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Analog Devices Inc./Maxim Integrated MAX17630AATE+
- Part No.:
- MAX17630AATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17630AATE+.pdf
- Description:
- IC REG BUCK ADJ 1A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:131
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Product details
Overview
MAX17630AATE+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 1A output at fixed 3.3V from 4.5V–36V input. It features peak-current-mode control, ±1.2% feedback regulation accuracy over –40°C to +125°C, and operates in PWM/DCM/PFM modes for optimized efficiency across load conditions. Used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17630AATE+ datasheet, MAX17630AATE+ pinout, MAX17630AATE+ application, or MAX17630AATE+ equivalent, key selection considerations include its 16-pin TQFN (3mm × 3mm) package, internal compensation eliminating external RC networks, adjustable switching frequency (400kHz–2.2MHz), hiccup-mode overload protection, and built-in RESET with voltage monitoring.
Technical Context
The MAX17630AATE+ implements peak-current-mode control with slope compensation and built-in loop compensation, enabling stable operation without external compensation components across its full output-voltage range. Its MODE/SYNC pin supports three operating modes-PWM (constant frequency), DCM (light-load discontinuous conduction), and PFM (pulse-frequency modulation)-each with distinct current-limit thresholds and efficiency trade-offs.
It integrates high-side (150–300mΩ) and low-side (100–200mΩ) nMOSFETs, supports external clock synchronization (±40% capture range), and includes auxiliary EXTVCC switchover (4.56–4.84V) to reduce LDO losses when the output is 5V. The device features monotonic soft-start, prebias startup capability, and hiccup-mode OCP triggered by FB undervoltage (e.g., 2.05–2.2V for MAX17630A).
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 external pre-regulation. |
| Output Voltage | Fixed 3.3V - factory-trimmed for ±1.2% regulation accuracy over –40°C to +125°C ambient, eliminating need for external resistor divider. |
| Max Output Current | 1A continuous - specified over full temperature range with thermal shutdown at +165°C and 10°C hysteresis. |
| Switching Frequency | 400kHz to 2.2MHz - programmable via RT resistor or external clock sync; enables compact magnetics and EMI optimization. |
| Efficiency Peak | 95% - achieved in PWM mode at mid-load; PFM/DCM modes maintain >80% efficiency down to 20mA load. |
| Shutdown Current | 2.8μA - ultra-low quiescent draw enables battery-backed or always-on systems with minimal standby loss. |
| Package | 16-pin TQFN (3mm × 3mm, 0.5mm pitch) - thermally enhanced with exposed pad; θJA = 38°C/W on 4-layer board. |
Pinout & Package
MAX17630AATE+ is housed in a 16-pin, 3mm × 3mm TQFN package with exposed thermal pad (EP). The package uses RoHS-compliant lead finish and supports reflow soldering per JEDEC J-STD-020 (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input UVLO Threshold Input | Configures turn-on threshold (1.19–1.26V rising); pull high to enable, tie to VIN for always-on, or use resistor divider for programmable UVLO. |
| 2 VCC | Internal 5V LDO Output | Supplies internal circuitry; bypassed with 2.2μF ceramic to SGND; not intended for external loading. |
| 3 SGND | Analog Ground Reference | Low-noise reference for FB, SS, MODE/SYNC, RESET; must be separated from PGND at single-point connection. |
| 4 MODE/SYNC | Operating Mode Control / Clock Sync Input | Selects PWM (tied to SGND), DCM (tied to VCC), or PFM (open); also accepts external clock (1.1–1.4× fSW) for EMI reduction. |
| 5 SS | Soft-Start Timing Input | Connects to SGND via capacitor to set monotonic ramp time; supports prebiased output startup without reverse current. |
| 6 FB | Feedback Voltage Sense | Direct connection to 3.3V output for MAX17630A; internal 3.3V reference ensures ±1.2% regulation without external resistors. |
| 7 RT | Frequency Programming Input | Resistor-to-SGND sets fSW from 400kHz (open) to 2.2MHz (8.06kΩ); enables layout-driven EMI tuning. |
| 8 RESET | Open-Drain Power-Good Output | Asserts low if FB falls below 92% of target; deasserts after 1024 cycles once FB rises above 95%; supports system sequencing. |
| 9 EXTVCC | Auxiliary Supply Input | Connects to 5V output to power internal LDO, reducing dissipation; unused pins must be tied to SGND. |
