LINER LTC2913IDD-1 Dual uv/ov voltage monitor Datasheet

LTC2913
Dual UV/OV
Voltage Monitor
FEATURES
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■
■
■
■
■
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DESCRIPTION
Monitors Two Voltages Simultaneously
Adjustable UV and OV Trip Values
Guaranteed Threshold Accuracy: ±1.5%
Input Glitch Rejection
Adjustable Reset Timeout with Disable
55µA Quiescent Current
Open-Drain OV and UV Outputs
Guaranteed OV and UV for VCC ≥ 1V
Available in 10-Lead MSOP and (3mm × 3mm)
DFN Packages
APPLICATIONS
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■
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The LTC®2913 is a dual input voltage monitor intended for
multiple voltages in a variety of applications. Dual inputs for
each voltage allow monitoring two separate undervoltage
(UV) conditions and two separate overvoltage (OV)
conditions. All monitors share a common undervoltage
output and a common overvoltage output. The LTC2913-1
has latching capability for the overvoltage output. The
LTC2913-2 has functionality to disable both the overvoltage
and undervoltage outputs.
Glitch filtering ensures reliable reset operation without
false or noisy triggering.
The LTC2913 provides a precise, versatile, space-conscious, micropower solution for voltage monitoring.
Desktop and Notebook Computers
Network Servers
Core, I/O Voltage Monitors
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Dual OV/UV Supply Monitor
Typical Transient Duration
vs Comparator Overdrive
5V
POWER
3.3V
SUPPLIES
0.1 F
44.2k
1k
27.4k
VCC
VH1
LTC2913-1
VL1
VH2
4.53k
SYSTEM
OV
UV
1k
4.53k
VL2
GND
LATCH
TMR
22nF
2913 TA01a
TIMEOUT = 200ms
TYPICAL TRANSIENT DURATION (µs)
700
600
500
RESET OCCURS
ABOVE CURVE
400
300
200
100
VCC = 6V
VCC = 2.3V
0
0.1
100
1
10
COMPARATOR OVERDRIVE PAST THRESHOLD (%)
2913 G05
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LTC2913
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Terminal Voltages
VCC (Note 3)............................................. –0.3V to 6V
OV, UV ................................................... –0.3V to 16V
TMR ..........................................–0.3V to (VCC + 0.3V)
VHn, VLn, LATCH, DIS .......................... –0.3V to 7.5V
Terminal Currents
IVCC ..................................................................+10mA
IUV, IOV ...............................................................10mA
Operating Temperature Range
LTC2913C ................................................ 0°C to 70°C
LTC2913I ............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
TOP VIEW
VH1
VL1
VH2
VL2
GND
10
9
8
7
6
1
2
3
4
5
VCC
TMR
LATCH
UV
OV
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 120°C/W
10 VCC
VH1
1
VL1
2
VH2
3
VL2
4
7 UV
GND
5
6 OV
9 TMR
11
8 LATCH
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
ORDER PART NUMBER
MS PART MARKING*
ORDER PART NUMBER
DD PART MARKING*
LTC2913CMS-1
LTC2913IMS-1
LTCKK
LTCKK
LTC2913CDD-1
LTC2913IDD-1
LCKN
LCKN
TOP VIEW
TOP VIEW
VH1
VL1
VH2
VL2
GND
1
2
3
4
5
10
9
8
7
6
VCC
TMR
DIS
UV
OV
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 120°C/W
10 VCC
VH1
1
VL1
2
VH2
3
VL2
4
7 UV
GND
5
6 OV
9 TMR
11
8 DIS
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
ORDER PART NUMBER
MS PART MARKING*
ORDER PART NUMBER
DD PART MARKING*
LTC2913CMS-2
LTC2913IMS-2
LTCKM
LTCKM
LTC2913CDD-2
LTC2913IDD-2
LCKP
LCKP
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
*The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
