LINER LT1634 Micropower precision shunt voltage reference Datasheet

LT1634
Micropower Precision
Shunt Voltage Reference
Features
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Description
Initial Voltage Accuracy: 0.05%
Low Operating Current: 10µA
Low Drift: 10ppm/°C Max
Less Than 1Ω Dynamic Impedance
Both Commercial and Industrial Temperature Range
Parts Are Available
Available in 1.25V, 2.5V, 4.096V and 5V in SO-8
and TO-92 Packages
1.25V and 2.5V Available in MSOP Package
Applications
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The LT®1634 is a micropower, precision, shunt voltage
reference. The bandgap reference uses trimmed precision
thin film resistors to achieve 0.05% initial voltage accuracy. Improved curvature correction technique guarantees
10ppm/°C maximum temperature drift. Advances in
design, processing and packaging techniques guarantee
10µA operation and low temperature cycling hysteresis.
The LT1634 does not require an output compensation
capacitor, but is stable with capacitive loads. Low dynamic
impedance makes the LT1634 reference easy to use from
unregulated supplies.
The LT1634 reference can be used as a high performance
upgrade to the LM185/LM385, LT1004 and LT1034 where
lower power and guaranteed temperature drift is
required.
Portable Meters
Precision Regulators
A/D and D/A Converters
Calibrators
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Typical Application
Super Accurate ±4.096V Output References
Temperature Drift
5V
45k
2.0
LT1634-4.096
VOUT
4.096V
LT1495
–
–5V
5V
4
5
IS = 200µA
OUTPUT ACCURACY
BETTER THAN 0.075%
AT ±500µA OUTPUT
LTC®1043
6
1µF
15
18
REVERSE VOLTAGE CHANGE (mV)
+
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–40
17
–5V
5V
–
LT1495
1µF
+
IR = 10µA
VOUT = 1.25V
–20
40
60
20
0
TEMPERATURE (°C)
80
100
1634 TA02
VOUT
–4.096V
–5V
1634 TA01
1634ff
For more information www.linear.com/LT1634
1
LT1634
Absolute Maximum Ratings (Note 1)
Current Operating
1.25V................................................................100mA
2.5V....................................................................50mA
4.096V, 5V..........................................................30mA
Forward Current......................................................20mA
Operating Temperature Range
Commercial.............................................. 0°C to 70°C
Industrial..............................................–40°C to 85°C
Storage Temperature Range (Note 1)...... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
pin configuration
BOTTOM VIEW
TOP VIEW
TOP VIEW
DNC*
DNC*
DNC*
GND
1
2
3
4
8
7
6
5
NC***
DNC*
VOUT
TEST**
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 250°C/W
DNC* 1
8 NC***
DNC* 2
7 DNC*
DNC* 3
6 VOUT
GND 4
TEST** VOUT
GND
5 TEST**
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 190°C/W
Z PACKAGE
3-LEAD PLASTIC TO-92
TJMAX = 125°C, θJA = 190°C/W
*Connected internally. Do Not Connect external circuitry to these pins.
