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Analog Devices Inc./Maxim Integrated MAX17634BATP+
- Part No.:
- MAX17634BATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17634BATP+.pdf
- Description:
- IC REG BUCK 5V 4.25A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:485
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Product details
Overview
The MAX17634BATP+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 4.25A at a fixed 5V output. It operates across a 4.5V–36V input range, features ±1.3% feedback regulation accuracy over –40°C to +125°C, and uses peak-current-mode control. It is deployed in industrial control power supplies where stable, high-voltage-to-5V conversion is required under wide ambient temperature and load variation.
For engineers reviewing the MAX17634BATP+ datasheet, MAX17634BATP+ pinout, MAX17634BATP+ application, or MAX17634BATP+ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives with functional distinctions, and supply-chain support tailored for industrial embedded and high-reliability power designs.
Technical Context
The MAX17634BATP+ implements peak-current-mode control with internal transconductance error amplifier, slope compensation, and PWM comparator - enabling precise duty-cycle control and fast transient response. Its architecture supports forced PWM, PFM, and DCM modes via the MODE/SYNC pin, with automatic hiccup-mode overload protection and monotonic startup into prebiased outputs.
It integrates high-side (60–115mΩ) and low-side (37–73mΩ) nMOSFETs, features an auxiliary EXTVCC input to reduce LDO losses when VOUT = 5V, and includes built-in loop compensation eliminating external RC networks across its fixed 5V output configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - enables direct use with 12V/24V industrial rails and wide-input wall adapters without pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.3% over –40°C to +125°C - ensures stable USB-peripheral, MCU core, or logic rail supply across full industrial temperature range. |
| Max Output Current | 4.25A continuous - supports high-power FPGA I/O banks, multi-rail SoC subsystems, or dual USB ports from single IC. |
| Switching Frequency | 400kHz to 2.2MHz (adjustable via RT resistor or external sync) - allows optimization of inductor size vs. EMI; default 500kHz balances efficiency and BOM cost. |
| Feedback Regulation Accuracy | ±1.3% over –40°C to +125°C - guarantees tight voltage tolerance for sensitive analog circuitry without post-regulation LDOs. |
| Peak Efficiency | 94% at 24VIN/5VOUT - reduces thermal stress and improves system-level power density in enclosed enclosures. |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-harvested systems. |
Pinout & Package
MAX17634BATP+ is housed in a 20-pin, 4mm × 4mm TQFN package with exposed thermal pad (EP), optimized for high-power density and thermal performance on multilayer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | PGND | Power ground return for high-current LX switching path; must connect to dedicated low-impedance PGND plane with multiple vias. |
| 2, 3, 14 | IN | Main input supply (4.5V–36V); requires ≥4.7µF ceramic decoupling placed adjacent to pins to suppress high-frequency ripple. |
| 4 | EN/UVLO | Enable/undervoltage lockout input; rising threshold 1.215V enables operation; configurable via resistor divider for custom turn-on voltage. |
| 5 | RESET | Open-drain reset output asserted low when FB falls below 92% of regulation; deasserts after 1024 cycles once FB rises above 95%. |
| 6 | INTVCC | 5V internal LDO output (4.75–5.25V); powers internal circuitry; bypass with 2.2µF ceramic to SGND; not for external loading. |
| 7 | SGND | Analog reference ground; separate from PGND to minimize noise coupling into feedback and control loops. |
| 8 | SS | Soft-start capacitor node; controls ramp rate of output voltage during startup to prevent inrush current and overshoot. |
| 9 | FB | Fixed 5V feedback input - internally connected to 5.0V reference; no external resistor divider required. |
| 10 | RT | Frequency programming pin - connect resistor to SGND to set fSW from 400kHz to 2.2MHz; open for default 500kHz. |
| 11 | MODE/SYNC | Mode selection and external clock sync input - SGND = PWM, open = PFM, INTVCC = DCM; accepts 1.1–1.4× fSW sync signal. |
| 12 | EXTVCC | Auxiliary supply input - connect to 5V output to power internal LDO, reducing conduction loss and improving efficiency by ~1–2%. |
| 13, 16 | NC | No connection - leave unconnected; not internally bonded. |
| 17–19 | LX | Switching node - connects directly to inductor; three parallel pins reduce trace resistance and improve thermal dissipation. |
| 20 | BST | Bootstrap capacitor terminal - requires 0.1µF ceramic between BST and LX to drive high-side MOSFET gate. |
| EP | Exposed Pad | Thermal and electrical ground - must be soldered and connected to SGND plane via ≥6 thermal vias for θJA = 26°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET integration | Eliminates external Schottky diode, reducing BOM count and board area while enabling >94% peak efficiency. |
| Internal loop compensation | Removes need for external Type-II/III compensation network - simplifies layout and eliminates tuning iterations for fixed 5V output. |
| Adjustable UVLO and soft-start | EN/UVLO threshold programmable via resistor divider; SS capacitor sets monotonic startup into prebiased outputs - prevents reverse current flow. |
| Hiccup-mode overload protection | Automatically enters current-limited restart cycle on sustained short-circuit - protects MOSFETs and inductor without thermal shutdown delay. |
| Three operating modes (PWM/PFM/DCM) | Enables dynamic efficiency optimization: PWM for EMI-sensitive apps, PFM for ultra-low-light-load (<10mA), DCM for mid-load efficiency balance. |
| RESET with voltage monitoring | Provides system-level power-good signaling with 92%/95% hysteresis thresholds - supports microcontroller reset sequencing and brownout detection. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus transceivers from 24V DC rails in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying isolated RS-485 transceivers, ADC references, and microcontroller peripherals. Use Value: Delivers 4.25A at ±1.3% regulation across –40°C to +125°C ambient, ensuring reliable operation without derating in uncooled enclosures. |
