Push-Pull FET Driver with Integrated Oscillator and Programmable Clock Output

All versions are Not Recommended for New Designs. See Ordering Information for recommended replacements.

The MAX5077 is a +4.5V to +15V push-pull, current-fed topology driver subsystem with an integrated oscillator used in telecom module power supplies. The device drives two MOSFETs connected to a center-tapped transformer primary providing secondary-side, isolated, negative or positive voltages. The MAX5077 features a programmable accurate integrated oscillator with a synchronizing clock output to synchronize an external PWM regulator. A single external resistor programs the internal oscillator frequency from 50kHz to 1.5MHz.

The MAX5077 incorporates dual MOSFET drivers with ±3A peak drive currents and 50% duty cycle. The MOSFET drivers generate complementary signals to drive external ground-referenced n-channel MOSFETs.

The MAX5077 clock output frequency is programmable by logic inputs to set the clock output to 1x, 2x, or 4x the MOSFET's driver frequency.

The MAX5077 is available in a 14-pin exposed pad TSSOP package and is specified over the -40°C to +125°C operating temperature range.

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