LTC2966
100V Micropower Dual
Voltage Monitor
FEATURES
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DESCRIPTION
The
LTC
®
2966
is a low current, high voltage dual channel
voltage monitor. Internal high value resistors sense the
input monitor pins providing a compact and low power
solution for voltage monitoring. Each channel includes
two comparator reference inputs (INH/INL) to allow con-
figuration of a high and low threshold using an external
resistive divider biased from the on-chip reference. Range
selection pins are provided for each channel to set the
internal resistive dividers for 5x, 10x, 20x and 40x scaling.
The thresholds are scaled according to the range selection
settings. Additionally, either INH or INL can be grounded
to enable built-in hysteresis. Polarity selection pins allow
each output to be inverted. The outputs are 100V capable
and include a 500k pull-up resistor to an internal supply.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
Wide Operating Range: 3.5V to 100V
Wide Monitoring Range: 1.75V to 98V
Quiescent Current: 7µA
Adjustable Threshold Range
Internal High Value Resistive Dividers
±1.4% (Max) Threshold Accuracy Over Temperature
Polarity Selection
100V Rated Outputs
Selectable Built-In Hysteresis
20-Lead SW and 16-Lead 3mm × 3mm QFN
Packages
APPLICATIONS
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Portable Equipment
Battery-Powered Equipment
Telecom Systems
Automotive/Industrial Electronics
TYPICAL APPLICATION
Dual Undervoltage Monitor
48V
24V
V
INA
V
INB
5V
REF
200k
THRESHOLD
CONFIGURATION
INHA
91k
INLA
909k
INHB
INLB
PSA RS1A RS2A PSB RS1B RS2B GND
OUTB
LTC2966
24V UNDERVOLTAGE
OUTA
RANGE
V
IN
MONITOR RANGE SELECTION
1.75V* to 12.25V
3.5V to 24.5V
100k
48V UNDERVOLTAGE
5V
SYS
100k
5x
10x
20x
40x
7V to 49V
14V to 98V
*Requires either V
INA
or V
INB
> 3.5V
Supply Current vs V
INA(B)
12
10
8
I
VA(B)
(µA)
POLARITY AND RANGE SELECTION
CHANNEL
A
B
40.03V 20.0V
36.4V 18.2V
3.6V
1.8V
20x
10x
6
4
2
RANGE = 40x
OUTA(B) = LOW
V
INB(A)
= GND
I
REF
= 0µA
0
20
40
60
V
INA
(V)
80
–45°C
25°C
90°C
125°C
100
2966 TA01b
RISING THRESHOLD
FALLING THRESHOLD
HYSTERESIS
RANGE
2966 TA01a
0
2966fc
For more information
www.linear.com/LTC2966
1
LTC2966
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Input Voltages
V
INA
, V
INB
............................................ –0.3V to 140V
PSA, PSB, RS1A, RS1B, RS2A, RS2B ...... –0.3V to 6V
INHA, INHB, INLA, INLB .......................... –0.3V to 6V
Output Voltages
OUTA, OUTB ........................................ –0.3V to 140V
Average Currents
V
INA
, V
INB
........................................................–20mA
OUTA, OUTB ......................................................±5mA
REF ....................................................................±5mA
INHA, INHB, INLA, INLB ....................................–1mA
Operating Ambient Temperature Range
LTC2966C ................................................ 0°C to 70°C
LTC2966I .............................................–40°C to 85°C
LTC2966H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
OUTA
OUTB
V
INA
V
INB
V
INA
1
NC 2
OUTA 3
12 GND
17
GND
11 INHB
10 INLB
9
5
RS2A
6
PSA
7
PSB
8
RS2B
RS1B
NC 4
REF 5
INHA 6
INLA 7
RS1A 8
RS2A 9
PSA 10
SW PACKAGE
20-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 35°C/W
20 V
INB
19 NC
18 OUTB
17 NC
16 GND
15 INHB
14 INLB
13 RS1B
12 RS2B
11 PSB
16 15 14 13
REF 1
INHA 2
INLA 3
RS1A 4
UD PACKAGE
16-LEAD (3mm
×
3mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 68°C/W
EXPOSED PAD (PIN 17) PCB GND CONNECTION OPTIONAL
ORDER INFORMATION
LEAD FREE FINISH
TUBE
LTC2966CUD#PBF
LTC2966IUD#PBF
LTC2966HUD#PBF
LTC2966CSW#PBF
LTC2966ISW#PBF
LTC2966HSW#PBF
TAPE AND REEL
LTC2966CUD#TRPBF
LTC2966IUD#TRPBF
LTC2966HUD#TRPBF
LTC2966CSW#TRPBF
LTC2966ISW#TRPBF
LTC2966HSW#TRPBF
http://www.linear.com/product/LTC2966#orderinfo
PART MARKING*
LGMG
LGMG
LGMG
LTC2966SW
LTC2966SW
LTC2966SW
PACKAGE DESCRIPTION
16-Lead (3mm × 3mm) Plastic QFN
16-Lead (3mm × 3mm) Plastic QFN
16-Lead (3mm × 3mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
20-Lead Plastic Small Outline (Wide .300 Inch) 0°C to 70°C
20-Lead Plastic Small Outline (Wide .300 Inch) –40°C to 85°C
20-Lead Plastic Small Outline (Wide .300 Inch) –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2966fc
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For more information
www.linear.com/LTC2966
LTC2966
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
INA
= V
INB
= 12V, RS1/RS2 = GND, PS = GND,
INH = 1.2V, INL = GND (Notes 1, 2).
