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Texas Instruments TPS546A24S Synchronous SWIFT™ Step Down Converter

Texas Instruments TPS546A24S Synchronous SWIFT™ Step-Down Converter is a highly integrated, non-isolated DC/DC converter with PMBus^® and extended Write protection. This step-down converter offers a 2.95V to 18V input voltage range, 12 selectable switching frequencies ranging from 225kHz to 1.5MHz, and a 10A output current. The TPS546A24S converter can provide up to 40A on a single output if interconnected with two, three, and four other TPS546A24S converters. This step-down converter integrates 5.5mΩ/1.8mΩ MOSFETs and selectable 0.5V to 5.5V output through pin strap or 0.25V to 5.5V using PMBus VOUT_COMMAND. The TPS546A24S converter uses a proprietary fixed-frequency current-mode control with input feedforward and selectable internal compensation components for minimal size and stability. Typical applications include data center switches, rack servers, active antenna systems, remote radios, baseband units, automated test equipment, CT, PET, and MRI.

The TPS546A24S converter expands on the TPS546A24A buck converter by adding manufacturer-specific PMBus commands and extended Write protect and Passkey. This feature enhances security against malicious access to the PMBus by restricting Write capability with better resolution than the standard Write Protect command.

Features

Integrated extended security feature
Split rail support:
- 2.95V to 18V PVIN
- 2.95V to 18V AVIN (4V_IN VDD5 for switching)
Integrated 5.5mΩ/1.8mΩ MOSFETs
Average current mode control with selectable internal compensation
2x, 3x, and 4x stackable with current sharing up to 40A, supporting a single address per output
Selectable 0.5V to 5.5V output through pin strap or 0.25V to 5.5V using PMBus VOUT_COMMAND
Extensive PMBus command set with telemetry for V_OUT, I_OUT, and internal die temperature
Differential remote sensing with an internal FB divider for <1% V_OUT error and -40°C to 150°C T_J

AVS and margining capabilities through PMBus
MSEL pins pin programming PMBus defaults
12 selectable switching frequencies from 225kHz to 1.5MHz (8-pin strap options)
Frequency sync in and sync out
Supports pre-biased output
7mm x 5mm x 1.5mm, 40-pin QFN package dimensions
Drop-in compatible with TPS546A24A

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

Texas Instruments TPS546A24S Synchronous SWIFT™ Step Down Converter

Features

Applications

Typical Application Diagram

Functional Block Diagram

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