TC1270ATVRCTR Microchip Technology, TC1270ATVRCTR Datasheet - Page 26

• Manufacturer Part Number: TC1270ATVRCTR
• Description: IC,Power Supply Supervisor,TO-253,4PIN,PLASTIC
• Manufacturer: Microchip Technology
• Type: Simple Reset/Power-On Resetr

Specifications of TC1270ATVRCTR

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 3.08V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-143, SOT-143B, TO-253AA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TC1270A/70AN/71A
5.4
Although the TC127XA device has a fixed voltage trip
point (V
adjustments. This is accomplished by connecting an
external resistor divider to the TC127XA V
causes the V
when the TC127XA input equals its V
(Figure
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 15 µA maximum operating current required by the
TC127XA. A reasonable value for this bleeder current
is 1 mA (67 times the 10 µA required by the TC127XA).
For example, if V
2.5V, the value of R
value of R
standard value and plugged into the equation shown in
Figure 5-5
1% tolerance resistors are recommended.
FIGURE 5-5:
External Resistor Divider.
DS22035C-page 26
Where:
Note: In this example, V
V
V
R
R
SOURCE
SOURCE
2
1
5-5).
TRIP
V
Modifying The Trip Point, V
than V
TRIP
V
to calculate values for R
1
SOURCE
), it can be necessary to make custom
SOURCE
+ R
V
TRIP
= Voltage to be monitored
= Threshold Voltage setting
DD
TRIP
2
.
1
can be rounded to the nearest
= 2V and the desired trip point is
+ R
V

Modifying Trip-Point using
voltage to be higher than it is
TC127XA
SS
--------------------
R
2
1
SOURCE
is 2.5 k (2.5V/1 mA). The
R
+
1
R
2

1
must be greater
V
and R
RST
or RST
TRIP
TRIP
DD
2
.
TRIP
pin. This
voltage
5.5
Low operating power and small physical size make the
TC1270AN series ideal for many voltage detector
applications.
protection circuit that prevents the logic-level MOSFET
from overheating due to insufficient gate voltage. When
the input signal is below the threshold of the
TC1270AN, its output grounds the gate of the
MOSFET.
FIGURE 5-6:
Protection.
Note 1:
TC1270AN
MOSFET Low-Drive Protection
This resistance should be sized appro-
priately for the selected trip point volt-
age related to the V
Figure 5-6
V
TRIP
V
V
SS
DD
270
MOSFET Low-Drive
 2010 Microchip Technology Inc.
shows a low-voltage gate drive
RST
(1)
OL
V
operation.
DD
MTP3055EL
R
L