1
TC9491A
TC9491B
LOW POWER, BANDGAP VOLTAGE REFERENCES
FEATURES
s
s
s
s
s
s
s
Temperature Coefficient ......................... 50ppm/
°
C
Wide Operating Current Range ....... 15
µ
A to 20mA
Dynamic Impedance ......................................... 0.6
Ω
Output Tolerance ...................................... 1% or 2%
Output Voltage Option .................................. 1.220V
TO-92 Plastic Package
8-Pin Plastic Small Outline (SO) Package
2
GENERAL DESCRIPTION
The TC9491 (1.220V output) bipolar, two-terminal,
bandgap voltage references offer precision performance
without premium price. These devices do not require thin-
film resistors, greatly lowering manufacturing complexity
and cost.
A 50ppm/°C output temperature coefficient and a 15µA
to 20mA operating current range make these devices at-
tractive for multimeter, data acquisition converter, and tele-
communication voltage references.
3
APPLICATIONS
s
s
s
s
s
ADC and DAC Reference
Current Source Generation
Threshold Detectors
Power Supplies
Multi-meters
ORDERING INFORMATION
Part No.
TC9491ACOA
TC9491BCOA
TC9491ACZM
TC9491BCZM
Package
Range
8-Pin SOIC
8-Pin SOIC
TO-92
TO-92
Temperature
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Tempco.
50 ppm°C
100 ppm°C
50 ppm°C
100 ppm°C
4
PIN CONFIGURATIONS
TO-92 PLASTIC
(BOTTOM VIEW)
3
1
NC
NC
NC
SURFACE MOUNT
PLASTIC PACKAGE
1
2
3
8
7
6
5
CATHODE
NC
NC
NC
5
ANODE 4
6
TC9491ACZB
TC94191BCZB
TC9491ACOA
TC94191BOA
NC = NO INTERNAL CONNECTION
7
8
TC9491A/B-3 8/23/96
TELCOM SEMICONDUCTOR, INC.
3-15
LOW POWER, BANDGAP
VOLTAGE REFERENCES
TC9491A
TC9491B
ABSOLUTE MAXIMUM RATINGS*
Forward Current .................................................... +10mA
Reverse Current .................................................... +30mA
Storage Temperature Range ................ – 65°C to +150°C
Operating Temperature Range
TO-92 Package ..................................... 0°C to +70°C
COA Surface Mount Package ............... 0°C to +70°C
Lead Temperature (Soldering, 10 sec)
TO-92 Package .............................................. +300°C
COA Surface Mount Package ........................ +300°C
Power Dissipation
Limited by Forward/Reverse Current
*Functional operation above the absolute maximum stress ratings is not
implied.
RESPONSE TIME TEST CIRCUIT
36 kΩ
OUTPUT
INPUT
TC9491
ELECTRICAL CHARACTERISTICS:
T
A
= +25°C, unless otherwise specified.
Symbol
V
(BR)R
I
RMIN
Parameter
Reverse Breakdown Voltage
T
A
= 0°C to +70°C
Minimum Operating Current
T
A
= +25°C
T
A
= 0°C to +70°C
Reverse Breakdown Voltage
Change with Current
I
Rmin
= I
R
= 1.0mA, T
A
= +25°C
T
A
= 0°C to +70°C
1.0mA = I
R
= 20mA, T
A
= +25°C
T
A
= 0°C to +70°C
Reverse Dynamic Impedance
Average Temperature Coefficient
Long Term Stability
Test Conditions
I
R
≤
20mA
TC9491A
Min
Typ Max
1.200
1.180
—
—
1.22
—
8.0
—
1.250
1.290
15
20
TC9491B
Min
Typ
Max
1.200
1.219
—
—
1.220
—
8.0
—
1.250
1.260
15
20
Unit
V
µA
∆V
(BR)R
Z
∆V
(BR)
/∆T
S
I
R
= 100µA
10µA = I
R
= 20mA
I
R
= 100µA,
T
A
= +25°C
±0.1°C
—
—
—
—
—
—
—
—
—
—
—
0.6
—
20
1.0
1.5
10
20
—
50
—
—
—
—
—
—
—
—
—
—
—
—
0.6
—
20
1.0
1.5
20
25
—
100
—
mV
Ω
ppm/°C
ppm/kHR
3-16
TELCOM SEMICONDUCTOR, INC.
LOW POWER, BANDGAP
VOLTAGE REFERENCES
TC9491A
TC9491B
TYPICAL APPLICATIONS
10V Reference
+15V
3
+
7
6
2
TC911
–
4
V
OUT
= 10V
1
Battery Powered 1.25V Reference
+9V
2
TC9491
+15V
81 kΩ
2
–
7
6
3
TC911
+
4
1 µF
50 k
Ω
360 kΩ
1.25V
1.22V
TC9491
180 kΩ
TC9491
30 kΩ
0.1 µF
R
SET
3
I
OUT
= 1.22V
R
SET
TYPICAL CHARACTERISTICS
Output Voltage vs. Reverse Current
1000
OUTPUT VOLTAGE CHANGE (mV)
REVERSE CURRENT (µA)
Output Voltage Change vs. Reverse Current
10
T
A
= +25°C
8
4
T
A
= +25°C
100
6
10
5
0.1
1
10
REVERSE CURRENT (mA)
100
4
1
2
0
0.01
0.1
0
0.25 0.5 0.75 1.0 1.25
OUTPUT VOLTAGE (V)
1.5
6
Forward Voltage vs. Forward Current
1.2
Response Time
10.0
T
A
= +25°C
5.0
INPUT
VOLTAGE (V)
T
A
= +25°C
FORWARD VOLTAGE (V)
1.0
0.8
0.6
0.4
0.2
0
0.01
0
1.5
1.0
0.5
0
0
200
400
TIME (µsec)
600
OUTPUT
7
0.1
1
10
FORWARD CURRENT (mA)
100
8
3-17
TELCOM SEMICONDUCTOR, INC.
ADI Reference Circuit
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