ST LM2901 User Manual
Low-power quad voltage comparator
Features
■ Wide single supply voltage range or dual
supplies for all devices: +2 V to +36 V or ±1 V
to ±18 V
■ Very low supply current (1.1 mA) independent
of supply voltage (1.4 mW/comparator at +5 V)
■ Low input bias current: 25 nA typ.
■ Low input offset current: ±5 nA typ.
■ Input common-mode voltage range includes
negative rail
■ Low output saturation voltage:
250 mV typ. (I
■ Differential input voltage range equal to the
supply voltage
■ TTL, DTL, ECL, MOS, CMOS compatible
outputs
= 4 mA)
O
LM2901
N
DIP14
(Plastic package)
D
SO-14
(Plastic micropackage)
P
TSSOP14
(Thin shrink small outline package)
Description
This device consists of four independent precision
voltage comparators, which are designed
specifically to operate from a single supply over a
wide range of voltages. Operation from split
power supplies is also possible.
These comparators also have a unique
characteristic in that the input common-mode
voltage range includes the negative rail even
though operated from a single power supply
voltage.
Q4
QFN16 3x3
(Plastic micropackage)
February 2012 Doc ID 2468 Rev 7 1/17
www.st.com
17
Pin connection and schematic diagram LM2901
1 Pin connection and schematic diagram
Figure 1. Pin connections (top view)
Output 2
Output 1
VCC+
Inverting input 1
Non-inverting input 1
Inverting input 2
Non-inverting input 2
1
2
3
4
5
6
7
14
Output 3
13
Output 4
12
VCC-
11
Non-inverting input 4
10
Inverting input 4
9
Non-inverting input 3
8
Inverting input 3
Figure 2. Schematic diagram
3.5μA
Non-inverting
input
2/17 Doc ID 2468 Rev 7
Inverting
input
V
CC
100 μA
3.5μA
100μA
V
O
V
CC
LM2901 Absolute maximum ratings and operating conditions
2 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
V
id
V
in
R
thja
R
thjc
T
j
T
stg
ESD
1. Short-circuits from the output to V
maximum output current is approximately 20 mA, independent of the magnitude of V
2. Short-circuits can cause excessive heating. Destructive dissipation can result from simultaneous shortcircuits on all amplifiers. All values are typical.
Supply voltage ±18 to 36 V
Differential input voltage ±36 V
Input voltage -0.3 to +36 V
Output short-circuit to ground
Thermal resistance junction to ambient
DIP14
SO-14
TSSOP14
QFN16 3x3
Thermal resistance junction to case
DIP14
SO-14
TSSOP14
QFN16 3x3
(1)
(2)
(2)
80
105
100
45
33
31
32
14
°C/W
Maximum junction temperature +150 °C
Storage temperature range -65 to +150 °C
HBM: human body model
MM: machine model
CDM: charged device model
CC
(3)
(4)
(5)
+
can cause excessive heating and eventual destruction. The
500 V
100 V
1500 V
+
.
CC
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
5. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
Table 2. Operating conditions
Symbol Parameter Value Unit
V
CC
T
V
icm
oper
Supply voltage
Common mode input voltage range
T
≤ T
amb
≤ T
max
min
Operating free-air temperature range -40 to +125 °C
2 to 32
±1 to ±16
0 to (V
0 to (V
CC
CC
+
+
-1.5)
-2)
V
V
Doc ID 2468 Rev 7 3/17
Electrical characteristics LM2901
3 Electrical characteristics
Table 3. Electrical characteristics at V
CC
+
= 5 V, V
-
= GND, T
CC
amb
= 25° C
(unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
V
I
io
I
ib
A
vd
Input offset voltage
io
T
≤ T
min
Input offset current
T
≤ T
min
Input bias current (I
T
≤ T
min
Large signal voltage gain
(VCC = 15 V, RL=15kΩ, Vo= 1 to 11 V)
amb
amb
amb
Supply current (all comparators)
I
CC
V
= +5 V, no load
CC
VCC = +30 V, no load
V
Differential input voltage
id
Low level output voltage
V
OL
Vid = -1V, I
T
≤ T
min
sink
amb
High level output current
I
I
sink
t
OH
res
(V
CC =Vo
T
Output sink current (Vid = -1 V,Vo = 1.5 V) 6 16 mA
Small signal response time
(RL = 5.1 kΩ connected to V
= 30 V, Vid = 1 V)
≤ T
min
amb
Large signal response time
TTL input (V
t
rel
+
)
V
CC
Output signal at 50% of final value
Output signal at 95% of final value
1. At output switch point, VO ≈ 1.4 V, RS = 0 with V
mode range (0 V to V
2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially
constant, independent of the state of the output, so there is no loading charge on the reference of input
lines.
3. The response time specified is for a 100 mV input step with 5 mV overdrive.
4. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage
remains within the common-mode range, the comparator will provide a proper output state. The low input
voltage state must not be less than –0.3 V (or 0.3 V below the negative power supply, if used).
5. Maximum values are guaranteed by design.
CC
+
–1.5 V).
(1)
≤ T
max
≤ T
max
(2)
+
-
or I
)
I
I
≤ T
max
(3)
= 4 mA
≤ T
max
≤ T
max
(4)
CC
(5)
= +1.4 V, RL=5.1kΩ to
ref
17
15
550
150
25 250
400
25 200 V/mV
1.1
1.3
V
2
2.5
CC
250 400
700
0.1
1
+
)
+
from 5 V to 30 V, and over the full input common-
CC
1.3 µs
500
1
mV
nA
nA
mA
+
V
mV
nA
µA
ns
µs
4/17 Doc ID 2468 Rev 7
LM2901 Electrical characteristics
Figure 3. Supply current vs. supply voltage Figure 4. Input current vs. supply voltage
Figure 5. Output saturation voltage vs.
output current
Figure 6. Response time for various input
overdrives - negative transition
Figure 7. Response time for various input
overdrives - positive transition
Doc ID 2468 Rev 7 5/17
Typical application schematics LM2901
4 Typical application schematics
Figure 8. Basic comparator Figure 9. Driving CMOS
5 V
V
= 5 V
CC
100 kΩ
+V
-V
(ref)
(ref)
1/4
LM2901
15 kΩ
+V
(ref)
1/ 4
V
O
-V
(ref)
LM2901
Figure 10. Driving TTL Figure 11. Low frequency op-amp
5 V
+V
-V
(ref)
(ref)
1/ 4
LM2901
5 V
10 kΩ
1/4
LM2901
~
e
l
&
100 kΩ
&
1 kΩ
AV = 100
15 k
0.5 μF
&
Ω
e
o
Figure 12. Low frequency op-amp with boost Figure 13. Transducer amplifier
5 V
(eo = 0 V for el = 0 V)
15 kΩ
1/ 4
LM2901
e
~
l
1 kΩ
100 k
AV = 100
0.5 μF
Ω
2N 2222
e
o
6/17 Doc ID 2468 Rev 7
Magnetic pick-up
10 kΩ
10 kΩ
5 V
1/ 4
LM2901
20 MΩ
3 kΩ
e
o
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