LTC3261EMSE#PBF

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The LTC3261EMSE#PBF is a high-frequency spread-spectrum DC/DC buck/boost/inverting switching regulator. This device integrates a current-mode controller and a power MOSFET in a small 6-lead SOT-23 package ideal for battery-powered applications. With the LTC3261EMSE#PBF, engineers can reduce the overall footprint of their design compared to more traditional linear regulators. The LTC3261EMSE#PBF is designed for DC/DC buck/boost/inverting conversion applications. The device is available in two output voltage configurations; single and dual. Single output voltage operation supports output voltage from 0.8V to 5.5V, up to 1A. Dual output voltage operation supports output voltages from 0V to 5.5V, up to 1A. The product supports an input voltage range of 3.3V to 5.5V, and supports peak current of 5A.

The product supports up to 1 MHz operation, and works with the device\'s current-mode control architecture, allowing for very low output voltage ripple. The toggle frequency can be spread in 1 MHz steps over a ±2.5% range to reduce EMI spurs, and the device\'s integrated soft start circuitry reduces startup current surges. The device also has an integrated voltage clamp that limits the maximum voltage seen by the output stage during a short circuit condition.

The LTC3261EMSE#PBF is ideal for portable, mobile, and wearable applications, where space is a premium, and efficiency, EMI, and transient regulation matters.

The LTC3261EMSE#PBF employs two main principles for regulating the voltage - the buck and the boost. The buck and boost principles each employ two main power transistors - a P-channel motherboard transistor and an N-channel output transistor.

When operating in buck mode, the power transistors are arranged in a series-parallel configuration. On one side, the P-channel device sits between the input and the output. The N-channel device sits on the other side, between the output and the ground. When switching, the N-channel device turns on and off alternately, proportionally controlling the current to the output node.

The boost mode uses the same series-parallel arrangement between the power transistors. However, the N-channel device sits between the input voltage and the output voltage, and the P-channel device sits between the output voltage and ground. This allows the device to convert a lower input voltage to a higher output voltage. This is done by using the P-channel device to store the energy while the N-channel device is in its off state, and then releasing it when the N-channel device turns on.

The LTC3261EMSE#PBF device also features a unique current-mode control architecture to regulate the output voltage. This architecture enables the regulator to perform fast response and very low output voltage ripple. The device also features spread spectrum modulation, which allows engineers to reduce the EMI emitters in the system. Other features of the device include a fast turn-on voltage clamps and an integrated start-up circuitry.

In conclusion, the LTC3261EMSE#PBF is an ideal solution for DC/DC buck/boost/inverting conversion applications in mobile, portable, and wearable designs. Its high-frequency switching regulator, small size and integrated protection features make it a perfect choice for these types of applications.

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