Use Scenario: Local 5V rail generation for FPGA configuration, DDR memory termination, and PCIe slot power in telecom baseband cards. IC Role / Device Role / Timing Role: High-current point-of-load converter replacing discrete controllers + external FETs, minimizing solution footprint. Use Value: 400kHz–2.2MHz adjustable switching frequency enables optimal inductor selection to meet strict EMI limits in dense board layouts. |
| Distributed Supply Regulation | Base Station Power Supplies |
|
Use Scenario: Distributed 5V power delivery across modular backplanes in test equipment and modular instrumentation racks. IC Role / Device Role / Timing Role: Secondary regulator downstream of 48V intermediate bus, providing clean, regulated 5V to plug-in modules. Use Value: Built-in EXTVCC input reduces power loss when VOUT = 5V, improving full-load efficiency by ~1.2% versus standard LDO-fed architectures. |
Use Scenario: Powering RF front-end bias circuits, digital baseband processors, and cooling fan controllers in macrocell base stations. IC Role / Device Role / Timing Role: High-reliability 5V supply with hiccup-mode protection and thermal shutdown - critical for 24/7 outdoor deployment. Use Value: Junction temperature rating up to +150°C and robust -40°C cold-start capability ensure uninterrupted operation in harsh environmental conditions. |
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 max, fixed 5V not available - requires external feedback resistors; no EXTVCC; lower light-load efficiency in PFM mode. | Automotive AEC-Q100 qualified; wider VIN suits 48V truck/bus systems; lacks integrated 5V reference and RESET functionality. | Select LM5164QPWPRQ1 only when automotive qualification or >36V input is mandatory; MAX17634BATP+ preferred for industrial 5V PoL simplicity and reliability. |
| TPS54560BQDDARQ1 | 4.5V–60V input, 5A max, but fixed 5V variant unavailable; requires external compensation; no PFM/DCM modes; higher IQ (146μA vs. 96μA). | Also AEC-Q100 rated; better overtemperature protection hysteresis; lacks soft-start monotonicity and prebias startup support. | Choose TPS54560BQDDARQ1 if automotive-grade 5A output is needed; MAX17634BATP+ offers superior light-load efficiency, smaller solution size, and simpler 5V implementation. |
Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MAX17634BATP+ provides out-of-the-box 5V regulation with no external resistors, integrated RESET with hysteresis, and industry-leading 2.8μA shutdown current - making it optimal for space-constrained, thermally demanding industrial 5V PoL designs.
Availability
MAX17634BATP+ is available at Aetrix Electronics and suitable for industrial control power supplies, distributed supply regulation, and base station power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX17634BATP+ 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, medical, and communications applications.
The MAX17634x family targets high-voltage, high-efficiency DC-DC conversion in space- and thermal-constrained industrial systems - emphasizing integrated FETs, internal compensation, and robust protection features for unattended operation.
FAQ
What is the output voltage tolerance of the MAX17634BATP+ over temperature?
The MAX17634BATP+ maintains a fixed 5.0V output with ±1.3% regulation accuracy across the full –40°C to +125°C ambient operating temperature range. This specification is guaranteed by design and characterization, not just typical data, ensuring consistent performance in industrial environments without additional post-regulation circuitry.
Does the MAX17634BATP+ require external compensation components?
No, the MAX17634BATP+ includes fully integrated loop compensation optimized for its fixed 5V output configuration. Unlike adjustable regulators, it eliminates the need for external Type-II or Type-III compensation networks - reducing BOM count, PCB area, and design validation effort.
Can the MAX17634BATP+ operate with an external clock synchronization signal?
Yes, the MAX17634BATP+ supports external clock synchronization via the MODE/SYNC pin. When a valid clock signal (1.1× to 1.4× the RT-set frequency, ≥50ns pulse width) is applied, the device locks to that frequency and operates in PWM mode - enabling EMI reduction through frequency dithering or system-level clock alignment.
What is the purpose of the EXTVCC pin on the MAX17634BATP+?
The EXTVCC pin on the MAX17634BATP+ accepts an external 5V supply (e.g., from the output rail) to power the internal LDO, reducing conduction loss and improving full-load efficiency by approximately 1–2%. It must only be used when VOUT = 5V; otherwise, it should be tied to SGND.
How does the MAX17634BATP+ handle short-circuit conditions?
The MAX17634BATP+ employs hiccup-mode overload protection: upon detecting overcurrent, it shuts down, waits for thermal recovery, then attempts restart. This cycle repeats continuously during sustained short-circuit - limiting average power dissipation and preventing MOSFET thermal runaway without requiring manual reset.
MAX17634BATP+ 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 4.25A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX17634BATP+ FAQ
1.How can I place an order for MAX17634BATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17634BATP+ 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 MAX17634BATP+ reliable?
The price and inventory of MAX17634BATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17634BATP+ is usually 5 days.
3.What payment methods are accepted for MAX17634BATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17634BATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17634BATP+?
MAX17634BATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17634BATP+ 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 MAX17634BATP+?
For technical support, including MAX17634BATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17634BATP+ requirements.
6.How does Aetrix verify that MAX17634BATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17634BATP+ 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 MAX17634BATP+ meets industry standards.
7.What is the process for return or replacement of MAX17634BATP+?
All MAX17634BATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17634BATP+, 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 MAX17634BATP+ part is unused and in its original packaging.
Return procedure for MAX17634BATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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