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Analog Devices Inc./Maxim Integrated MAX17571ATC+
- Part No.:
- MAX17571ATC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17571ATC+.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:952
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Product details
Overview
MAX17571ATC+ from Analog Devices is a high-voltage synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 1.5A output current across a 4V–60V input range, supporting adjustable output voltages from 0.9V to 90% of VIN, and operating at 400kHz–2.2MHz switching frequency. It targets industrial power rails, factory automation I/O modules, and distributed power architectures requiring robust regulation under wide-input, high-temperature conditions.
For engineers reviewing the MAX17571ATC+ datasheet, MAX17571ATC+ pinout, MAX17571ATC+ application, or MAX17571ATC+ equivalent, key selection criteria include its internal compensation eliminating external loop components, built-in hiccup-mode overload protection, ±1.2% FB regulation accuracy over –40°C to +125°C, and EXTVCC bias input enabling efficiency optimization in high-VIN designs.
Technical Context
The MAX17571ATC+ employs peak-current-mode control with fixed-frequency forced PWM operation, enabling stable regulation under transient load steps and monotonic startup into prebiased outputs. Its dual LDO architecture (IN-LDO and EXT-LDO) dynamically selects VCC supply based on EXTVCC voltage, reducing on-chip dissipation when powered from ≥5V external bias.
It integrates high-side (330–620mΩ) and low-side (170–320mΩ) nMOSFETs, supports external clock synchronization via RT/SYNC with 1.1×–1.4× capture range, and implements cycle-by-cycle current limiting (2.79A typical peak), runaway current detection (3.09A), and thermal shutdown at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - enables direct connection to 12V, 24V, 36V, 48V industrial bus rails without pre-regulation. |
| Output Current | Up to 1.5A continuous - sufficient for powering FPGAs, microcontrollers, sensors, and analog front-ends in embedded systems. |
| Feedback Accuracy | ±1.2% over –40°C to +125°C - ensures stable output regulation across full industrial temperature range without calibration. |
| Switching Frequency | 400kHz to 2.2MHz (adjustable via RT/SYNC resistor or external clock) - allows optimization of size vs. EMI in space-constrained designs. |
| Shutdown Current | 4.65μA - minimizes system standby power in battery-backed or energy-sensitive applications. |
| Efficiency | 94% peak - reduces thermal load and improves power density in enclosed or convection-cooled enclosures. |
| Package | 12-pin TDFN-EP (3mm × 3mm) with exposed pad - provides low thermal resistance (θJA = 41°C/W) for reliable high-power operation. |
Pinout & Package
MAX17571ATC+ is housed in a 12-pin thermally enhanced thin dual flat no-lead package (TDFN-EP) measuring 3mm × 3mm, with an exposed pad (EP) that must be soldered to SGND and connected to a large ground plane using multiple thermal vias for optimal junction-to-board heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 4V–60V unregulated input; connects directly to bulk input capacitor and upstream supply. |
| EN/UVLO | Enable and input undervoltage lockout | Configurable turn-on threshold (1.215V rising); enables controlled power sequencing and brownout protection. |
| RESET | Open-drain output voltage monitor | Asserts low when FB falls below 92% of setpoint; deasserts after 1024 cycles once FB rises above 95% - provides reliable POR and fault signaling. |
| SS | Soft-start timing control | Capacitor-connected node sets ramp time; prevents input inrush and ensures monotonic startup into prebiased outputs. |
| VCC | Internal 5V LDO output | Supplies internal logic and low-side gate driver; requires 2.2μF ceramic bypass to SGND. |
| RT/SYNC | Frequency programming & sync input | Resistor sets fSW (400kHz–2.2MHz); accepts external clock for system-level timing coherence. |
| FB | Feedback voltage sense | Monitors resistive divider output; regulates VOUT with ±1.2% accuracy across temperature and line/load. |
| SGND | Signal ground reference | Reference point for FB, SS, EN/UVLO, RESET, RT/SYNC; must be star-connected to PGND near VCC capacitor. |
| EXTVCC | External bias input | Bypasses internal IN-LDO when ≥4.7V applied; improves efficiency at high VIN by reducing chip dissipation. |
| BST | Bootstrap capacitor connection | Connects 0.1μF ceramic capacitor to LX; supplies gate drive voltage for high-side MOSFET. |
| LX | Switching node | Drives external inductor; carries high di/dt pulsed current - requires short, wide trace and tight layout to PGND. |
| PGND | Power ground return | High-current return path for LX and internal MOSFETs; must be low-inductance plane tied to SGND at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves light-load efficiency. |
| Internal compensation | Removes need for external Type-II/III compensation network - simplifies design, saves board area, and improves stability margin. |
| All-ceramic capacitor support | Enables compact, low-profile layouts using X7R/X5R MLCCs - avoids electrolytic aging and improves reliability in harsh environments. |
| Hiccup-mode overload protection | Shuts down during sustained overcurrent or short-circuit, then auto-retries after 32,768 cycles - limits power dissipation and prevents thermal runaway. |
| CISPR 32 Class B compliance | Meets radiated/conducted EMI limits for industrial equipment without additional filtering - accelerates EMC certification. |
| Prebiased output startup | Prevents reverse current flow during hot-plug or backup-supply scenarios - protects downstream circuitry and maintains system integrity. |
Applications
| Industrial PLC I/O Modules | Factory Automation Sensors |
|---|---|
Use Scenario: Powering isolated analog input/output channels, digital I/O drivers, and communication interfaces (RS-485, CAN) in programmable logic controllers. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC regulator converting 24V rail to 3.3V/5V for microcontroller, ADC, and transceiver ICs. Use Value: Wide 4V–60V input accommodates brownout and surge conditions common in factory wiring; ±1.2% regulation ensures sensor measurement accuracy. |
Use Scenario: Supplying precision analog front-ends, MEMS accelerometers, and wireless transceivers in smart condition-monitoring nodes. IC Role / Device Role / Timing Role: Point-of-load regulator generating stable 3.3V from variable 12V–48V battery or PoE-derived input. Use Value: 94% peak efficiency and 4.65μA shutdown current extend battery life; hiccup mode prevents damage during field-wiring faults. |
