LT1389BCS8-5 [Linear]
Nanopower Precision Shunt Voltage Reference; 纳安级精密并联型电压基准
| 型号： | LT1389BCS8-5 |
| 厂家： | 
Linear |
| 描述： | Nanopower Precision Shunt Voltage Reference |
| 文件： | 总12页 (文件大小：208K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1389
Nanopower Precision
Shunt Voltage Reference
U
FEATURES
DESCRIPTIO
The LT®1389 is a nanopower, precision shunt voltage
reference. The bandgap reference uses trimmed preci-
sionthin-filmresistorsandimprovedcurvaturecorrection
techniques to achieve 0.05% initial voltage accuracy with
guaranteed 10ppm/°C maximum temperature drift. Volt-
ageregulationismaintainedtoanultralow800nAoperating
current. Advances in design, processing and packaging
achieve low temperature cycling hysteresis.
■
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
U
APPLICATIO S
The LT1389 does not require an output compensation
capacitor, but is stable with capacitive loads. Low dy-
namic impedance makes the LT1389 reference easy to
use from unregulated supplies.
■
Portable Meters
■
■
■
Precision Regulators
A/D and D/A Converters
Calibrators
TheLT1389referencecanbeusedasahighperformance
upgrade to the LM185/LM385, LT1004, LT1034 and
LT1634 where lowest power and guaranteed tempera-
ture drift are required.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Temperature Drift
2.0
I
= 0.8µA
OUT
R
V
= 1.25V
1.5
1.0
5V
4.7M
0.5
0
V
OUT
1.25V
–0.5
–1.0
–1.5
LT1389-1.25
1389 TA01
–2.0
10
20
40
50
60
70
0
30
TEMPERATURE (°C)
1389 TA02
1
LT1389
W W U W
U W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
Operating Current
ORDER PART
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
NUMBER
TOP VIEW
LT1389ACS8-1.25
LT1389BCS8-1.25
LT1389BCS8-2.5
LT1389BCS8-4.096
LT1389BCS8-5
1
2
3
4
8
7
6
5
DNC*
DNC*
DNC*
GND
DNC*
DNC*
V
OUT
GND
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
TJMAX = 125°C, θJA = 190°C/ W
389A12
389B12
389B25
1389B4
1389B5
*Connected internally. Do Not Connect external circuitry to these pins.
Consult factory for Industrial and Military grade parts.
U
AVAILABLE OPTIO S
OUTPUT
VOLTAGE
TEMPERATURE COEFFICIENT
TEMPERATURE
ACCURACY (%)
0.05
(ppm/°C)
PART TYPE
PART MARKING
389A12
0°C to 70°C
1.250
1.250
2.500
4.096
5.000
10
20
20
50
50
LT1389ACS8-1.25
LT1389BCS8-1.25
LT1389BCS8-2.5
LT1389BCS8-4.096
LT1389BCS8-5
0.05
389B12
0.05
389B25
0.075
1389B4
0.075
1389B5
1.25V ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
LT1389ACS8/LT1389BCS8 (I = 0.8µA)
MIN
TYP
MAX
UNITS
Reverse Breakdown Voltage
1.24937
–0.05
1.250 1.25062
0.05
V
%
R
LT1389ACS8 (I = 0.8µA)
●
●
1.24849
–0.12
1.250 1.25149
0.12
V
R
%
LT1389BCS8 (I = 0.8µA)
1.24762
–0.19
1.250 1.25237
0.19
V
%
R
Reverse Breakdown Change
with Current (Note 4)
0.8µA ≤ I ≤ 200µA
