Datasheet LT1389 Datasheet (Linear Technology)

FEATURES

LT1389

Nanopower Precision

Shunt Voltage Reference

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DESCRIPTIO

■

Initial Voltage Accuracy: 0.05%

■

Low Operating Current: 800nA

■

Low Drift: 10ppm/°C Max

■

Less Than 1Ω Dynamic Impedance

■

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

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APPLICATIO S

■

Portable Meters

■

Precision Regulators

■

A/D and D/A Converters

■

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

UU

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.

4

UW

FORWARD CURRENT (mA)

0.001

0.4

FORWARD VOLTAGE (V)

0.5

0.6

0.7

0.8

0.01 0.1 1 10 100

1389-1.25 G06

0.3

0.2

0.1
0

0.9

1.0

TA = 25°C

1.25V TYPICAL PERFOR A CE CHARACTERISTICS

Reverse Characteristics

1.0
TA = –40°C TO 85°C

0.8

0.6

0.4

REVERSE CURRENT (µA)

0.2

0

0

0.4
REVERSE VOLTAGE (V)

0.8

1.2

1.6

1389-1.25 G01

Temperature Drift

2.0

1.5

1.0

0.5

0

IR = 250µA

–0.5

–1.0

–1.5

REFERENCE VOLTAGE CHANGE (mV)

–2.0

–40

IR = 0.8µA

–20 0 40

20

TEMPERATURE (°C)

60

1389-1.25 G02

80

Reverse Voltage Change
vs Current

1.2

1.0

0.8

0.6

0.4

0.2

REVERSE VOLTAGE CHANGE (mV)

0

0.001 0.1 101

0.01
REVERSE CURRENT (mA)

LT1389

–40°C

25°C

85°C

1389-1.25 G03

1000

100

10

1

DYNAMIC IMPEDANCE (Ω)

0.1

0.001

25
20
15
10

5
0

–5

–10

NOISE VOLTAGE (µV/DIV)

–15
–20
–25

0

REVERSE CURRENT (mA)

0.10.01 101

0.1Hz to 10Hz Noise

IR = 0.8µA

10

20

30

40

TIME (SEC)

50

TA = 25°C
f = 25Hz

1389-1.25 G04

1389-1.25 G07

Dynamic Impedance vs Frequency

100

TA = 25°C

10

DYNAMIC IMPEDANCE (kΩ)

0.1

0.01

1

0.01

IR = 0.8µA

= 0µF

C

OUT

I

= 10µA

R

= 0µF

C

OUT

0.1 1 10
FREQUENCY (kHz)

C

OUT

= 0.8µA

I

R

= 0.047µF

IR = 10µA

C

OUT

= 0.1µF

1389-1.25 G05

Response Time

1.5V
1V

0.5V
0V

5V
0V

I

= 0.8µA

R

= 0µF

C

OUT

7060

1ms/DIV

1389-1.25 G08

Forward CharacteristicsReverse Dynamic Impedance

Response Time

1.5V
1V

0.5V
0V

5V
0V

I

= 0.8µA

R

= 0.1µF

C

OUT

200ms/DIV

1389-1.25 G09

5

LT1389

REVERSE CURRENT (mA)

0.4

REVERSE VOLTAGE CHANGE (mV)

0.8

1.2

0.001 0.1 1 10

1389-2.5 G03

0

1.6

2.0

0.01

–40°C

25°C

85°C

FORWARD CURRENT (mA)

0.001

0.4

FORWARD VOLTAGE (V)

0.5

0.6

0.7

0.8

0.01 0.1 1 10 100

1389-2.5 G06

0.3

0.2

0.1
0

0.9

1.0

TA = 25°C

UW

2.5V TYPICAL PERFOR A CE CHARACTERISTICS

Reverse Characteristics

1000

TA = –40°C TO 85°C

800

Temperature Drift

4.0

3.0

2.0

Reverse Voltage Change
vs Current

600

400

REVERSE CURRENT (nA)

200

1000

DYNAMIC IMPEDANCE (Ω)

