LM2767
SNVS069C –FEBRUARY 2000–REVISED MAY 2013
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Figure 16. Increasing Output Voltage by Cascading Devices
REGULATING VOUT
It is possible to regulate the output of the LM2767 by use of a low dropout regulator (such as LP2980-5.0). The
whole converter is depicted in Figure 17.
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:
2Vin_min >Vout_min +Vdrop_max (LP2980) + Iout_max × Rout_max (LM2767)
2Vin_max < Vout_max +Vdrop_min (LP2980) + Iout_min × Rout_min (LM2767)
(6)
(7)
Figure 17. Generate a Regulated +5V from +3V Input Voltage
8
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