1 Features
1• Input Voltage Range (PVIN): 1.5 V to 16 V
• Input Bias Voltage (VDD) Range: 4.5 V to 22 V
• Output Voltage Range: 0.6 V to 5.5 V
• Integrated, 2.9-mΩ and 1.2-mΩ Power MOSFETs
With 40-A Continuous Output Current
• Voltage Reference 0.6 V to 1.2 V in 50-mV Steps
Using VSEL Pin
• ±0.5%, 0.9-VREF Tolerance Range: –40°C to
+125°C Junction Temperature
• True Differential Remote Sense Amplifier
• D-CAP3™ Control Loop
• Adaptive On-Time Control with 8 PMBusTM
Frequency: 315 kHz, 425 kHz, 550 kHz, 650 kHz,
825 kHz, 900 kHz, 1.025 MHz, 1.125 MHz
• Temperature Compensated and Programmable
Current Limit with RILIM and OC Clamp
• Choice of Hiccup or Latch-Off OVP or UVP
• VDD UVLO External Adjustment by Precision EN
• Prebias Start-up Support
• Eco-mode™ and FCCM Selectable
• Full Suite of Fault Protection and PGOOD
• Standard VOUT_COMMAND and
VOUT_MARGIN (HIGH and LOW)
• Pin-Strapping and On-the-Fly Programming
• Fault Reporting and Warning
• NVM Backup for Selected Commands
• 1-MHz PMBus with PEC and SMB_ALRT#
• Create a Custom Design Using the TPS549D22
With the WEBENCH® Power Designer

2 Applications
• Enterprise Storage, SSD, NAS
• Wireless and Wired Communication Infrastructure
• Industrial PCs, Automation, ATE, PLC, Video
Surveillance
• Enterprise Server, Switches, Routers
• ASIC, SoC, FPGA, DSP Core, and I/O Rails

3 Description
The TPS549D22 device is a compact single buck
converter with adaptive on-time, D-CAP3 mode
control. It is designed for high accuracy, high
efficiency, fast transient response, ease-of-use, low
external component count and space-conscious
power systems.
This device features full differential sense, TI
integrated FETs with a high-side on-resistance of
2.9 mΩ and a low-side on-resistance of 1.2 mΩ. The
device also features accurate 0.5%, 0.9-V reference
with an ambient temperature range between –40°C
and +125°C. Competitive features include: very low
external component count, accurate load regulation
and line regulation, auto-skip or FCCM mode
operation, and internal soft-start control.
The TPS549D22 device is available in 7-mm × 5-mm,
40-pin, LQFN-CLIP (RVF) package (RoHs exempt).