FEATURES
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LTC2932
Configurable Six Supply
Monitor with Adjustable Reset
Timer and Supply Tolerance
DESCRIPTION
The LTC
®
2932 is a configurable supply monitor for sys-
tems 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 digitally
configurable to 5%, 7.5%, 10%, or 12.5% below the
nominal operating voltage. The LTC2932 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 timeout period is adjustable using an external
capacitor. The
RST
output is guaranteed to be in the
correct state for V
CC
down to 1V and may be disabled
during supply margin testing. Each status output has a
weak internal pull-up and may be externally pulled up to
an external voltage.
The 52μA supply current makes the LTC2932 ideal for
power conscious systems and the part may be configured
to monitor less 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, 7119714, 7239251.
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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%
Selectable Supply Tolerances: 5%, 7.5%, 10%,
12.5% Below Monitored Voltage
Reset Disable Pin for Margining Applications
Low Supply Current: 52μA
Power Supply Glitch Immunity
Guaranteed
RST
for V
CC
≥ 1V
High Temperature Operation to 125°C
20-Lead TSSOP Package
APPLICATIONS
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Desktop and Notebook Computers
Multivoltage Systems
Telecom Equipment
Portable Battery-Powered Equipment
Network Servers
Automotive
TYPICAL APPLICATION
Six Supply Monitor 12V (ADJ),
5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ)
12V
5V
3.3V
2.5V
1.8V
1.2V
10k
2150k
1%
124k
1%
COMP1
COMP2
COMP3
COMP4
COMP5
V1
V2
0.1μF
0.1μF
100k
1%
100k
1% R1
59k
1%
R2
40.2k
1%
V3
V4
V5
V6
VREF
VPG
GND
T0
T1
CRT
RST
2932 TA01
Voltage Threshold Configuration Table
V1 (V)
5
5
SYSTEM
LOGIC
V2 (V)
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3
3
3
2.5
2.5
2.5
2.5
2.5
2.5
V3 (V)
2.5
2.5
2.5
1.8
1.8
ADJ
ADJ
2.5
1.8
ADJ
1.8
1.8
1.8
1.5
ADJ
ADJ
V4 (V)
1.8
1.5
ADJ
ADJ
–ADJ
ADJ
–ADJ
ADJ
ADJ
ADJ
1.5
ADJ
–ADJ
ADJ
ADJ
–ADJ
V5 (V)
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
V6 (V)
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
2932fb
5
5
5
5
5
5
5
5
POWER
GOOD
COMP6
LTC2932
RDIS
3.3
3.3
3.3
3.3
3.3
3.3
t
RST
= 94ms
C
RT
47nF
1
LTC2932
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
PIN CONFIGURATION
TOP VIEW
COMP5
V5
COMP3
COMP1
V3
V1
CRT
RST
T0
1
2
3
4
5
6
7
8
9
20 COMP6
19 V6
18 COMP2
17 COMP4
16 V2
15 V4
14 VREF
13 VPG
12 GND
11 T1
V1, V2, V3, V4, V5, V6, VPG ........................ –0.3V to 7V
RST,
COMP1-6, T0, T1................................. –0.3V to 7V
CRT, VREF
RDIS
............................–0.3V to (V
CC
+ 0.3V)
,
Reference Load Current (I
VREF
) ..............................±1mA
V4 Input Current (–ADJ Mode) ..............................–1mA
RST,
COMP1-6 Currents ......................................±10mA
Operating Temperature Range
LTC2932C ................................................ 0°C to 70°C
LTC2932I..............................................– 40°C to 85°C
LTC2932H ..........................................– 40°C to 125°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
RDIS
10
F PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 130°C,
θ
JA
= 90°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC2932F#PBF
LTC2932F#PBF
LTC2932F#PBF
TAPE AND REEL
LTC2932CF#TRPBF
LTC2932IF#TRPBF
LTC2932HF#TRPBF
PART MARKING*
LTC2932F
LTC2932F
LTC2932F
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for information on non-standard lead based finish parts. *Temperature grades are identified by a label on the shipping container.
