Datasheet

LM2665
www.ti.com SNVS009F –NOVEMBER 1999–REVISED MAY 2013
Figure 15. Increasing Output Voltage by Cascading Devices
REGULATING V
OUT
It is possible to regulate the output of the LM2665 by use of a low dropout regulator (such as LP2980-5.0). The
whole converter is depicted in Figure 16.
A different output voltage is possible by use of LP2980-3.3, LP2980-3.0, or LP2980-adj.
Note that, the following conditions must be satisfied simultaneously for worst case design:
2V
in_min
>V
out_min
+V
drop_max
(LP2980) + I
out_max
× R
out_max
(LM2665) (6)
2V
in_max
< V
out_max
+V
drop_min
(LP2980) + I
out_min
× R
out_min
(LM2665) (7)
Figure 16. Generate a Regulated +5V from +3V Input Voltage
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