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Analog Devices Inc./Maxim Integrated MAX17573ATG+
- Part No.:
- MAX17573ATG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX17573ATG+.pdf
- Description:
- IC REG BUCK ADJ 3.5A 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
MAX17573ATG+ 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 3.5A output current. It features internal loop compensation, adjustable switching frequency (100kHz–2.2MHz), and supports prebiased startup. It is used in industrial power supplies where wide VIN, thermal robustness, and minimal external components are critical.
For engineers reviewing the MAX17573ATG+ datasheet, MAX17573ATG+ pinout, MAX17573ATG+ application, or MAX17573ATG+ equivalent, key selection criteria include input voltage range (4.5V–60V), peak efficiency (95.4% at 12VIN/5VOUT), hiccup-mode overload protection, RESET output with programmable thresholds, and EXTVCC-assisted efficiency optimization.
Technical Context
The MAX17573ATG+ employs peak-current-mode control with an internal transconductance error amplifier and slope compensation. Its PWM/PFM/DCM mode selection is latched at power-up via the MODE/SYNC pin, enabling load-adaptive efficiency without runtime reconfiguration.
It integrates dual nMOS power switches (RDS(on)H = 90mΩ typ, RDS(on)L = 55mΩ typ) and includes built-in linear regulators for VCC (5V ±2.5%) powered either from IN or EXTVCC (4.84V–24V). The device implements programmable EN/UVLO, monotonic soft-start via SS pin, and output-voltage monitoring with 1024-cycle delay on RESET deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports automotive load dump, industrial 24/48V rails, and wide-input PoL designs without external protection. |
| Output Current | 3.5A continuous - enables single-chip conversion for mid-power applications such as PLC I/O modules or sensor hubs. |
| Peak Efficiency | 95.4% at 12VIN/5VOUT/500kHz - reduces thermal load and eliminates need for heatsinks in compact enclosures. |
| Switching Frequency | 100kHz to 2.2MHz (adjustable via RT resistor or external sync) - allows EMI tuning and inductor size optimization across applications. |
| Feedback Regulation Accuracy | ±0.9% over –40°C to +125°C - ensures stable output under extreme ambient conditions without calibration. |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-harvesting systems. |
| Operating Temperature | –40°C to +125°C ambient / +150°C junction - qualified for factory automation, transportation, and harsh-environment deployments. |
Pinout & Package
Package: 24-pin TQFN-EP (4mm × 5mm, exposed pad), RoHS-compliant, θJA = 24°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 23, 24 (LX) | Switching node | Connects directly to inductor; carries high di/dt current; requires low-inductance layout and thermal vias to EP. |
| 2, 3, 11 (PGND) | Power ground | High-current return path for MOSFETs; must be tied to SGND only at VCC bypass capacitor location to avoid noise coupling. |
| 5–7, 9 (IN) | Main input supply | Parallel pins reduce IR drop and thermal stress; require local 4.7μF ceramic decoupling per pair near PGND. |
| 10 (EN/UVLO) | Enable & input UVLO threshold | Resistor-divider programmable turn-on voltage (1.19V–1.26V rising); supports sequenced power-up in multi-rail systems. |
| 14 (RESET) | Open-drain power-good signal | Asserts low when FB falls below 92% of setpoint; deasserts after 1024 cycles once FB rises above 95% - prevents false resets during transient loads. |
| 15 (MODE/SYNC) | Mode selection & clock sync | Configures PFM (open), PWM (GND), or DCM (VCC); accepts external sync clock (1.1×–1.4× fSW) for EMI reduction. |
| 19 (RT) | Frequency programming | Resistor-to-SGND sets fSW; open = 500kHz default; supports precise EMI band placement without crystal. |
| 20 (EXTVCC) | Auxiliary LDO supply | Bypasses internal IN-LDO when ≥4.84V applied - improves efficiency at high VIN by reducing VCC dropout losses. |
| 21 (SGND) | Analog reference ground | Reference for FB, SS, CF, MODE/SYNC; must be isolated from noisy PGND except at single-point VCC capacitor tie. |
| 22 (BST) | Bootstrap supply | Requires 0.1μF ceramic capacitor to LX; sustains gate drive for high-side MOSFET during continuous conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internal loop compensation | Eliminates external compensation network (Type II/III), reducing BOM count and layout sensitivity while maintaining stability across 0.9V–0.9×VIN output range. |
