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Analog Devices Inc./Maxim Integrated MAX17691BATC+T
- Part No.:
- MAX17691BATC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17691BATC+T.pdf
- Description:
- IC REG FLYBACK 1.71A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,896
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Product details
Overview
MAX17691BATC+T from Maxim Integrated is a 4.2V–60V no-opto isolated flyback controller 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 operates across –40°C to +125°C ambient for industrial PLC I/O and IGBT gate drive supplies.
For engineers reviewing the MAX17691BATC+T datasheet, MAX17691BATC+T pinout, MAX17691BATC+T application, or MAX17691BATC+T equivalent, key selection considerations include its 100kHz–350kHz programmable switching frequency, EN/UVLO threshold programmability (1.215V typ), internal soft-start (5ms default), temperature-compensated diode forward-voltage sensing via TC/VCM pin, and external loop compensation capability exclusive to the MAX17691B variant.
Technical Context
The MAX17691BATC+T implements primary-side regulation by sampling the reflected flyback waveform at LX during secondary rectifier conduction-enabling accurate output voltage control without optocoupler or auxiliary winding. Its peak-current-mode architecture uses an internal 0.988V–1.012V SET reference and supports duty cycle up to 68% (oscillator-limited).
It features dual-function TC/VCM pin for both common-mode voltage selection and temperature compensation of output diode VF, with +1.85mV/°C bias and programmable IPTAT current via external resistor. The device supports external clock synchronization (1.10× to 1.32× fSW) and ±4%–±12% spread-spectrum dithering via SYNC/DITHER pin.
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 pre-regulation. |
| Integrated FET | 76V breakdown, 170mΩ RDS(ON) - enables compact 7.5W isolated designs with minimal external components. |
| Switching Frequency | Programmable 100kHz–350kHz via RT resistor - balances EMI, transformer size, and efficiency; 200kHz default when RT open. |
| Output Power | Up to 7.5W - sufficient for isolated gate drives, sensor interfaces, and PLC digital I/O modules. |
| Efficiency | >90% - achieved via low-RDS(ON) FET, optimized gate drive, and frequency fold-back at light load. |
| Operating Temperature | –40°C to +125°C ambient - qualified for harsh industrial environments with junction limit of +150°C. |
| Shutdown Current | 2.5µA - enables ultra-low-power disable states in battery-backed or energy-sensitive systems. |
Pinout & Package
MAX17691BATC+T is housed in a thermally enhanced 12-pin, 3mm × 3mm TDFN-EP package (package code TD1233+1C) with exposed pad soldered to primary-side GND for optimal thermal performance (θJA = 41°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply reference | 4.2V–60V primary input; serves as reference for FB divider; requires ≥1µF ceramic bypass to GND. |
| GND | Primary-side ground | Reference for all internal circuits; must connect to primary PCB ground plane with low-inductance path. |
| VCC | LDO output | 5.77V regulated supply for internal circuitry; requires ≥2.2µF ceramic capacitor to GND, placed adjacent to pin. |
| SYNC/DITHER | Frequency control interface | Configurable for external clock sync (rising-edge detection) or triangular-wave dithering; tie to GND if unused. |
| RT | Frequency programming | Resistor-to-GND sets fSW (100–350kHz); open-circuit yields 200kHz default; RRT = 107/fSW (kΩ). |
| TC/VCM | Temperature & common-mode control | Dual-function pin: selects KVCM setting and programs IPTAT current for diode VF temp compensation (–1 to –2mV/°C). |
| SS | Soft-start timing | Capacitor-to-GND extends soft-start beyond 5ms default; CSS (nF) = 5 × tSS (ms). |
| SET | Feedback reference node | 10kΩ resistor to GND establishes 1.0V reference; carries IPTAT current for temperature compensation. |
| COMP | Error amplifier output | Open-collector output for external compensation network (R-C-Zener); only present on MAX17691B variant. |
| EN/UVLO | Enable & input lockout | Resistor-divider from VIN sets turn-on (1.215V) and turn-off (1.1V) thresholds; enables precise brown-in/out control. |
| FB | Primary-side feedback | Senses reflected flyback voltage at LX; used with RFB to derive output voltage proportional signal without optocoupler. |
| LX | Switching node | Drain of internal nMOSFET; connects directly to primary winding of flyback transformer; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto primary-side regulation | Eliminates optocoupler, TL431, and secondary-side feedback components-reducing BOM count and saving ≥20% PCB area. |
| External loop compensation (MAX17691B) | COMP pin enables custom Type II/III compensation for dynamic response tuning across load/transient conditions. |
| Programmable input overvoltage protection | Not applicable to MAX17691B - OVI pin is MAX17691A-only; MAX17691BATC+T relies on EN/UVLO for input supervision only. |
| Temperature-compensated diode sensing | TC/VCM pin allows precise –1mV/°C to –2mV/°C compensation of output rectifier VF drift, improving output regulation stability over temperature. |
| Hiccup-mode overcurrent protection | Auto-retry shutdown after 16384 cycles under overload/short-circuit - protects MOSFET and transformer without latch-up. |
Applications
| PLC Digital I/O Modules | IGBT Gate Drive Supplies |
|---|---|
|
Use Scenario: Isolated 15V/–8V dual-rail supply powering opto-isolated input/output channels in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback, enabling compact multi-channel isolation. Use Value: Reduces component count per channel by eliminating optocouplers and secondary regulators, lowering total module cost and footprint. |
Use Scenario: 15V isolated supply for driving high-side IGBTs in motor inverters operating from 300–600V DC bus. IC Role / Device Role / Timing Role: No-opto flyback controller delivering stable gate drive voltage despite wide input variation and high dv/dt noise. Use Value: Maintains <±1.5% output regulation across –40°C to +125°C while rejecting common-mode noise on high-voltage primary side. |
