ANALOG DEVICES LTC 1728 ES5-2.5 Datasheet

LTC1727/LTC1728
Micropower Precision
Triple Supply Monitors
in 8-Lead MSOP and

FeaTures

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
or V
n
n
n
CC5/VCC25/VCC18
LTC1727 Includes Monitor Output for Each Supply
LTC1727: 8-Lead MSOP and SO Packages
LTC1728: 5-Lead SOT-23 Package
≥ 1V
CC3
≥ 1V

applicaTions

n
Desktop Computers
n
Notebook Computers
n
Intelligent Instruments
n
Portable Battery-Powered Equipment
n
Network Servers

DescripTion

The LTC®1727 is a triple supply monitor intended for systems with multiple supply voltages. Each supply moni­tor 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/VCC25/VCC18
or V LTC1728 may also be configured to monitor any one or two V
inputs instead of three, depending on system
CC
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 pack­age and the LTC1728 is available in a 5-lead SOT-23 package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
down to 1V. The LTC1727/
CC3

Typical applicaTion

3.3V
DC/DC
CONVERTER
5V
1.8V
0.1µF
0.1µF
5 1
4
R1
61.9k 3
1%
R2 100k 1%
V
CC3
LTC1728-5
V
CC5
V
CCA
RST
GND
1727/28 TA01
SYSTEM
LOGIC
2
ADJUSTABLE
SUPPLY
Triple Supply Monitor with Power Good Output
(3.3V, 2.5V and Adjustable)
R3
LTC1727-2.5
1
3.3V
2.5V
R1
R2
V
CC3
2
COMP25
V
CC25
3
V
CCA
4
GND
COMP3
RST
COMPA
8
7
6
5
1727/28 TA08
10k
R4 10k
POWER GOOD
SYSTEM RESET
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1
LTC1727/LTC1728

absoluTe MaxiMuM raTings

V
, V
CC3
CC5/VCC25/VCC18
, V
CCA ........................
–0.3V to 7V
(Notes 1. 2)
RST ............................................................. – 0.3V to 7V
COMPA, COMP3, COMP25/COMP5
(MS8 and SO-8 Only) ............................. – 0.3V to 7V

pin conFiguraTion

TOP VIEW
TOP VIEW
V
1
CC3
V
CC5/VCC25
2 3
V
CCA
4
GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
= 125°C, θJA = 200°C/W
T
JMAX
ORDER
PART NUMBER
8
COMP3
7
COMP25/COMP5
6
RST
5
COMPA
MS8
PART MARKING
V
1
CC3
V
/
CC5
2
V
CC25
V
3
CCA
GND
4
S8 PACKAGE
8-LEAD PLASTIC SO
= 125°C, θJA = 150°C/W
T
JMAX
ORDER
PART NUMBER
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
COMP3
8
COMP25/
7
COMP5
RST
6
COMPA
5
S8
PART MARKING
RST 1
GND 2
V
ORDER
PART NUMBER
TOP VIEW
3
CCA
S5 PACKAGE
5-LEAD PLASTIC SOT-23
= 125°C, θJA = 250°C/W
T
JMAX
PART MARKING
5 V
4
V V V
CC3
CC5 CC25 CC18
S5
/
/
LTC1727EMS8-2.5 LTC1727EMS8-5
LTHY LTHX
LTC1727ES8-2.5 LTC1727IS8-2.5 LTC1727ES8-5 LTC1727IS8-5
172725 727I25 17275 172715
LTC1728ES5-1.8 LTC1728ES5-2.5 LTC1728ES5-3.3 LTC1728ES5-5 LTC1728HS5-5
LTPH LTIA LTY P LTHZ LTHZ
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
All except LTC1728-1.8/LTC1728-3.3. The l denotes specifications which
elecTrical cHaracTerisTics
apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V V
CC25
= 2.5V, V
CCA
= V
unless otherwise noted.
CC3
= 3.3V, V
CC3
CC5
= 5V,
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT3
V
RT5
V
RT25
V
RTA
V
CCOP
V
CCOPAVCC3
Reset Threshold V
Reset Threshold V
Reset Threshold V
Reset Threshold V
V
, V
CC3
CC5/VCC25
, V
CC5/VCC25
V
CC3
CC5
CC25
CCA
Input Threshold
CC3
V
Input Threshold (5V Version)
CC5
V
Input Threshold (2.5V Version)
CC25
V
Input Threshold
CCA
Operating Voltage RST, COMP3, COMP5, COMP25 in Correct Logic State
Operating Voltage Minimum Supply Voltage to Guarantee COMPA
l
3.036 3.086 3.135 V
l
4.600 4.675 4.750 V
l
2.300 2.338 2.375 V
l
0.985 1.000 1.015 V
l
1 7 V
l
2 2.3 V
in Correct Logic State
2
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LTC1727/LTC1728

