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Analog Devices Inc./Maxim Integrated MAX17574ATG+T
- Part No.:
- MAX17574ATG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX17574ATG+T.pdf
- Description:
- IC REG BUCK ADJ 3A 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
MAX17574ATG+T 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 point-of-load conversion is required.
For engineers reviewing the MAX17574ATG+T datasheet, MAX17574ATG+T pinout, MAX17574ATG+T application, or MAX17574ATG+T equivalent, key selection considerations include its 24-pin TQFN (4mm × 5mm) package, EN/UVLO threshold programmability (1.215V typ), open-drain RESET with 95% FB deassertion, and support for PWM/PFM/DCM mode selection via MODE/SYNC pin.
Technical Context
The MAX17574ATG+T implements a peak-current-mode controller with internal compensation, eliminating external loop components across all output voltages. Its architecture supports three distinct operating modes-PWM (constant-frequency, negative inductor current allowed), PFM (pulse-skipping, ultra-low quiescent current of 61µA), and DCM (constant-frequency light-load operation without pulse skipping)-each selected at power-up via the latched MODE/SYNC pin state.
It integrates dual LDOs (VIN-powered and EXTVCC-powered) with seamless switchover at ~4.7V, enabling efficiency optimization at high VIN. The device includes monotonic startup into prebiased loads, hiccup-mode overload protection, and thermal shutdown at 165°C with 10°C hysteresis-features critical for unattended industrial systems operating across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports direct connection to 24V/48V industrial rails and battery stacks without pre-regulation. |
| Output Current | Up to 3A continuous - rated over full –40°C to +125°C ambient, with internal MOSFETs (RDS-ONH = 200mΩ max, RDS-ONL = 125mΩ max). |
| Feedback Accuracy | ±0.9% from –40°C to +125°C - ensures stable output regulation under extreme temperature cycling in factory automation. |
| Switching Frequency | 100kHz–2.2MHz, adjustable via RT resistor - enables EMI optimization and inductor size reduction while maintaining >90% peak efficiency. |
| Shutdown Current | 2.8µA typical - minimizes system standby power in always-on industrial controllers. |
| RESET Threshold | Asserts when FB falls below 92% of set value; deasserts after 1024 cycles once FB rises above 95% - provides clean, glitch-free power-good signaling for FPGA/CPU sequencing. |
| EN/UVLO Threshold | Rising: 1.215V typ; falling: 1.09V typ - allows precise turn-on voltage setting via resistor divider from VIN, supporting brown-out immunity. |
Pinout & Package
MAX17574ATG+T is housed in a 24-pin, 4mm × 5mm, 0.5mm pitch TQFN package with exposed thermal pad (EP) that must be connected to SGND. The package supports high-power density layouts with low thermal resistance (θJA = 24°C/W on multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 23, 24 | LX | Switching node - connects directly to inductor; carries high di/dt current; requires short, low-inductance routing. |
| 2, 3, 11 | PGND | Power ground - return path for high-current MOSFET switching; must be tied to SGND only at VCC bypass capacitor location. |
| 5–7, 9 | VIN | Main input supply - accepts 4.5V–60V; multiple pins reduce IR drop and improve thermal spreading. |
| 10 | EN/UVLO | Enable and input undervoltage lockout - logic-high enables regulator; resistor-divider sets precise turn-on voltage. |
| 12 | VCC | 5V internal LDO output - powers internal circuitry and low-side gate driver; requires 2.2µF ceramic bypass to SGND. |
| 14 | RESET | Open-drain power-good - pulled low during fault or undervoltage; requires external pull-up for system reset assertion. |
| 15 | MODE/SYNC | Mode selection and external clock sync - latched at startup to select PWM/DCM/PFM; accepts 1.1–1.4× fSW external clock. |
| 16 | SS | Soft-start timing - capacitor to SGND sets ramp time, limiting inrush current during power-up. |
| 18 | FB | Feedback input - connects to resistor divider from output; regulates output voltage with 0.9V reference. |
| 19 | RT | Frequency programming - resistor to SGND sets switching frequency from 100kHz to 2.2MHz. |
| 20 | EXTVCC | External LDO input - bypasses VIN-powered LDO when ≥4.7V applied, improving efficiency at high VIN. |
| 21 | SGND | Analog ground - reference for FB, SS, CF, MODE/SYNC; must be separated from PGND except at single-point VCC bypass. |
| 22 | BST | Bootstrap capacitor node - connects 0.1µF ceramic capacitor to LX to drive high-side MOSFET gate. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification with integrated MOSFETs | Eliminates need for external Schottky diode, reducing BOM count and PCB area while enabling >90% peak efficiency. |
| Internal compensation network | Enables stable loop response across full output voltage range (0.9V to 90% VIN) without external compensation components. |
| Three selectable operating modes (PWM/PFM/DCM) | Allows trade-off between light-load efficiency (PFM: 61µA IQ), EMI control (PWM), and transient response (DCM), all configured at startup. |
| Monotonic startup into prebiased output | Prevents output voltage overshoot when powering circuits with charged output capacitors-critical for hot-swap and redundant supply designs. |
| Hiccup-mode overload protection | Shuts down and auto-retries on sustained overcurrent, preventing thermal runaway during short-circuit faults in inaccessible equipment. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and sensor interfaces in factory automation cabinets with 24V/48V DC distribution rails. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 48V bus to 3.3V/5V/12V for microcontrollers, ADCs, and digital isolators. Use Value: Wide 4.5V–60V input handles rail transients and brownouts; –40°C to +125°C rating ensures reliability in uncooled enclosures. | Use Scenario: Local voltage regulation on dense PCBs for FPGAs, SoCs, and high-speed SerDes in test equipment and edge AI gateways. IC Role / Device Role / Timing Role: Efficient, compact step-down converter delivering 3A at 1.2V or 1.8V with minimal external components. Use Value: Internal compensation and all-ceramic capacitor support enable <10mm² layout; 2.2MHz option reduces inductor size for space-constrained designs. |
