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Texas Instruments TPS546B24S Synchronous SWIFT™ Step Down Converter

Texas Instruments TPS546B24S Synchronous SWIFT™ Step Down Converter is a highly integrated, up to 4x stackable, and 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 20A output current. The TPS546B24S converter can provide up to 80A on a single output if interconnected with two, three, and four other TPS546B24S converters. This step-down converter features integrated 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 TPS546B24S converter uses a proprietary fixed-frequency current-mode control with input feedforward and selectable internal compensation components for minimal size and stability.

The TPS546B24S converter expands on the TPS546B24A 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. Typical applications include data center switches, rack servers, active antenna systems, remote radio, baseband units, automated test equipment, CT, PET, and MRI.

Features

2.95V to 18V PVIN; 2.95V to 18V AV_IN (4V_IN VDD5 for switching) split rail support
Integrated 5.5mΩ/1.8mΩ MOSFETs
Average current mode control with selectable internal compensation
2 × 3 × 4 × stackable with current sharing up to 80A, 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% VOUT error, -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, sync out
Supports pre-biased output
7mm × 5mm × 1.5mm, 40-pin QFN
Drop-in compatible with TPS546B24A

Applications

Data center switches and 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 TPS546B24S Synchronous SWIFT™ Step Down Converter

Features

Applications

Function Block Diagram

Application Diagram

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