TLV767: Current Boost Circuit

Hi Lawrence,

You can use parallel LDO's to meet this spec. As this LDO does not have an external NR/SS pin, you cannot tie the references together thus the ballast resistor technique may produce large value ballast resistors making this undesired.  You would then wish to pursue the current sense + op-amp technique, however we do not have a reference design readily available for this LDO so you'll need to review this on your own.  The technique is shown in this reference design (using a different LDO) and based on your load and the TLV767, you'll need 10 TLV767 and 9 op-amps for this approach.

https://www.ti.com/lit/ug/tidu421/tidu421.pdf

Another option is something like this circuit which increases current while simultaneously spreads the heat.  You may be able to use a PMOS instead of a PNP, such as the SiA427ADJ but you'll have to confirm abs max ratings such as Vds (if you tie EN to Vin then it's possible that your system will never violate the 8V abs max spec but that's for you to review).  You may need more than 1 transistor (due to the limited Vgs available).  Another option is the second circuit where you combine NPN and PNP (or NMOS and PMOS) transistors to increase the load current, if you cannot locate a PNP (PMOS) that will sufficiently handle the current.

Thanks,

Stephen

Hi Lawrence,

We would like additional insight into this application.  What is the input voltage and what are they powering?  We would be interested to know what the need is for 10A.  If you would like to connect me directly with the customer, that is fine too.

Thanks,

Stephen