**The TEST pin can be left unconnected or connected to the GND pin (GND pin on Z package, Pin4 on MS8 and S8 packages)
*** Not connected internally.
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1634BCMS8-1.25#PBF
LT1634BCMS8-1.25#TRPBF
LTCV
8-Lead Plastic MSOP
LT1634BCMS8-2.5#PBF
LT1634BCMS8-2.5#TRPBF
LTDF
8-Lead Plastic MSOP
LT1634ACS8-1.25#PBF
LT1634ACS8-1.25#TRPBF
1634A1
8-Lead Plastic SO
LT1634ACS8-2.5#PBF
LT1634ACS8-2.5#TRPBF
1634A2
8-Lead Plastic SO
LT1634ACS8-4.096#PBF
LT1634ACS8-4.096#TRPBF
1634A4
8-Lead Plastic SO
LT1634ACS8-5#PBF
LT1634ACS8-5#TRPBF
1634A5
8-Lead Plastic SO
LT1634AIS8-1.25#PBF
LT1634AIS8-1.25#TRPBF
634AI1
8-Lead Plastic SO
LT1634AIS8-2.5#PBF
LT1634AIS8-2.5#TRPBF
634AI2
8-Lead Plastic SO
LT1634AIS8-4.096#PBF
LT1634AIS8-4.096#TRPBF
634AI4
8-Lead Plastic SO
LT1634AIS8-5#PBF
LT1634AIS8-5#TRPBF
634AI5
8-Lead Plastic SO
LT1634BCS8-1.25#PBF
LT1634BCS8-1.25#TRPBF
1634B1
8-Lead Plastic SO
LT1634BCS8-2.5#PBF
LT1634BCS8-2.5#TRPBF
1634B2
8-Lead Plastic SO
LT1634BCS8-4.096#PBF
LT1634BCS8-4.096#TRPBF
1634B4
8-Lead Plastic SO
LT1634BCS8-5#PBF
LT1634BCS8-5#TRPBF
1634B5
8-Lead Plastic SO
LT1634BIS8-1.25#PBF
LT1634BIS8-1.25#TRPBF
634BI1
8-Lead Plastic SO
LT1634BIS8-2.5#PBF
LT1634BIS8-2.5#TRPBF
634BI2
8-Lead Plastic SO
LT1634BIS8-4.096#PBF
LT1634BIS8-4.096#TRPBF
634BI4
8-Lead Plastic SO
LT1634BIS8-5#PBF
LT1634BIS8-5#TRPBF
634BI5
8-Lead Plastic SO
LT1634CCZ-1.25#PBF
LT1634CCZ-1.25#TRPBF
3-Lead Plastic TO-92
LT1634CCZ-2.5#PBF
LT1634CCZ-2.5#TRPBF
3-Lead Plastic TO-92
LT1634CCZ-4.096#PBF
LT1634CCZ-4.096#TRPBF
3-Lead Plastic TO-92
LT1634CCZ-5#PBF
LT1634CCZ-5#TRPBF
3-Lead Plastic TO-92
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2
For more information www.linear.com/LT1634
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
1634ff
LT1634
available options
TEMPERATURE
0°C to 70°C
ACCURACY (%)
0.05
TEMPERATURE COEFFICIENT
(ppm/°C)
10
–40°C to 85°C
0.05
10
0°C to 70°C
0.05
25
–40°C to 85°C
0.05
25
0°C to 70°C
0.20
25
PACKAGE TYPE
S8
LT1634ACS8-1.25
LT1634ACS8-2.5
LT1634ACS8-4.096
LT1634ACS8-5
LT1634AIS8-1.25
LT1634AIS8-2.5
LT1634AIS8-4.096
LT1634AIS8-5
LT1634BCS8-1.25
LT1634BCS8-2.5
LT1634BCS8-4.096
LT1634BCS8-5
LT1634BIS8-1.25
LT1634BIS8-2.5
LT1634BIS8-4.096
LT1634BIS8-5
MS8
LT1634BCMS8-1.25
LT1634BCMS8-2.5
Z
LT1634CCZ-1.25
LT1634CCZ-2.5
LT1634CCZ-4.096
LT1634CCZ-5
1.25V
Electrical characteristics The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
Reverse Breakdown Voltage
LT1634ACS8/LT1634BCMS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (IR = 10µA)
LT1634CCZ (IR = 10µA)
Reverse Breakdown Change
with Current (Note 4)
LT1634ACS8 (IR = 10µA)
l
LT1634AIS8 (IR = 10µA)
