MAX17691B

4.2V–60V No-Opto Isolated Flyback Converter with Integrated FET

Reduce Solution Size and Component Count by Up to 30%


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Description

Maxim's Rainier family of isolated power devices enable cooler, smaller, and simpler power-supply solutions. The MAX17691A/B is a high efficiency no-opto integrated nMOSFET flyback converter that uses fixed frequency peak current mode control. The device senses the isolated output voltage directly from the primary-side flyback waveform during the off-time of the integrated nMOSFET. No secondary-side error amplifier and optocoupler are required to provide an accurate, isolated, regulated output voltage, saving up to 20% of PCB space normally required for a traditional flyback converter.

The MAX17691A/B features a low RDS(ON), 76V, 170mΩ integrated nMOSFET primary switch and is designed to operate over a wide supply range from 4.2V to 60V. The switching frequency of the device is programmable from 100kHz to 350kHz. An EN/UVLO feature allows the user to turn ON/OFF the power converter precisely at the desired input voltage. Input overvoltage protection can be implemented using the OVI pin (MAX17691A only). Softstart limits inrush current at startup. The MAX17691A/B supports external clock synchronization to avoid low-frequency “beats” on the input bus in systems with multiple converters. The device also has programmable frequency dithering for low-EMI, spread-spectrum operation.

The MAX17691A/B allows temperature compensation for variations in the output rectifier diode forward voltage drop. The MAX17691A is internally compensated for loop stability, while the MAX17691B offers external loop compensation flexibility. The MAX17691A/B has robust hiccup- protection and thermal protection schemes, and is available in a space-saving 12-pin, 3mm x 3mm TDFN package with a temperature range from -40°C to +125°C.

MAX17691A, MAX17691B: Typical Application Circuit MAX17691A, MAX17691B: Typical Application Circuit Enlarge+

Key Features

  • Reduces External Components and Total Cost
    • Eliminates the Optocoupler and Secondary-Side Error Amplifier
    • Up to 20% Space Savings
    • 76V, Low RDS(ON) Integrated nMOSFET
    • Internal Loop Compensation (MAX17691A)
    • Built-In Soft-Start
  • Reduces Power Dissipation
    • > 90% Efficiency
    • Delivers up to 7.5W Output Power
    • Frequency Fold-Back Enables Enhanced Light-Load Efficiency
    • 2.5µA Shutdown Current
  • Supports Key System-Level Design Requirements
    • Frequency Dithering Supports Low-EMI, Spread-Spectrum Operation
    • Switching Frequency Synchronization
    • Compliant with CISPR22 ClassB EMI Requirements
  • Operates Reliably in Adverse Environments
    • Optional Output Voltage Temperature Compensation
    • Hiccup Current-Limit Protection
    • Programmable EN/UVLO Threshold
    • Input Overvoltage (OVI) Protection (MAX17691A)
    • Overtemperature Protection
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

Applications/Uses

  • Isolated Power Supplies
  • PLC I/O Modules
  • IGBT Gate Drive Supplies
  • Industrial and Telecom Applications

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.

MAX17691AEVKIT: Evaluation Kit for the MAX17691A in 5V Output-Voltage Application
Request Reliability Report for: MAX17691B 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

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Related Resources


MAX17691A
4.2V–60V No-Opto Isolated Flyback Converter with Integrated FET

  • Reduces External Components and Total Cost
  • Reduces Power Dissipation
  • Supports Key System-Level Design Requirements

MAX17691B
4.2V–60V No-Opto Isolated Flyback Converter with Integrated FET

  • Reduces External Components and Total Cost
  • Reduces Power Dissipation
  • Supports Key System-Level Design Requirements

Type ID Title
Evaluation Board10697MAX17691AEVKIT Evaluation Kit for the MAX17691A in 5V Output-Voltage Application