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Analog Devices Inc./Maxim Integrated MAX17693BATC+
- Part No.:
- MAX17693BATC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17693BATC+.pdf
- Description:
- IC REG FLYBACK ADJ 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:582
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Product details
Overview
MAX17693BATC+ 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 operates from –40°C to +125°C ambient. It is used in PLC I/O modules and IGBT gate drive supplies where compact, optocoupler-free isolation is required.
For engineers reviewing the MAX17693BATC+ datasheet, MAX17693BATC+ pinout, MAX17693BATC+ application, or MAX17693BATC+ equivalent, key selection considerations include its no-opto regulation architecture, EN/UVLO programmability, external loop compensation (via COMP pin), temperature-compensated diode forward-voltage sensing, and TDFN-EP 3mm × 3mm package with exposed pad for thermal management.
Technical Context
The MAX17693BATC+ implements primary-side sensing by sampling the reflected flyback waveform at the LX node during secondary diode conduction, eliminating need for optocoupler or secondary error amplifier. Its peak-current-mode controller uses an internal 1.215V reference for EN/UVLO and SET regulation (1.0V typical), with programmable soft-start via SS pin and frequency dithering via SYNC/DITHER pin.
Unlike the MAX17693A variant, the MAX17693B uses external loop compensation through the COMP pin (transconductance 660µS, sink/source ±55µA), enabling custom stability tuning. It supports external clock synchronization (1.10–1.32× fSW) and features hiccup-mode overcurrent protection with 16384-cycle timeout, thermal shutdown at 160°C, and OVI functionality excluded (OVI pin repurposed as COMP).
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, 245mΩ RDS(ON) - enables high-efficiency, low-component-count flyback designs up to 1.4W output. |
| Switching Frequency | Programmable 100–350kHz via RT resistor - balances EMI, transformer size, and efficiency; default 200kHz when RT open. |
| Output Regulation | No-opto primary-side sensing - eliminates optocoupler, secondary-side error amp, and associated layout complexity and PCB area. |
| Soft-Start Time | Default 5ms (typ), programmable >5ms via SS-to-GND capacitor - prevents inrush current stress on input capacitors and transformer. |
| Operating Temperature | –40°C to +125°C ambient - qualified for harsh industrial environments including factory automation and telecom infrastructure. |
| Shutdown Current | 2.5µA - enables ultra-low-power standby modes in battery-backed or energy-sensitive systems. |
Pinout & Package
MAX17693BATC+ is housed in a thermally enhanced 12-pin TDFN-EP package (3mm × 3mm, TD1233+1C), with exposed pad soldered to primary-side GND for optimal thermal dissipation (θJA = 41°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply rail | 4.2–60V input connection; also serves as reference for FB divider; 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-regulated bias supply | 5.77V (typ) output powering internal circuitry; requires 2.2µF ceramic cap to GND placed adjacent to pin. |
| SYNC/DITHER | Frequency control interface | Configurable for external clock sync (rising-edge detection) or spread-spectrum dithering (±4–12%); tie to GND if unused. |
| RT | Switching frequency programming | Resistor-to-GND sets fSW; open-circuit defaults to 200kHz; RRT = 107/fSWRT (kΩ). |
| TC/VCM | Temperature compensation & common-mode setting | Programs diode VF tempco (–1 to –2mV/°C) and selects internal analog block operating range via RTC/VCM resistor. |
| SS | Soft-start timing control | Capacitor-to-GND extends startup ramp beyond 5ms; CSS (nF) = 5 × tSS (ms). |
| SET | Feedback reference node | 1.0V regulated input; current through RSET mirrors FB current; enables output voltage calculation without optocoupler. |
| COMP | External error amplifier output | Connect RC network between COMP and GND for custom loop compensation; transconductance = 660µS. |
| EN/UVLO | Enable and input UVLO threshold | Resistor-divider from VIN sets turn-on at 1.215V (rising); device halts below 1.1V (falling). |
| FB | Primary-side feedback sense | Connected to LX via resistor; senses reflected flyback voltage during secondary conduction for regulation. |
