General Description

The MAX17498A/MAX17498B/MAX17498C devices are current-mode fixed-frequency flyback/boost converters with a minimum number of external components. They contain all the control circuitry required to design wide input voltage isolated and nonisolated power supplies. The MAX17498A has its rising/falling undervoltage lockout (UVLO) thresholds optimized for universal offline (85V AC to 265V AC) applications, while the MAX17498B/MAX17498C support UVLO thresholds suitable to low voltage DC-DC applications.

Benefits and Features

♦ Peak Current-Mode Converter

♦ Current-Mode Control Provides Excellent

   Transient Response

♦ Fixed Switching Frequency

   ◇ 250kHz: MAX17498A/MAX17498C

   ◇ 500kHz: MAX17498B

♦ Flexible Error Amplifier to Regulate Both Positive

   and Negative Outputs

♦ Programmable Soft-Start to Reduce Input Inrush Current

♦ Programmable Voltage or Current Soft-Start

♦ Power-Good Signal (PGOOD)

♦ Reduced Power Dissipation Under Fault

   ◇ Overcurrent Protection

   ◇ Thermal Shutdown with Hysteresis

♦ Robust Protection Features

   ◇ Programmable Current Limit

   ◇ Input Overvoltage Protection

♦ Optimized Loop Performance

   ◇ Programmable Slope Compensation

♦ High Efficiency

   ◇ Low RDSON, 175mI, 65V Rated Internal

      n-Channel MOSFET

   ◇ No Current-Sense Resistor

♦ Optional Spread Spectrum

♦ Space-Saving, 16-Pin (3mm x 3mm) TQFN Package

Applications

   Front-End AC-DC Power Supplies for Industrial Applications (Isolated and Nonisolated)

   Telecom Power Supplies

   Wide Input Range DC Input Flyback/Boost Industrial Power Supplies