LM2901
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
O
= 4 mA)
Differential input voltage range equal to the
supply voltage
TTL, DTL, ECL, MOS, CMOS compatible
outputs
■
■
■
■
■
■
■
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
1
Output 1
2
V
CC
+
Inverting input 1
Non-inverting input 1
Inverting input 2
Non-inverting input 2
3
4
5
6
7
14
O
u
tput
3
13
O
u
tput 4
12
11
10
9
8
V
C C
-
Non-inverting input
4
Inverting input 4
Non-inverting input
3
Inverting input
3
Figure 2.
Schematic diagram
V
CC
3.5
μ
A
100
μA
3.5
μ
A
100
μ
A
Non-inverting
input
V
O
Inverting
input
V
CC
2/17
Doc ID 2468 Rev 7
LM2901
Absolute maximum ratings and operating conditions
2
Absolute maximum ratings and operating conditions
Table 1.
Symbol
V
CC
V
id
V
in
Supply voltage
Differential input voltage
Input voltage
Output short-circuit to ground
(1)
Thermal resistance junction to ambient
(2)
R
thja
DIP14
SO-14
TSSOP14
QFN16 3x3
Thermal resistance junction to case
(2)
R
thjc
DIP14
SO-14
TSSOP14
QFN16 3x3
Maximum junction temperature
Storage temperature range
HBM: human body model
(3)
ESD
MM: machine model
(4)
CDM: charged device model
(5)
33
31
32
14
+150
-65 to +150
500
100
1500
°C
°C
V
V
V
80
105
100
45
°C/W
Absolute maximum ratings
Parameter
Value
±18 to 36
±36
-0.3 to +36
Unit
V
V
V
T
j
T
stg
1. Short-circuits from the output to V
CC+
can cause excessive heating and eventual destruction. The
maximum output current is approximately 20 mA, independent of the magnitude of V
CC+
.
2. Short-circuits can cause excessive heating. Destructive dissipation can result from simultaneous short-
circuits on all amplifiers. All values are typical.
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.
Symbol
V
CC
V
icm
T
oper
Operating conditions
Parameter
Supply voltage
Common mode input voltage range
T
min
≤
T
amb
≤
T
max
Operating free-air temperature range
Value
2 to 32
±1 to ±16
0 to (V
CC+
-1.5)
0 to (V
CC+
-2)
-40 to +125
Unit
V
V
°C
Doc ID 2468 Rev 7
3/17
Electrical characteristics
LM2901
3
Electrical characteristics
Table 3.
Symbol
V
io
I
io
I
ib
A
vd
Electrical characteristics at V
CC+
= 5 V, V
CC-
= GND, T
amb
= 25° C
(unless otherwise specified)
Parameter
Input offset voltage
(1)
T
min
≤
T
amb
≤
T
max
Input offset current
T
min
≤
T
amb
≤
T
max
Input bias current (I
I+
or I
I-
)
(2)
T
min
≤
T
amb
≤
T
max
Large signal voltage gain
(V
CC
= 15 V, R
L
= 15 kΩ V
o
= 1 to 11 V)
,
Supply current (all comparators)
V
CC
= +5 V, no load
V
CC
= +30 V, no load
Differential input voltage
(3)
Low level output voltage
V
id
= -1V, I
sink
= 4 mA
T
min
≤
T
amb
≤
T
max
High level output current
(V
CC
= V
o
= 30 V, V
id
= 1 V)
T
min
≤
T
amb
≤
T
max
Output sink current (V
id
= -1 V,V
o
= 1.5 V)
Small signal response time
(4)
(R
L
= 5.1 kΩ connected to V
CC+
)
Large signal response time
(5)
TTL input (V
ref
= +1.4 V, R
L
= 5.1 kΩ to
V
CC+
)
Output signal at 50% of final value
Output signal at 95% of final value
6
250
25
200
25
5
Min.
Typ.
1
Max.
7
15
50
150
250
400
Unit
mV
nA
nA
V/mV
I
CC
V
id
V
OL
1.1
1.3
2
2.5
V
CC+
400
700
mA
V
mV
I
OH
I
sink
t
res
0.1
1
16
1.3
nA
µA
mA
µs
t
rel
500
1
ns
µs
1.
At output switch point, V
O
≈
1.4 V, R
S
= 0 with V
CC+
from 5 V to 30 V, and over the full input common-
mode range (0 V to V
CC+
–1.5 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.
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
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