| LX | Switching node | Drain of internal nMOSFET; connects directly to primary winding of flyback transformer. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto primary-side regulation | Eliminates optocoupler, secondary error amplifier, and auxiliary winding - reduces BOM count and saves ≥20% PCB area vs. traditional flyback. |
| External loop compensation (COMP) | Enables precise phase/gain tuning for diverse transformer designs and load transient requirements - not available on MAX17693A. |
| Programmable frequency dithering | Reduces EMI peak emissions by spreading switching energy across ±4–12% bandwidth - simplifies compliance with CISPR 22/32 Class B limits. |
| Temperature-compensated diode sensing | Compensates for VF drift of output rectifier over –40°C to +125°C - maintains ±1.5% output regulation accuracy across temperature. |
| Hiccup-mode overcurrent protection | Shuts down on sustained overload and auto-restarts after 16384 switching cycles - protects MOSFET and transformer under short-circuit conditions. |
Applications
| PLC Digital I/O Modules | IGBT Gate Drive Isolation |
|---|---|
Use Scenario: Isolated 5V/0.25A supply for digital input conditioning and output driver stages in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller providing galvanic isolation between field-side and logic-side circuits. Use Value: Enables compact, certified (IEC 61000-4-x) isolation without optocoupler aging or secondary-side component drift. | Use Scenario: Dedicated 15V/0.1A isolated supply for driving high-side IGBT gates in motor inverters and UPS systems. IC Role / Device Role / Timing Role: Regulated auxiliary supply generating clean, stable gate voltage referenced to IGBT emitter potential. Use Value: Maintains tight VGE tolerance despite diode VF variation across temperature - critical for consistent IGBT switching behavior. |
| Industrial Sensor Transmitters | Telecom Remote PHY Units |
Use Scenario: 3.3V/0.3A isolated power for 4–20mA loop-powered sensors with HART modulation capability. IC Role / Device Role / Timing Role: Input-wide (12–48V DC) flyback converter delivering low-noise, ripple-free supply for precision ADCs and modulators. Use Value: Achieves <10mVpp output ripple and <0.5% load regulation - preserves sensor measurement integrity and HART signal fidelity. | Use Scenario: Compact 12V/0.15A isolated supply in remote PHY (R-PHY) nodes deployed in fiber-deep cable access networks. IC Role / Device Role / Timing Role: High-density, low-EMI DC-DC stage meeting DOCSIS 3.1/4.0 spectral mask requirements in space-constrained enclosures. Use Value: Frequency synchronization and dithering allow co-location with multiple converters on shared input bus without beat-frequency interference. |
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 |
|---|---|---|---|
| MAX17693AATC+ | Internally compensated; OVI pin present; no COMP pin - fixed loop response, no external tuning. | Better suited for cost-sensitive, fixed-transformer designs where loop stability is guaranteed across production lot. | Select MAX17693AATC+ when design reuse, faster qualification, or elimination of compensation components is prioritized. |
| UCC28740DR | TI part with similar no-opto architecture but different control algorithm (valley-switching), 700V FET, 10–42V input, no TC/VCM or dithering. | Targeted at higher-power AC/DC adapters (up to 25W); lacks temperature compensation and EMI dithering features. | Choose UCC28740DR only for higher-input-voltage, higher-output-power applications where Maxim's industrial temp grade and diode VF compensation are not required. |
Compared with MAX17693AATC+, the MAX17693BATC+ trades internal compensation simplicity for full loop tuning flexibility and removes OVI in favor of COMP - making it ideal for custom transformer designs requiring dynamic response optimization. Against UCC28740DR, it offers superior thermal robustness, integrated diode tempco, and dedicated EMI reduction features at lower power levels.
Availability
MAX17693BATC+ is available at Aetrix Electronics and suitable for PLC I/O modules, IGBT gate drive supplies, industrial sensor transmitters, and telecom remote PHY units requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17693BATC+ 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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.
