LT3481EMSE#PBF

LT3481 is an adjustable frequency (300KHz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum). A high efficiency 0.18ohm switch is included on the die along with a boost schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple burst mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3481 can further enhance low output current efficiency by drawing bias current from the output when VOUT is above 3V. Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). Applications include automotive battery regulation, power for portable products, distributed supply regulation, industrial supplies and wall transformer regulation.

• Wide input range from 3.6V to 34V operating, 36V maximum
• 2A maximum output current
• Low ripple burst mode operation (50μA IQ at 12VIN to 3.3VOUT, output ripple <lt/> 15mV)
• Power good flag signals when VOUT reaches 90% of the programmed output voltage
• Adjustable switching frequency from 300KHz to 2.8MHz
• Low shutdown current of <lt/> 1μA, integrated boost diode
• Saturating switch design, 0.18ohm on-resistance
• 1.265V feedback reference voltage, output voltage of 1.265V to 20V
• Soft-start capability, synchronizable between 275KHz to 475KHz
• 10-lead plastic MSOP package, temperature range from –40°C to 85°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party