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MAX17690

MAX17690

60V, No-Opto Isolated Flyback Controller

Compact, Cost-Effective, and Easy-to-Implement Isolated DC-DC Controller

Data Sheet
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Overview

Description

The MAX17690 is a peak current mode, fixed-frequency switching controller specifically designed for the isolated flyback topology operating in Discontinuous Conduction Mode (DCM). The device senses the isolated output voltage directly from the primary-side flyback waveform during the off-time of the primary switch. No auxiliary winding or optocoupler is required for output voltage regulation.

The MAX17690 is designed to operate over a wide supply range from 4.5V to 60V. The switching frequency is programmable from 50kHz to 250kHz. A EN/UVLO pin allows the user to turn on/off the power supply precisely at the desired input voltage. The MAX17690 provides an input overvoltage protection through the OVI pin. The 7V internal LDO output of the MAX17690 makes it suitable for switching both logic-level and standard MOSFETs used in flyback converters. With 2A/4A source/sink currents, the MAX17690 is ideal for driving low RDS(ON) power MOSFETs with fast gate transition times. The MAX17690 provides an adjustable soft-start feature to limit the inrush current during startup.

The MAX17690 provides temperature compensation for the output diode forward voltage drop. The MAX17690 has robust hiccup-protection and thermal protection schemes, and is available in a space-saving 16-pin 3mm x 3mm TQFN package with a temperature range from -40°C to 125°C.


Get Started with No-Opto Flyback Technology and the MAX17690

MAX17690: Application Circuit MAX17690: Application Circuit Enlarge+

Key Features

  • 4.5V to 60V Input Voltage Range
  • No Optocoupler or Third Winding Required to Derive Feedback Signal Across Isolation Boundary
  • 2A/4A Peak Source/Sink Gate Drive Currents
  • 50kHz to 250kHz Programmable Switching Frequency
  • Input EN/UVLO Feature
  • Input Overvoltage Protection
  • Programmable Soft-Start
  • Hiccup-Mode Short-Circuit Protection
  • Thermal Shutdown Protection
  • -40°C to 125°C Operating Temperature Range
  • Space-Saving, 16-Pin 3 x 3 TQFN Package

Applications/Uses

  • Industrial and Telecom Applications
  • Isolated Flyback Converters
  • PLC I/O Modules
  • Wide-Range DC-Input Isolated Power Supplies

Parametric Specs

Part NumberApplication (VIN)VIN
(V)		VIN
(V)		TopologySwitch TypeFeedbackFreq.
(kHz)		Duty Cycle
(%)		ISTARTUP
(mA)		ICC
(mA)		Gate Drive Current
(A)		Design ToolsOper. Temp.
(°C)		Package/PinsBudgetary
Price
minmaxmaxmaxmaxmaxSee Notes
MAX17690 
Base Station (24V)
Industrial (24V)
Networking (48V)
4.560FlybackExternalPrimary Side250691.81.82EE-Sim-40 to +125
TQFN/16
$2.99 @1k
See All Isolated Power Supplies (25)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX17690EVKITA: Evaluation Kit for the MAX17690
MAX17690EVKITB: Evaluation Kit for the MAX17690
MAX17690EVKITC: Evaluation Kit for the MAX17690 In Dual-Output Configuration
MAX17690EVKITE: Evaluation Kit for MAX17690

Technical Documents

App Note 6394 How to Design a No-Opto Flyback Converter with Secondary-Side Synchronous Rectification

Quality and Environmental Data

Product Reliability Reports: MAX17690.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX17690

Tools & Models

  • EE-Sim: Design & Simulate MAX17690
  • MAX17690 SIMPLIS Schematic

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    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

