LTC1728ES5-5#TRMPBF Linear Technology, LTC1728ES5-5#TRMPBF Datasheet - Page 12
![IC MON TRPL MCRPWR TSOT23-5](/photos/6/57/65785/tsot-23-5_05-08-1635_sml.jpg)
LTC1728ES5-5#TRMPBF
Manufacturer Part Number
LTC1728ES5-5#TRMPBF
Description
IC MON TRPL MCRPWR TSOT23-5
Manufacturer
Linear Technology
Type
Multi-Voltage Supervisorr
Datasheet
1.LTC1727EMS8-2.5PBF.pdf
(16 pages)
Specifications of LTC1728ES5-5#TRMPBF
Number Of Voltages Monitored
3
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
3.086V, 4.675V, Adj
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-5, TSOT-5, TSOP-5
Voltage Supervisor Type
Voltage Monitor
Number Of Voltage Supervisors
3
Monitored Supervisor Voltage
3.086/4.675/Adj
Reset Threshold Voltage (min)
3.036/4.6/AdjV
Reset Threshold Voltage (max)
3.135/4.75/AdjV
Operating Supply Voltage (min)
1V
Operating Supply Voltage (max)
7V
Package Type
TSOT-23
Operating Temperature Classification
Industrial
Operating Temp Range
-40C to 85C
Pin Count
5
Mounting
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LTC1728ES5-5#PBF
LTC1728ES5-5#PBF
LTC1728ES5-5#PBF
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
applicaTions inForMaTion
LTC1727/LTC1728
Typical applicaTions
Figure 4 contains a simple circuit for 5V systems that can’t
risk the RST output going high in the 3.1V to 4.15V range
(possibly due to very slow rise time on the 5V supply).
Diode D1 powers the LTC1728-5 while dropping ≈ 0.6V
from the V
internal override circuit from being activated. Without the
override circuit active, the RST pin stays low until V
reaches V
12
5V
0.1µF
Figure 4. LTC1728-5 Monitoring a Single 5V
Supply. D1 Used to Avoid RST High Near 3.1V
to 4V (See Figure 3).
RT5
CC5
≅ 4.675V. (See Figure 5.)
pin to the V
D1
5
4
3
2
D1: MMBD914 OR EQUIVALENT
V
V
V
GND
CC3
CC5
CCA
LTC1728-5
CC3
RST
pin. This prevents the part’s
ADJUSTABLE SUPPLY
OR DC/DC FEEDBACK
1
Triple Supply Monitor (3.3V, 5V and Adjustable)
R1
10k
DIVIDER
TO SYSTEM
RESET
1727/28 F04
R1*
*TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL
COMBINATION OF R1 AND R2 ≤ 66.5k
3.3V
CC5
5V
R2*
5
4
3
2
LTC1727-2.5/LTC1728-2.5/LTC1728-1.8/LTC1728-3.3
Override Functions
The V
V
V
point for V
be tied to V
V
result in the continuous assertion of RST.
V
V
V
GND
CC18
CC3
CC25
CC3
CC5
CCA
LTC1728-5
and V
CCA
. This is an obvious solution since the trip points for
/V
RST
CC18
pin, if unused, can be tied to either V
CCA
CC25
CC3
Figure 5. RST Output Voltage
Characteristics of the Circuit in Figure 4
1727/28 TA03
5
4
3
2
1
0
1
and operating off of a 2.5V/1.8V supply will
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
. Likewise, the V
. V
V
10k PULL-UP FROM RST TO V
T
SYSTEM RESET
/V
CC5
A
= 25°C
CC3
CC18
= V
CCA
must always be used. Tying V
will always be greater than the trip
= 0V TO 5V
V
CC5
(V)
CC25
CC5
/V
CC18
1727/28 F05
, if unused, can
CC3
or V
CC3
CC25
17278fb
to
/