| 10 BST | Bootstrap Capacitor Terminal | Requires 0.1μF ceramic between BST and LX to drive high-side MOSFET gate; critical for reliable high-side conduction. |
| 11–12 LX | Power Switching Node | Connects directly to inductor switch node; dual pins reduce parasitic inductance and improve thermal/current handling. |
| 13–14 PGND | Power Ground Return | High-current return path for MOSFETs and inductor; must connect to low-impedance power ground plane with multiple vias. |
| 15–16 VIN | Main Power Input | 4.5V–36V input; decoupled with 2.2μF ceramic close to pins; dual pins minimize IR drop and improve transient response. |
| EP | Exposed Thermal Pad | Must be soldered to SGND plane with ≥4 thermal vias; primary path for heat dissipation (θJC = 10°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and PCB area; enables >95% peak efficiency. |
| Integrated compensation | Removes need for external Type-II/III compensation network, simplifying design and improving stability across all output voltages. |
| Programmable switching frequency | 400kHz–2.2MHz range allows optimization for size (higher fSW → smaller inductor) or efficiency (lower fSW → reduced switching loss). |
| Hiccup-mode overload protection | Auto-retry current limiting prevents thermal runaway during sustained short-circuit or overload, enhancing system reliability. |
| Built-in RESET with voltage monitoring | Provides power-good signaling with 92%/95% FB thresholds and 1024-cycle delay, enabling safe microcontroller reset sequencing. |
| Prebias startup support | Allows controlled ramp-up even when output is precharged, avoiding reverse current flow into downstream loads. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus transceivers in harsh factory environments with 24V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator converting unregulated 24V supply to clean, regulated logic rail. Use Value: High input voltage range (up to 36V) accommodates line transients; -40°C to +125°C operation ensures reliability in cabinet-mounted controllers. |
Use Scenario: Local regulation for FPGAs, microcontrollers, or ADCs on dense PCBs where space and thermal management are constrained. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC stage replacing discrete buck controllers and external MOSFETs. Use Value: 3mm × 3mm TQFN package with integrated MOSFETs and compensation reduces solution footprint by >40% vs. controller-based designs. |
| Distributed Supply Regulation | Base Station Power Supplies |
Use Scenario: Providing isolated 3.3V rails across multi-board telecom chassis using backplane-fed 12V or 48V intermediate bus. IC Role / Device Role / Timing Role: Secondary buck converter at point-of-load, minimizing IR drop and noise coupling from shared bus. Use Value: PFM/DCM light-load modes maintain >85% efficiency at 10mA, extending uptime in always-on remote units. |
Use Scenario: Powering RF front-end ICs and digital baseband processors in 4G/5G small cells with strict EMI limits. IC Role / Device Role / Timing Role: EMI-optimized buck stage with external clock sync and spread-spectrum-capable frequency programming. Use Value: Meets CISPR-22 Class B conducted/radiated EMI limits when used with recommended layout and filter components. |
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 |
|---|---|---|---|
| LM5164QWRXMRQ1 | 4.5V–65V input, 1A, adjustable output; requires external compensation; no integrated EXTVCC switchover. | Automotive AEC-Q100 qualified; wider input range suits 48V systems; lacks fixed 3.3V variant and RESET function. | Choose for automotive-grade 48V applications requiring extended input range; avoid if RESET or fixed 3.3V simplification is required. |
| TPS54332DR | 3.5V–28V input, 3A, adjustable output; external MOSFETs; no internal compensation or RESET. | Higher current rating; lower max input voltage; requires external loop compensation and power-good circuitry. | Choose when >1A output or lower cost per amp is needed; avoid if board space, design cycle time, or integrated protection are priorities. |
Compared with LM5164QWRXMRQ1 and TPS54332DR, the MAX17630AATE+ delivers fixed 3.3V regulation with no external resistors, integrated RESET, and internal compensation-reducing BOM count by 7 components and enabling faster qualification in industrial POE designs.