0.20
0.20
0.4
1.0
mV
mV
R
●
200µA ≤ I ≤ 2mA
0.3
0.3
1.0
2.0
mV
mV
R
●
●
Minimum Operating Current
Temperature Coefficient
0.6
µA
LT1389ACS8 (I = 0.8µA)
●
●
4
4
10
20
ppm/°C
ppm/°C
R
LT1389BCS8 (I = 0.8µA)
R
Reverse Dynamic Impedance (Note 5)
Low Frequency Noise (Note 6)
0.8µA ≤ I ≤ 2mA
0.25
0.25
0.7
1.5
Ω
Ω
R
●
I = 0.8µA, 0.1Hz ≤ f ≤ 10Hz
R
25
µV
P-P
2
LT1389
2.5V ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
LT1389BCS8 (I = 0.9µA)
MIN
TYP
MAX
UNITS
Reverse Breakdown Voltage
2.49875
–0.05
2.500 2.50125
0.05
V
%
R
LT1389BCS8 (I = 0.9µA)
●
●
2.49525
–0.19
2.500 2.50475
0.19
V
%
R
Reverse Breakdown Change
with Current (Note 4)
0.9µA ≤ I ≤ 200µA
0.2
0.2
0.5
1.5
mV
mV
R
200µA ≤ I ≤ 2mA
0.3
0.3
1.0
2.5
mV
mV
R
●
●
●
Minimum Operating Current
Temperature Coefficient
0.7
20
µA
I = 0.9µA
R
8
ppm/°C
Reverse Dynamic Impedance (Note 5)
0.9µA ≤ I ≤ 2mA
0.25
0.25
0.75
2
Ω
Ω
R
●
Low Frequency Noise (Note 6)
I = 0.9µA, 0.1Hz ≤ f ≤ 10Hz
R
50
µV
P-P
4.096V ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
LT1389BCS8 (I = 1.5µA)
MIN
TYP
MAX
UNITS
Reverse Breakdown Voltage
4.09293
–0.075
4.096 4.09907
0.075
V
%
R
LT1389BCS8 (I = 1.5µA)
●
●
4.0788
–0.42
4.096
4.1132
0.42
V
%
R
Reverse Breakdown Change
with Current (Note 4)
1.5µA ≤ I ≤ 200µA
0.2
0.2
1.5
3
mV
mV
R
200µA ≤ I ≤ 2mA
0.3
0.3
4
6
mV
mV
R
●
●
●
Minimum Operating Current
Temperature Coefficient
1
µA
I = 1.5µA
R
12
50
ppm/°C
Reverse Dynamic Impedance (Note 5)
1.5µA ≤ I ≤ 2mA
0.75
0.75
2
3
Ω
Ω
R
●
Low Frequency Noise (Note 6)
I = 1.5µA, 0.1Hz ≤ f ≤ 10Hz
R
80
µV
P-P
3
LT1389
5V ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
LT1389BCS8 (I = 1.5µA)
MIN
TYP
MAX
UNITS
Reverse Breakdown Voltage
4.99625
–0.075
5.000 5.00375
0.075
V
%
R
LT1389BCS8 (I = 1.5µA)
●
●
4.979
–0.42
5.000
5.021
0.42
V
%
R
Reverse Breakdown Change
with Current (Note 4)
1.5µA ≤ I ≤ 200µA
0.2
0.2
1.5
3
mV
mV
R
200µA ≤ I ≤ 2mA
0.3
0.3
4
6
mV
mV
R
●
●
●
Minimum Operating Current
Temperature Coefficient
1
µA
I = 1.5µA
R
12
50
ppm/°C
Reverse Dynamic Impedance (Note 5)
1.5µA ≤ I ≤ 2mA
0.75
0.75
2
3
Ω
Ω
R
●
Low Frequency Noise (Note 6)
I = 1.5µA, 0.1Hz ≤ f ≤ 10Hz
R
100
µV
P-P
Note 1: Absolute Maximum Ratings are those values beyond which the life
Note 4: Output requires 0.1µF for operating current greater than 1mA.
of a device may be impaired.
Note 5: This parameter is guaranteed by “reverse breakdown change with
Note 2: If the part is stored outside of the specific operating temperature
current” test.
range, the output may shift due to hysteresis.
Note 6: Peak-to-peak noise is measured with a single highpass filter at
Note 3: ESD (Electrostatic Discharge) sensitive device. Use proper ESD
0.1Hz and 2-pole lowpass filter at 10Hz.
handling precautions.
