LT3690IUFE#TRPBF

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The LT3690IUFE#TRPBF is a synchronous dc-dc step-up/step-down converter integrated circuit (IC), and is part of the PMIC – Voltage Regulators – DC DC Switching Regulators family. It incorporates a high-side and low-side power MOSFETs, a wide input voltage range, a wide output voltage range, programmable switching frequency, built-in soft-start, and adjustable over-current protection.

The LT3690IUFE#TRPBF is particularly suitable for portable applications, such as mobile phones, PDAs, and other handheld devices. It operates with a wide input voltage range of 2.25V to 5.5V, and can produce regulated outputs as high as 15V. Additionally, it features a programmable switching frequency of between 200kHz and 2.2MHz, a shutdown current of 0.5μA (max), and a very low external parts count.

The LT3690IUFE#TRPBF uses a synchronous dc-dc conversion method to control the output voltage. This method utilizes a high-side and low-side power MOSFET switch connected together in a synchronous buck-boost configuration. While the input voltage remains constant, the output voltage is converted by charging and discharging an external inductor. In a buck-boost configuration, either the high-side or the low-side switch (depending on the output voltage) is activated, allowing current to flow through the inductor and the other switch. When the current through the inductor reaches its peak, the reference turns off the current switch and turns on the other switch, allowing the current to be discharged in the opposite direction.

The LT3690IUFE#TRPBF also features an integrated soft-start circuit and adjustable overcurrent protection. The circuit is programmed to incrementally increase the output voltage over a certain time period, thus eliminating large inrush currents and sudden voltage spikes when the converter is switched on. Additionally, the circuit features a programmable over-current protection circuit which triggers during output overload conditions. When the output current exceeds a certain level, the circuit shuts off the output and protects the device from damage. This feature ensures higher reliability in systems with dynamic loads.

In summary, the LT3690IUFE#TRPBF is a versatile, cost-effective integrated circuit suited for use in portable and industrial applications. It is highly efficient, reliable, and easily configurable for a wide range of input and output voltages. Its adjustable overcurrent protection and soft-start circuits provide additional protection for valuable loads, ensuring greater system reliability.

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