1 Features
1• Input Voltage Range: 4.5 V to 14 V
• 4-Bit Dynamic VID-On-The-Fly Support
• VID Programmable Output Voltage with
Programmable Transition Rate
• Fixed Switching Frequency of 520 kHz
• Selectable Low-Side (Three Settings) and Fixed
High-Side Thermally Compensated Overcurrent
Protection
• Power Good Indicator
• Internal 5-V Regulator
• Voltage Mode Control
• Internally Fixed 5.5-ms Soft-Start Time
• Prebias Output Safe
• Thermal Shutdown at 140°C
• 16-Pin QFN Package

2 Applications
• Smart-Reflex™ DSPs
• POL Modules
• Telecom

3 Description
The TPS40197 is a synchronous buck controller that
operates from 4.5 V to 14 V input supply nominally.
The controller implements voltage-mode control
architecture with the switching frequency fixed at
520 kHz. The higher switching frequency facilitates
the use of smaller inductor and output capacitors,
thereby providing a compact power-supply solution.
An adaptive anti-cross conduction scheme is used to
prevent shoot through current in the power FETs.
The TPS40197 integrates the PWM control and 4-bit
VID interface in a single chip to allow seamless onthe-
fly VID changes with programmable transition
rate. It provides a simple power solution for Smart-
Reflex™ DSP cores.