| Industrial Sensor Transmitters | Telecom Remote Power Feeds |
|
Use Scenario: 24V-powered 4–20mA loop-powered transmitter requiring isolated 3.3V microcontroller supply and analog front-end bias. IC Role / Device Role / Timing Role: Single-chip isolated DC-DC converter providing reinforced insulation barrier between field-side and control-side circuits. Use Value: Achieves CISPR 22 Class B EMI compliance via frequency dithering and synchronization-critical for certified loop-powered devices. |
Use Scenario: Isolated 12V/1A feed for remote telecom line cards powered from centralized -48V DC plant battery. IC Role / Device Role / Timing Role: High-efficiency flyback controller operating down to 4.2V input-enabling operation during battery brownout events. Use Value: Delivers >90% efficiency at full load and 2.5µA shutdown current, extending backup runtime during AC failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17691AATC+T | Includes OVI pin for input overvoltage protection; internally compensated (no COMP pin); same pinout and package. | Preferred where input rail overvoltage risk exists (e.g., 48V telecom with lightning surge); not suitable if external loop tuning required. | Select MAX17691AATC+T when OVI functionality is needed and loop compensation flexibility is unnecessary. |
| UCC28911DR | TI's no-opto flyback controller with 700V integrated MOSFET; fixed 70kHz frequency; no frequency dithering or sync capability. | Better suited for universal AC-input offline converters (>100VAC); lacks programmable UVLO, TC/VCM, or spread-spectrum features. | Choose UCC28911DR only for cost-sensitive AC/DC applications above 85VAC input; not drop-in compatible with MAX17691BATC+T. |
Compared with MAX17691AATC+T, MAX17691BATC+T trades OVI protection for external loop compensation-enabling tighter transient response in dynamically loaded systems. Against UCC28911DR, it offers superior design flexibility (frequency programming, dithering, temperature compensation) but targets lower-input industrial DC systems rather than AC mains.
Availability
MAX17691BATC+T is available at Aetrix Electronics and suitable for industrial automation, motor control, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17691BATC+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 MAX17691B belongs to Maxim's Rainier family of isolated power devices-designed specifically to simplify and shrink isolated DC-DC conversion in space-constrained industrial systems using primary-side regulation.
FAQ
What is the key functional difference between MAX17691BATC+T and MAX17691AATC+T?
The MAX17691BATC+T features external loop compensation via the COMP pin, enabling custom Type II/III networks for dynamic response optimization, while the MAX17691AATC+T uses internal compensation and adds an OVI pin for input overvoltage protection. Both share identical pinout, package, and core regulation architecture-but MAX17691BATC+T is selected when loop tuning is required and OVI is not needed.
Does MAX17691BATC+T support frequency synchronization with other converters?
Yes, MAX17691BATC+T supports external clock synchronization via the SYNC/DITHER pin. An external clock signal (1.10× to 1.32× the nominal switching frequency) applied to this pin synchronizes the internal oscillator on the 10th or 11th rising edge, eliminating beat frequencies in multi-converter systems. The allowable sync range depends on the programmed fSW set by the RT resistor.
How is output diode forward-voltage temperature drift compensated in MAX17691BATC+T?
MAX17691BATC+T compensates for output diode VF drift using the TC/VCM pin. A resistor (RTC/VCM) connected to this pin generates a PTAT current (IPTAT) injected into the SET node. With +1.85mV/°C bias and programmable RTC/VCM values, the device achieves –1mV/°C to –2mV/°C compensation-directly offsetting typical Si diode VF temperature coefficients.
What is the maximum output power achievable with MAX17691BATC+T?
MAX17691BATC+T delivers up to 7.5W of isolated output power under typical conditions (e.g., 24V input, 15V output, 500kHz transformer). This assumes proper thermal design using the 3mm × 3mm TDFN-EP package with exposed pad connected to a multilayer PCB ground plane, achieving θJA = 41°C/W and maintaining junction temperature ≤150°C.
Can MAX17691BATC+T operate with input voltages below 12V?
Yes, MAX17691BATC+T supports input voltages as low as 4.2V-making it suitable for 5V, 9V, and 12V industrial DC systems. Its wide 4.2V–60V range enables use in battery-powered equipment, PoE-powered devices, and legacy 24V/36V infrastructure without input pre-regulation, provided minimum startup voltage is met via EN/UVLO resistor divider.
MAX17691BATC+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:
- 1.71A
- 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)
MAX17691BATC+T FAQ
1.How can I place an order for MAX17691BATC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17691BATC+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 MAX17691BATC+T reliable?
The price and inventory of MAX17691BATC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17691BATC+T is usually 5 days.
3.What payment methods are accepted for MAX17691BATC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17691BATC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17691BATC+T?
MAX17691BATC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17691BATC+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 MAX17691BATC+T?
For technical support, including MAX17691BATC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17691BATC+T requirements.
6.How does Aetrix verify that MAX17691BATC+T is sourced from the original manufacturer or authorized distributors?
All MAX17691BATC+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 MAX17691BATC+T meets industry standards.
7.What is the process for return or replacement of MAX17691BATC+T?
All MAX17691BATC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17691BATC+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 MAX17691BATC+T part is unused and in its original packaging.
Return procedure for MAX17691BATC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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