SYMBOL
V
IN
V
MON
I
VA
I
VB
V
UVLO
PARAMETER
Input Supply Operating Range
V
IN
Monitor Range
V
INA
Input Supply Current
V
INB
Input Supply Current
CONDITIONS
V
INA
or V
INB
(Note 3)
V
INA
= 100V, V
INB
= GND, 40x
V
INA
= GND, V
INB
= 100V, 40x
V
INB
= 100V, V
INA
= GND, 40x
V
INB
= GND, V
INA
= 100V, 40x
V
INB
= 100V, V
INA
= 5V, 40x
V
INA
or V
INB
Rising
V
INA
and V
INB
Falling
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ELECTRICAL CHARACTERISTICS
MIN
3.5
1.75
3
3
TYP
7
7
2
70
Undervoltage Lockout
Undervoltage Lockout Hysteresis
Comparator Reference Input: INHA, INHB, INLA, INLB
Comparator Common Mode Voltage
V
CM
V
IN
Error Voltage at 96V
V
ERR
V
IN
Error Voltage at 48V
V
IN
Error Voltage at 24V
V
IN
Error Voltage at 12V
V
OS
AV
ERR
V
HYS
V
HYTH
t
PD
I
IN(LKG)
Comparator Offset Voltage
Internal Resistive Divider Range Error
Comparator Built-in Hysteresis
Built-in Hysteresis Enable Threshold
V
IN
to OUT Comparator Propagation Delay
Input Leakage Current (INH, INL)
MAX
100
98
15
±50
15
±50
4
3
UNITS
V
V
µA
nA
µA
nA
µA
V
mV
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
%
mV
mV
mV
µs
nA
nA
V
µV
RMS
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0.35
±250
±250
±100
±100
±35
±35
±15
±15
±1.9
14
–30
100
22
–22
40
±0.1
±0.1
2.378
2.402
140
INH = V
REF
, 40x
0.35V ≤ INH ≤ 2.4V, 40x
INH = V
REF
, 20x
0.35V ≤ INH ≤ 2.4V, 20x
INH = V
REF
, 10x
0.35V ≤ INH ≤ 2.4V, 10x
INH = V
REF
, 5x
0.35V ≤ INH ≤ 2.4V, 5x
INH = 0.35V, 10x
INH = 2.4V, Range = 5x, 10x, 20x, 40x
INH = GND, INL Rising
INL = GND, INH Falling
Overdrive = 10%, OUT Falling, 10x
INH = GND, INL = 1.2V
V = 1.2V, I-Grade
V = 1.2V, H-Grade
I
REF
≤ 100µA, V
IN
≥ 3.5V
100Hz to 100kHz
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2.45
±1360
±400
±630
±150
±315
±75
±155
±35
±3
±0.4
30
–14
175
80
±1
±10
2.426
Reference: REF
Reference Output Voltage
V
REF
Noise
Reference Output Noise
Control Inputs: RS1A, RS2A, RS1B, RS2B, PSA, PSB
Select Input Threshold
V
TH
Input Leakage Current
I
LKG
Status Outputs: OUTA, OUTB
Voltage Output Low
V
OL
V
OH
I
OH
I
O(LKG)
Voltage Output High
Output Current High
Leakage Current, Output High
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0.4
V = 2.4V
V
IN
= 1.25V, I = 10µA
V
IN
= 3.5V, I = 500µA
V
IN
= 3.5V, I = –1µA
V
IN
≥ 4.5V, I = –1µA
V = GND, V
IN
= 3.5V
V = 100V, V
IN
= 6V
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1.4
±100
100
400
2.75
4
–5
±250
V
nA
mV
mV
V
V
µA
nA
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2
2.5
–15
2.375
3
–7.5
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:
Requires either V
INA
or V
INB
>3.5V.
