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Analog Devices Inc./Maxim Integrated MAX17643ATC+
- Part No.:
- MAX17643ATC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17643ATC+.pdf
- Description:
- IC REG BUCK ADJ 2A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,258
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Product details
Overview
The MAX17643ATC+ from Analog Devices is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4.5V to 60V input and delivering up to 2A 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-voltage regulation.
For engineers reviewing the MAX17643ATC+ datasheet, MAX17643ATC+ pinout, MAX17643ATC+ application, or MAX17643ATC+ equivalent, key selection considerations include its 400kHz–2.2MHz adjustable switching frequency, hiccup-mode overload protection, programmable EN/UVLO threshold, monotonic startup into prebiased loads, and compliance with CISPR32 Class B emissions.
Technical Context
The MAX17643ATC+ 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 predictable EMI behavior and eliminates subharmonic oscillation without requiring external compensation networks.
It integrates dual LDOs - one powered from VIN and another from EXTVCC - with automatic switchover at ~4.7V, improving efficiency at high input voltages. The device supports external synchronization via RT/SYNC with 1.1× to 1.4× capture range and includes built-in RESET monitoring with 92% undervoltage trip and 95% release thresholds referenced to FB.
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. |
| Output Current Capability | Up to 2A continuous - sufficient for point-of-load regulation of FPGAs, microcontrollers, and communication ICs. |
| Feedback Accuracy | ±1.4% over –40°C to +125°C - ensures tight output voltage regulation across full industrial temperature range. |
| Switching Frequency | 400kHz to 2.2MHz (adjustable via RT/SYNC resistor or external sync) - enables optimization of size vs. efficiency and EMI filtering requirements. |
| Peak Efficiency | 91.6% at 5V/2A output - reduces thermal load and improves system-level power density in space-constrained designs. |
| Shutdown Current | 4.65µA - minimizes standby power loss in battery-backed or energy-sensitive applications. |
| Thermal Shutdown Threshold | 165°C with 15°C hysteresis - protects against sustained overload while allowing safe recovery after cooling. |
Pinout & Package
The MAX17643ATC+ is housed in a thermally enhanced 12-pin TDFN package (3mm × 3mm) with exposed pad (EP), offering low θJA = 41°C/W on multilayer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 4.5V–60V unregulated input; connects directly to input capacitor bank. |
| EN/UVLO | Enable and input undervoltage lockout | Configurable turn-on threshold (1.215V typ); supports resistive divider for precise UVLO setting. |
| RESET | Open-drain output voltage monitor | Asserts low when FB falls below 92% of target; deasserts after 1024 cycles once FB exceeds 95%. |
| SS | Soft-start timing node | Capacitor-to-GND sets soft-start duration; enables monotonic startup into prebiased outputs. |
| VCC | Internal 5V LDO output | Powers internal logic and low-side driver; bypassed with ≥2.2µF ceramic capacitor. |
| RT/SYNC | Oscillator timing and sync input | Resistor-to-GND sets fSW; accepts external clock pulses for system-level synchronization. |
| FB | Feedback input | Monitors output via resistive divider; regulates VOUT with ±1.4% accuracy over temperature. |
| GND | Analog ground reference | Reference for FB, SS, RESET, and internal error amplifier; separate from PGND for noise isolation. |
| EXTVCC | External LDO input | Bypasses internal VIN-powered LDO when >4.7V applied; improves efficiency at high VIN. |
| BST | Bootstrap capacitor node | Connects 0.1µF ceramic capacitor to LX; provides gate drive voltage for high-side MOSFET. |
| LX | Switching node | Drives external inductor; carries high di/dt; requires low-inductance layout to minimize ringing. |
| PGND | Power ground return | High-current return path for LX and internal MOSFETs; must be tied to GND at VCC bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor support | Enables compact, low-profile layouts using only X7R/X5R ceramics - no electrolytics required for stability. |
| Internal compensation | Eliminates need for external Type-II/III compensation network - simplifies design and reduces BOM count. |
| Hiccup-mode overload protection | Shuts down for 32,768 clock cycles upon sustained overcurrent or output short - limits power dissipation and prevents thermal runaway. |
| Programmable soft-start | Adjustable startup time via SS capacitor - prevents inrush current and enables controlled ramp-up into prebiased loads. |
| CISPR32 Class B compliance | Meets conducted and radiated emissions limits without additional shielding or filtering - accelerates EMC certification. |
Applications
| Industrial-Control Power Supplies | Base-Station Power Supplies |
|---|---|
Use Scenario: Regulating 24V or 48V backplane rails to 3.3V/5V for PLC I/O modules and motor drivers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing isolated, low-noise, high-reliability DC-DC conversion. Use Value: Wide 4.5V–60V input accommodates brownout and surge conditions; hiccup protection ensures uptime during field faults. | Use Scenario: Generating 5V/2A for RF transceiver bias and digital baseband subsystems in 4G/5G macrocells. IC Role / Device Role / Timing Role: Point-of-load regulator delivering tightly regulated voltage with fast transient response to pulsed transmit loads. Use Value: 2A peak current capability and low minimum on-time (60ns) minimize output droop during burst-mode transmission. |