| All-ceramic capacitor support | Enables compact, low-profile designs using only MLCCs for input, output, and bootstrap - no electrolytics or tantalums required. |
| Hiccup-mode overload protection | Shuts down and auto-retries on sustained overcurrent, preventing thermal runaway during short-circuit or overload events without latch-off. |
| Programmable soft-start (SS) | Capacitor-controlled ramp time prevents input inrush current and output overshoot - critical for powering FPGAs, ADCs, or processors with tight voltage tolerances. |
| Prebiased output startup | Allows safe startup into precharged output capacitors - avoids reverse current flow and potential damage in hot-swap or redundant supply configurations. |
| Built-in output voltage monitoring (RESET) | Provides system-level power-good signaling with hysteresis (92%–95%) and fixed 1024-cycle delay - simplifies host MCU reset sequencing without external supervisors. |
Applications
| Factory Automation Power Supply | Aftermarket Automotive Mobile PLC |
|---|---|
|
Use Scenario: Powering I/O modules, sensors, and microcontrollers in programmable logic controllers deployed on factory floors with ambient temperatures up to +70°C and exposure to EMI from motors and VFDs. IC Role / Device Role / Timing Role: Primary 24V-to-5V/3.3V point-of-load regulator with integrated FETs and thermal shutdown - replaces discrete buck controller + external MOSFETs. Use Value: 95.4% peak efficiency and –40°C to +125°C operation minimize heat buildup and eliminate derating in enclosed cabinets; hiccup protection ensures uptime during cable shorts. |
Use Scenario: Compact DC-DC stage in mobile diagnostic tools or telematics units installed in vehicles subject to load dump (up to 60V transient) and wide temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust 48V-to-5V/3.3V regulator with 60V absolute max input rating and EXTVCC efficiency boost - handles ISO 7637-2 pulse 5a without external TVS. Use Value: Integrated 90mΩ/55mΩ MOSFETs and internal compensation reduce solution size by >30% vs. controller-based designs; PFM mode extends battery life during idle periods. |
| Industrial IoT Edge Node | Ruggedized Point-of-Load Converter |
|
Use Scenario: Powering wireless sensor nodes with LoRaWAN or NB-IoT modems that operate intermittently and require <5μA quiescent current during sleep. IC Role / Device Role / Timing Role: Always-on buck regulator with 2.8μA shutdown and programmable EN/UVLO - manages wake-up sequencing and brownout recovery autonomously. Use Value: PFM mode achieves >85% efficiency at 1mA load; SS pin enables controlled wake-up ramp to prevent RF interference during modem transmit bursts. |
Use Scenario: General-purpose 12V/24V-to-3.3V/5V conversion in test equipment, medical monitors, or military comms where reliability and long-term supply continuity are mandatory. IC Role / Device Role / Timing Role: High-VIN synchronous buck with RESET, thermal shutdown, and monotonic startup - serves as drop-in replacement for legacy controllers requiring external FETs. Use Value: Pin-to-pin compatibility with MAX17574 allows upgrade path; improved switching performance yields 0.5% higher efficiency at full load without layout changes. |
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 |
|---|---|---|---|
| MAX17574ATG+ | Same pinout, identical package, but lower peak efficiency (94.9% vs. 95.4% at 12V/5V) and higher RDS(on) (100mΩ/60mΩ vs. 90mΩ/55mΩ). | Acceptable where marginal efficiency loss is acceptable; lacks EXTVCC efficiency boost feature. | Select MAX17574ATG+ only if legacy design reuse or cost sensitivity outweighs efficiency gain and EXTVCC flexibility. |
| LM5164QPWPRQ1 | Automotive-grade (AEC-Q100), 3.5A, 4.5V–65V input, but requires external compensation and lacks integrated RESET output. | Suitable for automotive infotainment or ADAS where qualification is mandatory; not drop-in due to different pinout and missing CF/FB/RESET integration. | Choose LM5164QPWPRQ1 only when AEC-Q100 compliance is required and board redesign is feasible for external compensation and supervisor IC. |
Compared with MAX17574ATG+, the MAX17573ATG+ delivers higher efficiency and EXTVCC support; compared with LM5164QPWPRQ1, it offers smaller footprint, no external compensation, and integrated power-good signaling - making it optimal for space-constrained industrial designs without automotive qualification needs.
