1 Features
1• Internally-Compensated Advanced Current Mode
Control 25-A POL
• Input Voltage Range: 4 V to 19 V
• Output Voltage Range: 0.6 V to 5.5 V
• Integrated 4.1/1.9-mΩ Stacked NexFET™ Power
Stage With Lossless Low-Side Current Sensing
• Fixed Frequency - Synchronization to an External
Clock and/or Sync Out
• Pin Strapping Programmable Switching Frequency
– 300 kHz to 2 MHz for Standalone
– 300 kHz to 1 MHz for Stackable
• Stack 2× for up to 50 A With Current Share,
Voltage Share, and CLK Sync
• Pin Strapping Programmable Reference from 0.6
V to 1.1 V With 0.5% Accuracy
• Differential Remote Sensing
• Safe Start-Up into Prebiased Output
• High-Accuracy Hiccup Current Limit
• Asynchronous Pulse Injection (API) and Body
Braking
• 40-pin, 5-mm × 7-mm LQFN Package with 0.5-
mm Pitch and Single Thermal Pad
• Create a Custom Design Using the TPS543B20
With the WEBENCH® Power Designer

2 Applications
• Wireless and Wired Communications
Infrastructure Equipment
• Enterprise Servers, Switches, and Routers
• Enterprise Storage, SSD
• ASIC, SoC, FPGA, DSP Core, and I/O Rails

3 Description
The TPS543B20 employs an internally compensated
emulated peak-current-mode control, with a clock
synchronizable, fixed-frequency modulator for EMIsensitive
POL. The internal integrator and directly
amplifying ramp tracking loop eliminate the need for
external compensation over a wide range of
frequencies thereby making the system design
flexible, dense, and simple. Optional API and body
braking help improve transient performance by
significantly reducing undershoot and overshoot,
respectively. Integrated NexFET™ MOSFETs with
low-loss switching facilitate high efficiency and deliver
up to 25 A in a 5-mm × 7-mm PowerStack™ package
with a layout friendly thermal pad. Two TPS543B20
devices can be stacked together to provide up to 50-
A point-of-load.