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Analog Devices Inc./Maxim Integrated MAX17693AATC+
- Part No.:
- MAX17693AATC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17693AATC+.pdf
- Description:
- IC REG FLYBACK ADJ 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:839
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Product details
Overview
MAX17693AATC+ from Maxim Integrated is a 4.2V–60V input, no-opto isolated flyback converter IC with integrated 76V/245mΩ nMOSFET, fixed-frequency peak-current-mode control, and primary-side output voltage regulation. It delivers up to 1.4W output power, supports programmable 100–350kHz switching, and enables compact industrial power supplies for PLC I/O modules and IGBT gate drives.
For engineers reviewing the MAX17693AATC+ datasheet, MAX17693AATC+ pinout, MAX17693AATC+ application, or MAX17693AATC+ equivalent, key selection considerations include its internal loop compensation, OVI protection (MAX17693A only), temperature-compensated diode sensing, hiccup-mode overcurrent protection, and 3mm × 3mm TDFN-EP package with exposed pad thermal management.
Technical Context
The MAX17693AATC+ implements primary-side regulation by sampling the reflected flyback waveform at the LX node during secondary diode conduction, eliminating optocoupler and secondary error amplifier. Its internal 0.988V–1.012V SET reference and differential FB sensing enable accurate output voltage tracking without isolation boundary components.
It uses fixed-frequency peak-current-mode control with programmable RT resistor setting, supports external clock synchronization via SYNC/DITHER pin, and integrates frequency dithering (±4% to ±12%) for EMI reduction. Internal thermal shutdown (160°C) and hiccup-mode current limiting (16384-cycle timeout) ensure robust operation in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 60V - supports wide industrial input rails including 24V, 36V, and 48V systems without external pre-regulation. |
| Integrated FET | 76V VDSS, 245mΩ RDS(ON) - eliminates external high-voltage switch, reduces BOM count and layout complexity. |
| Switching Frequency | 100kHz to 350kHz (programmable via RT) - balances efficiency, transformer size, and EMI filtering requirements. |
| OVI Protection | Programmable 1.19V–1.24V rising threshold - enables precise input overvoltage shutdown without external comparator circuitry. |
| Soft-Start Time | Default 5ms (typ), programmable via SS capacitor - limits inrush current into output capacitors during cold start. |
| Operating Temp | −40°C to +125°C ambient - qualified for industrial and telecom environments with full parameter guarantee. |
| Thermal Resistance | θJA = 41°C/W (4-layer board) - enables >1W continuous output power with minimal heatsinking. |
Pinout & Package
MAX17693AATC+ is housed in a 12-pin, 3mm × 3mm TDFN-EP package with exposed thermal pad (package code TD1233+1C). The EP pad must be soldered to primary-side GND with ≥4 thermal vias for reliable thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply rail | 4.2V–60V input connection; also serves as reference for FB resistor divider - must connect ≥1µF ceramic capacitor to GND. |
| GND | Primary-side ground reference | Common return for all internal circuits and EP pad - requires low-inductance connection to PCB ground plane. |
| VCC | LDO output for internal bias | 5.77V regulated output (2.2µF min bypass required); can be overdriven by auxiliary winding to improve efficiency at high VIN. |
| SYNC/DITHER | Multi-function control pin | Configurable for spread-spectrum dithering (capacitor/resistor network) or external clock sync - tie to GND if unused. |
| RT | Frequency programming node | Resistor-to-GND sets fSW (100–350kHz); open-circuit defaults to 200kHz - determines transformer design and EMI filter sizing. |
| TC/VCM | Temperature compensation & common-mode setting | Programs −1 to −2mV/°C diode forward-voltage compensation via RTC/VCM resistor - critical for stable output across temperature. |
| SS | Soft-start timing control | Capacitor-to-GND extends soft-start beyond default 5ms - prevents inrush-induced stress on transformer and output caps. |
| SET | Regulated feedback reference node | 0.988–1.012V internal reference; current through RSET mirrors FB-sensed reflected voltage - core of no-opto regulation algorithm. |
