LT3514EFE#PBF

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The LT3514EFE#PBF is an integrated circuit designed by Analog Devices Inc. for use in multi-phase power supply systems. It functions as a dual output synchronous buck regulator, providing an adjustable output voltage in the range of 0V to 20V and a constant current output in the range of 0A to 4A. The LT3514EFE#PBF is most commonly used in mobile device applications such as mobile phones and PDAs, laptop computers, medical instruments and industrial equipment.

The LT3514EFE#PBF integrates two synchronous gate drivers, two floating high-side switches, two integrated current sense amplifiers and two programmable output current limiters. The integrated control logic provides synchronous operation of the two floating MOSFETs, reducing total solution cost and size. The LT3514EFE#PBF also offers programmable switching frequency, soft start, over-current protection, thermal shutdown and over-temperature protection.

The output voltage of the LT3514EFE#PBF can be programmed via external resistors, requiring no external components. It also has a minimum pulse-width of 1µs, making it ideal for high-current applications such as touchscreens, handheld phones and portable medical instruments.

The LT3514EFE#PBF features a wide input voltage range of 4.5V to 24V. It also provides high efficiency with low ripple, up to 95% and 0.5mVrms, respectively. With a very fast transient response, acceptability of higher current peaks and higher power density, the LT3514EFE#PBF makes an ideal choice for applications requiring compact and robust power supplies.

Working Principle

The LT3514EFE#PBF operates in step-down or buck mode. It uses two synchronous floating N-channel MOSFETs as low side and high side switches that provide a low-loss conduction path for the input current. The power switch can be driven at high or low sides and with a tight matching of the upper and lower FETs, significant efficiency improvement is achieved over single-ended topologies. The inductor current is sensed by an integrated current sense amplifier and converted to a voltage signal, set to be proportional to the inductor current, eliminating the need for an external current sense resistor.

The internally integrated driver and high-side current sense amplifier feature high bandwidth operation, tight output voltage and current regulation, low noise operation, fast transient and over-current protection. The LT3514EFE#PBF also integrates thermal protection circuitry to prevent system damage in the event of an over-temperature condition.

Conclusion

The LT3514EFE#PBF is a dual output synchronous buck regulator that provides high efficiency, low ripple and very fast transient response. It offers an adjustable output voltage range of 0V to 20V, a constant current output range of 0A to 4A and over-temperature and over-current protection. All of which make it an ideal choice for applications requiring compact and robust power supplies.

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