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 TA = 25°C. V V
= 2.5V, V
CC25
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VCC3
I
VCC25
I
VCC5
I
VCCA
t
RST
t
UV
V
V
V
V
Reset Pulse Width RST Low with 10k Pull-Up to V
VCC Undervoltage Detect to RST or COMPX
V
OL
V
OH
Output Voltage Low, RST, COMPX I
Output Voltage High, RST, COMPX (Note 6) I
LTC1727-5/LTC1728-5 Only
V
OVR
V
= V
CCA
Supply Current V
CC3
Supply Current V
CC25
Supply Current V
CC5
Input Current V
CCA
unless otherwise noted.
CC3
CC5/VCC25
V
CC5/VCC25
CC25
CC5
CCA
–40°C < T
–40°C < T
V
CC5
Threshold V
SINK
I
SINK
I
SINK
I
SINK
SOURCE
Reset Override Voltage (Note 7) Override V
CC5
> V < V
< V
, V
CC3
= 5V, V
CC3
= 1V
< 125°C
A
< 125°C
A
, V
, V
CC25
CC3
by More Than 1% (Note 5)
RT
= 2.5mA, V = 100µA, V = 100µA, V = 100µA, V
= 1µA
Ability to Assert RST V
CC5
CC3
, V
CC3
= 3.3V (Note 4)
CC3
= 2.5V (Note 4)
CC25
< V
CC5
or V
CCA
= 3V, V
CC3
= 1V, V
CC3
= 0V, V
CC3
= 1V, V
CC3
(Note 5)
CC3
Less Than Reset
CC5/VCC25 CC5/VCC25 CC5/VCC25 CC5/VCC25
= 0V = 0V = 1V = 1V
= 3.3V, V
CC3
= 5V,
CC5
l l
l
l
l l
l l
–15 –20
140 140
1
10
1 2 µA
10 20 µA
0 0
200 280
110 µs
l l l l
l
V
– 1 V
CC3
0.15
0.05
0.05
0.05
±0.025 V
CC3
2
20
15 50
350
0.4
0.3
0.3
0.3
µA µA
nA nA
ms ms
V V V V
LTC1728-1.8 The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT3
V
RT18
V
RTA
V
CCOP
I
VCC3
I
VCC18
I
VCCA
t
RST
t
UV
V
OL
V
OH
= 3V, V
CC3
Reset Threshold V
Reset Threshold V
Reset Threshold V
V
, V
CC3
V
Supply Current V
CC3
V
Supply Current V
CC18
V
Input Current V
CCA
= 1.8V, V
CC18
CC3
CC18
CCA
Operating Voltage RST in Correct Logic State
CC18
CCA
= V
unless otherwise noted.
CC3
V
Input Threshold
CC3
V
Input Threshold
CC18
V
Input Threshold
CCA
> V
CC18
V
< V
CC18
< V
CC18
= 1V
CCA
CC3 CC3
CC3
, V
, V
Reset Pulse Width RST Low (Note 5)
VCC Undervoltage Detect to RST V
Output Voltage Low, RST I
Output Voltage High, RST I
, V
CC18
CC3
Threshold V
= 2.5mA, V
SINK
I
= 100µA, V
SINK
I
= 100µA, V
SINK
I
= 100µA, V
SINK
= 1µA (Note 6)
SOURCE
or V
by More Than 1%
RT
= 3V (Note 4)
CC3
= 1.8V (Note 4)
CC18
Less Than Reset (Note 5)
CCA
CC3 CC3 CC3 CC3
= 3V, V = 1V, V = 0V, V = 1V, V
CC18 CC18 CC18 CC18
= 0V = 0V = 1V = 1V
l
2.760 2.805 2.850 V
l
1.656 1.683 1.710 V
l
0.985 1.000 1.015 V
l
1 7 V
l l
l
l
–15 0 15 nA
l
140 200 280 ms
1
10
2
20
1 2 µA
110 µs
l l l l
l
V
CC3
0.15
0.05
0.05
0.05
0.4
0.3
0.3
0.3
– 1 V
µA µA
V V V V
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3
LTC1727/LTC1728
elecTrical cHaracTerisTics
LTC1728-3.3 The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RT3
V
RT18
V
RTA
V
CCOP
I
VCC3
I
VCC18
I
VCCA
t
RST
t
UV
V
OL
V
OH
= 3.3V, V
CC3
Reset Threshold V
Reset Threshold V
Reset Threshold V
V
, V
CC3
CC18
V
Supply Current V
CC3
V
Supply Current V
CC18
V
Input Current V
CCA
CC18
CC3
CC18
CCA
= 1.8V, V
CCA
= V
unless otherwise noted.
CC3
V
Input Threshold
CC3
V
Input Threshold
CC18
V
Input Threshold
CCA
Operating Voltage RST in Correct Logic State
> V
CC18 CC18
CC18
CCA
< V
< V
= 1V
CC3 CC3
CC3
, V
, V
CC3
CC18
V
Reset Pulse Width RST Low (Note 5)
VCC Undervoltage Detect to RST V
Output Voltage Low, RST I
Output Voltage High, RST I
, V
CC18
CC3
Threshold V
= 2.5mA, V
SINK
I
= 100µA, V
SINK
I
= 100µA, V
SINK
I
= 100µA, V
SINK
= 1µA (Note 6)
SOURCE
or V
by More Than 1%
RT
= 3.3V (Note 4)
= 1.8V (Note 4)
Less Than Reset (Note 5)
CCA
= 3.3V, V
CC3
= 1V, V
CC3
= 0V, V
CC3
= 1V, V
CC3
CC18 CC18 CC18 CC18
= 0V = 0V = 1V = 1V
l
3.036 3.086 3.135 V
l
1.656 1.683 1.710 V
l
0.985 1.000 1.015 V
l
1 7 V
l l
l
l
–15 0 15 nA
l
140 200 280 ms
1
10
2
20
1 2 µA
110 µs
l l l l
l
V
CC3
0.15
0.05
0.05
0.05
0.4
0.3
0.3
0.3
– 1 V
µA µA
V V V V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: All voltage values are with respect to GND. Note 3: The LTC1727E/LTC1728E are guaranteed to meet specified
performance from 0°C to 70°C and are designed, characterized and assured to meet the extended temperature limits of –40°C to 85°C but are not tested at these temperatures.
Note 4: Both V
CC3
and V
CC5/VCC25/VCC18
can act as the supply depending
on which pin has the greatest potential. Note 5: Measured from when input passes through the input threshold
(V
) until RST or COMPX passes through 1.5V.
RTX
Note 6: The output pins RST and COMPX have internal pull-ups to V
CC3
of typically 6µA. However, external pull-up resistors may be used when faster rise times are required or for V
Note 7: The V
reset override voltage is valid for an operating range less
CC5
voltages greater than V
OH
CC3
.
than approximately 4.15V. Above this point the override is turned off and the V
pin functions normally.
CC5
4
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Typical perForMance cHaracTerisTics

