TPS546B25中文资料4V to 18V input, 25A, stackable, PMBus synchronous step-down converter数据手册TI规格书

描述 Description

The TPS546B25 device is a highly-integrated buck converter with D-CAP4 control topology for fast transient response. All programmable parameters can be configured by the PMBus interface and stored in NVM as the new default values to minimize the external component count. Pin-strap options allow for configuration as primary or secondary, stack position and stack number, DCM (single phase only) or FCCM, overcurrent limit, fault response, internal or external feedback resistor, output voltage selection or range, switching frequency, and compensation.

The PMBus interface with 1MHz clock support gives a convenient, standardized, digital interface for configuration as well as telemetry 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. Two, three, and four TPS546B25 devices can be interconnected to provide up to 100A on a single output.

The TPS546B25 has an option to overdrive the internal 4.5V LDO with an external 5V supply through the VDRV and VCC pins to improve efficiency, reduce power dissipation, and enable start-up with a lower input voltage.

The TPS546B25 is a lead-free device and is RoHS compliant without exemption.

特性 Features

• 2.7V to 18V input voltage with external bias
• 0.4V to 5.5V output voltage
• Rdson_HS = 2.6mΩ, Rdson_LS = 1mΩ
• PMBus programmable
• Input voltage, output voltage, output current, temperature telemetry
• Includes single command write function in stacked configuration
• Non-volatile memory to store configuration settings
• Two methods for programming the output voltage
• External resistor divider (continuous settings) with boot-up voltage selected by VBOOT
• Precision voltage reference and differential remote sense for high output accuracy
• ± 0.85% VOUT tolerance from –40°C to 125°C junction
• Selectable FCCM/DCM in single phase only
• Safe start-up into prebiased output
• D-CAP4 control topology with fast transient response, supporting all ceramic output capacitors
• Selectable cycle-by-cycle valley current limit
• Open-drain power-good output