TPS546D24SRVFR

The TPS546D24S is a highly integrated, non-isolated DC/DC converter that expands on the TPS546D24A 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. TPS546D24S is capable of high frequency operation and 40-A current output from a 7-mm x 5-mm package. Two, three, and four TPS546D24S devices can be interconnected to provide up to 160 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 TPS546D24S 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 TPS546D24S 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.

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

Key features

• Integrated extended security feature
• Split rail support: 2.95-V to 16-V PVIN; 2.95-V to 18-V AVIN (4-V1N VDD5 for switching)
• Integrated 4.5-mΩ/0.9-mΩ MOSFETs
• Average current mode control with selectable internal compensation
• 2x, 3x, 4x stackable with current sharing up to 160 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 x 5-mm x 1.5-mm, 40-pin QFN
• Drop-in compatible with TPS546D24A
• Create a Custom Design Using the TPS546D24S with WEBENCH Power Designer