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FEATURES
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 VCC ≥ 1V
High Temperature Operation to 125°C
12-Lead 3mm × 3mm DFN Package
APPLICATIONS
Desktop and Notebook Computers
Multivoltage Systems
Telecom Equipment
Portable Battery-Powered Equipment
Network Servers
Automotive
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 VCC 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.
wwwT.DYataPShIeCetA4UL.comAPPLICATION
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
0.1μF
2150k 487k
1% 1%
124k
1%
121k
1%
100k 100k 16.2k
1% 1% 1%
V1
V2
V3
V4 LTC2930
V5
V6
VREF
VPG
GND
86.6k
1%
SYSTEM
LOGIC
RST
MR
CRT
CRT
47nF
MANUAL RESET
tRST = 94ms
2930 TA01
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
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LTC2930
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
V1, V2, V3, V4, V5, V6, VPG, RST................ –0.3V to 7V
CRT, VREF, MR...............................–0.3V to (VCC + 0.3V)
Reference Load Current (IVREF)..............................±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
PIN CONFIGURATION
TOP VIEW
V5 1
V3 2
V1 3
CRT 4
RST 5
MR 6
12 V6
11 V2
13 10 V4
9 VREF
8 VPG
7 GND
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 130°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) IS GND
(PCB CONNECTION OPTIONAL)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
LTC2930CDD#PBF
LTC2930CDD#TRPBF LDMJ
12-Lead 3mm × 3mm DFN
LTC2930IDD#PBF
LTC2930IDD#TRPBF
LDMJ
12-Lead 3mm × 3mm DFN
LTC2930HDD#PBF
LTC2930HDD#TRPBF LDMJ
12-Lead 3mm × 3mm DFN
*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/
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range,
www.DataSheet4U.com
otherwise
specifications
are
at
TA
=
25°C.
VCC
=
5V,
unless
otherwise
specified.
(Note
3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
VCC Minimum Internal Operating Voltage RST in Correct Logic State
1
VCCMINP
Minimum Required for Mode Selection VCC Rising
2.4
VRT50
5V, 5% Reset Threshold
V1 Input Threshold
4.600 4.675 4.750
VRT33
3.3V, 5% Reset Threshold
V1, V2 Input Threshold
3.036 3.086 3.135
VRT30
3V, 5% Reset Threshold
V2 Input Threshold
2.760 2.805 2.850
VRT25
2.5V, 5% Reset Threshold
V2, V3 Input Threshold
2.300 2.338 2.375
VRT18
1.8V, 5% Reset Threshold
V3, V4 Input Threshold
1.656 1.683 1.710
VRT15
1.5V, 5% Reset Threshold
V3, V4 Input Threshold
1.380 1.403 1.425
VRTA ADJ Reset Threshold
V3, V4, V5, V6 Input Threshold
492.5 500 507.5
VRTAN
–ADJ Reset Threshold
V4 Input Threshold
–18
0
18
VREF Reference Voltage
VCC ≥ 2.3V, IVREF = ±1mA, CREF ≤ 1000pF 1.192 1.210 1.228
VPG
Mode Selection Voltage Range
VCC ≥ VCCMINP
0
VREF
IVPG VPG Input Current
VPG = VREF
±20
UNITS
V
V
V
V
V
V
V
V
mV
mV
V
V
nA
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LTC2930
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
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IV1 V1 Input Current
V1 = 5V, IVREF = 12μA (Note 4)
52 75
μA
IV2 V2 Input Current
V2 = 3.3V
0.8 2
μA
IV3 V3 Input Current
V3 = 2.5V
V3 = 0.55V (ADJ Mode)
0.52 1.2
μA
±15 nA
IV4 V4 Input Current
V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = –0.02V (–ADJ Mode)
0.34 0.8
μA
±15 nA
±15 nA
IV5, IV6
V5, V6 Input Current
V5, V6 = 0.55V
±15 nA
ICRT(UP)
CRT Pull-Up Current
VCRT = GND
–1.4 –2 –2.6
μA
ICRT(DN)
CRT Pull-Down Current
VCRT = 1.3V
10 20 30
μA
tRST
tUV
VOL
VOH
VIL
VIH
tMRW
Reset Timeout Period
Vn 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
CRT = 1500pF
Vn Less Than Reset Threshold by More
than 1%
ISINK = 3mA, VCC = 3V
ISINK = 100μA, VCC = 1V
ISOURCE = –1μA
VCC = 3.3V to 5.5V
VCC = 3.3V to 5.5V
VCC = 3.3V
2
V2-1
1.6
150
3
150
0.15
0.05
4
0.4
0.3
0.4
ms
μs
V
V
V
V
V
ns
tMRD
Manual Reset Propagation Delay
VCC = 3.3V, VMR Falling
IMR MR Pull-Up Current
VMR = 1V
0.1 1
–4 –10 –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.
