For demanding load requirements, multiple LDOs can be paralleled as indicated in Figure 8-12. In parallel mode, the CS terminal of LDO1 must be connected to the PCL terminal of LDO2 via a series resistor, R_CL, and CS terminal of LDO2 must be connected to PCL terminal of LDO1 via series resistor, R_CL. The typical value of R_CL in parallel operation is 3.75 kΩ for current limit > 6 A. In parallel configuration, R_CL (resistor from PCL to GND) and R_CS (resistor from CS terminal to V_IN) must be left open (unpopulated). The R_CL value must be selected so that the operating condition of the CS terminal is maintained, as specified in Section 6.5. V_CS must be greater than 0.3 V to insure proper current sense operation. The current from PCL through RCL of LDO1 is determined by the output load current of LDO2 divided by the CSR. Hence, the voltage at CS terminal of the LDO1 is 0.605 V – ((output load current of LDO2 + 0.2458) / CSR × R_CL).

Alternately, it can also provide twice the output current to meet system needs. When using two LDOs in parallel operation for higher output load current, use POL TPS50601-SP as an input source.

Figure 8-11 LDO Current Share

Figure 8-12 Block Diagram (Parallel Operation)