Datasheet

Device description L6730 - L6730B
16/52 Doc ID 11938 Rev 3
5.4 Internal and external references
It is possible to set two internal references, 0.6 V and 1.2 V, or provide an external reference
from 0 V to 2.5 V. The maximum value of the external reference depends on the V
CC
: with
V
CC
= 4 V the clamp operates at about 2 V (typ.), while with V
CC
greater than 5 V the
maximum external reference is 2.5 V (typ).
● V
EAREF
from 0% to 80% of V
CCDR
−> External reference
● V
EAREF
from 80% to 95% of V
CCDR
−> V
REF
= 1.2 V
● V
EAREF
from 95% to 100% of V
CCDR
−> V
REF
= 0.6 V
Providing an external reference from 0V to 450 mV the output voltage will be regulated but
some restrictions must be considered:
● The minimum OVP threshold is set at 300 mV.
● The under-voltage-protection doesn’t work.
● The PGOOD signal remains low.
To set the resistor divider it must be considered that a 100 kΩ pull-down resistor is
integrated into the device (see Figure 7.). Finally it must be taken into account that the
voltage at the EAREF pin is captured by the device at the start-up when Vcc is about 4 V.
Figure 6. Bypassing the LDO