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LTC1728ES5-1.8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC1727/LTC1728
1
17278fd
For more information www.linear.com/LTC1727
TYPICAL APPLICATION
DESCRIPTION
Micropower Precision
Triple Supply Monitors in 8-Lead MSOP
and 5-Lead SOT-23 Packages
The LT C
®
1727 is a triple supply monitor intended for
systems with multiple supply voltages. Each supply moni
-
tor has its own open-drain output for individual supply
monitoring. A common open-drain reset output remains
low until all three supplies have been in compliance for
200ms. Tight 1.5% accuracy specifications and glitch
immunity ensure reliable reset operation without false
triggering.
The LTC1728 is functionally identical to the LTC1727
without the individual monitor outputs.
The RST output is guaranteed to be in the correct state
for V
CC5
/V
CC25
/V
CC18
or V
CC3
down to 1V. The LTC1727/
LTC1728 may also be configured to monitor any one or
two V
CC
inputs instead of three, depending on system
requirements.
Very low (10µA typical) supply current makes the LTC1727/
LTC1728 ideal for power conscious systems.
The LTC1727 is available in an 8-lead MSOP or SO pack
-
age and the LTC1728 is available in a 5-lead SOT-23
package.
Triple Supply Monitor with Power Good Output
(3.3V, 2.5V and Adjustable)
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
n
Monitors Three Inputs Simultaneously
LTC1727-5: 5V, 3.3V and ADJ
LTC1727-2.5: 2.5V, 3.3V and ADJ
LTC1728-5: 5V, 3.3V and ADJ
LTC1728-2.5: 2.5V, 3.3V and ADJ
LTC1728-1.8: 3V, 1.8V and ADJ
LTC1728-3.3: 3.3V, 1.8V and ADJ
n
±1.5% Threshold Accuracy Over Temperature
n
Very Low Supply Current: 10µA Typ
n
200ms Reset Time Delay
n
Active Low RESET Output
n
Power Supply Glitch Immunity
n
Guaranteed RESET for V
CC3
≥ 1V
or V
CC5
/V
CC25
/V
CC18
≥ 1V
n
LTC1727 Includes Monitor Output for Each Supply
n
LTC1727: 8-Lead MSOP and SO Packages
n
LTC1728: 5-Lead SOT-23 Package
n
Desktop Computers
n
Notebook Computers
n
Intelligent Instruments
n
Portable Battery-Powered Equipment
n
Network Servers
V
CC3
V
CC5
V
CCA
RST
GND
LTC1728-5
1727/28 TA01
3.3V
5V
1.8V
0.1µF
61.9k
1%
100k
1%
DC/DC
CONVERTER
SYSTEM
LOGIC
0.1µF
LTC1727-2.5
R2
1727/28 TA08
R1
ADJUSTABLE
SUPPLY
3.3V
2.5V
10k
POWER
GOOD
SYSTEM
RESET
10k
V
CC3
V
CC25
V
CCA
GND
COMP3
COMP25
RST
COMPA
LTC1727/LTC1728
2
17278fd
For more information www.linear.com/LTC1727
ABSOLUTE MAXIMUM RATINGS
V
CC3
, V
CC5
/V
CC25
/V
CC18
, V
CCA
........................
