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Analog Devices Inc./Maxim Integrated MAX17793AFN+
- Part No.:
- MAX17793AFN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-WFQFN Exposed Pad
- Datasheet:
-
MAX17793AFN+.pdf
- Description:
- IC REG BUCK ADJ 3A 18FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:370
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Product details
Overview
MAX17793AFN+ from Analog Devices is a 3V to 80V input, 3A synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, 4mm × 4mm 18-pin FC2QFN package, peak efficiency of 91% at 48VIN/5VOUT, and programmable switching frequency from 300kHz to 1.5MHz - deployed in industrial power supplies for motor control and factory automation.
For engineers reviewing the MAX17793AFN+ datasheet, MAX17793AFN+ pinout, MAX17793AFN+ application, or MAX17793AFN+ equivalent, key selection considerations include its wide VIN range, die temperature monitoring via RESET/TJ pin, EMI-optimized symmetrical IN pins, hiccup-mode overload protection, and dual-mode (PWM/SFM) operation for light-load efficiency optimization.
Technical Context
The MAX17793AFN+ employs peak-current-mode control with internal transconductance error amplifier, slope compensation, and integrated high-side (80–150mΩ) and low-side (40–80mΩ) nMOS switches. It supports forced PWM or SFM mode via MODE/SYNC pin, enabling constant-frequency operation or adaptive frequency reduction at light loads.
Its functional architecture includes dual LDOs (INTVCC and EXTVCC), programmable EN/UVLO threshold (1.25V typ), soft-start via external capacitor, and open-drain RESET/TJ pin supporting either output-voltage monitoring (92–95% FB threshold) or direct die temperature sensing (2mV/°C slope, 25°C reference at 595mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 80V - supports wide industrial bus rails including 24V, 48V, and 72V systems without external pre-regulation. |
| Output Current | Up to 3A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or isolated gate drivers. |
| Switching Frequency | 300kHz to 1.5MHz (programmable via RT resistor) - enables optimization between EMI performance and inductor size. |
| Peak Efficiency | 91% at VIN = 48V, VOUT = 5V - reduces thermal load in enclosed industrial enclosures and extends reliability. |
| Operating Temperature | −40°C to +125°C ambient / −40°C to +150°C junction - qualified for harsh environments including motor drives and avionics. |
| Package | 4mm × 4mm, 18-pin FC2QFN with exposed pad - provides low thermal resistance (θJA ≈ 23.8°C/W) and compact PCB footprint. |
| Protection Features | Hiccup-mode OCP, thermal shutdown (165°C), UVLO on IN/EN/INTVCC/EXTVCC, and prebiased start-up - ensures robust fault recovery without latch-up. |
Pinout & Package
Package: 4mm × 4mm, 18-pin Flip-Chip 2-layer Quad Flat No-lead (FC2QFN) with exposed power pad (EP) internally connected to IN pins (3 and 9). Thermal performance optimized for multilayer PCBs with EP soldered to IN plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor connection | Drives high-side MOSFET gate; requires 0.1µF ceramic cap between BST and LX to sustain gate drive above VIN. |
| LX (Pins 2, 6) | Switching node terminals | Pin 2 connects to bootstrap cap; Pin 6 connects to inductor - dual LX pins reduce parasitic inductance and improve EMI. |
| IN (Pins 3, 9) | Main power input | Two dedicated input pins accept parallel 0.1µF bypass caps near PGND; EP tied directly to IN for low-impedance path. |
| PGND (Pins 4, 5, 7, 8) | Power ground terminals | Four dedicated PGND pins minimize ground bounce and support high di/dt return paths for switching current. |
| EN/UVLO (Pin 10) | Enable and input UVLO control | Resistor-divider programmable turn-on threshold (1.25V typ); pulls low to disable converter or set VIN startup point. |
| RESET/TJ (Pin 16) | Dual-function open-drain status pin | Configurable as output voltage monitor (92–95% FB threshold) or die temperature sensor (2mV/°C, 25°C = 595mV). |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical IN pins with EMI optimization | Reduces common-mode noise and eases compliance with CISPR 32 Class B conducted/radiated emissions limits. |
| Internal compensation network | Eliminates need for external loop compensation components - simplifies design and improves layout robustness. |
| Switching Frequency Modulation (SFM) mode | Automatically reduces switching frequency under light load to boost efficiency while maintaining regulation. |
| External bias input (EXTVCC) | Enables INTVCC to be powered from output rail (2.5V–24V), reducing on-chip dissipation and improving full-load efficiency. |
| All-ceramic capacitor support | Permits use of low-ESR, small-footprint MLCCs for input/output filtering - eliminates bulk electrolytic capacitors. |
Applications
| Industrial Motor Drives | Factory Automation PLCs |
|---|---|
|
Use Scenario: Powering gate drivers and isolated I/O for 3-phase BLDC inverters operating from 48V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 12V/3A to driver stage with fast transient response and hiccup-mode short-circuit protection. Use Value: Integrated MOSFETs and 80V rating eliminate external high-side switch; die temperature monitoring prevents thermal runaway during stall conditions. |
Use Scenario: Generating 5V/3A for microcontroller, Ethernet PHY, and analog sensor interfaces in modular PLC backplanes. IC Role / Device Role / Timing Role: Main system supply with programmable soft-start and RESET output for controlled power sequencing. Use Value: 300kHz–1.5MHz frequency tuning avoids noise coupling into sensitive analog measurement circuits; SFM mode cuts no-load quiescent current to 31µA. |
| Avionics Power Distribution | Heavy Equipment Control Units |
|
Use Scenario: Converting 28V aircraft bus to 3.3V/3A for flight control processors and ARINC 429 interface ICs. IC Role / Device Role / Timing Role: High-reliability buck converter with −40°C to +125°C operation and built-in UVLO hysteresis for brown-out immunity. Use Value: CISPR 32 Class B compliance meets DO-160 Section 21 radiated emissions requirements; RESET/TJ pin enables real-time die temp logging for health monitoring. |