100

0.1

0

10

1

0.001

0

0.8

0.4
REVERSE VOLTAGE (V)

REVERSE CURRENT (mA)

1.2

1.6 2.0 2.4 2.8

0.10.01 101

1389-2.5 G01

TA = 25°C
f = 25Hz

1389-2.5 G04

1.0

0

= 250µA

I

R

–1.0

–2.0

REVERSE VOLTAGE CHANGE (mV)

–3.0

–4.0

–40

IR = 0.9µA

0

–20 20

TEMPERATURE (°C)

40 60 80

Dynamic Impedance vs Frequency

100

TA = 25°C

10

IR = 0.9µA

= 0µF

C

DYNAMIC IMPEDANCE (kΩ)

0.1

0.01

1

0.01

OUT

IR = 10µA

= 0µF

C

OUT

0.1 1 10
FREQUENCY (kHz)

C

OUT

C

IR = 0.9µA

= 0.033µF

I

R

= 0.22µF

OUT

1389-2.5 TA02

Forward CharacteristicsReverse Dynamic Impedance

= 10µA

1389-2.5 G05

0.1Hz to 10Hz Noise

100

IR = 0.9µA

80
60
40

20

0
–20
–40

NOISE VOLTAGE (µV/DIV)

–60
–80

–100

0

6

10

20

30

TIME (SEC)

40

Response Time

3V
2V
1V
0V

5V
0V

I

= 0.9µA

R

C

= 0µF

OUT

50

7060

1389-2.5 G07

1ms/DIV

1389-2.5 G08

Response Time

3V
2V
1V
0V

5V
0V

= 0.9µA

I

R

C

= 0.1µF

OUT

200ms/DIV

1389-2.5 G09

UW

FORWARD CURRENT (mA)

0.001

0.4

FORWARD VOLTAGE (V)

0.5

0.6

0.7

0.8

0.01 0.1 1 10 100

1389-4 G06

0.3

0.2

0.1
0

0.9

1.0

TA = 25°C

REVERSE CURRENT (mA)

0.8

REVERSE VOLTAGE CHANGE (mV)

1.6

2.0

0.001 0.1 101

1389-4 G03

0

1.2

0.4

0.01

25°C
85°C

–40°C

4.096V TYPICAL PERFOR A CE CHARACTERISTICS

Reverse Characteristics

1000

TA = –40°C TO 85°C

800

Temperature Drift

8

6

4

LT1389

Reverse Voltage Change
vs Current

600

400

REVERSE CURRENT (nA)

200

0

0.5 1.5

0

1.0
REVERSE VOLTAGE (V)

1000

100

10

1

DYNAMIC IMPEDANCE (Ω)

0.1

0.001
REVERSE CURRENT (mA)

3.5

2.5 4.5

3.0

2.0

0.10.01 101

4.0

1389-4 G01

TA = 25°C
f = 25Hz

1389-4 G04

2

0

IR = 250µA

–2

IR = 1.5µA

–4

–6

REFERENCE VOLTAGE CHANGE (mV)

–8

–20 0 40

–40

20

TEMPERATURE (°C)

Dynamic Impedance vs Frequency

100

TA = 25°C

10

DYNAMIC IMPEDANCE (kΩ)

0.1

0.01

1

0.01

IR = 1.5µA

= 0µF

C

OUT

I

= 10µA

R

= 0µF

C

OUT

0.1 1 10
FREQUENCY (kHz)

C

OUT

IR = 1.5µA

= 0.047µF

I

C

OUT

60

= 10µA

R

= 0.68µF

1389-4 G05

80

1389-4 G02

Forward CharacteristicsReverse Dynamic Impedance

Response Time

4V

0V

10V

0V

= 1.5µA

I

R

= 0µF

C

OUT

2ms/DIV

1389-4 G08

Response Time

4V

0V

10V

0V

= 1.5µA

I

R

C

= 0.1µF

OUT

200ms/DIV

1389-4 G09

7

LT1389

FORWARD CURRENT (mA)

