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Analog Devices Inc./Maxim Integrated MAX17691AATC+T
- Part No.:
- MAX17691AATC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17691AATC+T.pdf
- Description:
- IC REG FLYBACK 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,561
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Product details
Overview
MAX17691AATC+T from Maxim Integrated is a 4.2V–60V no-opto isolated flyback converter with integrated 76V/170mΩ nMOSFET, fixed-frequency peak-current-mode control, and primary-side output voltage regulation. It delivers up to 7.5W output power with >90% efficiency, eliminates optocoupler and secondary-side error amplifier, and targets space-constrained industrial isolated supplies.
For engineers reviewing the MAX17691AATC+T datasheet, MAX17691AATC+T pinout, MAX17691AATC+T application, or MAX17691AATC+T equivalent, key selection considerations include input UVLO/OVI programmability, 100kHz–350kHz programmable switching frequency, internal loop compensation, temperature-compensated diode forward-voltage sensing, and 3mm × 3mm TDFN-EP package thermal performance.
Technical Context
The MAX17691AATC+T implements primary-side regulation by sampling the reflected flyback waveform at the LX pin during secondary rectifier conduction, using an internal differential amplifier to derive IRFB proportional to secondary winding voltage. Its algorithm samples the SET pin voltage near zero secondary current to minimize transformer parasitic and diode VF effects on regulation accuracy.
It integrates a 76V-rated nMOSFET with 170mΩ typical RDS(ON), supports external clock synchronization (1.10×–1.32× fSW), and provides ±4%–±12% frequency dithering via SYNC/DITHER pin. Internal loop compensation (no COMP pin) and EN/UVLO + OVI dual-threshold protection distinguish it from the MAX17691B variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 60V - supports wide industrial DC bus inputs including 24V, 36V, and 48V systems without pre-regulation. |
| Integrated FET | 76V, 170mΩ nMOSFET - enables compact single-chip flyback design; reduces external component count and PCB area. |
| Switching Frequency | 100kHz to 350kHz (programmable via RT resistor) - balances EMI, transformer size, and efficiency; default 200kHz when RT open. |
| Output Power | Up to 7.5W - suitable for low-to-medium power isolated rails in PLC I/O, gate drives, and telecom modules. |
| Efficiency | >90% - achieved via low RDS(ON), optimized gate drive, and frequency fold-back at light load. |
| Shutdown Current | 2.5µA - enables ultra-low-power standby in always-on industrial systems. |
| Operating Temp | −40°C to +125°C ambient - qualified for harsh industrial environments; junction limit +150°C. |
| OVI Protection | Programmable via resistor divider on OVI pin (1.215V rising threshold) - adds input overvoltage fail-safe beyond basic EN/UVLO. |
Pinout & Package
MAX17691AATC+T is housed in a thermally enhanced 12-pin, 3mm × 3mm TDFN-EP package (package code TD1233+1C) with exposed pad connected to primary-side GND for improved thermal dissipation (θJA = 41°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply rail | 4.2V–60V input connection; also serves as reference for FB resistor network; requires ≥1µF ceramic bypass to GND. |
| GND | Primary-side ground reference | System ground return for all internal circuits; must be connected to exposed pad via multiple thermal vias. |
| VCC | LDO output for internal bias | 5.77V regulated output; requires ≥2.2µF ceramic capacitor to GND; can be overdriven by auxiliary winding above 5.9V. |
| SYNC/DITHER | Multi-function control pin | Configurable for spread-spectrum dithering (±4–12%) or external clock sync (1.10–1.32× fSW); tie to GND if unused. |
| RT | Frequency programming node | Resistor to GND sets fSW (100–350kHz); open circuit defaults to 200kHz; enables precise EMI tuning. |
| TC/VCM | Temperature compensation & common-mode setting | Programs −1 to −2mV/°C diode VF compensation via RTC/VCM resistor; latched at power-up. |
| SS | Soft-start timing control | Capacitor to GND extends soft-start beyond default 5ms; limits inrush current into output capacitors. |
| SET | Regulated feedback reference node | 1.0V nominal reference (0.988–1.012V); current through RSET sets output regulation point with VOUT + VD. |
| OVI | Input overvoltage detection input | MAX17691A-specific pin; 1.215V rising threshold triggers shutdown; resumes at 1.1V falling threshold. |