| Distributed Supply Regulation | Base Station Power Supplies |
Use Scenario: Secondary regulation stage in telecom remote radio units (RRUs), stepping down intermediate 12V/24V bus to processor core voltages. IC Role / Device Role / Timing Role: High-efficiency POL converter with PFM mode for low-idle power in always-on wireless infrastructure. Use Value: 61µA PFM quiescent current extends uptime during low-traffic periods; hiccup protection safeguards against antenna load faults. | Use Scenario: Powering baseband processing boards in 4G/5G macro base stations where input comes from -48V telecom rectifiers. IC Role / Device Role / Timing Role: Robust 60V-input buck converter generating 5V/3.3V for control logic, memory, and interface ICs. Use Value: EN/UVLO programmability ensures clean startup after rectifier recovery; RESET signal sequences FPGA configuration reliably. |
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, 3A, but uses external MOSFETs; no integrated compensation; requires external loop components. | Requires more design effort for stability tuning and layout; better suited for designs needing >3A or custom FET selection. | Select LM5164QPWPRQ1 only if higher current headroom or discrete FET control is needed; MAX17574ATG+T offers faster time-to-market with internal FETs and compensation. |
| TPS54360DGQR | 4.5V–60V input, 3.5A, but fixed 500kHz frequency; no PFM/DCM mode; lower efficiency at light loads (IQ = 146µA vs. 61µA). | Lacks multi-mode efficiency optimization; less suitable for battery-backed or energy-sensitive industrial nodes. | Choose TPS54360DGQR for cost-sensitive, fixed-frequency applications where light-load efficiency is secondary; MAX17574ATG+T delivers superior efficiency flexibility. |
Compared with LM5164QPWPRQ1 and TPS54360DGQR, the MAX17574ATG+T uniquely combines integrated MOSFETs, internal compensation, and three selectable operating modes-enabling smaller footprint, faster design cycle, and adaptive efficiency across varying load profiles in harsh environments.
Availability
MAX17574ATG+T 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 MAX17574ATG+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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX17574ATG+T belongs to Maxim's high-voltage, high-efficiency DC-DC converter product line, designed specifically for ruggedized point-of-load conversion in industrial automation, telecom infrastructure, and transportation systems.
FAQ
What is the absolute maximum input voltage rating for the MAX17574ATG+T?
The MAX17574ATG+T has an absolute maximum VIN-to-PGND rating of +65V. Operation beyond 60V is not recommended, as the device is specified and characterized for reliable performance only up to 60V. Exceeding this may cause permanent damage or degraded lifetime, especially under thermal stress or high ambient conditions.
Can the MAX17574ATG+T operate with a prebiased output during startup?
Yes, the MAX17574ATG+T supports monotonic startup into a prebiased output. Its control architecture prevents reverse current flow and output voltage overshoot when the output capacitor is already charged, making it suitable for hot-swap and redundant power supply applications where seamless voltage transitions are required.
How does the MODE/SYNC pin affect the MAX17574ATG+T's behavior during normal operation?
The MODE/SYNC pin is latched only at power-up and determines the initial operating mode (PWM, PFM, or DCM). Once latched, its state is ignored during normal operation-mode changes require a full power cycle. However, applying an external clock to MODE/SYNC during operation forces immediate transition to synchronized PWM mode, regardless of initial latch state.
What is the purpose of the EXTVCC pin on the MAX17574ATG+T, and how should it be used?
The EXTVCC pin on the MAX17574ATG+T accepts an external 4.84V–24V supply to power the internal 5V LDO, bypassing the VIN-powered LDO and improving efficiency at high input voltages. When unused, EXTVCC must be connected to SGND. If tied to the output rail, a 4.7Ω series resistor is required to limit discharge current during short-circuit events.
Does the MAX17574ATG+T provide output voltage monitoring with built-in fault reporting?
Yes, the MAX17574ATG+T includes dedicated output voltage monitoring via its FB pin and generates a delayed open-drain RESET signal. RESET asserts low when FB falls below 92% of the regulated value and deasserts only after FB remains above 95% for 1024 switching cycles-ensuring robust power-good sequencing without false triggers from transient dips.
MAX17574ATG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN 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:
- 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+T FAQ
1.How can I place an order for MAX17574ATG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17574ATG+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 MAX17574ATG+T reliable?
The price and inventory of MAX17574ATG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17574ATG+T is usually 5 days.
3.What payment methods are accepted for MAX17574ATG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17574ATG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17574ATG+T?
MAX17574ATG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17574ATG+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 MAX17574ATG+T?
For technical support, including MAX17574ATG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17574ATG+T requirements.
6.How does Aetrix verify that MAX17574ATG+T is sourced from the original manufacturer or authorized distributors?
All MAX17574ATG+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 MAX17574ATG+T meets industry standards.
7.What is the process for return or replacement of MAX17574ATG+T?
All MAX17574ATG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17574ATG+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 MAX17574ATG+T part is unused and in its original packaging.
Return procedure for MAX17574ATG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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