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Analog Devices Inc./Maxim Integrated MAX17643ATC+T
- Part No.:
- MAX17643ATC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17643ATC+T.pdf
- Description:
- IC REG BUCK ADJ 2A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:395
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Product details
Overview
MAX17643ATC+T from Analog Devices is a high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4.5V to 60V input and delivering up to 2A continuous output current. It features peak-current-mode control, fixed-frequency forced PWM operation, ±1.4% FB regulation accuracy over –40°C to +125°C, and internal compensation eliminating external loop components. It is used in industrial-control power supplies and pulsed-load communication modules requiring stable, compact, high-efficiency regulation.
For engineers reviewing the MAX17643ATC+T datasheet, MAX17643ATC+T pinout, MAX17643ATC+T application, or MAX17643ATC+T equivalent, key selection considerations include its 4.5V–60V input range, adjustable 0.9V–(0.9×VIN) output, 400kHz–2.2MHz programmable switching frequency, hiccup-mode overload protection, and 3mm×3mm TDFN package with exposed pad for thermal management.
Technical Context
The MAX17643ATC+T implements a peak-current-mode control architecture with slope compensation, enabling stable operation across wide duty cycles and input/output combinations. Its fixed-frequency forced PWM mode ensures consistent EMI behavior and eliminates subharmonic oscillation without external compensation.
It integrates dual LDOs - one powered from VIN and another from EXTVCC - with automatic switchover at ~4.7V to maximize efficiency at high input voltages. The device supports monotonic startup into prebiased loads and includes built-in output voltage monitoring with open-drain RESET assertion at 92% VOUT and deassertion at 95% VOUT after 1024 clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide industrial and telecom input rails including 12V, 24V, 36V, 48V, and 60V systems without external pre-regulation. |
| Output Current | Up to 2A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, and communication ICs in single-board systems. |
| Feedback Accuracy | ±1.4% over –40°C to +125°C - ensures tight output regulation across full industrial temperature range without calibration. |
| Switching Frequency | 400kHz to 2.2MHz (programmable via RT/SYNC resistor or external sync) - enables optimization of size vs. efficiency and EMI filtering requirements. |
| Peak Efficiency | 91.6% at 5V/2A, VIN=24V - reduces thermal load and improves system-level power density in space-constrained designs. |
| Shutdown Current | 4.65µA - enables ultra-low-power standby modes in battery-backed or energy-harvesting applications. |
| Thermal Protection | 165°C shutdown with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
The MAX17643ATC+T is housed in a 12-pin, 3mm × 3mm TDFN package with exposed pad (package code TD1233+1C), optimized for thermal performance and board area efficiency. The exposed pad must be soldered to a large GND plane using multiple thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary power input | Accepts 4.5V–60V unregulated supply; connects directly to input capacitor bank and must be decoupled locally. |
| EN/UVLO | Enable and input undervoltage lockout | Configurable turn-on threshold (1.215V typical); supports resistor-divider programming for system-level brownout protection. |
| RESET | Open-drain power-good monitor | Asserts low when FB falls below 92% VOUT; deasserts after 1024 cycles once FB exceeds 95% - provides reliable sequencing signal for downstream logic. |
| SS | Soft-start timing node | Connects to external capacitor to set ramp time; controls inrush current and prevents output overshoot during startup. |
| VCC | Internal 5V LDO output | Powers internal circuitry and low-side driver; requires ≥2.2µF ceramic bypass to GND; sourced either from VIN or EXTVCC depending on voltage level. |
| RT/SYNC | Oscillator timing and synchronization | Resistor sets switching frequency (400kHz–2.2MHz); accepts external clock pulses for system-level timing alignment. |
| FB | Feedback input | Monitors output voltage via resistive divider; regulates to 0.9V reference with ±1.4% accuracy across temperature and line. |
| GND | Analog ground reference | Reference for FB, SS, RESET, and EN/UVLO; must be connected to PGND at VCC bypass capacitor location to minimize noise coupling. |
| EXTVCC | External LDO input | Accepts 4.84V–24V supply to bypass internal VIN-powered LDO, improving efficiency at high input voltages. |
| BST | Bootstrap capacitor node | Connects 0.1µF ceramic capacitor to LX to generate gate drive voltage for high-side MOSFET; critical for proper high-side conduction. |
| LX | Switching node | Drives external inductor; carries high di/dt; must be routed short and wide with minimal loop area to reduce EMI and losses. |
| PGND | Power ground return | High-current return path for LX and internal MOSFETs; must be connected to GND at VCC bypass point and tied to large copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor support | Enables compact, high-reliability layouts without electrolytic capacitors - ideal for extended-life industrial deployments. |
| Internal compensation | Eliminates need for external Type-II or Type-III compensation networks, reducing BOM count and layout sensitivity. |
| Hiccup-mode overload protection | Shuts down for 32,768 clock cycles upon sustained overcurrent or output short, limiting average power dissipation and preventing thermal runaway. |
| Adjustable soft-start | Prevents inrush current spikes and output voltage overshoot by controlling ramp rate via external SS capacitor. |
| Programmable EN/UVLO threshold | Allows precise system-level brownout detection using simple resistor divider - avoids premature shutdown during transient dips. |
| Monotonic startup into prebiased load | Ensures safe power-up even when output is already biased (e.g., back-fed by other regulators), preventing reverse current flow. |
Applications
| Industrial-Control Power Supplies | Communication Modules |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and sensor interfaces in factory automation cabinets with 24V or 48V DC bus inputs. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 48V rail to 5V/3.3V for microcontrollers and isolated gate drivers. Use Value: Wide 4.5V–60V input range accommodates bus fluctuations; hiccup-mode protection sustains operation during momentary shorts in noisy industrial environments. | Use Scenario: Supplying burst-mode transceivers (e.g., LTE, LoRa, Wi-Fi SoCs) that draw 2A peaks for brief transmission intervals. IC Role / Device Role / Timing Role: High-current, low-droop buck converter maintaining regulated 3.3V during RF transmit bursts. Use Value: 2A peak current capability and low minimum on-time (60ns) minimize output voltage droop under pulsed loads without oversized output capacitance. |