0.001

0.4

FORWARD VOLTAGE (V)

0.5

0.6

0.7

0.8

0.01 0.1 1 10 100

1389-5 G06

0.3

0.2

0.1
0

0.9

1.0

TA = 25°C

UW

5V TYPICAL PERFOR A CE CHARACTERISTICS

Reverse Characteristics

1000

TA = –40°C TO 85°C

800

600

400

REVERSE CURRENT (nA)

200

0

0

0.5 1.5

1.0

2.0

REVERSE VOLTAGE (V)

3.5

3.0

4.0

1389-4 G01

2.5 4.5 5.0 5.5

Temperature Drift

8

6

4

2

0

–2

IR = 250µA

–4

IR = 1.5µA

–6

REFERENCE VOLTAGE CHANGE (mV)

–8

–20 0 40

–40

20

TEMPERATURE (°C)

60

80

1389-5 G02

Reverse Voltage Change
vs Current

2.0

1.6

1.2

0.8

0.4

REVERSE VOLTAGE CHANGE (mV)

0

0.001 0.1 101

0.01
REVERSE CURRENT (mA)

–40°C

25°C

85°C

1389-4 G03

1000

100

10

1

DYNAMIC IMPEDANCE (Ω)

0.1

0.001

8

REVERSE CURRENT (mA)

0.10.01 101

Response Time

4V
2V
0V

10V

0V

= 1.5µA

I

R

C

= 0µF

OUT

TA = 25°C
f = 25Hz

1389-5 G04

2ms/DIV

Dynamic Impedance vs Frequency

100

TA = 25°C

10

DYNAMIC IMPEDANCE (kΩ)

0.1

0.01

1

0.01

1389-5 G08

IR = 1.5µA

= 0µF

C

OUT

I

= 10µA

R

= 0µF

C

OUT

0.1 1 10
FREQUENCY (kHz)

C

OUT

IR = 1.5µA

= 0.047µF

C

OUT

I

= 10µA

R

= 0.1µF

1389-4 G05

Response Time

4V
2V
0V

10V

0V

= 1.5µA

I

R

C

= 0.1µF

OUT

Forward CharacteristicsReverse Dynamic Impedance

200ms/DIV

1389-5 G09

WUUU

APPLICATIO S I FOR ATIO

LT1389

The reverse characteristics of the LT1389 resembles a
simple resistor Zener diode parallel connection. This well
behaved characteristic is important to the proper opera­tion of circuits like Figure 1. The adjustable output voltage
reference depends upon positive feedback from the
LT1495’s output to start-up and regulate the bias current
for the LT1389. The LT1389 has no negative resistance
regions that can interfere with the proper start-up of the
buffered reference.

– 1.25V

V

OUT

RB =

0.8µA

LT1389-1.25

Board leakage is a concern for a nanopower precision
shunt voltage reference. The LT1389 requires attention to
detail in board layout in order to maximize its perfor­mance. 1.5GΩ of leakage between a DNC pin and a 5V
supply will conduct 2.5nA which induces a 0.2% error in
V

. Board leakage can be minimized by encircling the

OUT

DNC pins with a guard ring operated at a potential of V
By tying the guard ring to V

as shown in Figure 2,

OUT

OUT

leakage paths are eliminated.

≥ 10.5V

V

IN

+

LT1495

–

1389 F01

V

OUT

1.5V TO 10V

R1
249k TO 8.66M

R2

1.24M

.

Figure 1. Adjustable Output Voltage Reference

BOARD METAL TRACE

DNC

DNC

DNC

GND

1

2

LT1389

3

4

8

DNC

7

DNC

6

V

OUT

5

GND

1389 F02

Figure 2. Guard Ring to Reduce Board Leakage

9

LT1389

TYPICAL APPLICATIO S

U

2.5V Output, Low Noise Reference

≥ 3V

V

IN

1µF

10k

2 AAA

ALKALINE

CELLS

510k

1k10k

–

LT1495

+

+

100k

20µF*

+

20µF*LT1389-2.5

*WET SLUG TANTALUM

1389 TA04

Micropower Voltage and Current Reference

ZTX214C

R3
249k

0.1%

–

1/2 LT1495

R4
300k
5%

+

LT1389-1.25

+

1/2 LT1495

–

2.5V

R1
200k

0.1%

R2
1M

0.1%

10

= 1µA

OUT

R1 TO R3: MAR5 SERIES, IRC [phone]

COMI

V

= 1.5V

OUT

1389 TA03

PACKAGE DESCRIPTIO

U

Dimensions in inches (millimeters) unless otherwise noted.

