TI LT1009CD

LT1009
2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999
D
D
D
D
D
D
D
D PACKAGE
(TOP VIEW)
Excellent Temperature Stability
Initial Tolerance . . . 0.2% Max
Dynamic Impedance . . . 0.6 Ω Max
Wide Operating Current Range
Directly Interchangeable With LM136
Needs No Adjustment for Minimum
Temperature Coefficient
Surface-Mount Three-Lead Package
NC
NC
NC
ANODE
1
8
2
7
3
6
4
5
CATHODE
NC
CATHODE
ADJ
NC – No internal connection
description
The
LT1009
reference
circuit
is
a
precision-trimmed 2.5-V shunt regulator featuring
low dynamic impedance and a wide operating
current range. The maximum initial tolerance is
± 5 mV in the LP package and ± 10 mV in the
D package. The reference tolerance is achieved
by on-chip trimming, which minimizes the initial
voltage tolerance and the temperature
coefficient αvz.
Although the LT1009 needs no adjustments, a
third terminal (ADJ ) allows the reference voltage
to be adjusted ± 5% to eliminate system errors. In
many applications, the LT1009 can be used as a
terminal-for-terminal replacement for the
LM136-2.5, which eliminates the external trim
network.
LP PACKAGE
(TOP VIEW)
ANODE
CATHODE
ADJ
logic symbol
ANODE
CATHODE
ADJ
The LT1009 uses include 5-V system references, 8-bit ADC and DAC references, and power-supply monitors.
The device also can be used in applications such as digital voltmeters and current-loop measurement and
control systems.
The LT1009C is characterized for operation from 0°C to 70°C. The LT1009I is characterized for operation from
– 40°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
SMALL
OUTLINE
(D)
PLASTIC
CYLINDRICAL
(LP)
0°C to 70°C
LT1009CD
LT1009CLP
– 40°C to 85°C
LT1009ID
LT1009ILP
CHIP
FORM
(Y)
LT1009Y
The D and LP packages are available taped and reeled. Add the suffix R to device
type (e.g., LT1009CDR). Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright  1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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LT1009
2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999
schematic
CATHODE
Q14
Q11
24 kΩ
24 kΩ
6.6 kΩ
Q8
20 pF
Q7
30 pF
Q10
10 kΩ
500 Ω
Q2
Q9
Q4
30 kΩ
ADJ
Q1
6.6 kΩ
Q6
Q3
Q12
Q5
720 Ω
Q13
ANODE
All component values shown are nominal.
absolute maximum ratings over operating free-air temperature range†
Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Package thermal impedance, θJA, (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D and LP packages . . . . . . . . . . . . . 260°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
† Stresses beyond 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-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/θJA. Operation at the absolute maximum TJ of 150°C can impact reliability.
2. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions
LT1009C
Operating free
free-air
air temperature range
range, TA
2
LT1009I
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MIN
MAX
0
70
–40
85
UNIT
°C
LT1009
2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999
electrical characteristics at specified free-air temperature
PARAMETER
D package
VZ
Reference voltage
IZ = 1 mA
LP package
VF
Forward voltage
Adjustment range
∆VZ(t
Z(temp))
Change in
reference voltage
with temperature
αVZ
Average
temperature
coefficient of
reference voltage‡
25°C
LP package
D package
LT1009C
TA†
TEST CONDITIONS
Full range
IF = 2 mA
IZ = 1 mA,
VADJ = GND to VZ
LT1009I
MIN
TYP
MAX
MIN
TYP
2.49
2.5
2.51
MAX
2.49
2.5
2.51
2.495
2.5 2.505 2.495
2.5
2.505
2.485
2.515 2.475
2.491
2.509
2.48
2.52
0.4
1
0.4
1
25°C
125
125
45
45
2.525
25°C
IZ = 1 mA,
VADJ = 0.6 V to VZ – 0.6 V
UNIT
V
V
mV
D package
5
15
4
15
25
30
Full range
mV
LP package
0°C to 70°C
15
ppm/°C
– 40°C to 85°C
∆VZ
Change in
reference voltage
with current
IZ = 400 µA to 10 mA
∆VZ/∆t
Long-term change
in reference
voltage
IZ = 1 mA
zz
Reference
impedance
IZ = 1 mA
25°C
20
2.6
10
2.6
6
mV
Full range
12
25°C
20
25°C
0.3
Full range
10
20
1
0.3
1.4
ppm/khr
1
1.4
Ω
† Full range is 0°C to 70°C for the LT1009C and – 40°C to 85°C for the LT1009I.