Use Scenario: Supplying 15V/3A to hydraulic valve solenoids and CAN transceivers in off-highway vehicle ECUs. IC Role / Device Role / Timing Role: Ruggedized primary DC-DC stage handling 80V load-dump transients and reverse-polarity protection via external circuitry. Use Value: 85V absolute max IN-to-PGND rating withstands ISO 7637-2 Pulse 5a transients; dual PGND/LX pins suppress ground bounce during solenoid switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A output, SOIC-14 package, no die temp monitor, lower integration (external MOSFETs required) | Targeted at automotive AEC-Q100 Grade 1; lacks SFM mode and RESET/TJ functionality | Choose when automotive qualification is mandatory and 1A output suffices; avoid if >3A or die temp visibility is needed. |
| MPQ4333GQ-A | 3.8V–60V input, 3A output, QFN-16, 500kHz fixed freq, no EXTVCC bias option or hiccup-mode OCP | Cost-optimized industrial solution; lacks EMI-optimized IN pin symmetry and programmable frequency | Choose for cost-sensitive designs where 60V max VIN and fixed 500kHz operation are acceptable; not suitable for 72V+ or EMI-critical layouts. |
Compared with LM5164QPWPRQ1 and MPQ4333GQ-A, the MAX17793AFN+ delivers higher input voltage capability (80V), integrated MOSFETs with lower RDS(on), dual-mode PWM/SFM operation, and unique die temperature monitoring - making it optimal for thermally constrained, high-reliability industrial and avionics power rails.
Availability
MAX17793AFN+ is available at Aetrix Electronics and suitable for industrial motor drives, factory automation PLCs, avionics power distribution, and heavy equipment control units requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX17793AFN+ 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, headquartered in Wilmington, MA, serving industrial, automotive, communications, and healthcare markets.
The MAX17793AFN+ belongs to Analog Devices' high-voltage power management product line, designed specifically for robust, efficient DC-DC conversion in demanding industrial and transportation applications where wide input range, thermal resilience, and EMI compliance are critical.
FAQ
What is the maximum input voltage rating for the MAX17793AFN+?
The MAX17793AFN+ has an absolute maximum input voltage rating of +85V (IN to PGND), with guaranteed operation from 3V to 80V. This allows reliable use in 48V and 72V industrial systems, including those subject to load-dump transients up to 80V. The device incorporates internal protection against overvoltage stress on all pins, including LX-to-PGND AC transients up to VIN + 10V for sub-10ns events.
How does the RESET/TJ pin function in the MAX17793AFN+?
The MAX17793AFN+ RESET/TJ pin serves two mutually exclusive functions: as an open-drain output voltage monitor (asserting low when FB falls below 92% of regulation) or as a die temperature sensor (outputting 595mV at 25°C with 2mV/°C slope). Configuration depends on external circuitry: pull-up resistor for RESET, 20kΩ to SGND for temperature sensing. Both modes require VFB > 95% to activate.
Can the MAX17793AFN+ operate with a prebiased output?
Yes, the MAX17793AFN+ supports prebiased start-up: both high-side and low-side MOSFETs remain off until the SS pin voltage exceeds the FB pin voltage, preventing reverse current flow into a live output rail. Once aligned, VFB ramps smoothly to 0.6V regulation point, ensuring controlled ramp-up without output overshoot or inrush stress on downstream capacitors.
What is the purpose of the EXTVCC pin on the MAX17793AFN+?
The EXTVCC pin on the MAX17793AFN+ allows the internal 1.8V INTVCC LDO to be powered from the converter's output rail (2.5V–24V), rather than from the high-voltage input. This reduces on-chip power dissipation, especially at high VIN, thereby improving full-load efficiency and lowering junction temperature - critical for thermally constrained designs.
Does the MAX17793AFN+ support external clock synchronization?
Yes, the MAX17793AFN+ supports external clock synchronization via the MODE/SYNC pin. An external clock signal between 1.1×fSW and 1.4×fSW (up to 1.5MHz) can be applied to lock the internal oscillator, enabling deterministic switching timing across multiple converters to reduce beat frequencies and simplify EMI filter design in multi-rail systems.
MAX17793AFN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 18-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):
- 3V
- Voltage - Input (Max):
- 80V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 72V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-FC2QFN (4x4)
MAX17793AFN+ FAQ
1.How can I place an order for MAX17793AFN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17793AFN+ 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 MAX17793AFN+ reliable?
The price and inventory of MAX17793AFN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17793AFN+ is usually 5 days.
3.What payment methods are accepted for MAX17793AFN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17793AFN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17793AFN+?
MAX17793AFN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17793AFN+ 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 MAX17793AFN+?
For technical support, including MAX17793AFN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17793AFN+ requirements.
6.How does Aetrix verify that MAX17793AFN+ is sourced from the original manufacturer or authorized distributors?
All MAX17793AFN+ 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 MAX17793AFN+ meets industry standards.
7.What is the process for return or replacement of MAX17793AFN+?
All MAX17793AFN+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17793AFN+, 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 MAX17793AFN+ part is unused and in its original packaging.
Return procedure for MAX17793AFN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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