1 Introduction

The original power source for this system can be either a battery or a power supply that is typically between 8 Vin to 18 Vin and capable of delivering about 50 W of power.

This power source is fed to an optional front-end protection (FEP) sub-circuit, controlled by the LM74910 integrated circuit (IC), that acts as a programmable electronic safety switch with numerous safety features.

Following the FEP there exists a LM25148 Buck converter, referred to as the 5V Pre-Regulator, that accepts the higher voltage input, and generates a well-regulated 5V voltage level. This 5V rail, in turn, supplies the main point-of-load (POL) converters, which regulate the various voltages needed to supply the VE2302 device’s many rails. Two TPS6287B25 regulator ICs are used to have a dual-phase converter that supplies the main digital core rail. A variety of TPS62830x variant regulator ICs are used for most of the other rails. The TPS74615 low dropout linear regulator (LDO) is used to supply one of the low-power rails, while the TLV76033 LDO is used to supply an always-ON bias supply, which powers a number of sub-circuits, such as the voltage supervisor and sequencer ICs. If a 3.3V always-ON power supply already exists in the system, then the TLV76033 LDO is not needed.

The TPS389006 multi-rail voltage supervisor IC monitors and communicates that all of the rails are within their respective acceptable voltage levels. The TPS38700S sequencer IC controls the correct desired order of each rail getting enabled upon system turn-ON and disabled during system turn-OFF.

The power design exhibits how the required power rails for the VE2302 device can be powered by TI regulator ICs. This design follows AMD’s Minimum Rails power consolidation of supplies. Please see AMD’s Power Design Manager (PDM) tool for all available power consolidation options. PDM needs to be used when estimating power for any application. This reference design uses example power estimations.