LTC3646HMSE#PBF

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The LTC3646HMSE#PBF is a high frequency, synchronous, dual output step-down switching regulator. It is a flexible solution for generating two separate supplies with the same output voltage and current. The LTC3646HMSE#PBF has an input voltage range of 2.9V to 5.5V and an adjustable output voltage range of 0.8V to VIN. The output currents of the two outputs can be supplied up to 150mA. It also supports power path functions, allowing the output voltage to remain constant even when battery voltages are outside the input range. It has an integrated 1MHz synchronous switch which integrates power MOSFETs, programmable switching frequency, enabling the current mode control, and pulse frequency modulation (PFM) for low-noise operation. It also provides an input voltage monitoring function to prevent charge pump malfunction, an integrated low-dropout linear regulator (LDO) to serve as a stable reference, and a selectable power-down mode.

The LTC3646HMSE#PBF is easily configured using the integrated linear-gain control and can be set in either constant voltage or regulated current modes. It also offers protection features like over-current and under-voltage protection. This device is optimized for Synchronous Buck applications, making it ideal for applications such as 5V-to-1.2V or 3.3V-to-1.8V conversion. It also supports tracking from one output to another as well as a wide range of switching frequencies.

The application field of the LTC3646HMSE#PBF is for powering a wide range of mobile devices, peripherals and audio amplifiers, such as cell phones, PDAs, USB Host/Device, laptop PCs, and any device requiring multiple supply rails. It can also be used as a power delivery system for point-of-load regulators or high output current regulation.

Working Principle

The operation of the LTC3646HMSE#PBF is based on a single-stage synchronous buck topology. The integrated dual switches are driven by a high-frequency, low-side synchronous driver, allowing for a wide spread of duty cycles. It works in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) for more flexibility. The wide-range power range and adjustable output voltage, combined with the current mode control, make this IC perfect for applications with extended current range in either CCM or DCM.

The utility of this IC can be further improved by its selectable, integrated, low-dropout linear regulator (LDO). This LDO output can be used to power high-impedance loads such as audio amplifiers, or provide a soft start supply for the power stages. The LTC3646HMSE#PBF also has a digital power-down mode that can be activated by the host controller to save power when it is not being used.

The LTC3646HMSE#PBF is a high-performance and flexible IC for generating two separate supplies. With its wide input voltage range, adjustable output voltage range, and current mode control, it is perfect for powering a wide range of consumer electronics, peripherals, and other high-current applications.

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