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
V
CC
V
CCMINP
V
CCMINC
V
RT50
PARAMETER
Minimum Internal Operating Voltage
Minimum Required for Mode Selection
Minimum Required for Comparators
5V, 5% Reset Threshold
5V, 7.5% Reset Threshold
5V, 10% Reset Threshold
5V, 12.5% Reset Threshold
3.3V, 5% Reset Threshold
3.3V, 7.5% Reset Threshold
3.3V, 10% Reset Threshold
3.3V, 12.5% Reset Threshold
3V, 5% Reset Threshold
3V, 7.5% Reset Threshold
3V, 10% Reset Threshold
3V, 12.5% Reset Threshold
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise specified. (Note 3)
CONDITIONS
RST,
COMP
n
in Correct Logic State
V
CC
Rising
V
CC
Falling
V1 Input Threshold
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
MAX
1
2.4
2.3
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
2932fb
4.600
4.475
4.350
4.225
3.036
2.954
2.871
2.789
2.760
2.685
2.610
2.535
4.675
4.550
4.425
4.300
3.086
3.003
2.921
2.838
2.805
2.730
2.655
2.580
4.750
4.625
4.500
4.375
3.135
3.053
2.970
2.888
2.850
2.775
2.700
2.625
V
RT33
V1, V2 Input Threshold
V
RT30
V2 Input Threshold
2
LTC2932
ELECTRICAL CHARACTERISTICS
SYMBOL
V
RT25
PARAMETER
2.5V, 5% Reset Threshold
2.5V, 7.5% Reset Threshold
2.5V, 10% Reset Threshold
2.5V, 12.5% Reset Threshold
1.8V, 5% Reset Threshold
1.8V, 7.5% Reset Threshold
1.8V, 10% Reset Threshold
1.8V, 12.5% Reset Threshold
1.5V, 5% Reset Threshold
1.5V, 7.5% Reset Threshold
1.5V, 10% Reset Threshold
1.5V, 12.5% Reset Threshold
ADJ, 5% Reset Threshold
ADJ, 7.5% Reset Threshold
ADJ, 10% Reset Threshold
ADJ, 12.5% Reset Threshold
–ADJ Reset Threshold
Reference Voltage
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise specified. (Note 3)
CONDITIONS
V2, V3 Input Threshold
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
2.300
2.238
2.175
2.113
1.656
1.611
1.566
1.521
1.380
1.343
1.305
1.268
492.5
479.4
466.3
453.1
–18
1.192
1.160
1.128
1.096
0
TYP
2.338
2.275
2.213
2.150
1.683
1.638
1.593
1.548
1.403
1.365
1.328
1.290
500.0
486.6
473.3
459.9
0
1.210
1.178
1.146
1.113
MAX
2.375
2.313
2.250
2.188
1.710
1.665
1.620
1.575
1.425
1.388
1.350
1.313
507.5
494
480.4
466.8
18
1.228
1.195
1.163
1.130
V
REF
±20
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
V
V
V
V
V
nA
μA
μA
μA
nA
μA
nA
nA
nA
μA
μA
μA
ms
μs
V
RT18
V3, V4 Input Threshold
V
RT15
V3, V4 Input Threshold
V
RTA
V3, V4, V5, V6 Input Threshold
V
RTAN
V
REF
V4 Input Threshold
V
CC
≥ 2.3V, I
VREF
= ±1mA, C
REF
≤ 1000pF
T0 Low, T1 Low
T0 Low, T1 High
T0 High, T1 Low
T0 High, T1 High
V
CC
≥ V
CCMINP
V
PG
= V
REF
V1 = 5V, I
VREF
= 12μA (Note 4)
V2 = 3.3V
V3 = 2.5V
V3 = 0.55V (ADJ Mode)
V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = –0.02V (–ADJ Mode)
V5, V6 = 0.55V
V
CRT
= GND
V
CRT
= 1.3V
V
COMPn
= GND
C
RT
= 1500pF
V
n
Less Than Reset Threshold by More
than 1%
I
SINK
= 3mA, V
CC
= 3V
I
SINK
= 100μA, V
CC
= 1V
I
SOURCE
= –1μA
V
PG
I
VPG
I
V1
I
V2
I
V3
I
V4