Availability
MAX17573ATG+ is available at Aetrix Electronics and suitable for factory automation power supplies, aftermarket automotive mobile PLCs, and ruggedized point-of-load converters requiring stable component supply, long lifecycle assurance, and guaranteed traceability.
Supply support for MAX17573ATG+ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX17573ATG+ belongs to Analog Devices' high-voltage synchronous buck converter product line, designed specifically for reliable, compact, and efficient power conversion in harsh industrial environments where wide input range, thermal resilience, and minimal external components are essential.
FAQ
What is the maximum input voltage rating for the MAX17573ATG+?
The MAX17573ATG+ has an absolute maximum input voltage rating of +65V on the IN pin, with recommended continuous operation from 4.5V to 60V. This allows it to withstand automotive load dump transients per ISO 7637-2 without external clamping, making it suitable for 24V and 48V industrial and vehicle systems where input surges are common. The device's internal protection circuitry remains functional across this full range.
Does the MAX17573ATG+ require external compensation components?
No, the MAX17573ATG+ features fully internal loop compensation - no external resistors or capacitors are needed on the CF or FB pins for standard operation. At switching frequencies ≤300kHz, a capacitor from CF to FB is required; above 300kHz, CF is left open. This eliminates tuning complexity and improves design robustness across varying output voltages and loads.
How does the EXTVCC pin improve efficiency in the MAX17573ATG+?
The EXTVCC pin on the MAX17573ATG+ allows bypassing the internal IN-powered LDO by supplying 4.84V–24V directly, reducing VCC dropout losses - especially beneficial at high input voltages (e.g., 48V). When enabled, EXTVCC powers the internal 5V LDO, cutting quiescent current and boosting full-load efficiency by up to 0.5% versus IN-only operation. A 4.7Ω series resistor protects EXTVCC during output short-circuit events.
Can the MAX17573ATG+ start up into a precharged output capacitor?
Yes, the MAX17573ATG+ supports monotonic, prebiased output startup - meaning it can safely begin regulation even when the output rail is already charged to a voltage near the target. This prevents reverse current flow through the low-side MOSFET and avoids potential damage or system instability in hot-swap, redundant supply, or multi-phase configurations where output capacitance may retain charge.
What protection features are integrated into the MAX17573ATG+?
The MAX17573ATG+ integrates hiccup-mode overcurrent protection, overtemperature shutdown (+165°C trip with 10°C hysteresis), output-voltage monitoring with RESET assertion, programmable EN/UVLO, and minimum on/off-time limits. These features collectively ensure safe operation during faults like short circuits, thermal overload, or input brownout - eliminating the need for external supervisors or current-sense amplifiers in most industrial implementations.
MAX17573ATG+ 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:
- 3.5A
- Frequency - Switching:
- 500kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x5)
MAX17573ATG+ FAQ
1.How can I place an order for MAX17573ATG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17573ATG+ 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 MAX17573ATG+ reliable?
The price and inventory of MAX17573ATG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17573ATG+ is usually 5 days.
3.What payment methods are accepted for MAX17573ATG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17573ATG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17573ATG+?
MAX17573ATG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17573ATG+ 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 MAX17573ATG+?
For technical support, including MAX17573ATG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17573ATG+ requirements.
6.How does Aetrix verify that MAX17573ATG+ is sourced from the original manufacturer or authorized distributors?
All MAX17573ATG+ 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 MAX17573ATG+ meets industry standards.
7.What is the process for return or replacement of MAX17573ATG+?
All MAX17573ATG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17573ATG+, 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 MAX17573ATG+ part is unused and in its original packaging.
Return procedure for MAX17573ATG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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