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*
(4.801 – 5.004)

7

8

5

6

LT1389

0.228 – 0.244

(5.791 – 6.197)

0.010 – 0.020

(0.254 – 0.508)

0.008 – 0.010

(0.203 – 0.254)

*

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

×

°

45

0.016 – 0.050

(0.406 – 1.270)

(1.346 – 1.752)

0°– 8° TYP

0.053 – 0.069

0.014 – 0.019

(0.355 – 0.483)

TYP

0.150 – 0.157**
(3.810 – 3.988)

1

3

2

4

0.004 – 0.010

(0.101 – 0.254)

0.050

(1.270)

BSC

SO8 1298

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

11

LT1389

TYPICAL APPLICATIO S

Single Cell Li-Ion Battery Supervisory Circuit, IQ = 10µA

R

S

620k
5%

+

A1

1/4 LT1496

–

LT1389-1.25

D1, D2: 1N458
R1 TO R4: CAR6 SERIES IRC [phone]
SW: PMOS SPECIFIED FOR MAXIMUM LOAD CURRENT

U

R1
500k

0.1%

R2

1.25M

0.1%

1.75V

1.25V

–

A2

1/4 LT1496

+

V

BAT

+

A3

1/4 LT1496

–

OFF

V

BAT

R3

1.75M

0.1%

R

H1

10M
5%

D1

A BATTERY

R

H2

10M
5%

D2

R4

1.25M

0.1%

CHARGER

–

A4

1/4 LT1496

+

1389 TA05

SW

R
1M
5%

T0 LOAD

SW

Precision Undervoltage Lockout Circuit

1389 TA06

SW1

R
1M
5%

R5
10M
5%

TO
LOAD

SW

Li-Ion
CELL

4.1V

V

BATT

R3

R1

3.57M

0.1%

A

R2
3M

0.1%

2.05M
1%

B

U2
LT1389

1.250V

R4
150k
1%

+

U1

1/2 LT1495

–

R1, R2: IRC CAR6 SERIES
[phone]
SW1: PMOS SPECIFIED FOR
MAXIMUM LOAD CURRENT

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PART NUMBER DESCRIPTION COMMENTS

LTC®1440 Micropower Comparator with Reference 3.7µA Max Supply Current, 1% 1.182V Reference,

MSOP, PDIP and SO-8 Packages

LT1460 Micropower Series Reference 0.075% Max, 10ppm/°C Max Drift, 2.5V, 5V and 10V Versions,

MSOP, PDIP, SO-8, SOT-23 and TO-92 Packages

LT1461 Micropower Precision LDO Series Reference 3ppm/°C Max Drift, 0°C to 70°C, –40°C to 85°C, –40°C to 125°C

Options in SO-8

LT1495 1.5µA Precision Rail-to-Rail Dual Op Amp 1.5µA Max Supply Current, 100pA Max I
LTC1540 Nanopower Comparator with Reference 600nA Max Supply Current, 2% 1.182V Reference,

MSOP and SO-8 Packages

LT1634 Micropower Precision Shunt Voltage Reference 0.05% Max, 10ppm/°C Max Drift, 1.25V, 2.5V, 4.096V, 5V,

10µA Maximum Supply Current

LTC1798 6µA Low Dropout Series Reference Available in Adjustable, 2.5V, 3V, 4.096V and 5V

OS

12

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

[phone] ● FAX: [phone]

●

www.linear-tech.com

1389fa LT/TP 0200 2K REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1998