2966fc
For more information
www.linear.com/LTC2966
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LTC2966
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs V
INA(B)
12
10
8
I
VA(B)
(µA)
I
VB
(µA)
6
4
2
0
RANGE = 40x
OUTA(B) = LOW
V
INB(A)
= GND
I
REF
= 0µA
0
20
40
60
V
INA
(V)
80
–45°C
25°C
90°C
125°C
100
2966 G01
V
INB
Pin Current vs V
INB
2.5
RANGE = 40x
OUTA(B) = LOW
V
INA
= 5V
I
REF
= 0µA
V
REF
(V)
2.412
2.408
2.404
1.5
2.400
2.396
–45°C
25°C
90°C
125°C
0
20
60
40
V
INB
(V)
80
100
2966 G02
V
REF
vs Temperature
I = –10µA
2.0
1.0
0.5
2.392
2.388
–50 –25
0
0
25 50 75 100 125 150
TEMPERATURE (°C)
2966 G03
2.450
V
REF
vs Load Current
V
IN
= 3.5V
2.450
V
REF
vs V
INA(B)
25°C
RANGE ERROR, AV
ERR
(%)
0.4
% Range Error vs Temperature
2.425
V
REF
(V)
V
REF
(V)
2.425
0.2
2.400
2.400
0
2.375
2.350
–45°C
25°C
90°C
125°C
0
0.4
1.2
1.6
0.8
LOAD CURRENT (mA)
2.0
2966 G04
2.375
1µA
100µA
1mA
3.0
3.5
3.2
V
INA
(V)
3.7
4.0
2966 G05
–0.2
2.350
2.7
–0.4
–50 –25
5x
10x
20x
40x
0
25 50 75 100 125 150
TEMPERATURE (°C)
2966 G06
Comparator V
OS
vs Temperature
1500
1000
500
V
OS
(µV)
0
V
INH(L)
= 1.2V
PROPAGATION DELAY, t
PD
(µs)
V
IN
Falling Propagation Delay
vs % Overdrive
125
100
Built-In Hysteresis
vs Temperature
28
|BUILT-IN HYSTERESIS| V
HYS
(mV)
26
24
22
20
18
16
–50
V
INH(L)
= 1.2V
V
INL
= 1.2V
V
INH
= GND
V
IN
= 12V
75
50
–45°C
25°C
90°C
125°C
0.1
1
10
% OVERDRIVE (%)
100
2966 G08
–500
–1000
–1500
–50 –25
25
0
0
25 50 75 100 125 150
TEMPERATURE (°C)
2966 G07
0
50
100
TEMPERATURE (°C)
150
2966 G09
2966fc
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For more information
www.linear.com/LTC2966
LTC2966
TYPICAL PERFORMANCE CHARACTERISTICS
Voltage Output High vs Pull-Down
Current (OUTA/OUTB)
4
V
IN
= 12V
1.50
1.25
3
1.00
V
OH
(V)
2
V
OL
(V)
V
OH
(V)
0.75
0.50
1
–45°C
25°C
90°C
125°C
0
–6
–9
–3
PULL-DOWN CURRENT (µA)
–12
2966 G10
Voltage Output Low vs Pull-Up
Current (OUTA/OUTB)
V
IN
= 12V
3.5
3.2
2.9
2.6
2.3
–45°C
25°C
90°C
125°C
0
1
2
3
4
PULL-UP CURRENT (mA)
5
2966 G11
Voltage Output High
vs Input Voltage
I = –1µA
0.25
0
2.0
1.7
0
3
4
5
V
IN
(V)
6
7
8
2966 G12
PIN FUNCTIONS
Exposed Pad (UD16 Only):
Exposed pad may be left float-
ing or connected to device ground.
GND:
Device Ground.
INHA:
Channel A High Comparator Reference Input . Voltage
on this pin is multiplied by the configured range setting
to set the V
INA
high or rising threshold. Keep within valid
voltage range, V
CM
, or tie to GND to configure built-in
hysteresis where high threshold for V
INA
becomes INLA
+ V
HYS
scaled according to the RS pin configuration.
INHB:
Channel B High Comparator Reference Input . Voltage
on this pin is multiplied by the configured range setting
to set the V
INB
high or rising threshold. Keep within valid
voltage range, V
CM
, or tie to GND to configure built-in
hysteresis where high threshold for V
INB
becomes INLB
+ V
HYS
scaled according to the RS pin configuration.
INLA:
Channel A Low Comparator Reference Input. Voltage
on this pin is multiplied by the configured range setting
to set the V
INA
low or falling threshold. Keep within valid
voltage range, V
CM
, or tie to GND to configure built-in
hysteresis where low threshold becomes INHA – V
HYS
scaled according to the RS pin configuration. Otherwise,
INHA-INLA sets the hysteresis of the Channel A compara-
tor. Oscillation will occur if INLA > INHA unless built-in
hysteresis is enabled.
INLB:
Channel B Low Comparator Reference Input . Voltage
on this pin is multiplied by the configured range setting
to set the V
INB
low or falling threshold. Keep within valid
voltage range, V
CM
, or tie to GND to configure built-in
hysteresis where low threshold becomes INHB – V
HYS
scaled according to the RS pin configuration. Otherwise,
INHB-INLB sets the hysteresis of the Channel B compara-
tor. Oscillation will occur if INLB > INHB unless built-in
hysteresis is enabled.
OUTA:
Channel A Comparator Output. OUTA consists
of a high voltage active pull-down and a gated, resistive
(500kΩ) pull-up to an internally generated supply between
3.5V and 5V depending on input supply voltage. Blocking
circuitry at the pin allows the pin to be resistively pulled
up to voltages as high as 100V without back conducting
onto the internal supply of the part. Polarity with respect
to the V
INA
pin is configured using the polarity select pin,
PSA. OUTA pulls low when the part is in UVLO.
2966fc
For more information
www.linear.com/LTC2966
5
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