l
LT1634BCS8/LT1634BCMS8 (IR = 10µA)
l
LT1634BIS8 (IR = 10µA)
l
LT1634CCZ (IR = 10µA)
l
10µA ≤ IR ≤ 2mA
l
2mA ≤ IR ≤ 20mA
l
Minimum Operating Current
Temperature Coefficient (Note 8)
Reverse Dynamic Impedance (Note 5)
MIN
TYP
MAX
1.24937
–0.05
1.24750
–0.20
1.24849
–0.12
1.24781
–0.175
1.24718
–0.225
1.24547
–0.362
1.24531
–0.375
1.250
1.25062
0.05
1.25250
0.20
1.25149
0.12
1.25218
0.175
1.25281
0.225
1.25453
0.362
1.25469
0.375
1
2
8
10
7
1.250
1.250
1.250
1.250
1.250
1.250
0.25
0.30
2
2
l
LT1634A, IR = 10µA
LT1634B/LT1634C, IR = 10µA
10µA ≤ IR ≤ 2mA
Low Frequency Noise (Note 6)
IR = 10µA, 0.1Hz ≤ f ≤ 10Hz
Hysteresis (Note 7)
∆T = –40°C to 85°C
∆T = 0°C to 70°C
l
l
4
10
0.125
0.150
10
160
40
10
25
0.5
1.0
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
µA
ppm/°C
ppm/°C
Ω
Ω
µVP-P
ppm
ppm
1634ff
For more information www.linear.com/LT1634
3
LT1634
2.5V
Electrical characteristics
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
Reverse Breakdown Voltage
LT1634ACS8/LT1634BCMS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (IR = 10µA)
LT1634CCZ (IR = 10µA)
Reverse Breakdown Change
with Current (Note 4)
LT1634ACS8 (IR = 10µA)
l
LT1634AIS8 (IR = 10µA)
l
LT1634BCMS8/LT1634BCS8 (IR = 10µA)
l
LT1634BIS8 (IR = 10µA)
l
LT1634CCZ (IR = 10µA)
l
MIN
TYP
MAX
2.49875
–0.05
2.49500
–0.20
2.49700
–0.12
2.49562
–0.175
2.49437
–0.225
2.49094
–0.362
2.49062
–0.375
2.500
2.50125
0.05
2.50500
0.20
2.50300
0.12
2.50437
0.175
2.50562
0.225
2.50906
0.362
2.50937
0.375
1.5
3.0
8
10
8
10µA ≤ IR ≤ 2mA
2.500
2.500
2.500
2.500
2.500
0.30
0.40
2
2
l
2mA ≤ IR ≤ 20mA
l
Minimum Operating Current
2.500
l
Reverse Dynamic Impedance (Note 5)
LT1634A, IR = 10µA
LT1634B/LT1634C, IR = 10µA
10µA ≤ IR ≤ 2mA
Low Frequency Noise (Note 6)
IR = 10µA, 0.1Hz ≤ f ≤ 10Hz
4
10
0.15
0.20
15
Hysteresis (Note 7)
∆T = –40°C to 85°C
∆T = 0°C to 70°C
160
40
Temperature Coefficient (Note 8)
l
l
l
10
25
0.75
1.50
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
µA
ppm/°C
ppm/°C
Ω
Ω
µVP-P
ppm
ppm
4.096 electrical characteristics
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
Reverse Breakdown Voltage
LT1634ACS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (IR = 20µA)
LT1634CCZ (IR = 20µA)
Reverse Breakdown Change
with Current (Note 4)
LT1634ACS8 (IR = 20µA)
l
LT1634AIS8 (IR = 20µA)
l
LT1634BCS8 (IR = 20µA)
l
LT1634BIS8 (IR = 20µA)
l
LT1634CCZ (IR = 20µA)
l
20µA ≤ IR ≤ 2mA
l
2mA ≤ IR ≤ 20mA
l
Minimum Operating Current
4
l
MIN
TYP
MAX
4.09395
–0.05
4.08780
–0.20
4.09108
–0.12
4.08883
–0.175
4.08678
–0.225
4.08115
–0.362
4.08064
–0.375
4.096
4.09805
0.05
4.10419
0.20
4.10091
0.12
4.10317
0.175
4.10522
0.225
4.11085
0.362
4.11137
