The Linear Technology LT3070 (150mV @ 5A) , LT3071, LT1580 , and LT1581 (700 mV @ 10A) are examples:
http://www.linear.com/product/LT1580 For comparison: http://www.linear.com/product/LT1584 The LT1580 (0.8V @ 7A) has the same topology as the LT1584 (1.5V @ 7A) except everything but the pass NPN is powered from a bias supply brought out to a separate pin. If the bias supply is connected to the input supply, then it duplicates the dropout characteristics of the LT1584. On Mon, 27 Feb 2012 22:58:33 -0800, gary <[email protected]> wrote: >I hate to be argumentative, but you can't be low drop out and use an >emitter follower. Draw the circuit and convince yourself. You would need >a high side driver scheme to drive the base/gate, and that require some >sort of boost converter. It can be done on switchmode chips, but not in >a linear circuit. Well unless you ship it with a battery. > >On 2/27/2012 9:51 PM, David wrote: >> The highest performance low dropout regulators I have seen use >> emitter/source followers with a low current bias supply. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
