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http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps546b24a”>View Datasheet
Texas Instruments TPS546B24A Up To 4x Stackable PMBus Buck Converter is a highly integrated, non-isolated DC/DC converter capable of high-frequency operation and 20A current output from a 7mm × 5mm package. Two, three, and four TPS546B24A devices can be interconnected to provide up to 80A on a single-output. The device has an option to overdrive the internal 5V LDO with an external 5V supply via the VDD5 pin to improve efficiency and reduce the power dissipation of the converter. The Texas Instruments TPS546B24A uses a proprietary fixed-frequency current-mode control with input feedforward and selectable internal compensation components for minimal size and stability over a wide range of output capacitances.
The PMBus interface with 1MHz clock support gives a convenient, standardized digital interface for converter configuration as well as monitoring of key parameters. These parameters include output voltage, output current, and internal die temperature. Response to fault conditions can be set to restart, latch off, or ignore, depending on system requirements. Back-channel communication between stacked devices enables all TPS546B24A converters powering a single output rail to share a single address to simplify system software/firmware design. Key parameters including output voltage, switching frequency, soft-start time, and overcurrent fault limits can also be configured through BOM selection without PMBus communication to support program free power-up.
