Data Sheet
LOW POWER LOW OFFSET VOLTAGE SINGLE COMPARATOR
General Description
The AS331 consists of a single precision voltage com-
parator with a typical input offset voltage of 1.0mV
and high voltage gain. It is specifically designed to
operate from a single power supply over wide range of
voltages. Operation from split power supply is also
possible and the low power supply current drain is
independent of the magnitude of the power supply
voltage.
The AS331 is available in standard SOT-23-5 package.
·
·
·
AS331
Features
·
Wide Supply Voltage Range
- Single Supply: 2V to 36V
- Dual Supplies:
±1V
to
±18V
Low Supply Current at V
CC
=5V: 0.4mA
Low Input Bias Current: 25nA (Typical)
Low Input Offset Current:5nA (Typical)
Low Input Offset Voltage: 1mV (Typical)
Input Common Mode Voltage Range Includes
Ground
Differential Input Voltage Range Equals to the
Power Supply Voltage
Low Output Saturation Voltage at 4mA: 200mV
(Typical)
Open Collector Output
·
·
·
·
·
Applications
·
·
·
·
·
·
Battery Charger
Cordless Telephone
Switching Power Supply
DC-DC Module
PC Motherboard
Communication Equipment
SOT-23-5
Figure 1. Package Type of AS331
Oct 2009 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER LOW OFFSET VOLTAGE SINGLE COMPARATOR
Pin Configuration
K Package
(SOT-23-5)
AS331
INPUT-
GND
INPUT+
1
2
3
5
VCC
4
OUTPUT
Figure 2. Pin Configuration of AS331 (Top View)
Functional Block Diagram
VCC
5
INPUT+
INPUT-
3
1
Q2
Q1
Q3
Q4
4
Q8
Q7
OUTPUT
Q5
GND
Q6
2
Figure 3. Functional Block Diagram of AS331
Oct 2009 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER LOW OFFSET VOLTAGE SINGLE COMPARATOR
Ordering Information
AS331
Circuit Type
Package
K: SOT-23-5
Package
SOT-23-5
Temperature
Range
-40 to 85
o
C
Part Number
Lead Free
AS331KTR-E1
Green
AS331KTR-G1
AS331
-
E1: Lead Free
G1: Green
TR: Tape and Reel
Marking ID
Lead Free
EEA
Green
GEA
Packing
Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green package.
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage
Differential Input Voltage
Input Voltage
Input Current (V
IN
<-0.3V) (Note 2)
Output Short-circuit Current to Ground
Power Dissipation (T
A
=25
o
C)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10sec)
P
D
T
J
T
STG
T
LEAD
Symbol
V
CC
V
ID
V
IN
I
IN
Value
40
40
-0.3 to 40
50
Continuous
620
150
-65 to 150
260
mW
o
o
Unit
V
V
V
mA
C
C
o
C
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Max-
imum Ratings" for extended periods may affect device reliability.
Note 2: This input current will only exist when the voltage at any of the input leads is driven negative. It is due to
the collector-base junction of the input PNP transistors becoming forward biased and thereby acting as input diode
clamps. In addition to this diode action, there is also lateral NPN parasitic transistor action on the IC chip. This
transistor action can cause the output voltages of the comparators to go to the V+ voltage level (or to ground for a
large overdrive) for the time duration that an input is driven negative. This is not destructive and normal output
states will re-establish when the input voltage, which was negative, again returns to a value greater than -0.3V (at
25
o
C).
Oct 2009 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER LOW OFFSET VOLTAGE SINGLE COMPARATOR
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
AS331
Supply Voltage
Operating Ambient Temperature Range
V
CC
T
A
2
-40
36
85
V
o
C
Electrical Characteristics
V
CC
=5V, GND=0V, T
A
=25
o
C, unless otherwise specified.
Bold
typeface applies over T
A
=-40 to 85
o
C (Note 3)
Parameter
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Common Mode
Voltage Range (Note 4)
Symbol
V
OS
I
B
I
IO
Conditions
V
OUT
=1.4V, V
CC
=5 to 30V
I
IN
+ or I
IN
- with output in linear range,
V
CM
=0V
I
IN
+-I
IN
-, V
CM
=0V
V
CC
=30V
V
CC
=5V
Supply Current
I
CC
R
L=
∞
V
CC
=30V
50
0
0.4
0.5
200
200
1.3
6.0
16
0.1
1
200
400
500
Min
Typ
1
25
5
Max
5
7.0
250
400
50
200
V
CC
-1.5
1.0
2.0
1.7
3.0
Voltage Gain
Large Signal Response
Time
Response Time
Output Sink Current
Output Leakage Current
Saturation Voltage
I
SINK
I
LEAK
V
SAT
G
V
V
CC
=15V, R
L
≥15kΩ,
V
OUT
=1 to 11V
V
IN
=TTL Logic Swing, R
L
=5.1kΩ
R
L
=5.1kΩ
V
IN
-=1V, V
IN
+=0V, V
OUT
=1.5V
V
IN
-=0V, V
IN
+=1V, V
OUT
=5V
V
IN
-=0V, V
IN
+=1V, V
OUT
=30V
V
IN
-=1V, V
IN
+=0V, I
SINK
≤4mA
V/mV
ns
µs
mA
nA
µA
mV
mA
Unit
mV
nA
nA
V
Note 3: These specifications are limited to -40
o
C
≤T
A
≤85
o
C. Limits over temperature are guaranteed by design, but
not tested in production.
Note 4: The input common mode voltage of either input signal voltage should not be allowed to go negatively by
more than 0.3V (at 25
o
C
). The upper end of the common mode voltage range is V
CC
-1.5V (at 25
o
C
), but either or
both inputs can go to +36V without damages, independent of the magnitude of the V
CC
.
Oct 2009 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER LOW OFFSET VOLTAGE SINGLE COMPARATOR
Typical Performance Characteristics
AS331
0.60
0.6
0.55
V
CC
=5V
0.5
V
CC
=30V
Supply Current (mA)
0.50
0.45
0.40
0.35
0.30
0.25
0.20
-40
Supply Current (mA)
0.4
0.3
0.2
o
o
T
C
=-40 C
0.1
o
T
C
=25 C
T
C
=85 C
0.0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
-20
0
20
40
60
o
80
100
120
Supply Voltage (V)
Case Temperature ( C)
Figure 4. Supply Current vs. Supply Voltage
Figure 5. Supply Current vs. Case Temperature
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
-40
-20
0
20
40
60
o
R
L
=5.1K
Ω
V
CC
=5V
350
V
CC
=5V
Saturation Voltage (mV)
300
Input Offset Voltage (mV)
V
CC
=30V
I
SINK
=4mA
250
200
150
80
100
120
100
-40
-20
0
20
40
60
o
80
100
120
Case Temperature ( C)
Case Temperature ( C)
Figure 6. Input Offset Voltage vs. Case Temperature
Figure 7. Saturation Voltage vs. Case Temperature
Oct 2009 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
