TPS546B24A

Part: TPS546B24A — Texas Instruments

Type: Synchronous Buck Converter with PMBus

Description: 2.95–18 V input, 20 A synchronous buck converter with integrated FETs, up to 4× stackability for current sharing to 80 A, and PMBus telemetry.

Operating Conditions:

• Supply voltage: 2.95–18 V (VAVIN and VPVIN)
• Operating temperature: -40 to 150 °C (Junction temperature TJ)
• Peak switch node voltage: Up to 18 V

Absolute Maximum Ratings:

• Max supply voltage: 18 V (PVIN), 20 V (AVIN)
• Max junction/storage temperature: 150 °C

Key Specs:

• Input operating current: 12.5 mA typ, 17 mA max (Converter not switching, VPVIN = VAVIN = 12 V)
• AVIN UVLO rising threshold: 2.5 V typ, 2.7 V max
• AVIN UVLO falling threshold: 2.09 V min, 2.3 V typ
• Power input turn-on voltage (VIN_ON): 2.75 V typ (programmable 2.75 to 15.75 V)
• Power input turn-off voltage (VIN_OFF): 2.5 V typ (programmable 2.5 to 15.5 V)
• EN/UVLO rising threshold: 1.05 V typ, 1.1 V max
• EN/UVLO falling threshold: 0.9 V min
• Remote sense input impedance: 85 kΩ min, 130 kΩ typ, 165 kΩ max (VOSNS - GOSNS = 1 V)

Features:

• Split rail support: 2.95-V to 18-V PVIN, 2.95-V to 18-V AVIN
• 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 via pin strap or 0.25-V to 5.5-V using PMBus VOUT_COMMAND
• Differential remote sensing with internal FB divider for < 1% VOUT error from -40°C to +150°C TJ
• PMBus interface with 1-MHz clock support and telemetry for VOUT, IOUT, and internal die temperature
• 12 selectable switching frequencies from 225 kHz to 1.5 MHz

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

Package:

• 40-pin LQFN-CLIP / PQFN (RVF), 7.00 mm × 5.00 mm × 1.5 mm

• Split rail support: 2.95-V to 18-V PVIN; 2.95-V to 18-V AVIN (4-VIN 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 via pin strap or 0.25-V to 5.5-V using PMBus VOUT_COMMAND
• Extensive PMBus command set with telemetry for VOUT, I OUT and internal die temperature
• Differential remote sensing with internal FB divider for < 1% VOUT error -40°C to +150°C TJ
• 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
• Supports strongly coupled inductor
• 7-mm × 5-mm × 1.5-mm, 40-pin QFN, pitch = 0.5 mm
• Create a Custom Design Using the TPS546B24A With WEBENCH ® Power Designer

• 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

Figure 5-1. 40-Pin LQFN-CLIP With Exposed Thermal Pad RVF Package (Top View)

TJ = -40°C to 150°C, VPVIN = VAVIN= 12 V, fSW = 550 kHz; zero power dissipation (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted) (1)

over operating free-air temperature range (unless otherwise noted)

The TPS546B24A is a highly integrated, synchronous step-down DC/DC converter. This device is used to convert a higher DC-input voltage to a lower DC-output voltage, with a maximum output current of for a single device. Use the following design procedures to select key component values for single phase. The appropriate behavioral options can be set through PMBus.