–0.3V to 7V
RST ............................................................. – 0.3V to 7V
COMPA, COMP3, COMP25/COMP5
(MS8 and SO-8 Only) ............................. –0.3V to 7V
(Notes 1, 2)
PIN CONFIGURATION
Operating Temperature Range
LTC1727/LTC1728E (Note 3) ............... – 40°C to 85°C
LTC1728H ..........................................– 40°C to 125°C
LTC1727I..............................................– 40°C to 85°C
Storage Temperature Range .................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
1
2
3
4
V
CC3
V
CC5
/V
CC25
V
CCA
GND
8
7
6
5
COMP3
COMP25/COMP5
RST
COMPA
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 200°C/W
1
2
3
4
8
7
6
5
TOP VIEW
COMP3
RST
COMPA
V
CC3
V
CCA
GND
S8 PACKAGE
8-LEAD PLASTIC SO
COMP25/
COMP5
V
CC5
/
V
CC25
T
JMAX
= 125°C, θ
JA
= 150°C/W
RST 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
V
CCA
3
5 V
CC3
4
V
CC5
/
V
CC25
/
V
CC18
T
JMAX
= 125°C, θ
JA
= 250°C/W
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1727EMS8-2.5#PBF LTC1727EMS8-2.5#TRPBF LTHY 8-Lead Plastic MSOP –40°C to 85°C
LTC1727EMS8-2.5#PBF LTC1727EMS8-2.5#TRPBF LTHX 8-Lead Plastic MSOP –40°C to 85°C
LTC1727ES8-2.5#PBF LTC1727ES8-2.5#TRPBF 172725 8-Lead Plastic SO –40°C to 85°C
LTC1727IS8-2.5#PBF LTC1727IS8-2.5#TRPBF 727I25 8-Lead Plastic SO –40°C to 85°C
LTC1727ES8-5#PBF LTC1727ES8-5#TRPBF 17275 8-Lead Plastic SO –40°C to 85°C
LTC1727IS8-5#PBF LTC1727IS8-5#TRPBF 172715 8-Lead Plastic SO –40°C to 85°C
LTC1728ES5-1.8#PBF LTC1728ES5-1.8#TRPBF LTPH 8-Lead Plastic SOT-23 –40°C to 85°C
LTC1728ES5-2.5#PBF LTC1728ES5-2.5#TRPBF LTIA 8-Lead Plastic SOT-23 –40°C to 85°C
LTC1728ES5-3.3#PBF LTC1728ES5-3.3#TRPBF LTY P 8-Lead Plastic SOT-23 –40°C to 85°C
LTC1728ES5-5#PBF LTC1728ES5-5#TRPBF LTHZ 8-Lead Plastic SOT-23 –40°C to 85°C
LTC1728HS5-5#PBF LTC1728HS5-5#TRPBF LTHZ 8-Lead Plastic SOT-23 –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ORDER INFORMATION
LTC1727/LTC1728
3
17278fd
For more information www.linear.com/LTC1727
ELECTRICAL CHARACTERISTICS
All except LTC1728-1.8/LTC1728-3.3. The l denotes specifications which
apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C. V
CC3
= 3.3V, V
CC5
= 5V,
V
CC25
= 2.5V, V
CCA
= V
CC3
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT3
Reset Threshold V
CC3
V
CC3
Input Threshold
l
3.036 3.086 3.135 V
V
RT5
Reset Threshold V
CC5
V
CC5
Input Threshold (5V Version)
l
4.600 4.675 4.750 V
V
RT25
Reset Threshold V
CC25
V
CC25
Input Threshold (2.5V Version)
l
2.300 2.338 2.375 V
V
RTA
Reset Threshold V
CCA
V
CCA
Input Threshold
l
0.985 1.000 1.015 V
V
CCOP
V
CC3
, V
CC5
/V
CC25
Operating Voltage RST, COMP3, COMP5, COMP25 in Correct Logic State
l
1 7 V
V
CCOPA
