Linear Technology LT1389 Datasheet

FEATURES

LT1389

Nanopower Precision

Shunt Voltage Reference

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DESCRIPTIO

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Initial Voltage Accuracy: 0.05%

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Low Operating Current: 800nA

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Low Drift: 10ppm/°C Max

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Less Than 1Ω Dynamic Impedance

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Available in 1.25V, 2.5V, 4.096V and
5V SO-8 Packages

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APPLICATIO S

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Portable Meters

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Precision Regulators

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A/D and D/A Converters

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Calibrators

TYPICAL APPLICATIO

The LT®1389 is a nanopower, precision shunt voltage
reference. The bandgap reference uses trimmed preci­sion thin-film resistors and improved curvature correction
techniques to achieve 0.05% initial voltage accuracy with
guaranteed 10ppm/°C maximum temperature drift. Volt­age regulation is maintained to an ultralow 800nA operating
current. Advances in design, processing and packaging
achieve low temperature cycling hysteresis.

The LT1389 does not require an output compensation
capacitor, but is stable with capacitive loads. Low dy­namic impedance makes the LT1389 reference easy to
use from unregulated supplies.

The LT1389 reference can be used as a high performance
upgrade to the LM185/LM385, LT1004, LT1034 and
LT1634 where lowest power and guaranteed tempera­ture drift are required.

, LTC and LT are registered trademarks of Linear Technology Corporation.

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5V

4.7M

LT1389-1.25

V

OUT

1.25V

1389 TA01

Temperature Drift

2.0
IR = 0.8µA

= 1.25V

V

1.5

OUT

1.0

0.5

0

–0.5

–1.0

–1.5

REFERENCE VOLTAGE CHANGE (mV)

–2.0

10 20 40

0

30

TEMPERATURE (°C)

50 60

70

1389 TA02

1

LT1389

PACKAGE/ORDER I FOR ATIO

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W

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Operating Current

1.25V............................................................... 20mA

2.5V................................................................. 20mA

4.096V............................................................. 10mA

5V.................................................................... 10mA

Forward Current .................................................. 20mA

Operating Temperature Range ..................... 0°C to 70°C

Storage Temperature Range (Note 2) ... –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

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AVAILABLE OPTIO S

ORDER PART

NUMBER

1

DNC*

2

DNC*

3

DNC*

4

GND

8-LEAD PLASTIC SO

T

= 125°C, θJA = 190°C/W

JMAX

TOP VIEW

S8 PACKAGE

8

DNC*

7

DNC*

6

V

OUT

5

GND

LT1389ACS8-1.25
LT1389BCS8-1.25
LT1389BCS8-2.5
LT1389BCS8-4.096
LT1389BCS8-5

S8 PART MARKING
389A12

389B12

1389B4
1389B5

389B25

*Connected internally. Do Not Connect external circuitry to these pins.
Consult factory for Industrial and Military grade parts.

OUTPUT

TEMPERATURE VOLTAGE ACCURACY (%) (ppm/°C) PART TYPE PART MARKING

0°C to 70°C 1.250 0.05 10 LT1389ACS8-1.25 389A12

1.250 0.05 20 LT1389BCS8-1.25 389B12

2.500 0.05 20 LT1389BCS8-2.5 389B25

4.096 0.075 50 LT1389BCS8-4.096 1389B4

5.000 0.075 50 LT1389BCS8-5 1389B5

1.25V ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage LT1389ACS8/LT1389BCS8 (IR = 0.8µA) 1.24937 1.250 1.25062 V

LT1389ACS8 (IR = 0.8µA) ● 1.24849 1.250 1.25149 V

LT1389BCS8 (IR = 0.8µA) ● 1.24762 1.250 1.25237 V

Reverse Breakdown Change 0.8µA ≤ IR ≤ 200µA 0.20 0.4 mV
with Current (Note 4)

200µA ≤ IR ≤ 2mA 0.3 1.0 mV

Minimum Operating Current ● 0.6 µA
Temperature Coefficient LT1389ACS8 (IR = 0.8µA) ● 4 10 ppm/°C

