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Linear Technology Electronic Components Datasheet

LTC2931 Datasheet

Confi gurable Six Supply Monitor

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LTC2931 pdf
LTC2931
FEATURES
Configurable Six Supply
Monitor with Adjustable Reset
and Watchdog Timers
DESCRIPTION
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 VCC ≥ 1V
High Temperature Operation to 125°C
20-Lead TSSOP Package
APPLICATIONS
Desktop and Notebook Computers
Multivoltage Systems
Telecom Equipment
Portable Battery-Powered Equipment
Network Servers
Automotive
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TYPICAL APPLICATION
Six Supply Monitor 12V (ADJ), 5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ)
12V
5V
3.3V SYSTEM
2.5V LOGIC
1.8V
1.2V
10k
2150k 124k
1% 1%
0.1μF
0.1μF
100k 100k
1% 1% R1
59k
1%
R2
40.2k
1%
V1
V2
V3
V4
V5
V6
VREF
VPG
GND
POWER
GOOD
LTC2931
WDI
WDO
RST
2931 TA01
tRST = 94ms
CWT CRT tWD = 940ms
CWT
47nF
CRT
47nF
The LTC®2931 is a configurable 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 VCC down to 1V. Each status output has
a weak internal pull-up and may be externally pulled up
to a user defined voltage.
The 52μA supply current makes the LTC2931 ideal for
power conscious systems and it may be configured to
monitor fewer than six inputs.
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.
Voltage Threshold Configuration Table
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
2931fb
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Linear Technology Electronic Components Datasheet

LTC2931 Datasheet

Confi gurable Six Supply Monitor

No Preview Available !

LTC2931 pdf
LTC2931
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
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 (VCC + 0.3V)
Reference Load Current (IVREF)..............................±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
PIN CONFIGURATION
TOP VIEW
COMP5 1
V5 2
COMP3 3
COMP1 4
V3 5
V1 6
CRT
RST
WDO
7
8
9
WDI 10
20 COMP6
19 V6
18 COMP2
17 COMP4
16 V2
15 V4
14 VREF
13 VPG
12 GND
11 CWT
F PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 130°C, θJA = 90°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC2931CF#PBF
LTC2931CF#TRPBF
LTC2931F
20-Lead Plastic TSSOP
LTC2931IF#PBF
LTC2931IF#TRPBF
LTC2931F
20-Lead Plastic TSSOP
LTC2931HF#PBF
LTC2931HF#TRPBF
LTC2931F
20-Lead Plastic TSSOP
Consult LTC Marketing for information on non-standard lead based finish 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/
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
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ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, unless otherwise specified. (Note 3)
SYMBOL
VCC
VCCMINP
VCCMINC
VRT50
VRT33
VRT30
VRT25
VRT18
VRT15
VRTA
VRTAN
PARAMETER
Minimum Internal Operating Voltage
Minimum Required for Mode Selection
Minimum Required for Comparators
5V, 5% Reset Threshold
3.3V, 5% Reset Threshold
3V, 5% Reset Threshold
2.5V, 5% Reset Threshold
1.8V, 5% Reset Threshold
1.5V, 5% Reset Threshold
ADJ Reset Threshold
–ADJ Reset Threshold
CONDITIONS
RST, COMPn in Correct Logic State
VCC Rising
VCC Falling
V1 Input Threshold
V1, V2 Input Threshold
V2 Input Threshold
V2, V3 Input Threshold
V3, V4 Input Threshold
V3, V4 Input Threshold
V3, V4, V5, V6 Input Threshold
V4 Input Threshold
MIN
4.600
3.036
2.760
2.300
1.656
1.380
492.5
–18
TYP
4.675
3.086
2.805
2.338
1.683
1.403
500
0
MAX
1
2.4
2.3
4.750
3.135
2.850
2.375
1.710
1.425
507.5
18
UNITS
V
V
V
V
V
V
V
V
V
mV
mV
2931fb
2


Part Number LTC2931
Description Confi gurable Six Supply Monitor
Maker Linear Technology
Total Page 16 Pages
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