Document Outline
- Return to Contents
- Features
- Applications
- Pin Configurations
- General Description
- Ordering Information
- Absolue Maximum Ratings
- Electrical Characteristics
- Response Time Test Circuit
- Typical Applications
- Typical Characteristics
3-15
TELCOM SEMICONDUCTOR, INC.
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LOW POWER, BANDGAP VOLTAGE REFERENCES
FEATURES
s
Temperature Coefficient ......................... 50ppm/
C
s
Wide Operating Current Range ....... 15
A to 20mA
s
Dynamic Impedance ......................................... 0.6
s
Output Tolerance ...................................... 1% or 2%
s
Output Voltage Option .................................. 1.220V
s
TO-92 Plastic Package
s
8-Pin Plastic Small Outline (SO) Package
APPLICATIONS
s
ADC and DAC Reference
s
Current Source Generation
s
Threshold Detectors
s
Power Supplies
s
Multi-meters
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 15
A
to 20mA operating current range make these devices at-
tractive for multimeter, data acquisition converter, and tele-
communication voltage references.
Part No.
Package
Temperature Tempco.
Range
TC9491ACOA
8-Pin SOIC
0
C to +70
C
50 ppm
C
TC9491BCOA
8-Pin SOIC
0
C to +70
C
100 ppm
C
TC9491ACZM
TO-92
0
C to +70
C
50 ppm
C
TC9491BCZM
TO-92
0
C to +70
C
100 ppm
C
ORDERING INFORMATION
NC = NO INTERNAL CONNECTION
1
2
3
4
8
7
6
5
CATHODE
NC
NC
NC
NC
NC
NC
ANODE
1
TO-92 PLASTIC
(BOTTOM VIEW)
SURFACE MOUNT
PLASTIC PACKAGE
3
TC9491ACZB
TC94191BCZB
TC9491ACOA
TC94191BOA
PIN CONFIGURATIONS
TC9491A/B-3 8/23/96
TC9491A
TC9491B
3-16
TELCOM SEMICONDUCTOR, INC.
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.
TC9491
OUTPUT
INPUT
36 k
RESPONSE TIME TEST CIRCUIT
ELECTRICAL CHARACTERISTICS:
T
A
= +25
C, unless otherwise specified.
TC9491A
TC9491B
Symbol
Parameter
Test Conditions
Min
Typ
Max
Min
Typ
Max
Unit
V
(BR)R
Reverse Breakdown Voltage
I
R
20mA
1.200
1.22
1.250
1.200
1.220
1.250
V
T
A
= 0
C to +70
C
1.180
--
1.290
1.219
--
1.260
I
RMIN
Minimum Operating Current
A
T
A
= +25
C
--
8.0
15
--
8.0
15
T
A
= 0
C to +70
C
--
--
20
--
--
20
V
(BR)R
Reverse Breakdown Voltage
Change with Current
I
Rmin
= I
R
= 1.0mA, T
A
= +25
C
--
--
1.0
--
--
1.0
T
A
= 0
C to +70
C
--
--
1.5
--
--
1.5
mV
1.0mA = I
R
= 20mA, T
A
= +25
C
--
--
10
--
--
20
T
A
= 0
C to +70
C
--
--
20
--
--
25
Z
Reverse Dynamic Impedance
I
R
= 100
A
--
0.6
--
--
0.6
--
V
(BR)
/
T
Average Temperature Coefficient
10
A = I
R
= 20mA
--
--
50
--
--
100
ppm/
C
S
Long Term Stability
I
R
= 100
A,
--
20
--
--
20
--
ppm/kHR
T
A
= +25
C
0.1
C
LOW POWER, BANDGAP
VOLTAGE REFERENCES
TC9491A
TC9491B
3-17
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
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1
2
8
1000
100
1
0.1
0
0.25
0.5
0.75
1.0
1.25
1.5
OUTPUT VOLTAGE (V)
T
A
= +25
C
10
Output Voltage vs. Reverse Current
REVERSE CURRENT (
A)
10
8
6
4
2
0
0.01
0.1
1
10
100
OUTPUT VOLTAGE CHANGE (mV)
REVERSE CURRENT (mA)
Output Voltage Change vs. Reverse Current
T
A
= +25
C
1.2
1.0
0.8
0.6
0.4
0.2
0
0.01
0.1
1
10
100
FORWARD CURRENT (mA)
FORWARD VOLTAGE (V)
Forward Voltage vs. Forward Current
T
A
= +25
C
OUTPUT
INPUT
5.0
0
1.5
1.0
0.5
0
0
200
400
600
TIME (
sec)
Response Time
T
A
= +25
C
VOLTAGE (V)
10.0
+9V
1.25V
360 k
TC9491
+15V
180 k
0.1 F
1.22V
30 k
50 k
3
2
7
6
4
V
OUT
= 10V
+
TC911
TC9491
TYPICAL APPLICATIONS
10V Reference
Battery Powered 1.25V Reference
+15V
TC9491
1 F
R
SET
81 k
2
3
7
6
4
I
OUT
= 1.22V
R
SET
+
TC911
TYPICAL CHARACTERISTICS
LOW POWER, BANDGAP
VOLTAGE REFERENCES
TC9491A
TC9491B
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