| EN/UVLO | Enable and undervoltage lockout | 1.215V turn-on / 1.1V turn-off thresholds; resistor divider from VIN enables precise startup voltage setting. |
| FB | Primary-side feedback sensing | Connected to LX via resistor; senses reflected flyback voltage during secondary conduction for opto-free regulation. |
| LX | Switching node | Drain of integrated nMOSFET; connects directly to primary winding of flyback transformer; high dv/dt node. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto primary-side regulation | Eliminates optocoupler, TL431, and secondary-side compensation components - reduces BOM cost and saves ≥20% PCB area. |
| Integrated 76V/170mΩ nMOSFET | Enables complete flyback controller + switch in one 3mm × 3mm package - simplifies layout and improves reliability vs. discrete FET solutions. |
| Internal loop compensation | No external COMP network required - accelerates design cycle and removes stability tuning risk inherent in external compensation. |
| Programmable OVI + EN/UVLO | Two independent resistor-divider thresholds on same IC - allows precise input window control (e.g., start at 18V, shut down at 65V). |
| Temperature-compensated diode sensing | TC/VCM pin adjusts regulation setpoint vs. junction temp (+1.85mV/°C bias) to counteract VF drift of output rectifier. |
| Hiccup-mode overcurrent protection | 16384-cycle timeout before restart - prevents thermal runaway during sustained overload or short-circuit conditions. |
Applications
| PLC Digital I/O Module Supply | IGBT Gate Drive Isolation Rail |
|---|---|
|
Use Scenario: Providing isolated 15V/0.5A gate drive power for 3-phase motor control inverters in factory automation PLCs. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without optocoupler; handles 24VDC field bus input with OVI protection against transients. Use Value: Enables compact, certified reinforced isolation in tight module footprints while maintaining <±3% output regulation across temperature and load. |
Use Scenario: Generating isolated +15V/−8V dual-rail supply for SiC/IGBT gate drivers in industrial servo drives. IC Role / Device Role / Timing Role: No-opto flyback converter delivering tightly regulated, low-noise isolated bias with hiccup protection against gate short events. Use Value: Eliminates optocoupler aging concerns and reduces component count by 4–6 parts per channel versus traditional designs. |
| Industrial Ethernet Switch PoE Midspan | Telecom Remote Radio Unit (RRU) Bias |
|
Use Scenario: Generating isolated 3.3V/2A auxiliary supply for PHY and MCU in IEEE 802.3bt midspan injectors operating from 54V DC bus. IC Role / Device Role / Timing Role: High-efficiency flyback controller supporting 100kHz–350kHz switching to meet CISPR-22 Class B EMI limits in dense board layouts. Use Value: Achieves >90% efficiency at full load and 2.5µA shutdown current - critical for energy-efficient PoE infrastructure. |
Use Scenario: Providing isolated 5V/1A bias for RF front-end LNA and DAC in outdoor 5G RRUs exposed to −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust flyback regulator with −40°C to +125°C operation, thermal shutdown (160°C), and frequency dithering for EMI compliance. Use Value: Maintains stable output regulation despite wide temperature swings and high EMI noise floor in RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar no-opto isolated flyback converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17691BATC+T | Lacks OVI pin; includes COMP pin for external loop compensation; identical pinout and core specs except compensation architecture. | Suitable where design requires flexible compensation tuning or does not need input overvoltage protection. | Select MAX17691BATC+T only if external compensation is needed; MAX17691AATC+T is preferred for drop-in replacement in OVI-required systems. |
| UCC28911DR | TI device with 700V integrated MOSFET; no OVI; different control scheme (quasi-resonant); 8-pin SOIC package; lower max input (85V AC/120V DC). | Better suited for universal AC-input offline converters; not pin-compatible and lacks primary-side temperature compensation. | Choose UCC28911DR for AC/DC flyback with higher voltage stress; MAX17691AATC+T is superior for DC-input industrial systems requiring OVI and diode VF compensation. |
Compared with MAX17691BATC+T, MAX17691AATC+T offers built-in OVI protection and internal compensation-reducing external parts but limiting loop tuning flexibility. Versus UCC28911DR, it targets lower-input DC systems with tighter thermal and EMI control, plus unique temperature-aware regulation.