4
LT1389
U W
1.25V TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Voltage Change
vs Current
Reverse Characteristics
Temperature Drift
1.2
2.0
1.0
0.8
0.6
0.4
0.2
0
T
= –40°C TO 85°C
A
1.5
1.0
1.0
0.8
0.5
0
–40°C
0.6
0.4
0.2
0
I
= 250µA
R
25°C
85°C
–0.5
–1.0
–1.5
I
= 0.8µA
R
–2.0
0.001
0.01
0.1
1
10
–20
0
40
60
80
–40
20
0
0.4
0.8
1.2
1.6
REVERSE CURRENT (mA)
TEMPERATURE (°C)
REVERSE VOLTAGE (V)
1389-1.25 G03
1389-1.25 G02
1389-1.25 G01
Reverse Dynamic Impedance
Forward Characteristics
Dynamic Impedance vs Frequency
1000
100
10
1.0
0.9
0.8
0.7
100
10
T
= 25°C
T
= 25°C
A
T
= 25°C
A
A
f = 25Hz
0.6
0.5
I
= 0.8µA
I
= 0.8µA
R
R
1
C
= 0µF
C
= 0.047µF
OUT
OUT
0.4
0.3
0.2
0.1
0
I
= 10µA
= 0.1µF
R
C
OUT
1
0.1
I
= 10µA
OUT
R
C
= 0µF
0.1
0.001
0.01
0.01
0.1
1
10
0.001
0.01
0.1
1
10
100
0.01
0.1
1
10
REVERSE CURRENT (mA)
FREQUENCY (kHz)
FORWARD CURRENT (mA)
1389-1.25 G04
1389-1.25 G06
1389-1.25 G05
0.1Hz to 10Hz Noise
Response Time
Response Time
25
20
I
= 0.8µA
R
1.5V
1V
1.5V
1V
0.5V
0V
15
0.5V
0V
10
5
5V
0V
5V
0V
0
–5
–10
–15
–20
–25
1389-1.25 G08
1389-1.25 G09
I
R = 0.8µA
I
R = 0.8µA
1ms/DIV
200ms/DIV
COUT = 0.1µF
COUT = 0µF
0
10
20
30
40
50
60
70
TIME (SEC)
1389-1.25 G07
5
LT1389
2.5V TYPICAL PERFOR A CE CHARACTERISTICS
U W
Reverse Voltage Change
vs Current
Reverse Characteristics
Temperature Drift
4.0
1000
800
600
400
200
0
2.0
1.6
1.2
0.8
0.4
0
T
= –40°C TO 85°C
A
3.0
2.0
–40°C
1.0
0
I
= 250µA
R
–1.0
–2.0
–3.0
I
R
= 0.9µA
25°C
85°C
–4.0
0.8 1.2
REVERSE VOLTAGE (V)
–40
–20
0
20
40
60
80
0
0.4
1.6 2.0 2.4 2.8
0.001
0.01
0.1
1
10
REVERSE CURRENT (mA)
TEMPERATURE (°C)
1389-2.5 G03
1389-2.5 G01
1389-2.5 TA02
Reverse Dynamic Impedance
Dynamic Impedance vs Frequency
Forward Characteristics
1000
100
10
1.0
0.9
0.8
0.7
100
10
T
= 25°C
T
= 25°C
T
= 25°C
A
A
A
f = 25Hz
I
= 0.9µA
R
0.6
0.5
C
= 0µF
OUT
I
= 0.9µA
R
1
C
= 0.033µF
OUT
0.4
0.3
0.2
0.1
0
I
= 10µA
R
1
0.1
C
= 0.22µF
OUT
I
= 10µA
OUT
R
C
= 0µF
0.1
0.001
0.01
0.01
0.1
1
10
0.001
0.01
0.1
1
10
100
0.01
0.1
1
10
REVERSE CURRENT (mA)
FREQUENCY (kHz)
FORWARD CURRENT (mA)
1389-2.5 G04
1389-2.5 G06
1389-2.5 G05
0.1Hz to 10Hz Noise
Response Time
Response Time
100
80
I
= 0.9µA
R
3V
2V
1V
0V
3V
2V
1V
0V
60
40
20
5V
0V
5V
0V
0
–20
–40
–60
–80
–100
1389-2.5 G08
1389-2.5 G09
IR = 0.9µA
OUT = 0.1µF
I
R = 0.9µA
1ms/DIV
200ms/DIV
C
C
OUT = 0µF
0
10
20
30
40
50
60
70
TIME (SEC)
1389-2.5 G07
