 36V input. IC Role / Device Role / Timing Role: High-efficiency 3.3V supply for analog front-end (AFE) and ADC/DAC subsystems requiring low noise and fast transient response. Use Value: 52ns minimum on-time enables 2.2MHz operation, shrinking inductor size while maintaining <100mV load transient deviation. |
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 only; no fixed 3.3V variant; requires external compensation. | Automotive AEC-Q100 qualified; wider input range suits 48V truck/bus systems but lacks factory-trimmed 3.3V option. | Select LM5164QPWPRQ1 only when >36V input or automotive qualification is mandatory; adds design complexity due to external loop compensation. |
| TPS54332DR | 3.5V–28V input, 3A max, fixed 3.3V option; no EXTVCC, lower peak efficiency (~91%), no PFM/DCM modes. | Lower-cost solution for non-industrial environments; lacks hiccup protection and CISPR 22 Class B compliance. | Choose TPS54332DR for cost-sensitive consumer applications where 36V input headroom and EMI certification are not required. |
Compared with LM5164QPWPRQ1 and TPS54332DR, the MAX17633AATP+T offers factory-trimmed 3.3V output with ±1.3% accuracy, integrated compensation, EXTVCC efficiency boost, and full industrial temperature support - making it optimal for high-reliability 24V/36V industrial PoL designs.
Availability
MAX17633AATP+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 assurance, and traceable sourcing.
Supply support for MAX17633AATP+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX17633 series belongs to the Himalaya power portfolio, engineered specifically for compact, high-efficiency, and thermally robust DC-DC conversion in harsh industrial environments with wide input ranges and stringent EMI requirements.
FAQ
What is the output voltage tolerance of the MAX17633AATP+T over temperature?
The MAX17633AATP+T guarantees ±1.3% feedback regulation accuracy over the full operating temperature range of –40°C to +125°C ambient. This specification applies to the internal 3.3V reference and ensures stable microcontroller core voltage even under thermal stress in industrial enclosures. The MAX17633AATP+T achieves this via factory trimming and built-in temperature compensation within the error amplifier block.
Can the MAX17633AATP+T operate with a 36V input and deliver 3.5A continuously?
Yes, the MAX17633AATP+T is fully rated for 36V maximum input and 3.5A continuous output across –40°C to +125°C ambient. Its thermal design - including 2°C/W junction-to-case resistance and mandatory EP grounding - enables this performance when mounted on a 4-layer PCB with adequate copper area and airflow. Derating is not required at 36V/3.5A if θJA ≤ 26°C/W is maintained.
Does the MAX17633AATP+T support external clock synchronization?
Yes, the MAX17633AATP+T supports external clock synchronization via the MODE/SYNC pin. When an external clock signal between 1.1× and 1.4× the RT-set frequency is applied, the device locks to that frequency within 16 cycles and remains in PWM mode. This feature is essential for noise-sensitive multi-rail systems like base stations, and is confirmed in the Electrical Characteristics table under SYNC Frequency-Capture Range.
What is the purpose of the EXTVCC pin on the MAX17633AATP+T?
The EXTVCC pin on the MAX17633AATP+T provides an auxiliary supply path to power the internal LDO, reducing conduction loss and improving efficiency - especially at high input voltages. When connected to the 5V output rail (only applicable for MAX17633B/C variants), it bypasses the INTVCC LDO dropout. For the MAX17633AATP+T (3.3V fixed), EXTVCC must be tied to SGND since the 3.3V output cannot power the 5V LDO.
How does the MAX17633AATP+T handle startup into a pre-biased output?
The MAX17633AATP+T supports monotonic startup into a pre-biased output voltage via its programmable soft-start (SS pin) and valley-current limiting architecture. When enabled, it prevents reverse current flow from VOUT into the LX node during power-up, avoiding potential damage to downstream components. This behavior is validated in Figure 16 of the datasheet showing clean 3.3V ramp-up with 1.65V pre-bias.
MAX17633AATP+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)
MAX17633AATP+T FAQ
1.How can I place an order for MAX17633AATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17633AATP+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 MAX17633AATP+T reliable?
The price and inventory of MAX17633AATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17633AATP+T is usually 5 days.
3.What payment methods are accepted for MAX17633AATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17633AATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17633AATP+T?
MAX17633AATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17633AATP+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 MAX17633AATP+T?
For technical support, including MAX17633AATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17633AATP+T requirements.
6.How does Aetrix verify that MAX17633AATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17633AATP+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 MAX17633AATP+T meets industry standards.
7.What is the process for return or replacement of MAX17633AATP+T?
All MAX17633AATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17633AATP+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 MAX17633AATP+T part is unused and in its original packaging.
Return procedure for MAX17633AATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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