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TPS546B24S

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2.95-V to 16-V stackable 20-A synchronous SWIFT™ step-down PMBus converter with extended security

Product details

Rating Catalog Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 20 Vin (min) (V) 2.95 Vin (max) (V) 16 Switching frequency (min) (kHz) 225 Switching frequency (max) (kHz) 1500 Features Adaptive/Dynamic Voltage Scaling, Adjustable current limit, Differential Remote Sense, Enable, Forced PWM, Frequency synchronization, I2C/PMBus, Over Current Protection, Phase Interleaving, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, UVLO adjustable, Voltage Margining Control mode current mode Vout (min) (V) 0.25 Vout (max) (V) 5.5 Iq (typ) (µA) 9000 Duty cycle (max) (%) 85
Rating Catalog Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 20 Vin (min) (V) 2.95 Vin (max) (V) 16 Switching frequency (min) (kHz) 225 Switching frequency (max) (kHz) 1500 Features Adaptive/Dynamic Voltage Scaling, Adjustable current limit, Differential Remote Sense, Enable, Forced PWM, Frequency synchronization, I2C/PMBus, Over Current Protection, Phase Interleaving, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, UVLO adjustable, Voltage Margining Control mode current mode Vout (min) (V) 0.25 Vout (max) (V) 5.5 Iq (typ) (µA) 9000 Duty cycle (max) (%) 85
LQFN-CLIP (RVF) 40 35 mm² 7 x 5
  • Integrated extended security feature
  • Split rail support: 2.95-V to 18-V PVIN; 2.95-V to 18-V AVIN (4-V IN VDD5 for switching)
  • Integrated 5.5-mΩ/1.8-mΩ MOSFETs
  • Average current mode control with selectable internal compensation
  • 2 ×, 3 ×, 4 × stackable with current sharing up to 80 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 V OUT, I OUT, and internal die temperature
  • Differential remote sensing with an internal FB divider for < 1% V OUT 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 225 kHz to 1.5 MHz (8 pin strap options)
  • Frequency sync in, sync out
  • Supports prebiased output
  • 7-mm × 5-mm × 1.5-mm, 40-pin QFN
  • Drop-in compatible with TPS546B24A
  • Create a Custom Design Using the TPS546B24S with WEBENCH Power Designer
  • Integrated extended security feature
  • Split rail support: 2.95-V to 18-V PVIN; 2.95-V to 18-V AVIN (4-V IN VDD5 for switching)
  • Integrated 5.5-mΩ/1.8-mΩ MOSFETs
  • Average current mode control with selectable internal compensation
  • 2 ×, 3 ×, 4 × stackable with current sharing up to 80 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 V OUT, I OUT, and internal die temperature
  • Differential remote sensing with an internal FB divider for < 1% V OUT 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 225 kHz to 1.5 MHz (8 pin strap options)
  • Frequency sync in, sync out
  • Supports prebiased output
  • 7-mm × 5-mm × 1.5-mm, 40-pin QFN
  • Drop-in compatible with TPS546B24A
  • Create a Custom Design Using the TPS546B24S with WEBENCH Power Designer

The TPS546B24S is a highly integrated, non-isolated DC/DC converter that expands on the TPS546B24A 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. TPS546B24S is capable of high frequency operation and 20-A current output from a 7-mm × 5-mm package. Two, three, and four TPS546B24S devices can be interconnected to provide up to 80 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 TPS546B24S 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 TPS546B24S 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.

The TPS546B24S is a highly integrated, non-isolated DC/DC converter that expands on the TPS546B24A 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. TPS546B24S is capable of high frequency operation and 20-A current output from a 7-mm × 5-mm package. Two, three, and four TPS546B24S devices can be interconnected to provide up to 80 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 TPS546B24S 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 TPS546B24S 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.

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Technical documentation

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* Data sheet TPS546B24S2.95-V to18-V,20-A, Up to 4 × Stackable, SynchronousSWIFTStep-Down Converter withPMBusand Extended Write Protection datasheet PDF | HTML 14 Nov 2023
Application brief Using the Security Features Inside the TPS546x24S Family of Step-Down Converters and Modules (Rev. A) PDF | HTML 26 Feb 2024
Certificate TPS546B24SEVM-1PH EU Declaration of Conformity (DoC) 14 Jun 2023
Certificate TPS546B24SEVM-2PH EU Declaration of Conformity (DoC) 13 Jun 2023

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Evaluation board

TPS546D24SEVM-2PH — TPS546D24S evaluation module fixed frequency synchronous buck converter 2-phase with write lock

The TPS546D24SEVM-2PH evaluation module (EVM) is a 2-phase buck converter with two TPS546D24S devices providing a single 0.8 V output. The TPS546D24A device is a stackable synchronous buck converter with PMBus interface that can operate from a nominal 2.95 V to 16 V input supply. The device allows (...)
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