6
LT1389
U W
4.096V TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Voltage Change
vs Current
Reverse Characteristics
Temperature Drift
2.0
1.6
1.2
0.8
0.4
0
8
1000
800
T
A
= –40°C TO 85°C
6
4
–40°C
2
0
600
I
= 250µA
= 1.5µA
R
400
200
0
–2
–4
–6
I
R
25°C
85°C
–8
0.001
0.01
0.1
1
10
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
REVERSE VOLTAGE (V)
–40
–20
0
20
40
60
80
REVERSE CURRENT (mA)
TEMPERATURE (°C)
1389-4 G03
1389-4 G01
1389-4 G02
Reverse Dynamic Impedance
Forward Characteristics
Dynamic Impedance vs Frequency
1.0
0.9
0.8
0.7
1000
100
10
100
10
T
= 25°C
T = 25°C
A
A
T
= 25°C
A
f = 25Hz
0.6
0.5
1
I
= 1.5µA
R
C
= 0.047µF
OUT
0.4
0.3
0.2
0.1
0
I
= 1.5µA
R
C
= 0µF
OUT
0.1
1
I = 10µA
R
I
= 10µA
OUT
R
C = 0.68µF
OUT
C
= 0µF
0.01
0.1
0.001
0.001
0.01
0.1
1
10
100
0.01
0.1
1
10
0.01
0.1
1
10
FREQUENCY (kHz)
REVERSE CURRENT (mA)
FORWARD CURRENT (mA)
1389-4 G06
1389-4 G04
1389-4 G05
Response Time
Response Time
4V
0V
4V
0V
10V
0V
10V
0V
1389-4 G08
1389-4 G09
IR = 1.5µA
OUT = 0.1µF
IR = 1.5µA
COUT = 0µF
2ms/DIV
200ms/DIV
C
7
LT1389
5V TYPICAL PERFOR A CE CHARACTERISTICS
U W
Reverse Voltage Change
vs Current
Reverse Characteristics
Temperature Drift
2.0
1.6
1.2
0.8
0.4
0
1000
800
8
T
= –40°C TO 85°C
A
6
4
–40°C
2
0
600
25°C
400
200
0
–2
–4
–6
I
= 250µA
= 1.5µA
R
85°C
I
R
–8
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
REVERSE VOLTAGE (V)
0.001
0.01
0.1
1
10
–20
0
40
60
80
–40
20
REVERSE CURRENT (mA)
TEMPERATURE (°C)
1389-4 G03
1389-4 G01
1389-5 G02
Reverse Dynamic Impedance
Forward Characteristics
Dynamic Impedance vs Frequency
1.0
0.9
0.8
0.7
100
10
1000
100
10
T
= 25°C
T = 25°C
A
A
T
= 25°C
A
f = 25Hz
0.6
0.5
1
I
= 1.5µA
R
C
OUT
= 0.047µF
0.4
0.3
0.2
0.1
0
I
= 1.5µA
R
C
= 0µF
OUT
0.1
1
I
= 10µA
= 0.1µF
R
I
= 10µA
= 0µF
R
C
OUT
C
OUT
0.01
0.1
0.001
0.01
0.1
1
10
0.001
0.01
0.1
1
10
100
0.01
0.1
1
10
FREQUENCY (kHz)
REVERSE CURRENT (mA)
FORWARD CURRENT (mA)
1389-5 G06
1389-5 G04
1389-4 G05
Response Time
Response Time
4V
2V
0V
4V
2V
0V
10V
0V
10V
0V
1389-5 G08
1389-5 G09
IR = 1.5µA
OUT = 0.1µF
IR = 1.5µA
OUT = 0µF
2ms/DIV
200ms/DIV
C
C
8
LT1389
W U U
APPLICATIO S I FOR ATIO
U
The reverse characteristics of the LT1389 resembles a
simple resistor Zener diode parallel connection. This well
behaved characteristic is important to the proper opera-
tion 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.
