TI TPSM846C23 35A PMBus Step-Down Power Module

TI TPSM846C23 35A PMBus Power Module

The Texas Instruments TPSM846C23 is a 35A, PMBus-compliant synchronous buck power module designed for high-current point-of-load (POL) applications. It supports a 4.5V to 15V input range and an adjustable output from 0.35V to 2.0V.

The module integrates the controller, power MOSFETs, inductor and associated components into a compact 15 × 16mm package. Its PMBus interface supports power configuration, fault monitoring and voltage, current and temperature telemetry. Two TPSM846C23 modules can be configured in parallel to deliver up to 70A with current sharing.

TPSM846C23 Key Specifications

Note: Maximum output current depends on input voltage, output voltage, switching frequency, ambient temperature and thermal conditions. Consult TI's derating curves before designing for continuous 35A operation.

TPSM846C23 Ordering Part Numbers

Both orderable numbers are listed as active by TI. The manufacturer identifies TPSM846C23MOLR.A as an identical ordering variant. Confirm the accepted orderable number, packaging, quantity and current availability before purchasing.

35A Single-Module vs 70A Parallel Operation

A single TPSM846C23 provides up to 35A output current. For applications requiring higher current, two modules can be configured as a two-phase power solution with current sharing, providing up to 70A total output capability.

Parallel operation requires more than connecting two output terminals together. The modules must be configured using TI's recommended current-sharing architecture.

Engineers should verify:

• Current sharing: Follow the manufacturer's two-phase configuration and current-balance requirements.

• Phase interleaving: Configure the switching phases as specified to support ripple-current management.

• Output voltage: Ensure both modules operate with compatible output settings and control configuration.

• Protection: Coordinate overcurrent, startup and fault-response settings.

• Thermal performance: Evaluate airflow, PCB copper area and module temperature at the required load.

For evaluation, TI provides the TPSM846C23DEVM-807 two-phase development board supporting output currents up to 70A.

PMBus Telemetry and Power Management

The TPSM846C23 supports PMBus-based configuration and monitoring of key power regulator functions.

The interface can report output voltage, output current and device temperature. It also supports programmable output voltage, undervoltage lockout, soft start, soft stop, overcurrent response and thermal fault handling.

The module supports SMBus communication rates of 100kHz and 400kHz and implements a subset of PMBus 1.3 commands.

For digital power system integration, engineers should confirm PMBus addresses, supported commands and nonvolatile configuration requirements. Configuration changes must be saved using the appropriate supported commands when persistent settings are required.

Output Accuracy, Remote Sense and Thermal Design

The TPSM846C23 features differential remote sensing to help compensate for voltage drops between the power module and the load.

This is particularly important for low-voltage FPGA and processor rails, where PCB trace resistance can cause a significant percentage of the target output voltage to be lost.

For example, at 35A, only 1mΩ of path resistance produces approximately 35mV of voltage drop.

When designing the PCB:

• Place input and output capacitors according to TI's reference layout.

• Route remote-sense connections carefully to the intended load point.

• Provide adequate copper area and thermal vias for heat dissipation.

• Verify output voltage ripple and transient response under load changes.

• Use the datasheet thermal curves to assess continuous output current capability.

The integrated power stage and inductor reduce external component count, but input/output capacitors and required configuration components must still be selected for the actual application.

TPSM846C23 vs TPSM846C24

The TPSM846C23 and TPSM846C24 are pin-compatible 35A power modules, but they provide different control capabilities.

Choose TPSM846C23 when PMBus configuration, telemetry or output voltages below 0.5V are required. The TPSM846C24 may suit applications that do not require PMBus functionality.

Pin compatibility does not guarantee a direct functional replacement. Verify control connections, output configuration, power sequencing and the complete PCB design before substituting either device.

Typical Applications

• FPGA and DSP core power supplies

• Server and high-performance computing POL converters

• PCIe and communication infrastructure equipment

• Automated test and measurement systems

• Low-voltage, high-current digital power rails

Datasheet and Manufacturer Resources

• TI TPSM846C23 Official Product Page

• TPSM846C23 Datasheet (PDF)

• TPSM846C24 Non-PMBus Power Module

• TPSM846C23 35A Evaluation Module

• TPSM846C23 70A Two-Phase Evaluation Module

For other integrated power-module options, see the TI Power Modules and Integrated Inductors product category at DataStorageIC.

TPSM846C23 Pricing and Availability

Looking for TI TPSM846C23MOLR or TPSM846C23MOLR.A pricing, stock availability and lead time?

Contact DataStorageIC with your complete part number, required quantity, target output voltage, output current and delivery destination. Our team can assist with sourcing, specification verification and quotation requests.