Availability
MAX17691AATC+T is available at Aetrix Electronics and suitable for PLC I/O modules, IGBT gate drive supplies, and industrial telecom power conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX17691AATC+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 MAX17691AATC+T belongs to Maxim's Rainier family of isolated power devices, designed specifically to simplify and shrink isolated DC-DC conversion in space- and reliability-constrained industrial systems.
FAQ
What is the function of the OVI pin on the MAX17691AATC+T?
The OVI (Overvoltage Input) pin on the MAX17691AATC+T provides dedicated input overvoltage protection. When the voltage at this pin exceeds 1.215V (typical rising threshold), the device stops switching to protect downstream circuitry. It resumes operation only after the OVI pin voltage falls below 1.1V (typical falling threshold). This feature is exclusive to the MAX17691A variant and is implemented using an external resistor divider from VIN to GND. The MAX17691AATC+T leverages this pin to add a second layer of input protection beyond the standard EN/UVLO functionality.
Does the MAX17691AATC+T require an external optocoupler for regulation?
No, the MAX17691AATC+T does not require an external optocoupler. It achieves accurate isolated output voltage regulation using primary-side sensing: it samples the reflected flyback voltage at the LX pin during secondary rectifier conduction and processes this signal internally to regulate output voltage without any secondary-side feedback components. This eliminates the optocoupler, TL431, and associated compensation network - reducing component count, PCB area, and long-term reliability risks associated with optocoupler aging.
How is the switching frequency programmed on the MAX17691AATC+T?
The switching frequency of the MAX17691AATC+T is programmed using a resistor (RRT) connected between the RT pin and GND. The relationship is RRT(kΩ) = 107 / fSWRT(kHz), enabling precise selection across 100kHz to 350kHz. Leaving the RT pin open configures the default 200kHz frequency. This resistor-based programming allows designers to optimize transformer size, EMI performance, and efficiency for each application - a key advantage over fixed-frequency alternatives. The MAX17691AATC+T also supports external clock synchronization via the SYNC/DITHER pin.
What thermal performance can be expected from the MAX17691AATC+T in a 4-layer PCB?
On a standard 4-layer PCB, the MAX17691AATC+T exhibits a junction-to-ambient thermal resistance (θJA) of 41°C/W and junction-to-case (θJC) of 8.5°C/W. With its exposed pad thermally connected to primary-side GND via multiple vias, the device sustains continuous operation up to +125°C ambient and +150°C junction temperature. Thermal shutdown activates at 160°C with 10°C hysteresis, ensuring robust protection. These values are measured per JEDEC JESD51-7 and enable reliable 7.5W output power delivery in compact industrial enclosures.
Can the MAX17691AATC+T compensate for temperature drift in the output rectifier diode?
Yes, the MAX17691AATC+T includes dedicated temperature compensation for the output rectifier diode's forward voltage (VF) drift. Using the TC/VCM pin, designers select a resistor (RTC/VCM) to program compensation coefficients from −1mV/°C to −2mV/°C. An internal +1.85mV/°C PTAT current is applied to the SET pin to offset VF changes, assuming diode temperature tracks the IC's junction temperature. This feature maintains tight output regulation across −40°C to +125°C ambient - a capability not found in most competing no-opto controllers.
MAX17691AATC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 100kHz ~ 350kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX17691AATC+T FAQ
1.How can I place an order for MAX17691AATC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17691AATC+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 MAX17691AATC+T reliable?
The price and inventory of MAX17691AATC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17691AATC+T is usually 5 days.
3.What payment methods are accepted for MAX17691AATC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17691AATC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17691AATC+T?
MAX17691AATC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17691AATC+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 MAX17691AATC+T?
For technical support, including MAX17691AATC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17691AATC+T requirements.
6.How does Aetrix verify that MAX17691AATC+T is sourced from the original manufacturer or authorized distributors?
All MAX17691AATC+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 MAX17691AATC+T meets industry standards.
7.What is the process for return or replacement of MAX17691AATC+T?
All MAX17691AATC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17691AATC+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 MAX17691AATC+T part is unused and in its original packaging.
Return procedure for MAX17691AATC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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