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Analog Devices Inc./Maxim Integrated MAX17574ATG+
- Part No.:
- MAX17574ATG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX17574ATG+.pdf
- Description:
- IC REG BUCK ADJ 3A 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,340
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Product details
Overview
MAX17574ATG+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated high-side and low-side nMOSFETs, operating from 4.5V to 60V input and delivering up to 3A output current. It features peak-current-mode control, ±0.9% feedback regulation accuracy over –40°C to +125°C, and programmable switching frequency from 100kHz to 2.2MHz. It is used in industrial control power supplies where wide-input, high-reliability, and prebiased startup are required.
For engineers reviewing the MAX17574ATG+ datasheet, MAX17574ATG+ pinout, MAX17574ATG+ application, or MAX17574ATG+ equivalent, key selection considerations include its 24-pin TQFN package, EN/UVLO programmability, open-drain RESET with 95% FB threshold deassertion, internal compensation enabling all-ceramic capacitor designs, and support for PWM/DCM/PFM mode selection via MODE/SYNC pin.
Technical Context
The MAX17574ATG+ implements a peak-current-mode controller with slope compensation, supporting three distinct operating modes: constant-frequency PWM (MODE/SYNC = SGND), discontinuous-conduction mode DCM (MODE/SYNC = VCC), and pulse-frequency modulation PFM (MODE/SYNC = open). Its internal 5V VCC LDO can be powered either from VIN or an external 4.84V–24V EXTVCC supply, improving efficiency at high input voltages.
It integrates protection features including hiccup-mode overload response triggered at VFB < 0.58V, thermal shutdown at 165°C with 10°C hysteresis, monotonic startup into prebiased loads, and adjustable soft-start via external capacitor on SS pin. The device achieves >90% peak efficiency and maintains ±0.9% output regulation across full temperature range using internal voltage reference and error amplifier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports direct connection to 24V/48V industrial rails and wall adapters without pre-regulation. |
| Output Current | Up to 3A continuous - delivers full rated load across –40°C to +125°C ambient with thermal derating. |
| Feedback Accuracy | ±0.9% over –40°C to +125°C - ensures stable output voltage under industrial temperature extremes. |
| Switching Frequency | 100kHz to 2.2MHz, adjustable via RT resistor - enables EMI optimization and inductor size reduction. |
| Efficiency | >90% peak - achieved via synchronous rectification, auxiliary bootstrap LDO, and low RDS-ON MOSFETs (100mΩ HS / 64mΩ LS). |
| Shutdown Current | 2.8µA - minimizes system standby power loss in battery-backed or energy-sensitive applications. |
| Operating Temp | –40°C to +125°C ambient / +150°C junction - qualified for harsh industrial and base station environments. |
Pinout & Package
MAX17574ATG+ is housed in a 24-pin, 4mm × 5mm TQFN package with exposed pad (EP) for thermal management. Pin 1 is located at top-left per standard orientation; EP must be soldered to SGND with multiple thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX (Pins 1, 23, 24) | Switching node | Connects directly to inductor switch node; carries high di/dt current; requires short, low-inductance routing. |
| PGND (Pins 2, 3, 11) | Power ground | High-current return path for MOSFETs and LX; must connect to dedicated power ground plane, separate from SGND except at VCC bypass cap. |
| VIN (Pins 5–7, 9) | Main input supply | Accepts 4.5V–60V; multiple pins reduce IR drop and improve thermal distribution; requires local ceramic input capacitance. |
| EN/UVLO (Pin 10) | Enable & input UVLO | Configurable turn-on threshold (1.215V rising); enables precise power sequencing and brownout protection. |
| RESET (Pin 14) | Open-drain power-good | Asserts low when FB < 92% of set point; deasserts after 1024 cycles once FB > 95%; requires external pull-up. |
| MODE/SYNC (Pin 15) | Mode selection & sync input | Determines PWM/DCM/PFM operation at startup; accepts external clock (1.1–1.4× fSW) for EMI synchronization. |
| SS (Pin 16) | Soft-start timing | Capacitor-to-SGND sets ramp time; prevents input inrush and output overshoot during startup. |
| FB (Pin 18) | Feedback input | Monitors output via resistor divider; regulates output from 0.9V to 90% VIN with internal 0.9V reference. |
| RT (Pin 19) | Frequency setting | Resistor-to-SGND programs fSW from 100kHz to 2.2MHz; open circuit defaults to 500kHz. |