0.375
1.5
3.0
15
20
15
4.096
4.096
4.096
4.096
4.096
4.096
0.30
0.40
6
6
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
µA
1634ff
For more information www.linear.com/LT1634
LT1634
4.096V Electrical characteristics
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
Temperature Coefficient (Note 8)
LT1634A, IR = 20µA
LT1634B/LT1634C, IR = 20µA
20µA ≤ IR ≤ 2mA
MIN
TYP
MAX
UNITS
10
25
0.75
1.50
ppm/°C
ppm/°C
Ω
Ω
µVP-P
Low Frequency Noise (Note 6)
IR = 20µA, 0.1Hz ≤ f ≤ 10Hz
4
10
0.15
0.20
30
Hysteresis (Note 7)
∆T = –40°C to 85°C
∆T = 0°C to 70°C
160
40
Reverse Dynamic Impedance (Note 5)
l
l
l
ppm
ppm
5V Electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
Reverse Breakdown Voltage
LT1634ACS8/LT1634BCS8/
LT1634AIS8/LT1634BIS8 (IR = 20µA)
LT1634CCZ (IR = 20µA)
Reverse Breakdown Change
with Current (Note 4)
LT1634ACS8 (IR = 20µA)
l
LT1634AIS8 (IR = 20µA)
l
LT1634BCS8 (IR = 20µA)
l
LT1634BIS8 (IR = 20µA)
l
LT1634CCZ (IR = 20µA)
l
20µA ≤ IR ≤ 2mA
l
2mA ≤ IR ≤ 20mA
l
Minimum Operating Current
MIN
TYP
MAX
4.99750
–0.05
4.99000
–0.20
4.99400
–0.12
4.99125
–0.175
4.98875
–0.225
498188
–0.362
4.98126
–0.375
5.000
5.00250
0.05
5.01000
0.20
5.00600
0.12
5.00875
0.175
5.01125
0.225
5.01813
0.362
5.01876
0.375
1.5
3.0
15
20
15
5.000
5.000
5.000
5.000
5.000
5.000
0.30
0.40
6
6
l
Low Frequency Noise (Note 6)
IR = 20µA, 0.1Hz ≤ f ≤ 10Hz
4
10
0.15
0.20
35
Hysteresis (Note 7)
∆T = –40°C to 85°C
∆T = 0°C to 70°C
160
40
Temperature Coefficient (Note 8)
Reverse Dynamic Impedance (Note 5)
LT1634A, IR = 20µA
LT1634B/LT1634C, IR = 20µA
20µA ≤ IR ≤ 2mA
l
l
l
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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.
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.
10
25
0.75
1.50
UNITS
V
%
V
%
V
%
V
%
V
%
V
%
V
%
mV
mV
mV
mV
µA
ppm/°C
ppm/°C
Ω
Ω
µVP-P
ppm
ppm
Note 7: Hysteresis in output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C but the IC is
cycled to 85°C or –40°C before successive measurements. Hysteresis is
roughly proportional to the square of the temperature change. Hysteresis
is not normally a problem for operational temperature excursions where
the instrument might be stored at high or low temperature.
Note 8: Temperature coefficient is calculated from the minimum and
maximum output voltage measured at TMIN, Room and TMAX as follows:
TC = (VOMAX – VOMIN)/(TMAX – TMIN)
Incremental slope is also measured at 25°C.
For more information www.linear.com/LT1634
1634ff
5
LT1634
1.25v Typical Performance Characteristics
2.0
REVERSE VOLTAGE CHANGE (mV)
TA = –40°C TO 85°C
REVERSE CURRENT (µA)
8
6
4
2
0
0.8
0.4
1.2
REVERSE VOLTAGE (V)
