FEATURES
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LTC2930
Configurable Six Supply
Monitor with Adjustable
Reset Timer, Manual Reset
DESCRIPTION
The LTC
®
2930 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 LTC2930 also features
adjustable inputs with a 0.5V nominal threshold.
The reset timeout period is adjustable using an external
capacitor. A reset event may be generated with a manual
reset button on the manual reset input. 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
and may be externally pulled up to an external voltage.
The 52μA supply current makes the LTC2930 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, 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 ±1.5% Threshold Accuracy
Adjustable Reset Timeout
Low Supply Current: 52μA
Manual Reset Pin
Power Supply Glitch Immunity
Guaranteed
RST
for V
CC
≥ 1V
High Temperature Operation to 125°C
12-Lead 3mm
×
3mm DFN 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, 5% Threshold
12V, 5V, 3.3V, 1.8V, 1.2V, –5.2V
12V
5V
3.3V
1.8V
1.2V
–5.2V
2150k
1%
487k
1%
Voltage Threshold Configuration Table
V1 (V)
5.0
SYSTEM
LOGIC
V2 (V)
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.0
3.0
3.0
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
2930fa
5.0
5.0
5.0
5.0
V1
V2
V3
V4
V5
V6
MR
VREF
VPG
GND
CRT
MANUAL RESET
C
RT
47nF
2930 TA01
5.0
RST
LTC2930
5.0
5.0
5.0
5.0
3.3
3.3
3.3
3.3
3.3
3.3
0.1μF
124k
1%
121k
1%
100k
1%
100k
1%
16.2k
1%
86.6k
1%
t
RST
= 94ms
1
LTC2930
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
PIN CONFIGURATION
TOP VIEW
V5
V3
V1
CRT
RST
MR
1
2
3
4
5
6
13
12 V6
11 V2
10 V4
9 VREF
8 VPG
7 GND
V1, V2, V3, V4, V5, V6, VPG,
RST
................ –0.3V to 7V
CRT, VREF
MR
...............................–0.3V to (V
CC
+ 0.3V)
,
Reference Load Current (I
VREF
) ..............................±1mA
V4 Input Current (–ADJ Mode) ..............................–1mA
RST
Current .........................................................±10mA
Operating Temperature Range
LTC2930C ................................................ 0°C to 70°C
LTC2930I.............................................. –40°C to 85°C
LTC2930H .......................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
DD PACKAGE
12-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 130°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) IS GND
(PCB CONNECTION OPTIONAL)
ORDER INFORMATION
LEAD FREE FINISH
LTC2930CDD#PBF
LTC2930IDD#PBF
LTC2930HDD#PBF
TAPE AND REEL
LTC2930CDD#TRPBF
LTC2930IDD#TRPBF
LTC2930HDD#TRPBF
PART MARKING*
LDMJ
LDMJ
LDMJ
PACKAGE DESCRIPTION
12-Lead 3mm
×
3mm DFN
12-Lead 3mm
×
3mm DFN
12-Lead 3mm
×
3mm DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
*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/
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
RT50
V
RT33
V
RT30
V
RT25
V
RT18
V
RT15
V
RTA
V
RTAN
V
REF
V
PG
I
VPG
PARAMETER
Minimum Internal Operating Voltage
Minimum Required for Mode Selection
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
Reference Voltage
Mode Selection Voltage Range
VPG Input Current
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
in Correct Logic State
V
CC
Rising
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
V
CC
≥ 2.3V, I
VREF
= ±1mA, C
REF
≤ 1000pF
V
CC
≥ V
CCMINP
V
PG
= V
REF
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
MAX
1
2.4
UNITS
V
V
V
V
V
V
V
V
mV
mV
V
V
nA
4.600
3.036
2.760
2.300
1.656
1.380
492.5
–18
1.192
0
4.675
3.086
2.805
2.338
1.683
1.403
500
0
1.210
4.750
3.135
2.850
2.375
1.710
1.425
507.5
18
1.228
V
REF
±20
2930fa
2
LTC2930
ELECTRICAL CHARACTERISTICS
SYMBOL
I
V1
I
V2
I
V3
I
V4
PARAMETER
V1 Input Current
