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LTC2931HF#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC2931
1
2931fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Confi gurable Six Supply
Monitor with Adjustable Reset
and Watchdog Timers
The LTC
®
2931 is a confi gurable supply monitor for
systems with up to six supply voltages. One of 16 preset or
adjustable voltage monitor combinations can be selected
using an external resistive divider connected to the mode
select pin. The preset voltage thresholds are accurate
to ±1.5% over temperature. The LTC2931 also features
adjustable inputs with a 0.5V nominal threshold. All six
open-drain voltage comparator outputs are connected to
separate pins for individual supply monitoring.
The reset and watchdog timeout periods are adjustable
using external capacitors. Tight voltage threshold accuracy
and glitch immunity ensure reliable reset operation without
false triggering. The RST output is guaranteed to be in the
correct state for V
CC
down to 1V. Each status output has
a weak internal pull-up and may be externally pulled up
to a user defi ned voltage.
The 52μA supply current makes the LTC2931 ideal for
power conscious systems and it may be confi gured to
monitor fewer than six inputs.
Six Supply Monitor 12V (ADJ), 5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ)
■
Simultaneously Monitors Six Supplies
■
16 User Selectable Combinations of
5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and ± Adjustable
Voltage Thresholds
■
Guaranteed Threshold Accuracy: ±1.5%
■
Adjustable Reset and Watchdog Timeout
■
Low Supply Current: 52μA
■
Comparator/Monitor Output for Each Supply
■
Power Supply Glitch Immunity
■
Guaranteed RST for V
CC
≥ 1V
■
High Temperature Operation to 125°C
■
20-Lead TSSOP Package
■
Desktop and Notebook Computers
■
Multivoltage Systems
■
Telecom Equipment
■
Portable Battery-Powered Equipment
■
Network Servers
■
Automotive
COMP1
COMP2
COMP3
COMP4
COMP5
COMP6
LTC2931
1.2V
1.8V
2.5V
3.3V
5V
12V
2931 TA01
t
RST
= 94ms
t
WD
= 940ms
C
WT
47nF
C
RT
47nF
RST
WDO
WDI
VPG
GND
CWT CRT
V1
V2
V3
V4
V5
V6
VREF
SYSTEM
LOGIC
POWER
GOOD
R1
59k
1%
100k
1%
100k
1%
124k
1%
2150k
1%
R2
40.2k
1%
0.1μF
0.1μF
10k
V1 (V) V2 (V) V3 (V) V4 (V) V5 (V) V6 (V)
5.0 3.3 2.5 1.8 ADJ ADJ
5.0 3.3 2.5 1.5 ADJ ADJ
5.0 3.3 2.5 ADJ ADJ ADJ
5.0 3.3 1.8 ADJ ADJ ADJ
5.0 3.3 1.8 –ADJ ADJ ADJ
5.0 3.3 ADJ ADJ ADJ ADJ
5.0 3.3 ADJ –ADJ ADJ ADJ
5.0 3.0 2.5 ADJ ADJ ADJ
5.0 3.0 1.8 ADJ ADJ ADJ
5.0 3.0 ADJ ADJ ADJ ADJ
3.3 2.5 1.8 1.5 ADJ ADJ
3.3 2.5 1.8 ADJ ADJ ADJ
3.3 2.5 1.8 –ADJ ADJ ADJ
3.3 2.5 1.5 ADJ ADJ ADJ
3.3 2.5 ADJ ADJ ADJ ADJ
3.3 2.5 ADJ –ADJ ADJ ADJ
Voltage Threshold Confi guration Table
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6967591, 7239251, 7119714.