| EXTVCC (Pin 20) | External VCC supply | Bypasses internal VIN-powered LDO when supplied 4.84V–24V; improves efficiency at high VIN. |
| SGND (Pin 21) | Analog ground | Reference for FB, SS, CF, MODE/SYNC, RESET; must tie to PGND only at VCC bypass capacitor location. |
| BST (Pin 22) | Bootstrap supply | Connects 0.1µF ceramic capacitor to LX; powers high-side gate driver; critical for MOSFET turn-on robustness. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network - simplifies design and guarantees stability across all output voltages and ceramic capacitors. |
| Synchronous MOSFETs | Integrated 100mΩ high-side and 64mΩ low-side nMOSFETs - removes external Schottky diode, reduces conduction loss, and improves light-load efficiency. |
| Three-mode operation | PWM (constant frequency), DCM (no negative current), PFM (pulse skipping) - allows dynamic trade-off between efficiency, ripple, and EMI based on load condition. |
| Prebiased startup | Monotonic output rise into precharged output capacitor - prevents reverse current flow and ensures safe power-up in distributed systems. |
| Hiccup-mode protection | Auto-retry current limiting triggered at VFB < 0.58V - protects against sustained overload or short-circuit without thermal runaway. |
| Adjustable EN/UVLO | Programmable turn-on threshold (1.215V) with hysteresis - enables precise input voltage sequencing and brownout recovery in multi-rail systems. |
Applications
| Industrial Control Power Supplies | Base Station Power Supplies |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and fieldbus interfaces in factory automation cabinets with 24V/48V DC rails. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting unregulated 48V bus to 3.3V/5V logic rails with hiccup-mode fault containment. Use Value: Wide 4.5V–60V input accommodates rail sag and surge; ±0.9% regulation ensures sensor ADC reference stability; -40°C to +125°C rating matches enclosure thermal profile. |
Use Scenario: Generating intermediate 5V/12V rails from 48V telecom rectifier output in 4G/5G remote radio units (RRUs). IC Role / Device Role / Timing Role: Point-of-load converter supplying FPGA, transceiver, and RF front-end ICs with fast transient response and RESET signaling. Use Value: 3A output sustains burst transmit loads; open-drain RESET provides sequenced power-good to FPGA configuration logic; EXTVCC option improves efficiency at 48V input. |
| High-Voltage, Single-Board Systems | Wall Transformer Regulation |
Use Scenario: Compact embedded controllers integrating MCU, Ethernet PHY, and analog sensing on single PCB powered by 36V–60V PoE++ or industrial SMPS. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V/5V from high-voltage input; handles prebiased startup during hot-swap events. Use Value: Monotonic startup prevents latch-up on precharged rails; TQFN-24 package enables dense layout; internal compensation reduces BOM count and layout sensitivity. |
Use Scenario: Replacing linear regulators or discrete buck solutions in AC/DC adapter secondary-side regulation for IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Efficient 3.3V/5V generation from 12V–24V DC output of off-line transformer, replacing inefficient 78xx linear regulators. Use Value: >90% peak efficiency reduces heat sink requirements; 2.8µA shutdown current extends standby battery life; all-ceramic capacitor support lowers solution height and cost. |
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, 350mA output, no integrated low-side FET - requires external MOSFET; lower current capability. | Targeted at automotive 12V/24V systems with AEC-Q100 qualification; lacks hiccup-mode protection and prebiased startup. | Select LM5164QPWPRQ1 only for automotive-qualified designs needing lower cost and smaller footprint at sub-1A loads. |
| TPS54360DGQR | 3.5V–60V input, 3.5A output, external compensation required - needs type-II/III network; higher quiescent current (146µA vs. 61µA in PFM). | Optimized for high-transient industrial systems; includes adjustable soft-start but no built-in RESET output or EXTVCC option. | Choose TPS54360DGQR when external compensation flexibility is needed and RESET signaling is implemented separately. |
Compared with LM5164QPWPRQ1 and TPS54360DGQR, MAX17574ATG+ uniquely combines 3A integrated power stage, internal compensation, open-drain RESET, and EXTVCC efficiency boost - reducing total component count and simplifying design for industrial 48V point-of-load applications.