0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–40
1.6
4
10µA
100µA
200µA
500µA
1mA
40
20
0
TEMPERATURE (°C)
–20
60
Reverse Dynamic Impedance
1
0.01
0.1
1
10
REVERSE CURRENT (mA)
100
Forward Characteristics
1.2
TA = 25°C
10
0.1
1
10
REVERSE CURRENT (mA)
1634-1.25 G03
Dynamic Impedance vs Frequency
DYNAMIC IMPEDANCE (Ω)
DYNAMIC IMPEDANCE (Ω)
1
0
0.01
10000
TA = 25°C
f = 25Hz
0.1
0.001
2
1634-1.25 G02
1634-1.25 G01
100
TA = –40°C TO 85°C
3
80
TA = 25°C
1000
100
IR = 10µA
COUT = 0µF
IR = 10µA
COUT = 0.022µF
10
IR = 100µA
COUT = 0.47µF
IR = 100µA
COUT = 0µF
1
0.1
0.01
100
FORWARD VOLTAGE (V)
10
Reverse Voltage Change
vs Current
Temperature Drift
REVERSE VOLTAGE CHANGE (mV)
Reverse Characteristics
0.1
1
10
FREQUENCY (kHz)
0.8
0.4
0
0.01
100
0.1
1
10
FORWARD CURRENT (mA)
1634-1.25 G05
1634-1.25 G04
0.1Hz to 10Hz Noise
100
1634-1.25 G06
Response Time
Response Time
8
NOISE VOLTAGE (µV/DIV)
TA = –40°C TO 85°C
6 IR = 10µA
1.5V
1V
0.5V
0V
4
2
OUT
5V
0V
0
–2
IN
IR = 10µA
COUT = 0
–4
200µs/DIV
1634-1.25 G08
1.5V
1V
0.5V
0V
OUT
5V
0V
IN
IR = 10µA
COUT = 0.1µF
20ms/DIV
1634-1.25 G09
–6
–8
0
10
20
30
40
50
TIME (SEC)
60
70
1634-1.25 G07
6
1634ff
For more information www.linear.com/LT1634
LT1634
2.5v Typical Performance Characteristics
4
TA = –40°C TO 85°C
REVERSE VOLTAGE CHANGE (mV)
8
6
4
2
0
0
0.5
1.5
2.0
1.0
REVERSE VOLTAGE (V)
2.5
3
2
1
0
–1
–2
–3
–4
–40
3.0
6
10µA
100µA
200µA
500µA
1mA
40
20
0
TEMPERATURE (°C)
–20
60
Reverse Dynamic Impedance
DYNAMIC IMPEDANCE (Ω)
DYNAMIC IMPEDANCE (Ω)
1
0.01
0.1
1
10
REVERSE CURRENT (mA)
100
10
5
0
–5
IR = 10µA
COUT = 0µF
100
IR = 10µA
COUT = 0.068µF
10
IR = 100µA
COUT = 0µF
1
0.1
0.01
TA = 25°C
0.1
IR = 100µA
COUT = 0.47µF
1
10
FREQUENCY (kHz)
100
0.8
0.4
0
0.01
0.1
1
10
FORWARD CURRENT (mA)
1634-2.5 G05
Response Time
3V
2V
1V
0V
5V
0V
5V
0V
200µs/DIV
100
1634-2.5 G06
3V
2V
1V
0V
IR = 10µA
COUT = 0
–10
100
Forward Characteristics
Response Time
TA = –40°C TO 85°C
IR = 10µA
0.1
1
10
REVERSE CURRENT (mA)
1000
0.1Hz to 10Hz Noise
NOISE VOLTAGE (µV/DIV)
2
1.2
1635-2.5 G04
15
3
TA = 25°C
1
20
4
Dynamic Impedance vs Frequency
10
0.1
0.001
5
1634-2.5 G03
10000
TA = 25°C
f = 25Hz
TA = –40°C TO 85°C
1634-2.5 G02
1634-2.5 G01
100
Reverse Voltage Change
vs Current
0
0.01
80
FORWARD VOLTAGE (V)
REVERSE CURRENT (µA)
10
Temperature Drift
REVERSE VOLTAGE CHANGE (mV)
Reverse Characteristics
1634-2.5 G08
IR = 10µA
COUT = 0.1µF
20ms/DIV
1634-2.5 G09
–15
–20
0
10
20
30
40
50
60
70
80
TIME (SEC)
1634-2.5 G07
1634ff
For more information www.linear.com/LT1634
7
LT1634
4.096v Typical Performance Characteristics
6
REVERSE VOLTAGE CHANGE (mV)
TA = –40°C to 85°C
REVERSE CURRENT (µA)
16
12
8
4
0
0
2
