DC/DC converter enables broad range of topologies

April 15, 2014 // By Christoph Hammerschmidt
Linear Technology's LT8471 facilitate step-down, step-up, and inverting conversions by providing two internal 2A, 50V switches and an additional 500mA switch. This broad range of topologies and output configurations makes it ideal for a wide range of industrial and automotive applications.

The LT8471 operates from an input voltage range of 2.6V to 50V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive batteries.

The 50V internal switches accommodate applications with inputs and outputs as high as 45V. The device is capable of generating both positive and negative outputs from a single converter, making it ideal for a wide array of biasing applications. A small integrated 500mA boost converter facilitates both buck and single inductor inverting applications at optimal efficiencies. The LT8471's switching frequency is programmable and synchronizable from 100kHz to 2MHz, which keeps externals very small. The combination of a TSSOP package and tiny externals ensures a very compact footprint while minimizing solution cost.

The LT8471 provides overall efficiencies up to 85% for buck and inverting applications. From a 6V to 32V input, the LT8471 delivers up to 1.5A at 5V and 650mA at -5V. A power good pin on each channel is offered for ease of use when event-based sequencing is required. The switching frequency can be programmed via a single resistor or synchronized to an external clock between 100kHz and 2MHz, minimizing external component size and avoiding “noise critical” frequency bands. Anti-phase switching minimizes input ripple. Undervoltage and overvoltage lockout (UVLO/OVLO) is user adjustable for optimal system performance. Other features include external synchronization capability, soft-start and frequency foldback.

For more information, visit www.linear.com/product/LT8471