2913fa
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LTC2913
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V, VLn = 0.45V, VHn = 0.55V, LATCH = VCC,
DIS = Open unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
VSHUNT
VCC Shunt Regulator Voltage
ICC = 5mA
●
MIN
ΔVSHUNT
VCC Shunt Regulator Load Regulation
ICC = 2mA to 10mA
●
VCC
Supply Voltage (Note 3)
VCCR(MIN)
Minimum VCC Output Valid
DIS = 0V
●
VCC(UVLO)
Supply Undervoltage Lockout
DIS = 0V, VCC Rising
●
1.9
ΔVCC(UVHYST)
Supply Undervoltage Lockout Hysteresis
DIS = 0V
●
5
ICC
Supply Current
VCC = 2.3V to 6V
●
VUOT
Undervoltage/Overvoltage Threshold
tUOD
Undervoltage/Overvoltage Threshold to
Output Delay
IVHL
VHn, VLn Input Current
tUOTO
UV/OV Time-Out Period
VLATCH(VIH)
VLATCH(VIL)
ILATCH
LATCH Input Current
VDIS(VIH)
DIS Input High
●
VDIS(VIL)
DIS Input Low
●
IDIS
DIS Input Current
VDIS > 0.5V
●
1
ITMR(UP)
TMR Pull-Up Current
VTMR = 0V
●
–1.3
ITMR(DOWN)
TMR Pull-Down Current
VTMR = 1.6V
●
1.3
2.1
VTMR(DIS)
Timer Disable Voltage
Referenced to VCC
●
–180
–270
VOH
Output Voltage High UV/OV
VCC = 2.3V, IUV/OV = –1µA
●
1
VOL
Output Voltage Low UV/OV
VCC = 2.3V, IUV/OV = 2.5mA
VCC = 1V, IUV = 100µA
●
●
●
VHn = VUOT – 5mV or VLn = VUOT + 5mV
6.2
TYP
UNITS
6.6
6.9
V
200
300
mV
2.3
VSHUNT
V
1
V
2
2.1
V
25
50
mV
55
80
µA
●
492
500
508
mV
●
50
125
500
µs
±15
nA
12.5
ms
●
CTMR = 1nF
MAX
●
6
OV Latch Clear Input High
●
1.2
OV Latch Clear Input Low
●
0.8
V
●
±1
µA
VLATCH > 0.5V
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.
8.5
V
1.2
V
0.8
V
2
3
µA
–2.1
–2.8
µA
2.8
µA
mV
V
0.1
0.01
0.3
0.15
V
V
Note 3: VCC maximum pin voltage is limited by input current. Since the
VCC pin has an internal 6.5V shunt regulator, a low impedance supply that
exceeds 6V may exceed the rated terminal current. Operation from higher
voltage supplies requires a series dropping resistor. See Applications
Information.
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LTC2913
TIMING DIAGRAMS
VHn Monitor Timing
VLn Monitor Timing
VUOT
VHn
tUOD
UV
tUOTO
tUOD
1V
OV
2913 TD01
UV
1V
VLn Monitor Timing (TMR Pin Strapped to VCC)
VUOT
VUOT
VLn
tUOD
tUOTO
2913 TD02
VHn Monitor Timing (TMR Pin Strapped to VCC)
VHn
VUOT
VLn
tUOD
tUOD
1V
OV
tUOD
1V
2913 TD03
2913 TD04
TYPICAL PERFORMANCE CHARACTERISTICS
Specifications are at TA = 25°C, VCC = 3.3V unless otherwise noted.
70
0.504
65
0.503
60
0.502
55
0.501
50
0.500
0.499
40
35
0.497
30
0.496
25
25
50
0
TEMPERATURE (°C)
75
6.7
10mA
VCC = 3.3V
6.6
5mA
6.5
2mA
6.4
1mA
6.3
200µA
VCC = 2.3V
20
–50
100
VCC = 6V
45
0.498
–25
6.8
VCC (V)
0.505
0.495
–50
–25
25
50
0
TEMPERATURE (°C)
2913 G01
75
6.2
–50
100
6.75
–40°C
6.35
25°C
85°C
–2
0
2
6
4
ICC (mA)
8
10
12
2913 G04
VCC
600
0.6
500
RESET OCCURS
ABOVE CURVE
400
300
200
100
100
0.8
UV VOLTAGE (V)
TYPICAL TRANSIENT DURATION (µs)
VCC (V)
6.45
75
UV Output Voltage vs VCC
700
6.55
0
25
50
TEMPERATURE (°C)
2913 G03
Typical Transient Duration
vs Comparator Overdrive
6.65
–25
2913 G02
VCC Shunt Voltage vs ICC
6.25
VCC Shunt Voltage
vs Temperature
Supply Current vs Temperature
ICC (µA)
TRHESHOLD VOLTAGE, VUOT (V)
Input Threshold Voltage
vs Temperature
0.4
UV WITH
10k PULL-UP
0.2
VCC = 6V
UV WITHOUT
PULL-UP
VCC = 2.3V
0
0.1
100
1
10
COMPARATOR OVERDRIVE PAST THRESHOLD (%)
2913 G05
0
0
0.2
0.6
0.8
0.4
SUPPLY VOLTAGE, VCC (V)
1.0
2913 G06
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LTC2913
TYPICAL PERFORMANCE CHARACTERISTICS
Specifications are at TA = 25°C, VCC = 3.3V unless otherwise noted.
