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Dual Multi-Topology DC/DC Converters

Dual Multi-Topology DC/DC Converters

Linear Technology Corp. announces the LT8471, a dual DC/DC converter that utilizes two internal 2 A, 50 V switches and an additional 500 mA switch to facilitate step-down, step-up, and inverting conversions. Each 2 A channel can be independently configured as a buck, boost, SEPIC, flyback, ZETA or inverting DC/DC converter. 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 2.6 V to 50 V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive batteries.

The LT8471’s 50V internal switches can accommodate applications with inputs and outputs as high as 45 V. 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 500 mA boost converter facilitates both buck and single inductor inverting applications at optimal efficiencies. The LT8471’s switching frequency is programmable and synchronizable from 100 kHz to 2 MHz, 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’s high efficiency 50 V switches deliver overall efficiencies up to 85% for buck and inverting applications. From a 6 V to 32 V input, the LT8471 delivers up to 1.5 A at 5 V and 650 mA at -5 V. A power good pin on each channel is offered for ease of use when event-based sequencing is required. The LT8471’s switching frequency can be programmed via a single resistor or synchronized to an external clock between 100 kHz and 2 MHz, 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.

The LT8471EFE is available in a 20-lead, thermally enhanced TSSOPpackage, priced at $3.75 each for 1,000 piece quantities. An industrial temperature (-40 °C to 125 °C) version, the LT8471IFE, is priced at $4.13 each for 1,000 piece quantities. Both versions are available from stock.

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