lt6700hvcs6-3-trpbf Linear Technology Corporation, lt6700hvcs6-3-trpbf Datasheet - Page 15

• Manufacturer Part Number: lt6700hvcs6-3-trpbf
• Description: Micropower, Low Voltage, Dual Comparator With 400mv Reference
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
Power Supplies
The comparator family core circuitry operates from a single
1.4V to 18V supply. A minimum 0.1μF bypass capacitor
is required between the V
load is connected to the supply rail near the part and the
output is sinking more than 5mA, a 1μF bypass capacitor is
recommended. In instances where the supply is relatively
“soft” (such as with small batteries) and susceptible to
load steps, an additional 47Ω series decoupling resistor
can further improve isolation of supply transients from
the V
Flexible Window Comparator
Using the LT6700-1/LT6700HV-1 as shown in the circuits
of Figure 1, the wire-AND confi guration permits high
accuracy window functions to be implemented with a
S
pin.
0.1μF
R3
301k
R2
6.04k
R1
40.2k
+INA
–INB OUTB
LT6700-1
3.3V Supply Monitor
GND
V
S
OUTA
S
pin and GND. When an output
3.3V
33k
V
OUT
V
HIGH = (3.1V < V
OUT
2% OF TRIP VOLTAGE
HYSTERESIS ZONES
APPROXIMATELY
V
Figure 1. Simple Window Comparator
L
V
S
S
< 3.5V)
V
H
LT6700-1/LT6700-2/LT6700-3/
simple 3-resistor voltage divider network. The section A
comparator provides the V
comparator provides the V
hysteresis providing about 1.7% recovery level at each
trip point to prevent output chatter.
For designs that are to be optimized to detect departure
from a window limit, the nominal resistor divider values
are selected as follows (refer to the resistor designators
shown on the fi rst circuit of Figure 1):
To create window functions optimized for detecting entry
into a window (i.e., where the output is to indicate a “com-
R1 ≤ 400k (this sets the divider current >> I
R2 = R1 • (0.98 • V
R3 = R1 • (2.5 • V
LT6700HV-1/LT6700HV-2/
0.1μF
40.2k
487k
6.04k
5V Supply Monitor
+INA
–INB OUTB
LT6700-1
GND
V
H
S
OUTA
H
– 0.98 • V
/V
L
L
– 1)
H
trip-point and the section B
5V
trip-point, with the built-in
33k
6700123 F01
H
LT6700HV-3
/V
V
HIGH = (4.7V < V
L
OUT
)
B
S
of inputs)
< 5.3V)
15
6700123ff