wwwNu.Dnoalteetsa2sS:ohAtehlleectru4wrUrise.cenotnsmoitnetdo.pins are positive, all voltages are referenced to GND
Note 3: The greater of V1, V2 is the internal supply voltage (VCC).
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 VOH voltages greater than V2.
TIMING DIAGRAM
Vn VRT
tUV
RST
MR
Vn Monitor Timing
tRST tMRD
tRST
tMRW
2930 TD
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LTC2930
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized Threshold Voltages
vs Temperature
1.015
1.010
1.005
1.000
0.995
0.990
0.985
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
2930 G01
Supply Current vs Temperature
70
V1 = 5V
V2 = 3.3V
65 V3 = 2.5V
V4 = 1.8V
V5 = V6 = 1V
60
55
50
45
www.Data4S0 heet4U.com
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
2930 G04
Transient Duration vs Comparator
Overdrive (V3, V4, V5, V6)
450
TA = 25°C
375
300
RESET OCCURS ABOVE CURVE
225
150
75
0
0.1 1
10 100
RESET COMPARATOR OVERDRIVE (% OF VRTX)
2930 G07
–ADJ Threshold Voltage
vs Temperature
18
12
6
0
–6
–12
–18
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
2930 G02
I(V4) vs V4 in Negative
Adjust Mode
–100μ
–10μ
–1μ
125°C
–100n
–10n
90°C
–1n
–100p
–300
–250
25°C
–200 –150 –100
V4 (mV)
–50 0
2930 G05
RST Output Voltage
vs V1, VPG = GND
6
TA = 25°C
10k PULL-UP FROM RST TO V1
5
4
3
2
1
0
01
23
V1 (V)
45
2930 G08
4
VREF vs Temperature
1.228
1.222
1.216
1.210
1.204
1.198
1.192
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
2930 G03
Transient Duration vs Comparator
Overdrive (V1,V2)
300
TA = 25°C
250
200
RESET OCCURS ABOVE CURVE
150
100
50
0
0.1 1
10 100
RESET COMPARATOR OVERDRIVE (% OF VRTX)
2930 G06
Reset Timeout Period
vs Temperature
5 CRT = 1500pF
(SILVER MICA)
4
3
2
1
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
2930 G09
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LTC2930
TYPICAL PERFORMANCE CHARACTERISTICS
Reset Timeout Period vs CRT
10
TA = 25°C
1
100m
10m
1m
100μ
10μ
10p 100p
1n 10n
CRT (F)
100n 1μ
2930 G10
Voltage Output Low
vs Output Sink Current (RST)
500
V1 = 5V
V2 = 3V
400
125°C
85°C
300
25°C
200
–40°C
100
www.DataSheet4U.com0 0 2 4 6 8 10
ISINK (mA)
2930 G12
ISINK vs Supply Voltage (RST)
15
TA = 25°C
12
VOL = 0.4V
9
VOL = 0.2V
6
3
0
012345
V1 OR V2 (V)
2930 G11
RST Pull-Up Current vs V2
18
TA = 25°C
15
12
9
6 VRT33
VRT30
3 VRT25
0
2.0 2.5 3.0 3.5 4.0
V2 (V)
4.5 5.0
2930 G13
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 VCC 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 (CRT) 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.
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