UV Output Voltage vs VCC
5
PULL-DOWN CURRENT, IUV (mA)
VHn = 0.55V
SEL = VCC
UV VOLTAGE (V)
4
3
2
1
0
0
1
3
4
2
SUPPLY VOLTAGE, VCC (V)
5
1.0
VHn = 0.45V
SEL = VCC
4
0.8
UV AT 150mV
UV/OV, VOL (V)
5
UV/OV Voltage Output Low vs
Output Sink Current
UV, ISINK vs VCC
3
2
UV AT 50mV
1
0
1
0
3
4
2
SUPPLY VOLTAGE, VCC (V)
5
–40°C
0.4
0
0
5
10
15
20
IUV/OV (mA)
2913 G08
Reset Timeout Period vs
Temperature
25
30
2913 G09
Reset Timeout Period vs
Capacitance
10000
CTMR = 1nF
UV/OV TIMEOUT PERIOD, tUOTO (ms)
UV/OV TIMEOUT PERIOD, tUOTO (ms)
0.6
0.2
2913 G07
12
25°C
125°C
11
1000
10
9
8
7
6
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
2913 G10
100
10
1
0.1
1
10
100
TMR PIN CAPACITANCE, CTMR (nF)
1000
2913 G11
PIN FUNCTIONS
DIS (Pin 8, LTC2913-2): Output Disable Input. Disables
the OV and UV output pins. When DIS is pulled high, the
OV and UV pins are not asserted except during a UVLO
condition. DIS has a weak (2µA) internal pull-down to
GND. Leave DIS open if unused.
Exposed Pad (Pin 11, DFN Package): Exposed Pad may
be left open or connected to device ground.
GND (Pin 5): Device Ground.
LATCH (Pin 8, LTC2913-1): OV Latch Clear/Bypass Input.
When pin is pulled low, OV is latched when asserted. When
pulled high, OV latch is cleared. While held high, OV has
the same delay and output characteristics as UV.
OV (Pin 6): Overvoltage Logic Output. Asserts low when
either VL input voltage is above threshold. Latched low
(LTC2913-1). Held low for programmed delay time after
both VL inputs are valid (LTC2913-2). OV has a weak pullup to VCC and may be pulled above VCC using an external
pull-up. Leave OV open if unused.
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LTC2913
PIN FUNCTIONS
TMR (Pin 9): Reset Delay Timer. Attach an external capacitor (CTMR) of at least 10pF to GND to set a reset delay time
of 9ms/nF. A 1nF capacitor will generate an 8.5ms reset
delay time. Tie TMR to VCC to bypass timer.
UV (Pin 7): Undervoltage Logic Output. Asserts low when
either VH input voltage is below threshold. Held low for a
programmed delay time after both VH inputs are valid. UV
has a weak pull-up to VCC and may be pulled above VCC
using an external pull-up. Leave UV open if unused.
VCC (Pin 10): Supply Voltage. Bypass this pin to GND with
a 0.1µF (or greater) capacitor. Operates as a direct supply
input for voltages up to 6V. Operates as a shunt regulator for
supply voltages greater than 6V and must have a resistance
between the pin and the supply to limit input current to no
greater than 10mA. When used without a current-limiting
resistance, VCC voltage must not exceed 6V.
VH1/VH2 (Pin 1/Pin 3): Voltage High Inputs 1 and 2. When
the voltage on this pin is below 0.5V, an undervoltage
condition is triggered. Tie pin to VCC if unused.
