1 Features
• 4V to 16V input voltage range without external bias
• 2.7V to 16V input voltage range with external bias
• 3.1V to 4.3V external VCC bias support
• 8.4mΩ and 3.3mΩ MOSFETs (VVCC = 3.3V)
• 20A continuous output current
• Optimized 19-pin WQFN-HR package for efficiency
and thermal performance
• ±1.25% output voltage accuracy with internal
feedback, TJ = –40°C to +150°C
• 0.4V to 5.5V output voltage range
• Differential remote sense
• D-CAP4 with ultra-fast load-step response
• User programmable NVM
• Supports all ceramic output capacitors
• Selectable auto-skip Eco-mode for high light-load
efficiency
• Programmable valley current limit
• 500kHz, 600kHz, 800kHz, 1.0MHz, 1.2MHz,
1.4MHz selectable switching frequency
• Programmable soft-start time
• Prebiased start-up capability
• Open-drain power-good output
• Overvoltage and undervoltage fault protection
• 3mm × 3mm (0.4mm pin pitch) and 3mm × 3.5mm
(0.5 pin pitch) 19-pin QFN packages
• Pin-to-pin compatible with 12A TPS544A28 and
6A TPS544628

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

3 Description
The TPS544B28 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.
The TPS544B28 device has differential remote
sense, high-performance integrated MOSFETs, and
supports ±1.25% output voltage accuracy with internal
reference. The device features accurate load and
line regulation and Eco-mode or Forced Continuous
Conduction Mode (FCCM) operation.
The PMBus® interface with 1MHz clock support
gives a convenient, standardized digital interface for
device configuration as well as output voltage, output
current, and die temperature telemetry. Pin strap
options allow for the configuration of the overcurrent
limit, fault response, internal or external feedback,
output voltage selection, switching frequency, and
compensation. Internal NVM is also available to store
a variety of the PMBus parameters.
The TPS544B28 device is a lead-free device. The
device is RoHS compliant without exemption.