LT6700HVHS6-3#TRPBF Linear Technology, LT6700HVHS6-3#TRPBF Datasheet - Page 15

• Manufacturer Part Number: LT6700HVHS6-3#TRPBF
• Description: IC COMP DUAL 400MV REF TSOT23-6
• Manufacturer: Linear Technology
• Series: Over-The-Top®r
• Type: General Purposer

Specifications of LT6700HVHS6-3#TRPBF

• Number Of Elements: 2
• Output Type: Open Collector
• Voltage - Supply: 1.4 V ~ 18 V
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6 Thin, TSOT-23-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

applicaTions inForMaTion
using a supply filter, the start-up time of the LT6700 will
increase to:
Where t
change in supply in volts. The low supply current of the
LT6700 should not cause significant voltage drop due to
a 2k maximum series R.
Flexible Window Comparator
Using the LT6700-1/LT6700HV-1 as shown in the circuits
of Figure 1, the wire-AND configuration permits high
accuracy window functions to be implemented with a
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 first 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-
ing into spec” condition, as with the examples in Figure 1),
t
R1 ≤ 400k (this sets the divider current >> I
R2 = R1 • (0.98 • V
R3 = R1 • (2.5 • V
START
0.1µF
START
= (0.17ms + 0.25 • t
R3
301k
R2
6.04k
R1
40.2k
and t
+INA
–INB OUTB
LT6700-1
3.3V Supply Monitor
RC
GND
V
H
S
OUTA
H
are in milliseconds and ΔV
– 0.98 • V
/V
L
L
– 1)
H
3.3V
trip-point and the section B
trip-point, with the built-in
RC
33k
) • ΔV
H
/V
V
OUT
V
HIGH = (3.1V < V
OUT
L
)
S
2% OF TRIP VOLTAGE
HYSTERESIS ZONES
APPROXIMATELY
V
Figure 1. Simple Window Comparator
L
V
S
B
S
of inputs)
< 3.5V)
V
H
S
is the
the nominal resistor values are selected as follows:
The worst-case variance of the trip-points is related to
the specified threshold limits of the LT6700/LT6700HV
device and the basic tolerance of divider resistors used.
For resistor tolerance R
case trip-point voltage (either V
predicted as follows (italicized values are taken from the
data sheet, expressed in volts):
Max dev V
/ V
Max dev V
/ V
Generating an External Reference Signal
In some applications, it would be advantageous to have
access to a signal that is directly related to the internal
400mV reference, even though the reference itself is not
available externally. This can be accomplished to a reason-
able degree by using an inverting comparator section as
a “bang-bang” servo, establishing a nominal voltage, on
an integration capacitor, that is scaled to the reference.
This method is used in Figure 2, where the reference level
has been doubled to drive a resistor bridge. The section
B output cycles on and off to swing the section B input
between its hysteresis trip points as the load capacitor
R1 ≤ 400k (this sets the divider current >> I
R2 = R1 • (1.02 • V
R3 = R1 • (2.54 • V
TRIPnom
TRIPnom
0.1µF
TRIP↓
TRIP↑
] + 1.25 • ( V
] + 1.27 • ( V
40.2k
487k
6.04k
= ±V
= ±V
5V Supply Monitor
+INA
–INB OUTB
LT6700-1
TRIPnom
GND
TRIPnom
V
LT6700/LT6700HV
S
OUTA
H
H
TH(R)max
TH(F)max
/V
TOL
– 1.02 • V
L
– 1)
(e.g. 0.01 for 1%), the worst-
• {2 • R
• {2 • R
5V
– V
33k
H
6700123 F01
– V
or V
H
TOL
TH(F)min
TOL
TH(R)min
/V
V
HIGH = (4.7V < V
OUT
L
L
• [(V
) deviations can be
)
• [(V
TRIPnom
)}
)}
TRIPnom
B
S
of inputs)
< 5.3V)

– 0.39)
6700123fg
– 0.4)