Availability
MAX17630AATE+ 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 MAX17630AATE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX17630 product line targets high-voltage, high-efficiency DC-DC conversion in space-constrained industrial and telecom systems, emphasizing integration, thermal robustness, and EMI compliance without sacrificing design flexibility.
FAQ
What is the output voltage tolerance of the MAX17630AATE+ over temperature?
The MAX17630AATE+ provides ±1.2% feedback regulation voltage accuracy over the full –40°C to +125°C ambient operating temperature range. This specification applies specifically to the MAX17630A variant's fixed 3.3V output and is guaranteed by design and characterization-not just typical data-ensuring consistent performance in industrial environments where thermal cycling is common. The MAX17630AATE+ achieves this without external trimming components due to factory laser-trimming of its internal reference.
Does the MAX17630AATE+ require external compensation components?
No, the MAX17630AATE+ does not require external compensation components. Its internal compensation network is fully integrated and optimized for stability across the entire output-voltage range of the MAX17630 family-including the fixed 3.3V output of the MAX17630AATE+. This eliminates the need for external Type-II or Type-III compensation networks, reducing component count, PCB area, and design validation effort while maintaining >66° phase margin across operating conditions.
Can the MAX17630AATE+ operate with a prebiased output voltage?
Yes, the MAX17630AATE+ supports monotonic startup into a prebiased output. Its soft-start circuitry and control logic prevent reverse current flow when the output is already charged to a voltage near the target 3.3V rail. This behavior is confirmed in the datasheet's typical operating characteristics (Figures toc23 and toc25), where startup waveforms show controlled ramp-up without undershoot or current reversal-critical for powering live backplanes or hot-swap systems.
What is the minimum on-time specification for the MAX17630AATE+ and why does it matter?
The MAX17630AATE+ has a minimum on-time of 52ns (typical), which directly enables high switching frequencies up to 2.2MHz. This short minimum on-time allows the device to maintain regulation even at very high input-to-output voltage ratios (e.g., 36V → 3.3V), where duty cycles fall below 10%. As a result, designers can use smaller inductors and capacitors, achieving more compact, higher-density power solutions without sacrificing transient response or stability.
How does the RESET function of the MAX17630AATE+ behave during startup and fault conditions?
The RESET output of the MAX17630AATE+ is an open-drain signal that asserts low when the FB pin voltage falls below 92% of its nominal value (e.g., <3.04V for 3.3V output) and deasserts high after FB remains above 95% (e.g., >3.14V) for 1024 switching cycles. During startup, RESET stays low until regulation is established and held; during overload or input brownout, it provides a clean, debounced power-good failure indication compatible with microcontroller reset inputs.
MAX17630AATE+ 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:
- 1A
- 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)
MAX17630AATE+ FAQ
1.How can I place an order for MAX17630AATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17630AATE+ 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 MAX17630AATE+ reliable?
The price and inventory of MAX17630AATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17630AATE+ is usually 5 days.
3.What payment methods are accepted for MAX17630AATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17630AATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17630AATE+?
MAX17630AATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17630AATE+ 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 MAX17630AATE+?
For technical support, including MAX17630AATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17630AATE+ requirements.
6.How does Aetrix verify that MAX17630AATE+ is sourced from the original manufacturer or authorized distributors?
All MAX17630AATE+ 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 MAX17630AATE+ meets industry standards.
7.What is the process for return or replacement of MAX17630AATE+?
All MAX17630AATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17630AATE+, 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 MAX17630AATE+ part is unused and in its original packaging.
Return procedure for MAX17630AATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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