VL1/VL2 (Pin 2/Pin 4): Voltage Low Inputs 1 and 2. When
the voltage on this pin is above 0.5V, an overvoltage condition is triggered. Tie pin to GND if unused.
BLOCK DIAGRAM
10
9
VCC
TMR
VCC
400k
OSCILLATOR
1
2
3
4
VH1
VL1
VH2
VL2
–
+
–
+
–
+
UV
UV PULSE
GENERATOR
DISABLE
7
VCC
UVLO
+
–
2V
400k
VCC
OV PULSE
GENERATOR
DISABLE
UVLO
–
+
OV
6
0.5V
5
OV LATCH
CLEAR/BYPASS
GND
LTC2913-1
+
–
LATCH
8
1V
1V
DIS
8
+
–
2µA
LTC2913-2
2913 BD
2913fa
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LTC2913
APPLICATIONS INFORMATION
Voltage Monitoring
2. Choose RB to obtain the desired UV trip point
The LTC2913 is a low power dual voltage monitoring
circuit with two undervoltage and two overvoltage inputs.
A timeout period that holds OV and UV asserted after all
faults have cleared is adjustable using an external capacitor
and is externally disabled.
Once RA is known, RB is chosen to set the desired trip
point for the undervoltage monitor.
Each voltage monitor has two inputs (VHn and VLn) for
detecting undervoltage and overvoltage conditions. When
configured to monitor a positive voltage Vn using the
3-resistor circuit configuration shown in Figure 1, VHn
is connected to the high side tap of the resistive divider
and VLn is connected to the low side tap of the resistive
divider.
3. Choose RC to complete the design
3-Step Design Procedure
The following 3-step design procedure determines appropriate resistances to obtain the desired UV and OV trip
points for the voltage monitor circuit in Figure 1.
For supply monitoring, Vn is the desired nominal operating voltage, In is the desired nominal current through the
resistive divider, VOV is the desired overvoltage trip point
and VUV is the desired undervoltage trip point.
1. Choose RA to obtain the desired OV trip point
RA is chosen to set the desired trip point for the
overvoltage monitor.
V
R A = 0.5V • n
In
VOV
(1)
LTC2913
VHn
–
+
+
–
RB
VLn
UVn
0.5V
Once, RA and RB are known, RC is determined by:
RC =
Vn
– RA – RB
In
(3)
If any of the variables Vn, In, VUV or VOV change, then each
step must be recalculated.
Voltage Monitor Example
A typical voltage monitor application is shown in Figure 2.
The monitored voltage is a 5V ±10% supply. Nominal current in the resistive divider is 10µA.
1. Find RA to set the OV trip point of the monitor.
RA = 0.5V • 5V ≈ 45.3k
10µ A 5.5V
2. Find RB to set the UV trip point of the monitor.
RB = 0.5V • 5V – 45.3k ≅ 10.2k
10µ A 4.5V
3. Determine RC to complete the design.
V1
5V ±10%
RC
442k
–
+
(2)
RC = 5V – 45.3k − 10.2k ≈ 442k
10µ A
Vn
RC
V
RB = 0.5V • n – RA
In
VUV
OVn
RB
10.2k
RA
45.3k
RA
2913 F01
Figure 1. 3-Resistor Positive UV/OV Monitoring Configuration
VCC
5V
VCC
OV
VH1
LTC2913
VL1
UV
GND
2913 F02
Figure 2. Typical Supply Monitor
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LTC2913
APPLICATIONS INFORMATION
Power-Up/Power-Down
As soon as VCC reaches 1V during power-up, the UV output
asserts low and the OV output weakly pulls to VCC.
The LTC2913 is guaranteed to assert UV low and OV high
under conditions of low VCC, down to VCC = 1V. Above
VCC = 2V (2.1V maximum), the VH and VL inputs take
control.
Once both VH inputs and VCC are valid, an internal timer
is started. After an adjustable delay time, UV weakly pulls
high.
