Diodes ZLDO500 - Manual (Page 8)

Figure 4
ZLDO500 devices, the parts can be damaged
by sustained output shorts or excessive loads
when combined with high input supply
voltages. To ensure reliable operation, keep
loads within the SOA graph boundaries
Indicated in the typical characteristics.
5). Low Battery Flag
The ZLDO500 provides an output called Low
Battery Flag (LBF). Unlike many regulators
that only signal that they are falling out of
regulation, the LBF output of the ZLDO500
series indicates that the voltage drop across
the regulator has fallen to less than typically
300mV and so supply failure is imminent.
This improved warning gives both more time
for the system supplied to shutdown
gracefully and maintains regulation while
this happens. This could be a vital point if
measurements are under way and must be
Spg
D/C
Vout
LBF
SC
Vin
N/C
Gnd
ZLDO500
6V
C2
1uF
C1
10pF
C3
100nF
R1
100k
0V
+ 5V
Microproc.
System
Interrupt
Input
ZLDO500
APPLICATIONS
4-87