General Description：

The MAX17498A/MAX17498B/MAX17498C devices arecurrent-mode fixed-frequency flyback/boost converterswith a minimum number of external components. Theycontain all the control circuitry required to design wideinput voltage isolated and nonisolated power supplies.The MAX17498A has its rising/falling undervoltage lockout (UVLO) thresholds optimized for universal offline (85VAC to 265V AC) applications, while the MAX17498B/MAX17498C support UVLO thresholds suitable to lowvoltage DC-DC applications.The switching frequency of the MAX17498A/MAX17498Cis 250kHz, while that of the MAX17498B is 500kHz. Thesefrequencies allow the use of tiny magnetic and filter components, resulting in compact, cost-effective power supplies. An EN/UVLO input allows the user to start the powersupply precisely at the desired input voltage, while alsofunctioning as an on/off pin. The OVI pin enables implementation of an input overvoltage-protection scheme thatensures that the converter shuts down when the DC inputvoltage exceeds the desired maximum value.The devices incorporate a flexible error amplifier andan accurate reference voltage (REF) to enable the enduser to regulate both positive and negative outputs.Programmable current limit allows proper sizing and protection of the primary switching FET. The devices supporta maximum duty cycle greater than 92% and provideprogrammable slope compensation to allow optimizationof control loop performance. The devices provide anopen-drain PGOOD pin that serves as a power-goodindicator and enters the high-impedance state to indicate that the flyback/boost converter is in regulation.An SS pin allows programmable soft-start time for theflyback/boost converter. Hiccup-mode overcurrent protection and thermal shutdown are provided to minimizedissipation under overcurrent and overtemperature faultconditions. The devices are available in a space-saving,16-pin (3mm x 3mm) TQFN package with 0.5mm leadspacing. 

Benefits and Features：

● Peak Current-Mode Converter

● Current-Mode Control Provides Excellent TransientResponse

● Fixed Switching Frequency

• 250kHz: MAX17498A/MAX17498C

• 500kHz: MAX17498B

● Flexible Error Amplifier to Regulate Both Positive andNegative Outputs

● 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

• Fixed Default Slope Compensation in CurrentSoft-Start

• Fixed Default and Programmable Slope Compensation in Voltage Soft-Start

● High Efficiency

• Low RDSON, 175mΩ, 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 IndustrialApplications (Isolated and Nonisolated)

● Telecom Power Supplies

● Wide Input Range DC Input Flyback/Boost IndustrialPower Supplies