LT1389BCS8 (I

Reverse Dynamic Impedance (Note 5) 0.8µA ≤ IR ≤ 2mA 0.25 0.7 Ω

Low Frequency Noise (Note 6) IR = 0.8µA, 0.1Hz ≤ f ≤ 10Hz 25 µV

TEMPERATURE COEFFICIENT

The ● denotes specifications which apply over the full operating

–0.05 0.05 %

–0.12 0.12 %

–0.19 0.19 %

● 0.20 1.0 mV

● 0.3 2.0 mV

= 0.8µA) ● 4 20 ppm/°C

R

● 0.25 1.5 Ω

P-P

2

LT1389

2.5V ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage LT1389BCS8 (IR = 0.9µA) 2.49875 2.500 2.50125 V

LT1389BCS8 (IR = 0.9µA) ● 2.49525 2.500 2.50475 V

Reverse Breakdown Change 0.9µA ≤ IR ≤ 200µA 0.2 0.5 mV
with Current (Note 4)

200µA ≤ IR ≤ 2mA 0.3 1.0 mV

Minimum Operating Current ● 0.7 µA
Temperature Coefficient IR = 0.9µA ● 8 20 ppm/°C
Reverse Dynamic Impedance (Note 5) 0.9µA ≤ IR ≤ 2mA 0.25 0.75 Ω

Low Frequency Noise (Note 6) IR = 0.9µA, 0.1Hz ≤ f ≤ 10Hz 50 µV

4.096V ELECTRICAL CHARACTERISTICS

operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage LT1389BCS8 (IR = 1.5µA) 4.09293 4.096 4.09907 V

LT1389BCS8 (IR = 1.5µA) ● 4.0788 4.096 4.1132 V

Reverse Breakdown Change 1.5µA ≤ IR ≤ 200µA 0.2 1.5 mV
with Current (Note 4)

200µA ≤ IR ≤ 2mA 0.3 4 mV

Minimum Operating Current ● 1 µA
Temperature Coefficient IR = 1.5µA ● 12 50 ppm/°C
Reverse Dynamic Impedance (Note 5) 1.5µA ≤ IR ≤ 2mA 0.75 2 Ω

Low Frequency Noise (Note 6) IR = 1.5µA, 0.1Hz ≤ f ≤ 10Hz 80 µV

The ● denotes specifications which apply over the full operating

–0.05 0.05 %

–0.19 0.19 %

● 0.2 1.5 mV

● 0.3 2.5 mV

● 0.25 2 Ω

The ● denotes specifications which apply over the full

–0.075 0.075 %

–0.42 0.42 %

● 0.2 3 mV

● 0.3 6 mV

● 0.75 3 Ω

P-P

P-P

3

LT1389

5V ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Reverse Breakdown Voltage LT1389BCS8 (IR = 1.5µA) 4.99625 5.000 5.00375 V

LT1389BCS8 (IR = 1.5µA) ● 4.979 5.000 5.021 V

Reverse Breakdown Change 1.5µA ≤ IR ≤ 200µA 0.2 1.5 mV
with Current (Note 4)

200µA ≤ IR ≤ 2mA 0.3 4 mV

Minimum Operating Current ● 1 µA
Temperature Coefficient IR = 1.5µA ● 12 50 ppm/°C
Reverse Dynamic Impedance (Note 5) 1.5µA ≤ IR ≤ 2mA 0.75 2 Ω

Low Frequency Noise (Note 6) IR = 1.5µA, 0.1Hz ≤ f ≤ 10Hz 100 µV

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: If the part is stored outside of the specific operating temperature
range, the output may shift due to hysteresis.

Note 3: ESD (Electrostatic Discharge) sensitive device. Use proper ESD
handling precautions.

The ● denotes specifications which apply over the full operating

–0.075 0.075 %

–0.42 0.42 %

● 0.2 3 mV

● 0.3 6 mV

● 0.75 3 Ω

P-P

Note 4: Output requires 0.1µF for operating current greater than 1mA.
Note 5: This parameter is guaranteed by “reverse breakdown change with

current” test.
Note 6: Peak-to-peak noise is measured with a single highpass filter at

0.1Hz and 2-pole lowpass filter at 10Hz.

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