TC54VC MICROCHIP [Microchip Technology], TC54VC Datasheet - Page 6

• Manufacturer Part Number: TC54VC
• Description: CMOS voltage detectors that are especially well suited for battery-powered
• Manufacturer: MICROCHIP [Microchip Technology]

TC54
4.0
4.1
Although the TC54 has a pre-programmed V
sometimes necessary to make adjustments during pro-
totyping. This can be accomplished by connecting an
external resistor divider to a TC54, which has a V
lower than that of V
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 1 µA operating current required by the TC54. A rea-
sonable value for this bleeder current is 100 µA (100
times the 1 µA required by the TC54). For example, if
V
of R
R
and plugged into the equation of
values for R
recommended.
FIGURE 4-1:
TC54 using External Resistor Divider.
DS21434J-page 6
DET
Where:
1
V
Note:
+ R
SOURCE
1
V
– = 2V and the desired trip point is 2.5V, the value
R
R
V
DET
2
+ R
SOURCE
2
1
can be rounded to the nearest standard value
APPLICATIONS INFORMATION
Modifying the Trip Point, V
– = Threshold Voltage setting of TC54
V SOURCE
2
In this example, V
greater than (V
1
= Voltage to be monitored
is 25 k (2.5V/100 µA). The value of
and R
V
IN
SOURCE

Modify Trip-Point of the
2
V
. 1% tolerance resistors are
SS
-------------------- -
R
TC54
1
R
DET
(Figure
+
1
R
– )
2
Figure 4-1
SOURCE
=
4-1).
V DET -
V
OUT
must be
to calculate
DET
DET
– , it is
–
DET
–
4.2
Low operating power and small physical size make the
TC54 series ideal for many voltage detector applica-
tions, such as those shown in Figures 4-2,
Figure 4-2
circuit that prevents the overheating of the logic-level
MOSFET due to insufficient gate voltage. When the
input signal is below the threshold of the TC54VN, its
output grounds the gate of the MOSFET.
and
monitoring applications.
FIGURE 4-2:
Protection.
FIGURE 4-3:
FIGURE 4-4:
Pwr
Sply
+
4-4
–
+
– –
Other Applications
TC54VX
show the TC54 in conventional voltage
shows a low-voltage gate drive protection
4.3V
V
TC54VX
TC54VX
V
V
IN
V
SS
SS
IN
 2001-2011 Microchip Technology Inc.
270
V
V
IN
SS
MOSFET Low Drive
Battery Voltage Monitor.
Power Good Monitor.
V
OUT
V
V
OUT
OUT
V
CC
MTP3055EL
R
Power Good
L
BATLOW
4-3
Figures 4-3
and 4-4.