Texas Instruments LT1009CLPM, LT1009CLP, LT1009CDR, LT1009CD, LT1009Y Datasheet

CHIP

LT1009Y

LT1009

2.5-V INTEGRATED REFERENCE CIRCUITS

SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

D

Excellent Temperature Stability

D

Initial Tolerance . . . 0.2% Max

D

Dynamic Impedance . . . 0.6 Ω Max

D

Wide Operating Current Range

D

Directly Interchangeable With LM136

D

Needs No Adjustment for Minimum
Temperature Coefficient

D

Surface-Mount Three-Lead Package

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 α

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.

vz

.

ANODE

NC–No internal connection

logic symbol

ANODE CATHODE

D PACKAGE

(TOP VIEW)

NC

1

NC

2

NC

3
4

LP PACKAGE

(TOP VIEW)

ADJ

CATHODE

8

NC

7

CATHODE

6

ADJ

5

ANODE
CATHODE

ADJ

The L T1009 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 L T1009C is characterized for operation from 0°C to 70°C. The L T1009I is characterized for operation from
–40°C to 85°C.

AVAILABLE OPTIONS
PACKAGED DEVICES

T

A

0°C to 70°C LT1009CD LT1009CLP

–40°C to 85°C LT1009ID LT1009ILP

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.

SMALL

OUTLINE

(D)

PLASTIC

CYLINDRICAL

(LP)

FORM

(Y)

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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Copyright  1999, Texas Instruments Incorporated

1

LT1009

Operating free-air temperature range, T

°C

2.5-V INTEGRATED REFERENCE CIRCUITS

SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

schematic

Q14 Q11

Q8

CATHODE

24 kΩ 24 kΩ 6.6 kΩ

20 pF

Q2

Q1

Q3

All component values shown are nominal.

absolute maximum ratings over operating free-air temperature range

Reverse current, I

R

Q7

10 kΩ

30 pF

Q9

Q4

Q6

Q12

Q5

720 Ω

Q10

500 Ω

30 kΩ

ADJ

6.6 kΩ

Q13

ANODE

†

20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Forward current, IF 10 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θ

, (see Notes 1 and 2):D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .

JA

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, T

†

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 T

temperature is PD = (T

2. The package thermal impedance is calculated in accordance with JESD 51.

J(max)

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

,

θ

– TA)/

J(max)

θ

. Operation at the absolute maximum TJ of 150°C can impact reliability.

JA

, and TA. The maximum allowable power dissipation at any allowable ambient

JA

recommended operating conditions

p

2

p

A

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MIN MAX UNIT

LT1009C 0 70
LT1009I –40 85

°

PARAMETER

TEST CONDITIONS

T

†

UNIT

25°C

VZReference voltage

I

mA

V

Full range

Adjustment range

25°C

mV

∆V

Full range

mV

ppm/°C

∆V

I

400 µA to 10 mA

mV

I

mA

Ω

PARAMETER

TEST CONDITIONS

UNIT

Adjustment range

mV

LT1009

2.5-V INTEGRATED REFERENCE CIRCUITS

SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

electrical characteristics at specified free-air temperature

A

D package

= 1

Z

V

Z(temp)

α

∆VZ/∆t

z

z

†

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.

Forward voltage IF = 2 mA 25°C 0.4 1 0.4 1 V

F

IZ = 1 mA,
V

ADJ

IZ = 1 mA,
V

ADJ

Change in
reference voltage
with temperature

Average
temperature

VZ

coefficient of
reference voltage

Change in
reference voltage

Z

with current
Long-term change

in reference
voltage

Reference
impedance

‡

=

Z

IZ = 1 mA 25°C 20 20 ppm/khr

= 1

Z

LP package
D package
LP package

= GND to V

= 0.6 V to VZ – 0.6 V

Z

D package
LP package

°

°

0°C to 70°C 15 25 30

–40°C to 85°C 20

25°C 2.6 10 2.6 6

Full range 12 10

25°C 0.3 1 0.3 1

Full range 1.4 1.4

LT1009C LT1009I

MIN TYP MAX MIN TYP MAX

2.49 2.5 2.51 2.49 2.5 2.51

2.495 2.5 2.505 2.495 2.5 2.505

2.485 2.515 2.475 2.525

2.491 2.509 2.48 2.52

125 125

45 45

5 15
4 15

pp

°

electrical characteristics at TA = 25°C

LT1009Y

MIN TYP MAX

V

Z

V

F

∆V

Z(temp)

α

VZ

∆V

Z

∆VZ/∆t Long-term change in reference voltage IZ = 1 mA 20 ppm/khr
z

z

‡

The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.