‡ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.
electrical characteristics at TA = 25°C
PARAMETER
VZ
VF
TEST CONDITIONS
Reference voltage
IZ = 1 mA
IF = 2 mA
Forward voltage
IZ = 1 mA,
IZ = 1 mA,
Adjustment range
LT1009Y
TYP
MAX
2.49
2.5
2.51
V
1
V
0.4
VADJ = GND to VZ
VADJ = 0.6 V to VZ – 0.6 V
UNIT
MIN
125
mV
45
∆VZ(temp)
Change in reference voltage with temperature
2.5
mV
α VZ
Average temperature coefficient of
reference voltage‡
15
ppm/°C
∆VZ
∆VZ/∆t
Change in reference voltage with current
Long-term change in reference voltage
IZ = 400 µA to 10 mA
IZ = 1 mA
2.6
mV
20
ppm/khr
zz
Reference impedance
IZ = 1 mA
0.3
1
W
‡ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.
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LT1009
2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999
TYPICAL CHARACTERISTICS†
REFERENCE VOLTAGE
vs
FREE-AIR TEMPERATURE
CHANGE IN REFERENCE VOLTAGE
vs
REFERENCE CURRENT
2.53
5
∆V Z – Change in Reference Voltage – mV
Iz = 1 mA
V Z – Reference Voltage – V
2.52
2.51
2.5
2.49
2.48
2.47
– 50
– 25
100
0
25
50
75
TA – Free-Air Temperature – °C
4
3
2
1
0
125
0
4
8
12
16
IZ – Reference Current – mA
Figure 1
20
Figure 2
REVERSE CURRENT
vs
REVERSE VOLTAGE
FORWARD VOLTAGE
vs
FORWARD CURRENT
10 – 1
1.2
TJ = 25°C
V F – Forward Voltage – V
I R – Reverse Current – A
1
10 – 2
10 – 3
TJ = 125°C
10 – 4
TJ = – 55°C
0.6
0.4
0.2
TJ = 25°C
10 – 5
0.6
0.8
1
1.4
1.8
2.2
VR – Reverse Voltage – V
2.6
0
0.001
0.01
0.1
1
IF – Forward Current– mA
Figure 4
Figure 3
† Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
4
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LT1009
2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999
TYPICAL CHARACTERISTICS
NOISE VOLTAGE
vs
FREQUENCY
REFERENCE IMPEDANCE
vs
FREQUENCY
250
100
Iz = 1 mA
TJ = 25°C
Hz
200
V n – Noise Voltage – nV/
10
1
0.1
0.01
0.1
1
10
f – Frequency – kHz
150
100
50
10
100
100
Figure 5
1k
10 k
f – Frequency – Hz
100 k
Figure 6
TRANSIENT RESPONSE
3.5
3
Output
2.5
Input and Output Voltages – V
z z – Reference Impedance – Ω
Iz = 1 mA
TJ = – 55°C to 125°C
2
1.5
1
0.5
5 kΩ
Input
0
Output
8
Input
4
0
0
1
20
t – Time – µs
Figure 7
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LT1009
2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999
APPLICATION INFORMATION
5 V to 35 V
3.6 kΩ
Output
10 kن
Trim
LT1009
†This does not affect temperature coefficient. It provides ± 5% trim range.
Figure 8. 2.5-V Reference
3.6 V to 40 V
V+
LM334
V–
R
62 Ω
LT1009
10 kΩ
Figure 9. Adjustable Reference With Wide Supply Range
LT1084
VI
10 µF
IN
ADJ
OUT
VO
10 µF
1.2 kΩ
374 Ω
LT1009
2 kΩ
Figure 10. Power Regulator With Low Temperature Coefficient
6
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LT1009
2.5-V INTEGRATED REFERENCE CIRCUITS
SLVS013G – MAY 1987 – REVISED NOVEMBER 1999
APPLICATION INFORMATION
5V
5.1 kΩ
5V
5.1 kΩ
10 kΩ
1%
LT1009
–5 V
Output
9.76 kΩ
1%
500 Ω
5 kΩ
–5 V
Figure 11. Switchable ± 1.25-V Bipolar Reference
1 µF
10 kΩ
VI ≥ 6 V
1 kΩ
–
10 kΩ
2.5 V
1 kΩ
+
+
100 kΩ
LT1009
+
LT1001C
20 µF
20 µF
Figure 12. Low-Noise 2.5-V Buffered Reference
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7
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Copyright  1999, Texas Instruments Incorporated