9
DEMO MANUAL DC194
MICROPOWER BOOST REGULATOR
OPERATIO
U
BATTLOW
LBI
GND
0.01
µ
F
DC194 F07
V
IN
LBO
1M
1.00M
118k
10M
(a)
LBI
GND
V
IN
V
IN
LBO
SHDN
1M
1.00M
86.6k
10M
(b)
Figure 7. Here Are Two Applications of the Low-Battery Detector.
In (a) It Is Used to Sense the Battery Voltage and Trips when V
IN
Falls Below 1.75V. In (b) It Is Used as an Undervoltage Lockout;
It Won’t Allow the LT1317 to Begin Switching until V
IN
Is Above
2.5V. In Both Cases the 10M Resistor Provides Hysteresis