V2 Input Current
V3 Input Current
V4 Input Current
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
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
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
CC
= 3.3V to 5.5V
V
CC
= 3.3V to 5.5V
V
CC
= 3.3V
V
CC
= 3.3V, V
MR
Falling
V
MR
= 1V
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
52
0.8
0.52
0.34
MAX
75
2
1.2
±15
0.8
±15
±15
±15
–2.6
30
4
UNITS
μA
μA
μA
nA
μA
nA
nA
nA
μA
μA
ms
μs
I
V5
, I
V6
I
CRT(UP)
I
CRT(DN)
t
RST
t
UV
V
OL
V
OH
V
IL
V
IH
t
MRW
t
MRD
I
MR
V5, V6 Input Current
CRT Pull-Up Current
CRT Pull-Down Current
Reset Timeout Period
V
n
Undervoltage Detect to
RST
Voltage Output Low
RST
Voltage Output High
RST
(Note 5)
MR
Input Threshold Low
MR
Input Threshold High
MR
Input Pulse Width
Manual Reset Propagation Delay
MR
Pull-Up Current
–1.4
10
2
–2
20
3
150
0.15
0.05
0.4
0.3
0.4
V
V
V
V
V
ns
V2-1
1.6
150
0.1
–4
–10
1
–16
μs
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 pin
RST
has a diode protected internal pull-up to V2 of
typically 6μA. However, an external pull-up resistor 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
t
MRD
t
RST
2930 TD
MR
t
MRW
2930fa
3
LTC2930
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
V
REF
(V)
–ADJ Threshold Voltage
vs Temperature
1.228
1.222
1.216
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
25
75
0
TEMPERATURE (°C)
100
125
2930 G01
2930 G02
2930 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
)
2930 G06
90°C
25°C
50
25
75
0
TEMPERATURE (°C)
100
125
–100p
–300
–250
–200
–150 –100
V4 (mV)
–50
0
2930 G05
2930 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
)
2930 G07
RST
Output Voltage
vs V1, V
PG
= GND
6
5
4
3
2
1
0
0
1
2
V1 (V)
2930 G08
Reset Timeout Period
vs Temperature
5
RESET TIMEOUT PERIOD, t
RST
(ms)
4
5
C
RT
= 1500pF
(SILVER MICA)
T
A
= 25°C
T
A
= 25°C
10k PULL-UP FROM
RST
TO V1
4
3
2
3
1
–50
–25
75
0
25
50
TEMPERATURE (°C)
100
125
2930 G09
2930fa
4
LTC2930
TYPICAL PERFORMANCE CHARACTERISTICS
Reset Timeout Period vs C
RT
10
RESET TIMEOUT PERIOD t
RST
(s)
1
100m
10m
1m
100μ
10μ
10p
3
I
SINK
(mA)
9
V
OL
= 0.2V
6
T
A
= 25°C
15
I
SINK
vs Supply Voltage (RST)
T
A
= 25°C
12
V
OL
= 0.4V
100p
1n
10n
C
RT
(F)
100n
1μ
2930 G10
0
0
1
3
2
V1 OR V2 (V)
4
5
2930 G11
Voltage Output Low
vs Output Sink Current (RST)
500
V1 = 5V
V2 = 3V
18
125°C
85°C
V
OL
(mV)
300
25°C
200
–40°C
100
PULL-UP CURRENT (μA)
15
12
9
6
RST
Pull-Up Current vs V2
T
A
= 25°C
400
V
RT33
V
RT30
3 V
RT25
0
0
2
6
4
I
SINK
(mA)
8
10
0
2.0
2.5
3.0
3.5
V2 (V)
4.0
4.5
5.0
2930 G13
2930 G12
PIN FUNCTIONS
V5 (Pin 1):
Adjustable Voltage Input 5. High impedance
comparator input with 0.5V typical threshold. See
Applications Information for details. Tie to V1 if unused.
V3 (Pin 2):
Voltage Input 3. Select from 2.5V, 1.8V, 1.5V,
or ADJ. See Applications Information for details. Tie to
V1 if unused.
V1 (Pin 3):
Voltage Input 1. Select from 5V or 3.3V. See
Applications Information for details. The greater of V1 or
V2 is also V
CC
for the device. Bypass this pin to ground
with a 0.1μF (or greater) capacitor.
CRT (Pin 4):
Reset Timeout Capacitor. Attach an external
.
capacitor (C
RT
) to GND to set a reset timeout of 2ms/nF
Leaving the pin open generates a minimum delay of
approximately 25μs. A 47nF capacitor generates a 94ms
reset delay time.
RST
(Pin 5):
Reset Output. Logic output with weak 6μA
pull-up to V2. Pulls low when any voltage input is below
the reset threshold and held low for the configured delay
time after all voltage inputs are above threshold. Use an
external pull-up to pull greater than V2. Leave open if
unused.
2930fa
5
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