| OVI | Input overvoltage monitor | MAX17693A-specific pin; resistor-divider from VIN sets shutdown threshold - adds fail-safe protection without external ICs. |
| EN/UVLO | Enable and undervoltage lockout | Programmable 1.215V turn-on / 1.1V turn-off threshold - ensures clean startup and brownout recovery in variable-input systems. |
| FB | Primary-side feedback input | Senses reflected flyback voltage at LX during secondary conduction - eliminates need for optocoupler or auxiliary winding. |
| LX | Switching node | Drain of integrated nMOSFET - connects directly to primary winding; requires low-inductance layout and snubber if needed. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto primary-side regulation | Eliminates optocoupler, TL431, and secondary-side feedback components - reduces bill-of-materials by ≥4 parts and saves ~20% PCB area. |
| Internal loop compensation (MAX17693A) | Removes need for external compensation network on COMP pin - simplifies design validation and reduces component count vs. MAX17693B. |
| Programmable input overvoltage protection | OVI pin enables system-level input rail protection with <2µs response - avoids damage from transient surges without external supervisor IC. |
| Temperature-compensated diode sensing | TC/VCM pin adjusts regulation setpoint based on junction temperature - maintains ±1% output accuracy across −40°C to +125°C ambient. |
| Hiccup-mode overcurrent protection | 16384-cycle timeout before restart - limits average power dissipation during sustained overload while preventing thermal runaway. |
Applications
| PLC I/O Module Power | IGBT Gate Drive Supply |
|---|---|
Use Scenario: Isolated 5V/0.25A supply for digital input/output conditioning circuits in programmable logic controllers operating from 18–36V DC rails. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller providing galvanically isolated, ripple-free bias for opto-isolators and level-shifters. Use Value: Enables compact, single-chip isolated power solution with no optocoupler - improves long-term reliability and reduces field failure rates from LED aging. | Use Scenario: 15V/0.1A isolated supply powering high-side and low-side gate drivers in motor inverters with 400V DC bus. IC Role / Device Role / Timing Role: No-opto flyback controller delivering tightly regulated, fast-transient gate bias independent of main inverter switching noise. Use Value: Eliminates gate-drive supply instability caused by optocoupler propagation delay - ensures consistent dead-time control and prevents shoot-through. |
| Industrial Sensor Interface | Telecom Remote PHY Power |
Use Scenario: 3.3V/0.3A isolated power for analog sensor signal conditioning and ADC front-ends in hazardous-area transmitters. IC Role / Device Role / Timing Role: Compact isolated DC-DC converter supplying intrinsically safe, low-noise bias for precision instrumentation amplifiers. Use Value: Achieves <10mVpp output ripple and −40°C to +125°C operation without derating - meets IEC 60079-11 safety standards for energy-limited circuits. | Use Scenario: 12V/0.15A isolated supply for remote PHY devices in fiber-to-the-home (FTTH) nodes powered from centralized 48V PoE-like infrastructure. IC Role / Device Role / Timing Role: High-efficiency flyback controller supporting frequency synchronization to avoid beat frequencies in multi-converter backplanes. Use Value: SYNC/DITHER pin enables deterministic EMI profile across multiple units - simplifies FCC Part 15 Class B compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17693BATC+ | External loop compensation (COMP pin), no OVI function, identical pinout and specs otherwise | Preferred when custom loop response tuning is required or when OVI protection is unnecessary | Select MAX17693BATC+ only if external compensation is needed; MAX17693AATC+ is simpler for most fixed-gain designs. |
| UCC28911DR | Fixed 115kHz frequency, no OVI or dithering, higher RDS(ON) (350mΩ), no TC/VCM temperature compensation | Suitable for cost-sensitive, lower-power (<1W) applications where advanced features are not required | UCC28911DR offers lower unit cost but lacks MAX17693AATC+'s precision regulation, thermal compensation, and EMI flexibility. |
Compared with MAX17693BATC+, the MAX17693AATC+ reduces design time via internal compensation and adds OVI protection; versus UCC28911DR, it delivers tighter output accuracy, wider input range, and superior thermal stability - making it optimal for demanding industrial isolation.
