LMS1585A/LMS1587 Linear LDO Regulators Texas Instruments LMS1585A/LMS1587 Linear LDO Regulators are low dropout (LDO) positive regulators with output load current of 5A (LMS1585A) and 3A (LMS1587). The low dropout voltage (1.2V) and fast transient response make these regulators an excellent solution for low voltage microprocessor applications. Each of these devices is available in adjustable versions, which can set the output voltage with only two external resistors. In addition, they are also available in 1.5V and 3.3V fixed voltage versions. The LMS1585A/LMS1587 circuits include a zener trimmed bandgap reference, current limiting, and thermal shutdown.