The MAX17693B belongs to Maxim's Rainier family of isolated power devices - engineered specifically for compact, no-opto flyback converters targeting space-constrained industrial and telecom applications demanding high reliability and simplified certification.
FAQ
What is the maximum output power achievable with the MAX17693BATC+?
The MAX17693BATC+ delivers up to 1.4W of isolated output power under typical conditions (e.g., 24V input, 5V/0.25A output). Actual power depends on transformer design, layout, thermal management, and ambient temperature. Derating is required above +70°C ambient due to thermal limits - continuous power dissipation is 1951.2mW on a multilayer board at TA = +70°C, with 24.4mW/°C derating above that point. The MAX17693BATC+ datasheet specifies this limit explicitly in Absolute Maximum Ratings.
Does the MAX17693BATC+ require an optocoupler for regulation?
No, the MAX17693BATC+ does not require an optocoupler. It uses a proprietary no-opto algorithm that samples the reflected flyback voltage at the LX pin during secondary diode conduction to regulate output voltage directly from the primary side. This eliminates the optocoupler, secondary-side error amplifier, and associated compensation components - reducing BOM count, PCB area, and long-term reliability risks associated with optocoupler aging. The MAX17693BATC+ achieves this using internal differential amplifiers, SET pin referencing, and precise timing control.
How is loop compensation implemented on the MAX17693BATC+?
Loop compensation on the MAX17693BATC+ is implemented externally via the COMP pin - unlike the internally compensated MAX17693A. A resistor-capacitor network is connected between COMP and GND to tailor phase margin and transient response for specific transformer and load characteristics. The internal error amplifier has 660µS transconductance and supports ±55µA sink/source current. This external flexibility allows designers to optimize stability across varying line/load conditions and transformer parasitics - a key differentiator of the MAX17693BATC+ within the Rainier family.
What is the function of the TC/VCM pin on the MAX17693BATC+?
The TC/VCM pin on the MAX17693BATC+ serves two functions: (1) selecting the internal common-mode voltage range (KVCM ≥ 2.5 or < 2.5) for proper analog block operation, and (2) enabling temperature compensation of the output rectifier diode's forward voltage drop. A resistor (RTC/VCM) connected to TC/VCM generates a PTAT current injected into the SET node, counteracting VF drift over temperature. The pin voltage is regulated at 0.55V (25°C) with +1.85mV/°C coefficient - allowing programmable compensation from –1mV/°C to –2mV/°C. This ensures stable output regulation across –40°C to +125°C ambient.
Can the MAX17693BATC+ synchronize its switching frequency to an external clock?
Yes, the MAX17693BATC+ can synchronize its switching frequency to an external clock applied to the SYNC/DITHER pin. The device detects the rising edge of the 9th consecutive external clock pulse and aligns its internal oscillator to the external frequency on the 10th or 11th pulse. Valid synchronization range is 1.10× to 1.32× the nominal fSWRT set by the RT resistor. This feature prevents low-frequency beat interference in multi-converter systems sharing the same input bus - a critical requirement in dense industrial power architectures. The MAX17693BATC+ datasheet specifies timing and voltage thresholds for reliable sync operation.
MAX17693BATC+ 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)
MAX17693BATC+ FAQ
1.How can I place an order for MAX17693BATC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17693BATC+ 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 MAX17693BATC+ reliable?
The price and inventory of MAX17693BATC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17693BATC+ is usually 5 days.
3.What payment methods are accepted for MAX17693BATC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17693BATC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17693BATC+?
MAX17693BATC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17693BATC+ 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 MAX17693BATC+?
For technical support, including MAX17693BATC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17693BATC+ requirements.
6.How does Aetrix verify that MAX17693BATC+ is sourced from the original manufacturer or authorized distributors?
All MAX17693BATC+ 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 MAX17693BATC+ meets industry standards.
7.What is the process for return or replacement of MAX17693BATC+?
All MAX17693BATC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17693BATC+, 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 MAX17693BATC+ part is unused and in its original packaging.
Return procedure for MAX17693BATC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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