Split Rail Linear Power Supply

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Split rail linear power supply.

The input supply voltage range is suitable for use with lithium ion batteries or from a fixed 3 3 v supply. In a split voltage power supply application the analog circuit is connected between the positive voltage rail and the negative voltage rail. For step by step details see the application report creating a split rail power supply with a wide input voltage buck regulator charge pumps are a popular and easy way of inverting positive rails. Only the ref3318 is available with a 1 8v output so it could be used.

White vinyl 3 rail diamond fence panel with 3 rails post and cap. Figure 2 is a plot of the input current versus the output current for the circuit in figure 1. The positive supply rail is created from a standard off the shelfcoupled inductor from coilcraft. The split rail power supply uses a wide input voltage step downregulator as an inverting power supply to create the negative supply rail.

Each output can supply up to 250 ma of output current. This document outlines a step by stepmethod for designing the split rail power supply. I build up a simple low voltage supply to setup the framework for the l. The tps65133 is designed to supply any system requiring 5 0 v supply rails.

The fly buck method is a more complex technique. Splitting a rail using the voltage reference will often mean compromising a bit on the symmetry of the split for example if a 3v3 rail is to be split then the closest would be to use the 1 8v output reference which gives a 1 8 1 5v asymmetrical supply.