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    Related Resources

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    Technical Docs

    Reference Designs

    Type ID Title
    System Board6720MAXREFDES1098: Miniature, 24V/500mA, No-Opto Flyback DC-DC Converter with 92% Efficiency Using the MAX17690
    System Board6719MAXREFDES1173: Miniature, 12V/1A, No-Opto Flyback DC-DC Converter with 91.3% Efficiency Using the MAX17690
    System Board6718MAXREFDES1099: Miniature, 24V/500mA, No-Opto Flyback DC-DC Converter with 93% Efficiency Using the MAX17690
    System Board6716MAXREFDES1104: Miniature, 5V/2A, Synchronous, No-Opto Flyback DC-DC Converter with 90% Efficiency Using MAX17690 and MAX17606
    System Board6715MAXREFDES1105: Miniature, 5V/2A, Synchronous, No-Opto Flyback DC-DC Converter with 90.4% Efficiency Using MAX17690 and MAX17606
    System Board6710MAXREFDES1106: Miniature, 12V/1A, Synchronous, No-Opto Flyback DC-DC Converter with 92% Efficiency Using MAX17690 and MAX17606
    System Board6709MAXREFDES1172: Miniature, 12V/1A, No-Opto Flyback DC-DC Converter with 90% Efficiency Using the MAX17690
    System Board6708MAXREFDES1107: Miniature, 12V/1A, Synchronous, No-Opto Flyback DC-DC Converter with 92.8% Efficiency Using MAX17690 and MAX17606
    System Board6704MAXREFDES1179: PoE Powered Device and 24V/300mA No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B
    System Board6703MAXREFDES1178: PoE Powered Device and Synchronous 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B
    System Board6702MAXREFDES1177: PoE Powered Device and 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B
    System Board6687MAXREFDES1176: PoE Powered Device and Synchronous 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B
    System Board6686MAXREFDES1175: PoE Powered Device and 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B
    System Board6615MAXREFDES1053: Miniature, 12V/2.5A, Synchronous, No-Opto Flyback DC-DC Converter with 89.6% Efficiency
    System Board6592MAXREFDES1149: 12V/1A, Synchronous, No-Opto Isolated PoE DC-DC Converter
    System Board6591MAXREFDES1148: 5V/2.5A, Synchronous, No-Opto Isolated PoE DC-DC Converter
    System Board6588MAXREFDES1040: 59.4W, No-Opto Flyback DC-DC Converter
    System Board6586MAXREFDES1103: Miniature, 24V/250mA, No-Opto Flyback DC-DC Converter with 91.7% Efficiency Using the MAX17690
    System Board6583MAXREFDES1101: Miniature, 12V/500mA, No-Opto Flyback DC-DC Converter with 90% Efficiency
    System Board6581MAXREFDES1100: Miniature, 12V/500mA, No-Opto Flyback DC-DC Converter with 90% Efficiency
    System Board6580MAXREFDES1095: Miniature, 12V/500mA, Synchronous, No-Opto Flyback DC-DC Converter with 92.8% Efficiency
    System Board6579MAXREFDES1094: Miniature, 12V/500mA, Synchronous, No-Opto Flyback DC-DC Converter with 91.9% Efficiency
    System Board6578MAXREFDES1093: Miniature, 5V/1A, Synchronous, No-Opto Flyback DC-DC Converter with 92% Efficiency
    System Board6577MAXREFDES1092: Miniature, 5V/1A, Synchronous, No-Opto Flyback DC-DC Converter with 91.5% Efficiency
    System Board6574MAXREFDES1090: Miniature, 12V/250mA, No-Opto Flyback DC-DC Converter with 91.3% Efficiency
    System Board6573MAXREFDES1088: Miniature, 12V/250mA, Synchronous, No-Opto Flyback DC-DC Converter with 91.9% Efficiency
    System Board6572MAXREFDES1087: Miniature, 5V/500mA, Synchronous, No-Opto Flyback DC-DC Converter with 91.4% Efficiency
    System Board6571MAXREFDES1086: Miniature, 5V/500mA, Synchronous, No-Opto Flyback DC-DC Converter with 91.4% Efficiency
    System Board6570MAXREFDES1102: Miniature, 24V/250mA, No-Opto Flyback DC-DC Converter with 92% Efficiency
    System Board6569MAXREFDES1089: Miniature, 12V/250mA, Synchronous, No-Opto Flyback DC-DC Converter with 91.7% Efficiency
    System Board6568MAXREFDES1091: Miniature, 12V/250mA, No-Opto Flyback DC-DC Converter with 91% Efficiency
    System Board6497MAXREFDES1012: Miniature, 5.3V/2A, Synchronous, No-Opto Flyback DC-DC Converter with 91.4% Efficiency Using MAX17690 and MAX17606
    System Board6492MAXREFDES1014: 48V/80mA, No-Opto Isolated Flyback DC-DC Converter Using MAX17690
    System Board6491MAXREFDES1022: 5V/2A, Synchronous No-Opto Isolated Flyback DC-DC Converter
    System Board6398MAXREFDES124#: Isolated 12V to 5.5V 22W No-Opto Flyback Power Supply
    System Board6348MAXREFDES119#: Isolated 24V to 5V, 9W No-Opto Flyback Power Supply
    Evaluation Board9886MAX17690EVKITE Evaluation Kit for MAX17690
    Evaluation Board9523MAX17690EVKITC Evaluation Kit for the MAX17690 In Dual-Output Configuration
    Evaluation Board9195MAX17690EVKITB Evaluation Kit for the MAX17690
    Evaluation Board9111MAX17690EVKITA Evaluation Kit for the MAX17690