LTC2931
2
2931fb
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V1, V2, V3, V4, V5, V6, VPG ........................ –0.3V to 7V
RST , COMP1-6............................................ –0.3V to 7V
CWT, WDO .................................................... –0.3V to 7V
CRT, VREF, WDI .............................–0.3V to (V
CC
+ 0.3V)
Reference Load Current (I
VREF
) .............................. ±1mA
V4 Input Current (–ADJ Mode) ..............................–1mA
RST , WDO, COMP1-6 Currents ...........................±10mA
Operating Temperature Range
LTC2931C ................................................ 0°C to 70°C
LTC2931I.............................................. –40°C to 85°C
LTC2931H .......................................... –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Notes 1, 2, 3)
F PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
COMP5
V5
COMP3
COMP1
V3
V1
CRT
RST
WDO
WDI
COMP6
V6
COMP2
COMP4
V2
V4
VREF
VPG
GND
CWT
T
JMAX
= 130°C, θ
JA
= 90°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2931CF#PBF LTC2931CF#TRPBF LTC2931F 20-Lead Plastic TSSOP 0°C to 70°C
LTC2931IF#PBF LTC2931IF#TRPBF LTC2931F 20-Lead Plastic TSSOP –40°C to 85°C
LTC2931HF#PBF LTC2931HF#TRPBF LTC2931F 20-Lead Plastic TSSOP –40°C to 125°C
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Minimum Internal Operating Voltage RST, COMP
n
in Correct Logic State
●
1V
V
CCMINP
Minimum Required for Mode Selection V
CC
Rising
●
2.4 V
V
CCMINC
Minimum Required for Comparators V
CC
Falling
●
2.3 V
V
RT50
5V, 5% Reset Threshold V1 Input Threshold
●
4.600 4.675 4.750 V
V
RT33
3.3V, 5% Reset Threshold V1, V2 Input Threshold
●
3.036 3.086 3.135 V
V
RT30
3V, 5% Reset Threshold V2 Input Threshold
●
2.760 2.805 2.850 V
V
RT25
2.5V, 5% Reset Threshold V2, V3 Input Threshold
●
2.300 2.338 2.375 V
V
RT18
1.8V, 5% Reset Threshold V3, V4 Input Threshold
●
1.656 1.683 1.710 V
V
RT15
1.5V, 5% Reset Threshold V3, V4 Input Threshold
●
1.380 1.403 1.425 V
V
RTA
ADJ Reset Threshold V3, V4, V5, V6 Input Threshold
●
492.5 500 507.5 mV
V
RTAN
–ADJ Reset Threshold V4 Input Threshold
●
–18 0 18 mV
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 5V, unless otherwise specifi ed. (Note 3)
LTC2931
3
2931fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Reference Voltage V
CC
≥ 2.3V, I
VREF
= ±1mA,
C
REF
≤ 1000pF
●
1.192 1.210 1.228 V
V
PG
Mode Selection Voltage Range V
CC
≥ V
CCMINP
●
0V
REF
V
I
VPG
VPG Input Current V
PG
= V
REF
●
±20 nA
I
V1
V1 Input Current V1 = 5V, I
VREF
= 12μA (Note 4)
●
52 75 μA
I
V2
V2 Input Current V2 = 3.3V
●
0.8 2 μA
I
V3
V3 Input Current V3 = 2.5V
V3 = 0.55V (ADJ Mode)
●
●
–15
0.52 1.2
15
μA
nA
I
V4
V4 Input Current V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = –0.02V (–ADJ Mode)
●
●
●
–15
–15
0.34 0.8
15
15
μA
nA
nA
I
V5
, I
V6
V5, V6 Input Current V5, V6 = 0.55V
●
–15 15 nA
I
CRT(UP)
CRT Pull-Up Current V
CRT
= GND
●
–1.4 –2 –2.6 μA
I
CRT(DN)
CRT Pull-Down Current V
CRT
= 1.3V
●
10 20 30 μA
t
RST
Reset Timeout Period C
RT
= 1500pF
●
234 ms
t
UV
V
n
Undervoltage Detect to RST or
COMP
n
V
n
Less Than Reset Threshold by More
than 1%
150 μs
V
OL
Voltage Output Low RST, COMP
n
I
SINK
= 3mA, V
CC
= 3V
I
SINK
= 100μA, V
CC
= 1V
●
●
0.15
0.05
0.4
0.3
V
V
I
COMPn
COMP
n
Pull-Up Current V
COMPn
= GND
●
–2 –6 –12 μA
V
OL
Voltage Output Low WDO I
SINK
= 3mA
●
0.15 0.4 V
V
OH
Voltage Output High RST, WDO, COMP
n
(Note 5)
I
SOURCE
= –1μA
●
V2-1 V
I
CWT(UP)
CWT Pull-Up Current V
CWT
= GND
●
–1.4 –2 –2.6 μA
I
CWT(DN)
CWT Pull-Down Current V
CWT
= 1.3V
●
10 20 30 μA
t
WD
Watchdog Timeout Period C
WT
= 1500pF
●
20 30 40 ms
V
IH
WDI Input Threshold High V
CC
= 3.3V to 5.5V
●
1.6 V
V
IL
WDI Input Threshold Low V
CC
= 3.3V to 5.5V
●
0.4 V
t
WP
WDI Input Pulse Width V
CC
= 3.3V
●
150 ns
I
WDI
WDI Pull-Up Current V
WDI
= 1V
●
–4 –10 –16 μA
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 currents into pins are positive, all voltages are referenced to GND
unless otherwise noted.
Note 3: The greater of V1, V2 is the internal supply voltage (V
CC
).
Note 4: Under static no-fault conditions, V1 will necessarily supply quiescent
current. If at any time V2 is larger than V1, V2 must be capable of supplying
the quiescent current, programming (transient) current and reference load
current.
Note 5: The output pins RST, WDO, and COMP
n
have diode protected internal
pull-ups to V2 of typically 6μA. However, external pull-up resistors may be used
when faster rise times are required or for V
OH
voltages greater than V2.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 5V, unless otherwise specifi ed. (Note 3)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC2931HF#TRPBF

Mfr. #:
Buy LTC2931HF#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Configurable Six-Input Supply Monitor with Watchdog
Lifecycle:
New from this manufacturer.
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