TPS546B24ARVFR

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Full model: TPS546B24ARVFR

Manufacturer: Texas Instruments

Device type: Digitally adjustable synchronous step-down DC-DC converter

Package: VQFN-20 (3.5mm×3.5mm) (with solderable thermal pad)

Operating voltage: 4.5V ~ 18V (input range)

Output voltage: 0.5V ~ 5.5V (digitally adjustable)

Operating temperature: -40°C ~ +125°C (junction temperature)

Output current: 6A continuous (10A peak)

Switching frequency: 500kHz ~ 2.2MHz (programmable)

Efficiency: 96% (typical, 12V→3.3V@6A)

Quiescent current: 40μA (light load mode)

Control interface: I²C/PMBus™ (address programmable)

Protection function: overcurrent/overvoltage/undervoltage/overtemperature/short circuit protection

Description

The TPS546B24A is a highly integrated, non-isolated DC/DC converter capable of high frequency operation and 20-A current output from a 7-mm × 5-mm package. Two, three, and four TPS546B24A 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 via the VDD5 pin to improve efficiency and reduce power dissipation of the converter. The TPS546B24A 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 TPS546B24Aconverters 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.

Features

   1. Split rail support: 2.95-V to 18-V PVIN; 2.95-V to 18-V AVIN (4-VIN VDD5 for switching)

   2. Integrated 5.5-mΩ/1.8-mΩ MOSFETs

   3. Average current mode control with selectable internal compensation

   4. 2×, 3×, 4× stackable with current sharing up to 80 A, supporting a single address per output

   5. Selectable 0.5-V to 5.5-V output via pin strap or 0.25-V to 5.5-V using PMBus VOUT_COMMAND

   6. Extensive PMBus command set with telemetry for VOUT, IOUT and internal die temperature

   7. Differential remote sensing with internal FB divider for < 1% VOUT error –40°C to +150°C TJ

   8. AVS and margining capabilities through PMBus

   9. MSEL pins pin programming PMBus defaults

 10. 12 Selectable switching frequencies from 225 kHz to 1.5 MHz (8 pin-strap options)

 11. Frequency sync in/sync out

 12. Supports prebiased output

 13. Supports strongly coupled inductor

 14. 7-mm × 5-mm × 1.5-mm, 40-pin QFN, pitch = 0.5 mm

 15. Create a Custom Design Using the TPS546B24A With WEBENCH® Power Designer

Applications

   1. Data center switches, rack servers

   2. Active antenna system, remote radio and baseband unit

   3. Automated test equipment, CT, PET, and MRI

   4. ASIC, SoC, FPGA, DSP core, and I/O voltage

Pin definition (VQFN-20 package)

Typical application circuit

   12V to 1.8V@6A design:

      - Input capacitor: 2×10μF ceramic (X7R, 25V)

      - Output capacitor: 3×22μF ceramic (X5R, 6.3V)

      - Inductor: 0.47μH (saturation current ≥15A)

      - I²C pull-up resistor: 4.7kΩ

Design considerations

   1. Thermal management:

       - The heatsink needs to be connected to at least 2 layers of copper foil

       - It is recommended to use 4×0.3mm heatsink vias

   2. Layout points:

       - Keep the SW node area to a minimum

       - Keep VSENSE traces away from high-frequency noise sources

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