1 Features
• 4-V to 16-V input voltage range
• 3.13-V to 5.3-V external VCC bias support
• 5.8-mΩ and 2.3-mΩ MOSFETs (VVCC = 3.3 V)
• 25-A continuous output current
• Optimized 16-pin VQFN-HR package for efficiency
and thermal performance
• ±0.5% reference (VREF) for TJ = –40°C to +125°C
• VREF to 5.5-V output voltage range
• Differential remote sense
• D-CAP4 with ultra fast load-step response
• Supports all ceramic output capacitors
• Selectable Auto-skip Eco-mode for high light-load
efficiency
• Programmable current limit with RILIM
• Selectable switching frequency:
800 kHz, 1.1 MHz, 1.4 MHz
• Programmable soft-start time
• Prebiased start-up capability
• Open-drain power-good output
• Valley overcurrent limit protection
• Overvoltage and undervoltage fault protection

2 Applications
• Rack server and blade server
• Hardware accelerator and add-in cards
• Data center switches
• Industrial PC
• Baseband unit (BBU)

3 Description
The TPS54KB2x device is a small, high-efficiency,
synchronous buck converter with an adaptive ontime
D-CAP4 control mode. The control method
provides low minimum on-time and fast load-transient
response across the entire output voltage range
without requiring an external compensation network.
Because external compensation is not required, the
device is easy to use and requires few external
components. The device is well-designed for spaceconstrained
data center applications.
The TPS54KB2x device has differential remote sense,
high-performance integrated MOSFETs, and an
accurate ±0.5% reference over the specified operating
junction temperature range. The device features
accurate load regulation and line regulation, Ecomode
or FCCM operation, programmable settings
through the MSEL pin and programmable soft-start.
The TPS54KB2x device is a lead-free device. The
device is RoHS compliant without exemption.