3
4
REVERSE VOLTAGE (V)
1
4
2
0
–2
–4
–6
–40
5
5
20µA
100µA
200µA
500µA
1mA
–20
0
40
20
TEMPERATURE (°C)
1634-4 G01
DYNAMIC IMPEDANCE (Ω)
DYNAMIC IMPEDANCE (Ω)
10
1
0.1
0.001
NOISE VOLTAGE (µV/DIV)
2
1
0
0.01
80
0.01
0.1
1
10
REVERSE CURRENT (mA)
100
IR = 20µA
COUT = 0µF
100
IR = 20µA
COUT = 0.033µF
10
IR = 100µA
COUT = 0.33µF
IR = 100µA
COUT = 0µF
1
0.1
0.01
0.1
1
10
FREQUENCY (kHz)
100
20
10
0
–10
TA = 25°C
0.8
0.4
0
0.01
0.1
1
10
FORWARD CURRENT (mA)
1634-4 G05
Response Time
6V
4V
2V
0V
10V
0V
10V
0V
500µs/DIV
100
1634-2.5 G06
6V
4V
2V
0V
IR = 20µA
COUT = 0
–20
100
Forward Characteristics
Response Time
TA = –40°C TO 85°C
IR = 20µA
0.1
1
10
REVERSE CURRENT (mA)
1634-4 G03
TA = 25°C
1000
0.1Hz to 10Hz Noise
30
3
1.2
1635-4 G04
40
4
Dynamic Impedance vs Frequency
10000
TA = 25°C
f = 25Hz
TA = –40°C TO 85°C
1634-4 G02
Reverse Dynamic Impedance
100
60
FORWARD VOLTAGE (V)
20
Reverse Voltage Change
vs Current
Temperature Drift
REVERSE VOLTAGE CHANGE (mV)
Reverse Characteristics
1634-4 G07
IR = 20µA
COUT = 0.1µF
20ms/DIV
1634-4 G08
–30
–40
0
10
20
30 40 50
TIME (SEC)
60
70
80
1634-4 G06
8
1634ff
For more information www.linear.com/LT1634
LT1634
5v Typical Performance Characteristics
8
TA = –40°C TO 85°C
REVERSE VOLTAGE CHANGE (mV)
16
12
8
4
0
0
2
3
4
REVERSE VOLTAGE (V)
1
5
6
4
2
0
–2
–4
–6
–8
–40
6
5
20µA
100µA
200µA
500µA
1mA
–20
0
40
20
TEMPERATURE (°C)
60
1634-5 G01
DYNAMIC IMPEDANCE (Ω)
DYNAMIC IMPEDANCE (Ω)
1
0.01
0.1
1
10
REVERSE CURRENT (mA)
100
1000
IR = 20µA
COUT = 0µF
100
10
IR = 100µA
COUT = 0µF
1
0.1
0.01
0.1
IR = 20µA
COUT = 0.1µF
IR = 100µA
COUT = 0.22µF
1
10
FREQUENCY (kHz)
100
0.8
0.4
0
0.01
10
0
–10
6V
4V
2V
0V
10V
0V
10V
0V
500µs/DIV
100
Response Time
6V
4V
2V
0V
IR = 20µA
COUT = 0
–20
0.1
1
10
FORWARD CURRENT (mA)
1634-2.5 G06
Response Time
20
100
TA = 25°C
1634-5 G05
0.1Hz to 10Hz Noise
TA = –40°C TO 85°C
IR = 20µA
0.1
1
10
REVERSE CURRENT (mA)
Forward Characteristics
1.2
1635-5 G04
NOISE VOLTAGE (µV/DIV)
1
TA = 25°C
10
30
2
Dynamic Impedance vs Frequency
TA = 25°C
f = 25Hz
40
3
1634-5 G03
10000
0.1
0.001
4
1634-5 G02
Reverse Dynamic Impedance
100
TA = –40°C TO 85°C
0
0.01
80
FORWARD VOLTAGE (V)
REVERSE CURRENT (µA)
20
Reverse Voltage Change
vs Current
Temperature Drift
REVERSE VOLTAGE CHANGE (mV)
Reverse Characteristics
1634-5 G07
IR = 20µA
COUT = 0.1µF
20ms/DIV
1634-5 G08
–30
–40
0
10
20
30 40 50
TIME (SEC)
60
70
80
1634-5 G06
1634ff
For more information www.linear.com/LT1634
9
LT1634
Applications Information
The reverse characteristics of the LT1634 behave like
a resistor in parallel with a Zener diode. This simple,
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 LT1634.