The two extreme conditions, with a relative accuracy of
1.5% and resistance accuracy of 1%, result in:

RC • 0.99 
VUV(MIN) = 0.5V • 0.985 •  1+

 (RA + RB ) • 1.01
and

RC • 1.01 
VUV(MAX ) = 0.5V • 1.015 •  1+

 (RA + RB ) • 0.99 
Threshold Accuracy
For a desired trip point of 4.55V,
Reset threshold accuracy is important in a supply-sensitive
system. Ideally, such a system resets only if supply voltages
fall outside the exact thresholds for a specified margin.
All LTC2913 inputs have a relative threshold accuracy of
±1.5% over the full operating temperature range.
Therefore,
For example, when the LTC2913 is programmed to monitor a 5V input with a 10% tolerance, the desired UV trip
point is 4.5V. Because of the ±1.5% relative accuracy of
the LTC2913, the UV trip point is between 4.433V and
4.567V which is 4.5V ±1.5%.
Likewise, the accuracy of the resistances chosen for RA,
RB and RC can affect the UV and OV trip points as well.
Using the example just given, if the resistances used to
set the UV trip point have 1% accuracy, the UV trip range
is between 4.354V and 4.650V. This is illustrated in the
following calculations.
The UV trip point is given as:

RC 
VUV = 0.5V  1+
 RA + RB 
RC
=8
RA + RB
VUV(MIN) = 0.5V • 0.985 •  1+ 8 0.99  = 4.354V

1.01
and
VUV(MAX ) = 0.5V • 1.015 •  1+ 8 1.01 = 4.6500 V

0.99 
Glitch Immunity
In any supervisory application, noise riding on the monitored DC voltage causes spurious resets. To solve this
problem without adding hysteresis, which causes a new
error term in the trip voltage, the LTC2913 lowpass filters
the output of the first stage comparator at each input. This
filter integrates the output of the comparator before asserting the UV or OV logic. A transient at the input of the
comparator of sufficient magnitude and duration triggers
the output logic. The Typical Performance Characteristics
show a graph of the Transient Duration vs. Comparator
Overdrive.
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LTC2913
APPLICATIONS INFORMATION
UV/OV Timing
Shunt Regulator
The LTC2913 has an adjustable timeout period (tUOTO) that
holds OV or UV asserted after all faults have cleared. This
assures a minimum reset pulse width allowing a settling
time delay for the monitored voltage after it has entered
the valid region of operation.
The LTC2913 has an internal shunt regulator. The VCC pin
operates as a direct supply input for voltages up to 6V.
Under this condition, the quiescent current of the device
remains below a maximum of 80µA. For VCC voltages
higher than 6V, the device operates as a shunt regulator
and must have a resistance RZ between the supply and the
VCC pin to limit the current to no greater than 10mA.
When any VH input drops below its designed threshold,
the UV pin asserts low. When all inputs recover above
their designed thresholds, the UV output timer starts. If
all inputs remain above their designed thresholds when
the timer finishes, the UV pin weakly pulls high. However,
if any input falls below its designed threshold during this
timeout period, the timer resets and restarts when all inputs
are above the designed thresholds. The OV output behaves
as the UV output when LATCH is high (LTC2913-1).
Selecting the UV/OV Timing Capacitor
The UV and OV timeout period (tUOTO) for the LTC2913
is adjustable to accommodate a variety of applications.
Connecting a capacitor, CTMR, between the TMR pin and
ground sets the timeout period. The value of capacitor
needed for a particular timeout period is:
CTMR = tUOTO • 115 • 10–9 [F/s]
The Reset Timeout Period vs Capacitance graph found in
the Typical Performance Characteristics shows the desired
delay time as a function of the value of the timer capacitor
that must be used. The TMR pin must have a minimum
10pF load or be tied to VCC. For long timeout periods, the
only limitation is the availability of a large value capacitor
with low leakage. Capacitor leakage current must not exceed
the minimum TMR charging current of 1.3µA. Tying the
TMR pin to VCC will bypass the timeout period.
Undervoltage Lockout
When VCC falls below 2V, the LTC2913 asserts an
undervoltage lockout (UVLO) condition. During UVLO,
UV is asserted and pulled low while OV is cleared and
blocked from asserting. When VCC rises above 2V, UV
follows the same timing procedure as an undervoltage
condition on any input.
When choosing this resistance value, select an appropriate
location on the I-V curve shown in the Typical Performance
Characteristics to accommodate any variations in VCC due
to changes in current through RZ.