V
CC3
, V
CC5
/V
CC25
Operating Voltage Minimum Supply Voltage to Guarantee COMPA
in Correct Logic State
l
2 2.3 V
I
VCC3
V
CC3
Supply Current V
CC5
/V
CC25
> V
CC3
V
CC5
/V
CC25
< V
CC3
, V
CC3
= 3.3V (Note 4)
l
l
1
10
2
20
µA
µA
I
VCC25
V
CC25
Supply Current V
CC25
< V
CC3
, V
CC25
= 2.5V (Note 4)
l
1 2 µA
I
VCC5
V
CC5
Supply Current V
CC5
= 5V, V
CC3
< V
CC5
l
10 20 µA
I
VCCA
V
CCA
Input Current V
CCA
= 1V
–40°C < T
A
< 125°C
l
l
–15
–20
0
0
15
50
nA
nA
t
RST
Reset Pulse Width RST Low with 10k Pull-Up to V
CC3
(Note 5)
–40°C < T
A
< 125°C
l
l
140
140
200 280
350
ms
ms
t
UV
V
CC
Undervoltage Detect to RST
or COMPX
V
CC5
, V
CC25
, V
CC3
or V
CCA
Less Than Reset
Threshold V
RT
by More Than 1% (Note 5)
110 µs
V
OL
Output Voltage Low, RST, COMPX I
SINK
= 2.5mA, V
CC3
= 3V, V
CC5
/V
CC25
= 0V
I
SINK
= 100µA, V
CC3
= 1V, V
CC5
/V
CC25
= 0V
I
SINK
= 100µA, V
CC3
= 0V, V
CC5
/V
CC25
= 1V
I
SINK
= 100µA, V
CC3
= 1V, V
CC5
/V
CC25
= 1V
l
l
l
l
0.15
0.05
0.05
0.05
0.4
0.3
0.3
0.3
V
V
V
V
V
OH
Output Voltage High, RST, COMPX (Note 6) I
SOURCE
= 1µA
l
V
CC3
– 1 V
LTC1727-5/LTC1728-5 Only
V
OVR
V
CC5
Reset Override Voltage (Note 7) Override V
CC5
Ability to Assert RST V
CC3
±0.025 V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT3
Reset Threshold V
CC3
V
CC3
Input Threshold
l
2.760 2.805 2.850 V
V
RT18
Reset Threshold V
CC18
V
CC18
Input Threshold
l
1.656 1.683 1.710 V
V
RTA
Reset Threshold V
CCA
V
CCA
Input Threshold
l
0.985 1.000 1.015 V
V
CCOP
V
CC3
, V
CC18
Operating Voltage RST in Correct Logic State
l
1 7 V
I
VCC3
V
CC3
Supply Current V
CC18
> V
CC3
V
CC18
< V
CC3
, V
CC3
= 3V (Note 4)
l
l
1
10
2
20
µA
µA
I
VCC18
V
CC18
Supply Current V
CC18
< V
CC3
, V
CC18
= 1.8V (Note 4)
l
1 2 µA
I
VCCA
V
CCA
Input Current V
CCA
= 1V
l
–15 0 15 nA
t
RST
Reset Pulse Width RST Low (Note 5)
l
140 200 280 ms
t
UV
V
CC
Undervoltage Detect to RST V
CC18
, V
CC3
or V
CCA
Less Than Reset (Note 5)
Threshold V
RT
by More Than 1%
110 µs
V
OL
Output Voltage Low, RST I
SINK
= 2.5mA, V
CC3
= 3V, V
CC18
= 0V
I
SINK
= 100µA, V
CC3
= 1V, V
CC18
= 0V
I
SINK
= 100µA, V
CC3
= 0V, V
CC18
= 1V
I
SINK
= 100µA, V
CC3
= 1V, V
CC18
= 1V
l
l
l
l
0.15
0.05
0.05
0.05
0.4
0.3
0.3
0.3
V
V
V
V
V
OH
Output Voltage High, RST I
SOURCE
= 1µA (Note 6)
l
V
CC3
– 1 V
LTC1728-1.8 The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at
T
A
= 25°C. V
CC3
= 3V, V
CC18
= 1.8V, V
CCA
= V
CC3
unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC1728ES5-1.8#TRPBF

Mfr. #:
Buy LTC1728ES5-1.8#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits uP Prec 3x S Mon s in 8-Lead MS & 5-Lead
Lifecycle:
New from this manufacturer.
Delivery:
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