| Distributed Supply Regulation | Pulsed-Load Communication Modules |
Use Scenario: Local regulation on remote sensor nodes or edge AI accelerators powered from centralized 12V/24V distribution buses. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete controllers + external MOSFETs. Use Value: Integrated MOSFETs and internal compensation reduce solution size by >40% versus controller-based alternatives. | Use Scenario: Powering LTE-M/NB-IoT modems that draw 1.5A bursts every 10ms during data transmission. IC Role / Device Role / Timing Role: High-efficiency, low-droop DC-DC stage ensuring stable VDD under dynamic load profiles. Use Value: Forced PWM mode maintains regulation during zero-load intervals; 91.6% peak efficiency extends battery life. |
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 |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A output, current-mode control, no internal compensation - requires external loop components. | Automotive AEC-Q100 qualified; lacks RESET output and EXTVCC option. | Choose for automotive environments where qualification outweighs feature set; not drop-in due to lower current and missing functions. |
| TPS54260DGQR | 3.5V–60V input, 2.5A output, voltage-mode control, external compensation, higher quiescent current (120µA). | No hiccup mode; uses external MOSFETs - larger solution size and higher layout complexity. | Prefer when higher output current margin is needed and board area is less constrained; requires redesign of feedback and power stage. |
Compared with LM5164QPWPRQ1 and TPS54260DGQR, the MAX17643ATC+ delivers superior integration (internal MOSFETs + compensation), tighter FB accuracy (±1.4% vs. ±2%), and dedicated features for industrial reliability (RESET, monotonic startup, CISPR32 compliance), making it optimal for space- and performance-critical non-automotive applications.
Availability
MAX17643ATC+ is available at Aetrix Electronics and suitable for industrial-control power supplies, distributed supply regulation, and pulsed-load communication modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17643ATC+ 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, communications, automotive, and consumer markets.
The MAX17643ATC+ belongs to the Himalaya series of high-voltage DC-DC converters designed specifically for cooler, smaller, and simpler power-supply solutions in harsh industrial environments.
FAQ
What is the maximum output current supported by the MAX17643ATC+?
The MAX17643ATC+ supports up to 2A continuous output current. Its peak current-limit threshold is 3.25A (typ), enabling reliable operation under pulsed loads such as communication module transmissions. Thermal derating applies above ambient temperatures where junction temperature exceeds +125°C, and thermal shutdown activates at +165°C to protect the device.
Does the MAX17643ATC+ require external compensation components?
No, the MAX17643ATC+ 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 bill-of-materials cost, and improves layout robustness - especially critical for high-density industrial PCBs.
How does the EXTVCC pin improve efficiency in the MAX17643ATC+?
The EXTVCC pin allows the MAX17643ATC+ to power its internal 5V LDO from an external 4.84V–24V supply instead of VIN, reducing conduction losses in the VIN-powered LDO path. When EXTVCC > 4.7V (typ), the device automatically switches to EXTVCC sourcing, increasing overall efficiency - particularly beneficial at high input voltages like 48V or 60V.
Can the MAX17643ATC+ operate with a prebiased output?
Yes, the MAX17643ATC+ supports monotonic startup into prebiased loads. During soft-start, the device ramps the output voltage from 0V without forcing reverse current through the output capacitor, preventing potential damage or instability in systems where downstream circuitry may already be powered.
What protection features are integrated into the MAX17643ATC+?
The MAX17643ATC+ integrates hiccup-mode overload protection, overtemperature shutdown (165°C with 15°C hysteresis), adjustable EN/UVLO, open-drain RESET with voltage monitoring, and cycle-by-cycle peak current limiting. These features collectively ensure robust operation in adverse industrial environments without requiring external protection circuitry.
MAX17643ATC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX17643ATC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17643ATC+ 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+ reliable?
The price and inventory of MAX17643ATC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17643ATC+ is usually 5 days.
3.What payment methods are accepted for MAX17643ATC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17643ATC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17643ATC+?
MAX17643ATC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17643ATC+ 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+?
For technical support, including MAX17643ATC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17643ATC+ requirements.
6.How does Aetrix verify that MAX17643ATC+ is sourced from the original manufacturer or authorized distributors?
All MAX17643ATC+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17643ATC+?
All MAX17643ATC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17643ATC+, 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+ part is unused and in its original packaging.
Return procedure for MAX17643ATC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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