Availability
MAX17574ATG+ is available at Aetrix Electronics and suitable for industrial control power supplies, base station power supplies, and high-voltage single-board systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17574ATG+ 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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications with emphasis on reliability, integration, and power efficiency.
The MAX17574ATG+ belongs to Maxim's high-voltage DC-DC converter product line, engineered for rugged industrial environments where wide-input operation, thermal resilience, and functional safety features like hiccup-mode protection and monotonic startup are essential.
FAQ
What is the maximum output current capability of the MAX17574ATG+ across temperature?
The MAX17574ATG+ delivers up to 3A continuous output current over the full –40°C to +125°C ambient operating temperature range. This rating accounts for thermal derating on a multilayer PCB with θJA = 24°C/W; actual achievable current depends on layout, airflow, and input/output voltage conditions. Peak current limit is 5.25A, supporting transient load demands beyond steady-state rating.
Does the MAX17574ATG+ require external compensation components?
No, the MAX17574ATG+ features internal compensation that eliminates the need for external type-II or type-III compensation networks. This allows stable operation across the full output voltage range (0.9V to 90% VIN) using only all-ceramic output capacitors, significantly simplifying design and reducing bill-of-materials cost and PCB area.
How does the EN/UVLO pin function on the MAX17574ATG+?
The EN/UVLO pin on the MAX17574ATG+ serves dual functions: it enables the device when driven above 1.215V (rising threshold) and provides undervoltage lockout with hysteresis (falling threshold 1.09V). Connecting it to a resistor divider from VIN to SGND sets the precise turn-on voltage, enabling controlled power sequencing in multi-rail systems.
Can the MAX17574ATG+ operate with a prebiased output voltage?
Yes, the MAX17574ATG+ supports monotonic startup into prebiased loads - a critical feature for hot-swap and redundant power systems. During startup, the device prevents reverse current flow and ensures the output voltage ramps monotonically from the prebias level to the regulated setpoint without undershoot or oscillation.
What protection features are integrated into the MAX17574ATG+?
The MAX17574ATG+ integrates hiccup-mode overload protection (triggered at VFB < 0.58V), thermal shutdown at 165°C with 10°C hysteresis, overvoltage protection via FB monitoring, and valley-current limiting. These features collectively prevent damage during short-circuit, overtemperature, or excessive load conditions without requiring external circuitry.
MAX17574ATG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-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):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 54V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x5)
MAX17574ATG+ FAQ
1.How can I place an order for MAX17574ATG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17574ATG+ 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 MAX17574ATG+ reliable?
The price and inventory of MAX17574ATG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17574ATG+ is usually 5 days.
3.What payment methods are accepted for MAX17574ATG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17574ATG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17574ATG+?
MAX17574ATG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17574ATG+ 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 MAX17574ATG+?
For technical support, including MAX17574ATG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17574ATG+ requirements.
6.How does Aetrix verify that MAX17574ATG+ is sourced from the original manufacturer or authorized distributors?
All MAX17574ATG+ 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 MAX17574ATG+ meets industry standards.
7.What is the process for return or replacement of MAX17574ATG+?
All MAX17574ATG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17574ATG+, 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 MAX17574ATG+ part is unused and in its original packaging.
Return procedure for MAX17574ATG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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