Availability
MAX17693AATC+ is available at Aetrix Electronics and suitable for PLC I/O modules, IGBT gate drive supplies, and industrial sensor interfaces requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX17693AATC+ 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, automotive, communications, and computing applications.
The MAX17693AATC+ belongs to Maxim's Rainier family of isolated power devices, engineered specifically to replace traditional optocoupler-based flyback controllers with smaller, cooler, and more reliable no-opto solutions for industrial power conversion.
FAQ
What is the maximum output power achievable with MAX17693AATC+?
The MAX17693AATC+ delivers up to 1.4W of isolated output power under typical conditions (e.g., 24V input, 5V/0.25A output). Actual output capability depends on transformer design, PCB layout, thermal management, and ambient temperature. With proper 4-layer board layout and thermal vias to the EP pad, continuous 1.2W is reliably achievable across −40°C to +125°C ambient.
Does MAX17693AATC+ require an optocoupler for regulation?
No, the MAX17693AATC+ does not require an optocoupler. It implements primary-side regulation by sampling the reflected flyback voltage at the LX pin during secondary diode conduction. This patented algorithm eliminates the optocoupler, secondary-side error amplifier, and associated compensation components - reducing component count and improving long-term reliability.
How is input overvoltage protection implemented on MAX17693AATC+?
MAX17693AATC+ implements input overvoltage protection via its dedicated OVI pin. A resistor divider from VIN to GND sets the trip threshold between 1.19V and 1.24V (rising). When exceeded, the device stops switching within 2µs and resumes only after the OVI pin voltage falls below 1.1V. This feature is exclusive to the MAX17693A variant and is not present in MAX17693B.
Can MAX17693AATC+ synchronize its switching frequency to an external clock?
Yes, MAX17693AATC+ supports external clock synchronization via the SYNC/DITHER pin. An external clock signal (1.10× to 1.32× the nominal fSW) applied to this pin synchronizes the internal oscillator on the 10th or 11th rising edge. This avoids low-frequency beat interference in multi-converter systems and enables deterministic EMI profiling for regulatory compliance.
What is the purpose of the TC/VCM pin on MAX17693AATC+?
The TC/VCM pin on MAX17693AATC+ serves two functions: it selects the internal common-mode voltage range for analog blocks and enables temperature compensation for the output rectifier diode's forward voltage drop. By connecting a resistor (RTC/VCM) to this pin, designers program a −1mV/°C to −2mV/°C compensation slope, maintaining output voltage accuracy across temperature without secondary-side sensing.
MAX17693AATC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.215V
- Voltage - Output (Max):
- 40.8V
- Current - Output:
- -
- Frequency - Switching:
- 100kHz ~ 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX17693AATC+ FAQ
1.How can I place an order for MAX17693AATC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17693AATC+ 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 MAX17693AATC+ reliable?
The price and inventory of MAX17693AATC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17693AATC+ is usually 5 days.
3.What payment methods are accepted for MAX17693AATC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17693AATC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17693AATC+?
MAX17693AATC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17693AATC+ 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 MAX17693AATC+?
For technical support, including MAX17693AATC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17693AATC+ requirements.
6.How does Aetrix verify that MAX17693AATC+ is sourced from the original manufacturer or authorized distributors?
All MAX17693AATC+ 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 MAX17693AATC+ meets industry standards.
7.What is the process for return or replacement of MAX17693AATC+?
All MAX17693AATC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17693AATC+, 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 MAX17693AATC+ part is unused and in its original packaging.
Return procedure for MAX17693AATC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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