UV and OV Output Characteristics
The DC characteristics of the UV and 0V pull-down strength
are shown in the Typical Performance Characteristics. Each
pin has a weak internal pull-up to VCC and a strong pulldown to ground. This arrangement allows these pins to
have open-drain behavior while possessing several other
beneficial characteristics. The weak pull-up eliminates the
need for an external pull-up resistor when the rise time on
the pin is not critical. On the other hand, the open-drain
configuration allows for wired-OR connections, and is
useful when more than one signal needs to pull down
on the output. VCC of 1V guarantees a maximum VOL =
0.15V at UV.
At VCC = 1V, the weak pull-up current on OV is barely turned
on. Therefore, an external pull-up resistor of no more than
100k is recommended on the OV pin if the state and pull-up
strength of the OV pin is crucial at very low VCC.
Note however, by adding an external pull-up resistor, the
pull-up strength on the OV pin is increased. Therefore, if
it is connected in a wired-OR connection, the pull-down
strength of any single device must accommodate this
additional pull-up strength.
Output Rise and Fall Time Estimation
The UV and 0V outputs have strong pull-down capability. The following formula estimates the output fall time
(90% to 10%) for a particular external load capacitance
(CLOAD):
tFALL ≈ 2.2 • RPD • CLOAD
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LTC2913
APPLICATIONS INFORMATION
where RPD is the on-resistance of the internal pull-down
transistor, typically 50Ω at VCC > 1V and at room temperature (25°C). CLOAD is the external load capacitance
on the pin. Assuming a 150pF load capacitance, the fall
time is 16.5ns.
The rise time on the UV and OV pins is limited by a 400k
pull-up resistance to VCC. A similar formula estimates the
output rise time (10% to 90%) at the UV and OV pins:
tRISE ≈ 2.2 • RPU • CLOAD
where RPU is the pull-up resistance.
OV Latch (LTC2913-1)
With the LATCH pin held low, the OV pin latches low when
an OV condition is detected. The latch is cleared by raising
the LATCH pin high. If an OV condition clears while LATCH
is held high, the latch is bypassed and the OV pin behaves
the same as the UV pin with a similar timeout period at the
output. If LATCH is pulled low while the timeout period is
active, the OV pin latches as before.
Disable (LTC2913-2)
The LTC2913-2 allows disabling the UV and OV outputs
via the DIS pin. Pulling DIS high will force both outputs
to remain weakly pulled high, regardless of any faults
that occur on the inputs. However, if a UVLO condition
occurs, UV asserts and pulls low, but the timeout function
is bypassed. UV pulls high as soon as the UVLO condition
is cleared.
DIS has a weak 2µA (typical) internal pull-down current
guaranteeing normal operation with the pin left open.
TYPICAL APPLICATIONS
Dual UV/OV Supply Monitor, 10% Tolerance, 5V, 3.3V
5V
POWER
3.3V
SUPPLIES
Supply Monitor Powered from 12V, 10% Tolerance, 12V, 5V
12V
POWER
SUPPLIES 5V
CBYP
0.1 F
RZ
10k
CBYP
0.1 F
10
RC1
44.2k
1
RB1
1k
RC2
27.4k 2
RA1
4.53k
RB2
1k
3
RA2
4.53k
4
VCC
SYSTEM
VH1
LTC2913-1
VL1
OV
VH2
UV
VL2
GND
5
LATCH
TMR
9
6
RB1
1k
7
10
RC1
115k
1
RC2
44.2k 2
3
8
RA1
4.53k
2913 TA02
CTMR
22nF TIMEOUT = 200ms
RB2
1k
RA2
4.53k
4
VCC
VH1
TMR
LTC2913-2
VL1
OV
VH2
UV
VL2
DIS
SYSTEM
9
6
7
8
GND
5
2913 TA03
2913fa
10
LTC2913
PACKAGE DESCRIPTION
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699)
R = 0.115
