1 Features

• Integrated extended security feature

• Split rail support: 2.95-V to 18-V PVIN; 2.95-V to

18-V AVIN (4-VIN VDD5 for switching)

• Integrated 5.5-mΩ/1.8-mΩ MOSFETs

• Average current mode control with selectable

internal compensation

• 2 ×, 3 ×, 4 × stackable with current sharing up to

80 A, supporting a single address per output

• Selectable 0.5-V to 5.5-V output through

pin strap or 0.25-V to 5.5-V using PMBus

VOUT_COMMAND

• Extensive PMBus command set with telemetry for

VOUT, IOUT, and internal die temperature

• Differential remote sensing with an internal FB

divider for < 1 VOUT error, –40°C to +150°C TJ

• AVS and margining capabilities through PMBus

• MSEL pins pin programming PMBus defaults

• 12 selectable switching frequencies from 225 kHz

to 1.5 MHz (8 pin strap options)

• Frequency sync in, sync out

• Supports prebiased output

• 7-mm × 5-mm × 1.5-mm, 40-pin QFN

• Drop-in compatible with TPS546B24A

• Create a Custom Design Using the TPS546B24S

with WEBENCH® Power Designer

2 Applications

• Data center switches, rack servers

• Active antenna system, remote radio and

baseband unit

• Automated test equipment, CT, PET, and MRI

• ASIC, SoC, FPGA, DSP core, and I/O voltage

3 Description

The TPS546B24S is a highly integrated, non-isolated

DC/DC converter that expands on the TPS546B24A

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.

TPS546B24S is capable of high frequency operation

and 20-A current output from a 7-mm × 5-mm

package. Two, three, and four TPS546B24S devices

can be interconnected to provide up to 80 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 TPS546B24S 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

TPS546B24S 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.