| Ruggedized Edge Computing | Distributed Power Architecture |
Use Scenario: Providing clean, regulated 5V/3.3V rails for fanless edge AI gateways deployed in transportation or outdoor enclosures. IC Role / Device Role / Timing Role: High-reliability buck converter operating continuously at –40°C to +125°C ambient with minimal derating. Use Value: Thermal shutdown (165°C) and robust overcurrent protection ensure safe operation under airflow restriction or dust accumulation. |
Use Scenario: Local regulation of intermediate bus voltages (e.g., 12V or 24V) to generate sub-rails for FPGA banks, memory, and peripherals. IC Role / Device Role / Timing Role: Compact, high-efficiency POL converter replacing discrete solutions in multi-rail power systems. Use Value: 3mm × 3mm TDFN-EP package and all-ceramic design enable dense, low-profile power delivery with fast transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A output, 1.5MHz max fSW, no EXTVCC pin, lower peak efficiency (92%), AEC-Q100 qualified | Targeted at automotive infotainment and ADAS; lacks hiccup-mode reset assertion and prebias startup | Choose for automotive-grade qualification where 1A output suffices and EXTVCC optimization is not required. |
| MPQ4420AGL-A-Z | 3.3V–60V input, 2A output, 1.2MHz fixed fSW, no RT/SYNC sync, no RESET output, no EXTVCC, ±2% FB accuracy | Cost-optimized for consumer/industrial SMPS; missing critical monitoring and sequencing features | Choose only if higher output current is mandatory and RESET, soft-start adjustability, and tight regulation are noncritical. |
Compared with LM5164QPWPRQ1 and MPQ4420AGL-A-Z, the MAX17571ATC+ delivers superior thermal resilience (125°C ambient rating), tighter feedback accuracy (±1.2% vs. ±2%), and integrated system-level features (RESET, EXTVCC bias, hiccup mode) essential for mission-critical industrial power design.
Availability
MAX17571ATC+ is available at Aetrix Electronics and suitable for industrial PLCs, factory automation sensors, ruggedized edge computing gateways, and distributed power architecture subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX17571ATC+ 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and connectivity solutions.
The MAX17571ATC+ belongs to ADI's Himalaya power portfolio, designed specifically for compact, high-efficiency, and thermally robust DC-DC conversion in harsh industrial environments where reliability, wide input range, and integrated protection are mandatory.
FAQ
What is the maximum output current capability of the MAX17571ATC+?
The MAX17571ATC+ delivers up to 1.5A continuous output current under specified thermal conditions. This rating assumes proper PCB layout with thermal vias to the exposed pad, adequate copper area for heat dissipation, and operation within the 4V–60V input range. Peak current limit is 2.79A (typical), and runaway current threshold is 3.09A - both triggering hiccup-mode protection to safeguard the device during overload.
Does the MAX17571ATC+ require external compensation components?
No, the MAX17571ATC+ features internal compensation across its full output voltage and switching frequency ranges. This eliminates the need for external Type-II or Type-III compensation networks, reducing bill-of-materials count, saving PCB area, and improving design robustness against component tolerances and temperature drift - a key differentiator versus many competing controllers.
How does the EXTVCC pin improve efficiency in the MAX17571ATC+?
The EXTVCC pin on the MAX17571ATC+ allows external biasing of the internal 5V LDO (VCC) from the output rail (5V–24V), bypassing the IN-LDO powered from VIN. This reduces on-chip power dissipation - especially beneficial at high input voltages (e.g., 48V) - resulting in measurable efficiency gains and lower junction temperature. The switchover occurs automatically at 4.7V (rising).
Can the MAX17571ATC+ start up into a prebiased output voltage?
Yes, the MAX17571ATC+ supports monotonic startup into a prebiased output. During initial power-up, both high-side and low-side MOSFETs remain off until the internal PWM comparator commands the first pulse, preventing reverse current flow from the output into the converter. This protects downstream circuitry in hot-swap, redundant supply, or battery-backup configurations.
What protection features are integrated into the MAX17571ATC+?
The MAX17571ATC+ integrates comprehensive protection: cycle-by-cycle peak current limiting (2.79A), runaway current detection (3.09A), hiccup-mode overload recovery, thermal shutdown at 165°C (10°C hysteresis), output voltage monitoring with open-drain RESET output, adjustable EN/UVLO, and minimum on/off time constraints to prevent subharmonic oscillation - all implemented without external components.
MAX17571ATC+ 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):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 54V
- Current - Output:
- 1.5A
- 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)
MAX17571ATC+ FAQ
1.How can I place an order for MAX17571ATC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17571ATC+ 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 MAX17571ATC+ reliable?
The price and inventory of MAX17571ATC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17571ATC+ is usually 5 days.
3.What payment methods are accepted for MAX17571ATC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17571ATC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17571ATC+?
MAX17571ATC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17571ATC+ 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 MAX17571ATC+?
For technical support, including MAX17571ATC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17571ATC+ requirements.
6.How does Aetrix verify that MAX17571ATC+ is sourced from the original manufacturer or authorized distributors?
All MAX17571ATC+ 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 MAX17571ATC+ meets industry standards.
7.What is the process for return or replacement of MAX17571ATC+?
All MAX17571ATC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17571ATC+, 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 MAX17571ATC+ part is unused and in its original packaging.
Return procedure for MAX17571ATC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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