Reference voltage IZ = 1 mA 2.49 2.5 2.51 V
Forward voltage IF = 2 mA 0.4 1 V

IZ = 1 mA, V
IZ = 1 mA, V

Change in reference voltage with temperature 2.5 mV
Average temperature coefficient of

reference voltage
Change in reference voltage with current IZ = 400 µA to 10 mA 2.6 mV

Reference impedance IZ = 1 mA 0.3 1 W

‡

= GND to V

ADJ

= 0.6 V to VZ –0.6 V 45

ADJ

Z

125

15 ppm/°C

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3

LT1009

2.5-V INTEGRATED REFERENCE CIRCUITS

SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

REFERENCE VOLTAGE

FREE-AIR TEMPERATURE

2.53
Iz = 1 mA

2.52

2.51

2.5

2.49

– Reference Voltage – V

Z

V

2.48

2.47

– 50 – 25 0 25 50 75

TA – Free-Air Temperature – °C

Figure 1

vs

TYPICAL CHARACTERISTICS

CHANGE IN REFERENCE VOLTAGE

5

4

3

2

1

– Change in Reference Voltage – mV

Z

∆V

100 125

0

048121620

†

vs

REFERENCE CURRENT

IZ – Reference Current – mA

Figure 2

REVERSE CURRENT

vs

REVERSE VOLTAGE

–1

10

–2

10

–3

10

– Reverse Current – A

R

I

–4

10

–5

10

0.6 1 1.4 1.8 2.2 2.6

TJ = 125°C

TJ = –55°C

TJ = 25°C

VR – Reverse Voltage – V

Figure 3

FORWARD VOLTAGE

vs

FORWARD CURRENT

1.2
TJ = 25°C

1

0.8

0.6

0.4

– Forward Voltage – V

F

V

0.2

0

0.001 0.01 0.1 1 10
IF – Forward Current– mA

Figure 4

†

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

REFERENCE IMPEDANCE

vs

FREQUENCY

100

Iz = 1 mA
TJ = –55°C to 125°C

10

1

– Reference Impedance – Ω

z

z

0.1

0.01 0.1 1 10 100
f – Frequency – kHz

Figure 5

3.5
3

2.5
2

1.5
1

0.5
0

250

Iz = 1 mA
TJ = 25°C

200

nV/ Hz– Noise Voltage –

150

100

n

V

50

10 100 1 k 10 k 100 k

TRANSIENT RESPONSE

Output

5 kΩ

Input

NOISE VOLTAGE

vs

FREQUENCY

f – Frequency – Hz

Figure 6

Input and Output Voltages – V

8
4
0

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Output

Input

01

t – Time – µs

Figure 7

20

5

LT1009

2.5-V INTEGRATED REFERENCE CIRCUITS

SLVS013G – MAY 1987 – REVISED NOVEMBER 1999

APPLICATION INFORMATION

5 V to 35 V

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–

3.6 kΩ

Output

†

10 kΩ
Trim

R

62 Ω

LT1009

10 kΩ

Figure 9. Adjustable Reference With Wide Supply Range

LT1084

V

I

10 µF

ADJ

OUTIN

10 µF

LT1009

1.2 kΩ

V

374 Ω

2 kΩ

O

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

5 V

5.1 kΩ

5 V

–5 V

5.1 kΩ

LT1009

5 kΩ

–5 V

10 kΩ
1%

9.76 kΩ
1%

500 Ω

Figure 11. Switchable ±1.25-V Bipolar Reference

1 µF

10 kΩ

VI ≥ 6 V

1 kΩ

100 kΩ

1 kΩ10 kΩ

+

20 µF

–

+

LT1001C

Output

2.5 V

LT1009

+

20 µF

Figure 12. Low-Noise 2.5-V Buffered Reference

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7

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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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Copyright  1999, Texas Instruments Incorporated