TYP
6
0.38 ± 0.10
10
0.675 ±0.05
3.50 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
3.00 ±0.10
(4 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
0.75 ±0.05
0.200 REF
0.50
BSC
2.38 ±0.05
(2 SIDES)
5
0.00 – 0.05
1
(DD10) DFN 1103
0.25 ± 0.05
0.50 BSC
2.38 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.50
0.305 ± 0.038
(.0197)
(.0120 ± .0015)
BSC
TYP
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
10 9 8 7 6
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0.497 ± 0.076
(.0196 ± .003)
REF
0° – 6° TYP
GAUGE PLANE
1 2 3 4 5
0.53 ± 0.152
(.021 ± .006)
DETAIL “A”
0.18
(.007)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.86
(.034)
REF
1.10
(.043)
MAX
0.17 – 0.27
(.007 – .011)
TYP
0.50
(.0197)
BSC
0.127 ± 0.076
(.005 ± .003)
MSOP (MS) 0603
2913fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LTC2913
TYPICAL APPLICATION
Dual UV/OV Supply Monitor with LED Undervoltage and Overvoltage Indicator and Manual
Undervoltage Reset Button, 10% Tolerance, 12V, 5V
12V
POWER
5V
SUPPLIES
0.1 F
44.2k
2.05M
1k
510
510
LED
LED
VCC
VH1
LTC2913-2
SYSTEM
VL1
OV
VH2
UV
4.53k
100k
10k
VL2
GND
DIS
TMR
2913 TA05
22nF
TIMEOUT = 200ms
MANUAL
RESET BUTTON
(NORMALLY OPEN)
RELATED PARTS
PART NUMBER
LTC1326/
LTC1326-2.5
LTC1726-2.5/
LTC1726-5
LTC1727-2.5/
LTC1727-5
LTC1728-1.8/
LTC1728-3.3
LTC1728-2.5/
LTC1728-5
LTC1985-1.8
LTC2900
LTC2901
LTC2902
LTC2903
LTC2904
LTC2905
LTC2906
LTC2907
LTC2908
LTC2909
LTC2910
LTC2914
DESCRIPTION
COMMENTS
Micropower Precision Triple Supply Monitor for 5V/2.5V,
4.725V, 3.118V, 1V Threshold (±0.75%)
3.3V and ADJ
Micropower Triple Supply Monitor for 2.5V/5V, 3.3V and ADJ Adjustable RESET and Watchdog Time-Outs
Micropower Triple Supply Monitor with Open-Drain Reset
Individual Monitor Outputs in MSOP
Micropower Triple Supply Monitor with Open-Drain Reset
5-Lead SOT-23 Package
Micropower Triple Supply Monitor with Open-Drain Reset
5-Lead SOT-23 Package
Micropower Triple Supply Monitor with Open-Drain Reset
Programmable Quad Supply Monitor
5-Lead SOT-23 Package
Adjustable RESET, 10-Lead MSOP and 3mm × 3mm
10-Lead DFN Package
Programmable Quad Supply Monitor
Adjustable RESET and Watchdog Timer, 16-Lead SSOP Package
Programmable Quad Supply Monitor
Adjustable RESET and Tolerance, 16-Lead SSOP Package,
Margining Functions
Precision Quad Supply Monitor
6-Lead SOT-23 Package, Ultralow Voltage Reset
3-State Programmable Precision Dual Supply Monitor
Adjustable Tolerance, 8-Lead SOT-23 Package
3-State Programmable Precision Dual Supply Monitor
Adjustable RESET and Tolerance, 8-Lead SOT-23 Package
Precision Dual Supply Monitor 1-Selectable and 1 Adjustable Separate VCC Pin, RST/RST Outputs
Precision Dual Supply Monitor 1-Selectable and 1 Adjustable Separate VCC, Adjustable Reset Timer
Precision Six Supply Monitor (Four Fixed & 2 Adjustable)
8-Lead SOT-23 and DFN Packages
Prevision Dual Input UV, OV and Negative Voltage Monitor
Separate VCC Pin, Adjustable Reset Timer, 8-Lead TSOT-23 and
DFN Packages
Octal Positive/Negative Voltage Monitor
Separate VCC Pin, Eight Inputs, Up to Two Negative Monitors
Adjustable Reset Timer, 16-Lead SSOP and DFN Packages
Quad UV/OV Positive/Negative Voltage Monitor
Separate VCC Pin, Four inputs, Up To Two Negative Monitors,
Adjustable Reset Timer, 16-Lead SSOP and DFN Packages
2913fa
12 Linear Technology Corporation
LT 1206 • REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2006
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