VIN ≥ 10.5V
– 1.25V
V
RB = OUT
10µA
+
VOUT
1.5V TO 10V
LT1495
LT1634-1.25
–
R1
50k TO 1.75M
R2
250k
1634 F01
Figure 1. Adjustable Output Voltage Reference
Typical Applications
The LT1634-5 Generates the LTC1448 Dual 12-Bit
DAC’s Reference and Supply Voltage
Reference for Micropower A/D Converter
5V
7.5V TO 12V
18k
VIN
LTC1286
1
2
LT1634-4.096
0.1µF
3
4
VREF
VCC
+IN
CLK
–IN
DOUT
GND CS/SHDN
3.48k
8
7
6
5
0.1µF
µC/µP
SERIAL
INTERFACE
LT1634-5
µC/µP
SERIAL
INTERFACE
2
3
4
1634 TA03
10
LTC1448
1
5V
0.1µF
CLK
VOUTB
DIN
VCC
CS/LD
REF
GND
VOUTA
8
7
6
5
VOUTB
0.1µF
VOUTA
1634 TA04
1634ff
For more information www.linear.com/LT1634
LT1634
package description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
7
8
.245
MIN
.160 ±.005
5
6
NOTE:
1. DIMENSIONS IN
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
3
2
4
.053 – .069
(1.346 – 1.752)
.008 – .010
(0.203 – 0.254)
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH
OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS
SHALL NOT EXCEED .006" (0.15mm)
4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE
.004 – .010
(0.101 – 0.254)
0°– 8° TYP
SO8 REV G 0212
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev G)
0.889 ±0.127
(.035 ±.005)
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ±.0015)
TYP
8
7 6 5
0.52
(.0205)
REF
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH,
PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED
0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR
PROTRUSIONS.INTERLEAD FLASH OR PROTRUSIONS
SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.102mm (.004") MAX
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
DETAIL “A”
1
1.10
(.043)
MAX
2 3
4
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS8) 0213 REV G
1634ff
For more information www.linear.com/LT1634
11
LT1634
Package Description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
Z Package
3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410 Rev C)
.180 ± .005
(4.572 ± 0.127)
.060 ± .005
(1.524± 0.127)
DIA
.90
(2.286)
NOM
.180 ± .005
(4.572 ± 0.127)
.500
(12.70)
MIN
.050 UNCONTROLLED
(1.270) LEAD DIMENSION
MAX
.016 ± .003
(0.406 ± 0.076)
.050
(1.27)
BSC
5°
NOM
.015 ± .002
(0.381 ± 0.051)
Z3 (TO-92) 1008 REV C
.098 +.016/–.04
(2.5 +0.4/–0.1)
2 PLCS
BULK PACK
TO-92 TAPE AND REEL
REFER TO TAPE AND REEL SECTION OF
LTC DATA BOOK FOR ADDITIONAL INFORMATION
.060 ± .010
(1.524 ± 0.254)
3
2
1
.140 ± .010
(3.556 ± 0.127)
10° NOM
12
1634ff
For more information www.linear.com/LT1634
LT1634
Revision History
(Revision history begins at Rev F)
REV
DATE
DESCRIPTION
F
10/14
Web Links Added
NC Pins Identified on MS8 and S8 Package
Revision History Added
PAGE NUMBER
All
2
13
1634ff
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.
For more
information
www.linear.com/LT1634
13
LT1634
Typical Applications
Single Cell Li-Ion Battery Supervisory Circuit (IQ = 20µA)
OFF
CHARGER
VBAT
1.75V
RS
51k
5%
–
A2
1/4 LT1496
+
+
A1
1/4 LT1496
R1
500k
0.1%
–
VBAT
+
1.25V
A3
1/4 LT1496
RH1
10M
5%
D1
RH2
10M
5%
D2
R3
1.75M
0.1%
A
T0 LOAD
RSW
1M
5%
BATTERY
–
A4
1/4 LT1496
–
+
R2
1.25M
0.1%
LT1634-1.25
SW
R4
1.25M
0.1%
1634 TA05
D1, D2: 1N458
R1 TO R4: CAR6 SERIES IRC (512) 992-7900
Micropower Voltage and Current Reference
R3
249k
0.1%
ZTX214C
R4
24k
5%
–
2 AAA
ALKALINE
CELLS
1/2 LT1495
R1 TO R3:
MAR5 SERIES, IRC
(512) 992-7900
+
1/2 LT1495
–
+
LT1634
1.25V
IOUT
1µA
COM
VOUT
1.5V
R1
200k
0.1%
R2
1M
0.1%
1634 TA06
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LTC1440
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
LT1495
1.5µA Precision Rail-to-Rail Dual Op Amp
1.5µA Max Supply Current, 100pA Max IOS
LTC1540
Nanopower Comparator with Reference
600nA Max Supply Current, 2% 1.182V Reference,
MSOP and SO-8 Packages
14 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LT1634
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com/LT1634
1634ff
LT 1014 REV F • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1998