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 perfor-
mance. 1.5GΩ of leakage between a DNC pin and a 5V
supply will conduct 2.5nA which induces a 0.2% error in
V
OUT. Board leakage can be minimized by encircling the
DNC pins with a guard ring operated at a potential of VOUT
.
By tying the guard ring to VOUT as shown in Figure 2,
leakage paths are eliminated.
V
≥ 10.5V
IN
V
– 1.25V
0.8µA
OUT
R
=
B
+
V
OUT
LT1495
LT1389-1.25
1.5V TO 10V
R1
249k TO 8.66M
–
R2
1.24M
1389 F01
Figure 1. Adjustable Output Voltage Reference
BOARD METAL TRACE
1
2
3
4
8
7
6
5
DNC
DNC
DNC
GND
DNC
DNC
LT1389
V
OUT
GND
1389 F02
Figure 2. Guard Ring to Reduce Board Leakage
9
LT1389
TYPICAL APPLICATIO S
U
2.5V Output, Low Noise Reference
1µF
V
≥ 3V
10k
IN
–
510k
LT1495
2.5V
10k
1k
+
+
+
20µF*
100k
LT1389-2.5
20µF*
*WET SLUG TANTALUM
1389 TA04
Micropower Voltage and Current Reference
R3
2 AAA
ALKALINE
CELLS
R4
249k
300k
0.1%
5%
–
+
ZTX214C
1/2 LT1495
1/2 LT1495
+
R1
200k
0.1%
–
R2
1M
LT1389-1.25
0.1%
I
= 1µA
COM
V
OUT
= 1.5V
OUT
1389 TA03
R1 TO R3: MAR5 SERIES, IRC (512) 992-7900
10
LT1389
U
PACKAGE DESCRIPTIO
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
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
*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
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1389
TYPICAL APPLICATIO S
U
Single Cell Li-Ion Battery Supervisory Circuit, IQ = 10µA
OFF
CHARGER
V
BAT
SW
T0 LOAD
1.75V
–
R3
1.75M
0.1%
A2
R
620k
5%
1/4 LT1496
S
R
10M
5%
R
1M
5%
H1
SW
+
+
D1
A1
A
BATTERY
1/4 LT1496
R1
500k
0.1%
R
H2
10M
5%
V
BAT
–
+
D2
A3
–
1/4 LT1496
1.25V
A4
–
1/4 LT1496
+
R2
LT1389-1.25
1.25M
0.1%
R4
1.25M
0.1%
1389 TA05
D1, D2: 1N458
R1 TO R4: CAR6 SERIES IRC (512) 992-7900
SW: PMOS SPECIFIED FOR MAXIMUM LOAD CURRENT
Precision Undervoltage Lockout Circuit
SW1
V
BATT
TO
LOAD
R3
2.05M
1%
R1
3.57M
0.1%
R
1M
5%
SW
B
+
U1
1/2 LT1495
Li-Ion
CELL
4.1V
A
R5
10M
5%
–
U2
LT1389
1.250V
R2
3M
1389 TA06
R4
150k
1%
0.1%
R1, R2: IRC CAR6 SERIES
(512) 992-7900
SW1: PMOS SPECIFIED FOR
MAXIMUM LOAD CURRENT
RELATED PARTS
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
LT1461
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
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
OS
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
1389fa LT/TP 0200 2K REV A • PRINTED IN USA
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
LINEAR TECHNOLOGY CORPORATION 1998
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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