| Distributed Supply Regulation | Base-Station Power Supplies |
Use Scenario: Local regulation on remote I/O cards or fieldbus nodes where centralized 12V/24V distribution is used. IC Role / Device Role / Timing Role: Compact, thermally efficient local DC-DC stage replacing linear regulators or larger discrete solutions. Use Value: 3mm×3mm TDFN package with exposed pad enables high power density on space-constrained boards; 91.6% peak efficiency reduces localized heating. | Use Scenario: Intermediate conversion in macrocell or small-cell base station subsystems, stepping down 48V telecom rectified input to 5V/3.3V for digital processing units. IC Role / Device Role / Timing Role: High-input-voltage buck converter meeting CISPR32 Class B conducted/radiated emissions requirements. Use Value: Integrated MOSFETs, internal compensation, and fixed-frequency PWM simplify EMI filter design and ensure compliance without added shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | Automotive-grade AEC-Q100 qualified; 3V–65V input; 1.5A output; requires external compensation. | Targeted for automotive infotainment and ADAS power rails; lacks internal compensation and RESET output. | Choose LM5164QDDARQ1 only if AEC-Q100 qualification and higher VIN max are required - trade-off includes added compensation components and no integrated power-good signal. |
| TPS54260DGQR | 6V–60V input; 2.5A output; external MOSFETs; requires external compensation and bootstrap capacitor. | Suitable for cost-sensitive, non-space-constrained designs where thermal headroom allows discrete FETs. | Choose TPS54260DGQR when higher output current (2.5A) and flexibility in MOSFET selection outweigh the penalty of larger footprint and increased component count. |
Compared with LM5164QDDARQ1 and TPS54260DGQR, the MAX17643ATC+T delivers superior integration (internal MOSFETs, compensation, RESET, and dual-LDO power management) in a smaller 3mm×3mm footprint - making it optimal for industrial and telecom point-of-load applications where board area, thermal performance, and functional completeness are prioritized.
Availability
MAX17643ATC+T is available at Aetrix Electronics and suitable for industrial-control power supplies, communication modules, and distributed supply regulation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17643ATC+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX17643ATC+T belongs to the Himalaya series of high-voltage DC-DC converters designed specifically for cooler, smaller, and simpler power-supply solutions in harsh industrial and telecom environments.
FAQ
What is the maximum output current capability of the MAX17643ATC+T?
The MAX17643ATC+T delivers up to 2A continuous output current. Its peak current-limit threshold is 3.25A (typical), enabling robust pulsed-load handling in applications like communication modules. Actual achievable output current depends on input voltage, output voltage, ambient temperature, and PCB thermal design - with thermal shutdown activating at junction temperatures above 165°C.
Does the MAX17643ATC+T require external compensation components?
No, the MAX17643ATC+T features built-in compensation across its entire output-voltage range (0.9V to 0.9×VIN), eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces component count, and improves stability margin without requiring loop analysis or tuning.
How does the MAX17643ATC+T handle output short-circuit conditions?
The MAX17643ATC+T employs hiccup-mode overload protection: upon detecting sustained overcurrent or output short, it suspends switching for 32,768 clock cycles before attempting soft-start again. This limits average power dissipation and prevents thermal damage while allowing automatic recovery once the fault clears - critical for unattended industrial systems.
Can the MAX17643ATC+T be synchronized to an external clock source?
Yes, the MAX17643ATC+T supports external frequency synchronization via the RT/SYNC pin. An external clock signal (logic-high >2.1V, logic-low <0.8V, pulse-width >50ns) can be coupled through a capacitor to align the internal oscillator. The internal frequency locks to the external clock after detecting 16 edges, enabling system-level timing coordination and EMI reduction.
What is the purpose of the EXTVCC pin on the MAX17643ATC+T?
The EXTVCC pin on the MAX17643ATC+T accepts an external 4.84V–24V supply to power the internal 5V VCC LDO, bypassing the VIN-powered LDO. This improves efficiency at high input voltages (e.g., 48V) by reducing dropout losses. When EXTVCC is absent or below ~4.7V, the device automatically reverts to VIN-based VCC regulation.
MAX17643ATC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN 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):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 54V
- Current - Output:
- 2A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX17643ATC+T FAQ
1.How can I place an order for MAX17643ATC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17643ATC+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 MAX17643ATC+T reliable?
The price and inventory of MAX17643ATC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17643ATC+T is usually 5 days.
3.What payment methods are accepted for MAX17643ATC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17643ATC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17643ATC+T?
MAX17643ATC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17643ATC+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 MAX17643ATC+T?
For technical support, including MAX17643ATC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17643ATC+T requirements.
6.How does Aetrix verify that MAX17643ATC+T is sourced from the original manufacturer or authorized distributors?
All MAX17643ATC+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 MAX17643ATC+T meets industry standards.
7.What is the process for return or replacement of MAX17643ATC+T?
All MAX17643ATC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17643ATC+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 MAX17643ATC+T part is unused and in its original packaging.
Return procedure for MAX17643ATC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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