Mode Selection Voltage Range
VPG Input Current
V1 Input Current
V2 Input Current
V3 Input Current
V4 Input Current
52
0.8
0.52
0.34
75
2
1.2
±15
0.8
±15
±15
±15
–2.6
30
–12
4
I
V5
, I
V6
I
CRT(UP)
I
CRT(DN)
I
COMPn
t
RST
t
UV
V
OL
V
OH
V5, V6 Input Current
CRT Pull-Up Current
CRT Pull-Down Current
COMP
n
Pull-Up Current
Reset Timeout Period
V
n
Undervoltage Detect to
RST
or
COMP
n
Voltage Output Low
RST,
COMP
n
Voltage Output High
RST,
COMP
n
(Note 5)
–1.4
10
–2
2
–2
20
–6
3
150
●
●
●
0.15
0.05
V2-1
0.4
0.3
V
V
V
2932fb
3
LTC2932
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IL
V
IH
I
INTOL
V
IL
V
IH
I
RDIS
PARAMETER
T0, T1 Low Level Input Voltage
T0, T1 High Level Input Voltage
T0, T1 Input Current
RDIS
Input Threshold Low
RDIS
Input Threshold High
RDIS
Pull-Up Current
Digital Inputs T0, T1,
RDIS
V
CC
= 3.3V to 5.5V
V
CC
= 3.3V to 5.5V
T0, T1 = 2V
V
CC
= 3.3V to 5.5V
V
CC
= 3.3V to 5.5V
V
RDIS
= 1V
●
●
●
●
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise specified. (Note 3)
CONDITIONS
MIN
TYP
MAX
0.3V
CC
0.7V
CC
±0.1
1.6
–4
–10
–16
±1
0.4
UNITS
V
V
μA
V
V
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
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.
TIMING DIAGRAM
V
n
Monitor Timing
V
n
V
RT
t
UV
RST
t
RST
2932 TD
COMP
n
2932fb
4
LTC2932
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized Threshold Voltages
vs Temperature
NORMALIZED THRESHOLD VOLTAGES (V/V)
1.015
1.010
1.005
1.000
0.995
0.990
0.985
–50 –25
THRESHOLD VOLTAGE, V
RTAN
(mV)
18
12
6
0
–6
–12
–18
–50 –25
–ADJ Threshold Voltage
vs Temperature
1.228
1.222
1.216
V
REF
(V)
1.210
1.204
1.198
V
REF
vs Temperature
50
25
75
0
TEMPERATURE (°C)
100
125
50
25
75
0
TEMPERATURE (°C)
100
125
1.192
–50 –25
50
75
25
0
TEMPERATURE (°C)
100
125
2932 G01
2932 G02
2932 G03
Supply Current vs Temperature
70
V1 = 5V
V2 = 3.3V
65 V3 = 2.5V
V4 = 1.8V
V5 = V6 = 1V
60
I
V4
(A)
55
50
45
40
–50 –25
–100μ
–10μ
–1μ
–100n
–10n
–1n
I(V4) vs V4 in Negative
Adjust Mode
300
TYPICAL TRANSIENT DURATION (μs)
250
200
Transient Duration vs Comparator
Overdrive (V1,V2)
T
A
= 25°C
SUPPLY CURRENT, I
V1
(μA)
125°C
RESET OCCURS ABOVE CURVE
150
100
50
0
0.1
1
10
100
RESET COMPARATOR OVERDRIVE (% OF V
RTX
)
2932 G06
90°C
25°C
50
25
75
0
TEMPERATURE (°C)
100
125
–100p
–300
–250
–200
–150 –100
V4 (mV)
–50
0
2932 G05
2932 G04
Transient Duration vs Comparator
Overdrive (V3, V4, V5, V6)
450
TYPICAL TRANSIENT DURATION (μs)
375
RST
OUTPUT VOLTAGE (V)
300
RESET OCCURS ABOVE CURVE
225
150
75
0
0.1
1
10
100
RESET COMPARATOR OVERDRIVE (% OF V
RTX
)
2932 G07
RST
Output Voltage
vs V1, V
PG
= GND
6
5
4
3
2
1
0
0
1
2
V1 (V)
2932 G08
Reset Timeout Period
vs Temperature
5
RESET TIMEOUT PERIOD, t
RST
(ms)
C
RT
= 1500pF
(SILVER MICA)
T
A
= 25°C
T
A
= 25°C
10k PULL-UP FROM
RST
TO V1
4
3
2
3
4
5
1
–50
–25
75
0
25
50
TEMPERATURE (°C)
100
125
2932 G09
2932fb
5
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