2.95-V to 16-V stackable 10-A synchronous SWIFT™ step-down PMBus converter with extended security

The TPS546A24S is a

highly integrated, non-isolated DC/DC converter that expands on the TPS546A24A by adding manufacturer-specific PMBus commands and Extended Write Protect

and Passkey. This feature improves security against malicious access to the PMBus by

restricting Write capability with greater resolution than the standard Write Protect

command. TPS546A24S is capable of high frequency operation and

10-A current

output from a 7-mm × 5-mm package. Two, three, and four TPS546A24S devices can be interconnected to provide up to 40 A on a

single output. The device has an option to overdrive the internal 5-V LDO with an external

5-V supply through the VDD5 pin to improve efficiency and reduce power dissipation of the

converter.

The TPS546A24S 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 1-MHz clock support

gives a convenient, standardized digital interface for

converter configuration as well as monitoring of key

parameters including 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 TPS546A24S

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.