TPS61299EVM-103 User Guide

1 TPS61299EVM-103 Evaluation Module

This user's guide describes the schematic, layout, bill of materials (BOM), and setup of the evaluation module (EVM) for the TPS61299, which outputs a fixed 5 V in a WCSP package. The input voltage of the EVM is from 0.7 V to 5.5 V. The output current mainly depends on the input voltage, because the inductor peak current is limited at typical 1.2 A. The EVM supports typical 0.8A from a 3.6-V input voltage.

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1 Schematic

Figure 1-1 shows the schematic of the TPS61299EVM-103. Use a jumper cap on J5 to connect different resistors for different output voltages (refer to Top Layer of TPS61299EVM-103 for more details). The tantalum capacitor, C3, is used to stabilize the input voltage for the TPS61299, in case the cable between the power supply and the EVM is too long. In most applications, the tantalum capacitor is unnecessary. The definition of the connectors is explained as follows:

PIN 1 and PIN 2 of J1 are used for the ground of the input power supply.
PIN 5 and PIN 6 of J1 are used for the positive input of the power supply.
PIN 3 and PIN 4 of J1 are used to sense the input voltage closed to the IC (see the PCB).
PIN 1 and PIN 2 of J4 are used for the negative input of the load.
PIN 5 and PIN 6 of J4 are used for the positive input of the load.
PIN 3 and PIN 4 of J4 are used to measure the output voltage closed to the IC (see the PCB).
JP2 is used to enable or disable the IC through the EN pin.
JP3 is used to connect AVIN to the input rail or external aux input.
JP5 is used to select different output voltage with a jumper cap.

Figure 1-1 TPS61299EVM-103 Schematic