100V Micropower Voltage Monitor

100V Micropower Voltage Monitor
Configure High Voltage Designs for 1.4% Accuracy
The LTC®2965 (single) and LTC2966 (dual) high voltage monitors feature a wide operating range, low power consumption
and configurable input/outputs. Each device includes resistor-programmable threshold inputs to facilitate simple undervoltage,
overvoltage or window monitoring of positive or negative rails to within ±1.4% accuracy over temperature. Integrated high value
resistive dividers with selectable gain offer improved accuracy and flexibility compared to solutions using external high value
resistors.
Features
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Wide Operating Range: 3.5V to 100V
Quiescent Current: 7µA Typical
Adjustable Threshold Range
Internal High Value Resistive Dividers
1.4% Accuracy Over Temperature
Adjustable Output Polarity
High Voltage Rated Outputs
Adjustable or Built-In Hysteresis
Guaranteed Operation to 125°C
Product Selection
Part Number
Number of
Channels
1
3mm × 3mm DFN-8,
MSOP-16
LTC2966
2
3mm × 3mm QFN-16,
SO-20
LTC2965
L, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Packages
Application Examples
5V
–48V SUPPLY MONITOR
RISING THRESHOLD
–40.2
FALLING THRESHOLD –36.2
HYSTERESIS
–4.0
GAIN
40x
Single –48V UV Monitor
In this circuit, the LTC2965’s inverting-configured
output forces a UV pin to pull to 5V when the –48V
input supply drops below –36V. The 100V OUT
pin allows the LTC2965 to drive an opto-coupler to
translate the undervoltage signal to the 5V system.
100k
UV
5V
SYS
4.2mA
AT –48V
RTN
1k
VIN
RS
REF
140k
1000pF
10V
INH
LTC2965
10k
OUT
10k
INL
90.9k
PS
GND
–48V
48V OV/UV MONITOR
CHANNEL
RISING THRESHOLD
FALLING THRESHOLD
HYSTERESIS
GAIN
48V UV and OV Monitor
In this circuit, the LTC2966 provides window detection,
where Channel A monitors for a 36V UV condition and
Channel B monitors for a 72V OV condition. If either
threshold is exceeded, the system’s UV or OV output
pulls to 5V. Connecting INHA and INLB to ground
enables internal hysteresis for each channel in the
appropriate direction and reduces the number of
external components.
A
36.5
36.1
0.4
20x
48V
VINA
VINB
REF
1000pF
10V
RS1A
RS2A
RS1B
RS2B
INHA
294k
LTC2966
887k
100k
100k
UV
OV
PSA
GND
5V
SYS
OUTB
PSB
12V AUTOMOTIVE BATTERY
UV/OV INDICATOR
CHANNEL
A
RISING THRESHOLD
9.2
FALLING THRESHOLD
9.0
HYSTERESIS
0.2
GAIN
10x
12V Battery UV and OV Monitor
5V
OUTA
INLA
INHB
INLB
In this circuit, the LTC2966 provides window detection
for a vehicle battery, where the detection window is
configured to be ±25% of the nominal 12V battery
voltage. Channel A monitors for an OV condition and
Channel B monitors for a UV condition. By connecting
the LTC2966’s outputs together, FAULT is pulled low
if either threshold is exceeded. The LTC2966 also
tolerates load dump voltage transients >72V without
additional components.
B
72.1
71.3
0.8
40x
B
15.0
14.8
0.2
10x
12V
VEHICLE
BATTERY
1000pF
10V
VINA
REF
453k
300k
INHA
INLA
453k
INLB
INHB
VINB
RS1A
RS2A
RS1B
RS2B
LTC2966
GND
OUTA
PSA
OUTB
PSB
5V
100k
FAULT
5V
SYS
www.linear.com/2965 n 1-800-4-LINEAR
0115
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