Dual Multi-Topology DC-DCs Come With 2-A, 50-V Internal Switches
Linear Technology’s LT8471 dual dc-dc converter employs two internal 2-A, 50-V switches plus 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 (inverse SEPIC), or inverting dc-dc converter. The device can generate both positive and negative outputs from a single converter. Its 2.6- to 50-V input voltage suits applications with input sources ranging from a single-cell lithium-ion battery to automotive batteries, while the 50-V internal switches accommodate applications with inputs and outputs up to 45 V. There’s also a small integrated 500-mA boost converter. Switching frequency is programmable and synchronizable from 100 kHz to 2 MHz. Overall efficiencies reach 85% for buck and inverting applications. From a 6- to 32-V input, the LT8471 delivers up to 1.5 A at 5 V and 650 mA at ‒5 V. Anti-phase switching minimizes input ripple. The converter comes in a 20-lead, thermally enhanced TSSOP package.