LTC1727/LTC1728
Input Current
V
CCA
vs Input Voltage
2.0 TA = 25°C
1.5
1.0
0.5
0
–0.5
INPUT CURRENT (nA)
–1.0
–1.5
–2.0
0.80 0.85 0.95 1.05 1.15
0.90
1
INPUT VOLTAGE (V)
Reset Pulse Width vs Temperature
280
260
(ms)
240
RST
220
200
180
RESET PULSE WIDTH, t
160
140
–60 –40
–20 20 40 800 100
TEMPERATURE (°C)
1.10
60
1727/28 G01
1727/28 G04
1.015
(V)
1.010
RTA
1.005
1.000
0.995
THRESHOLD VOLTAGE, V
0.990
CCA
V
1.20
0.985
(mA)
SINK
I
V
Threshold Voltage
CCA
vs Temperature
–40 0
–60
–20 20
TEMPERATURE (°C)
RST, COMPX I vs Supply Voltage
10
TA = 25°C
9
8
7
6
5
4
3
2
1
0
0
1
Typical Transient Duration vs Comparator Overdrive
SINK
450
400
350
300
250
200
150
100
TYPICAL TRANSIENT DIRATION (µs)
50
0
40
60
80
100
1727/28 G02
0.1
RESET COMPARATOR OVERDRIVE VOLTAGE (% OF VCC)
I
vs Temperature
VCC25
RESET OCCURS ABOVE CURVE
1 10 100
TA = 25°C
1727/28 G03
(LTC1727-2.5/LT1728-2.5)
1.5 V
= 3.3V
CC3
1.4
1.1
(µA)
VCC25
I
0.5
1.3
1.2
1.0
0.9
0.8
0.7
0.6
VOL = 0.4V
VOL = 0.2V
(V)
5
1727/28 G05
6
3 4
2
V
OR V
CC3
CC5
V
CC25
V
CCA
–60
–40 0
= 2.5V
= 3.3V
–20
TEMPERATURE (°C)
80
20
60
40
100
1727/28 G06
I
vs Temperature (LTC1727-
VCC3
2.5/LTC1728-2.5/LTC1728-3.3)
15
V
= 3.3V
CC3
(µA)
VCC3
I
14
13
12
11
10
V V
9
8
7
6
5
–60
= 2.5V
CC25
= 3.3V
CCA
–40 0
–20
20
TEMPERATURE (°C)
I
vs Temperature
VCC3
(LTC1727-5/LTC1728-5)
1.5 V
= 5V
CC5
1.4
1.3
1.2
1.1
(µA)
1.0
VCC3
I
0.9
0.8
0.7
80
60
40
100
1727/28 G07
0.5
0.6
–60
= 3.3V
V
CC3
= 3.3V
V
CCA
–40 0
–20
20
TEMPERATURE (°C)
40
80
60
100
1727/28 G08
I
vs Temperature
VCC5
(LTC1727-5/LTC1728-5)
15
V
= 5V
CC5
14
= 3.3V
V
CC3
= 3.3V
V
CCA
13
12
11
(µA)
10
VCC5
I
9
8
7
6
5
–60
–40 0
–20
TEMPERATURE (°C)
80
20
60
40
100
1727/28 G09
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