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LT1634BIS8-2.5#PBF [Linear]

LT1634 - Micropower Precision Shunt Voltage Reference; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;
LT1634BIS8-2.5#PBF
型号： LT1634BIS8-2.5#PBF
厂家： Linear    Linear
描述：

LT1634 - Micropower Precision Shunt Voltage Reference; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C

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LT1634  
Micropower Precision  
Shunt Voltage Reference  
U
FEATURES  
DESCRIPTION  
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 accu-  
racy. Improved curvature correction technique guaran-  
tees 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,butisstablewithcapacitiveloads.Lowdynamic  
impedance makes the LT1634 reference easy to use from  
unregulated supplies.  
■
Initial Voltage Accuracy: 0.05%  
■
Low Operating Current: 10µA  
■
■
■
Low Drift: 10ppm/°C Max  
Less Than 1Ω Dynamic Impedance  
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  
Both Commercial and Industrial Temperature Range  
Parts Are Available  
U
APPLICATIONS  
TheLT1634referencecanbeusedasahighperformance  
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  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Super Accurate ±4.096V Output References  
5V  
45k  
+
V
OUT  
LT1495  
LT1634-4.096  
4.096V  
Temperature Drift  
–
2.0  
–5V  
I
= 10µA  
= 1.25V  
R
OUT  
V
5V  
4
1.5  
1.0  
LTC®1043  
5
6
0.5  
0
I
= 200µA  
S
OUTPUT ACCURACY  
BETTER THAN 0.075%  
AT ±500µA OUTPUT  
1µF  
–0.5  
–1.0  
–1.5  
15  
18  
17  
–5V  
–2.0  
5V  
–20  
20  
40  
60  
80  
100  
–40  
0
TEMPERATURE (°C)  
–
1634 TA02  
V
OUT  
LT1495  
–4.096V  
+
1µF  
–5V  
1634 TA01  
1
LT1634  
W W U W  
ABSOLUTE MAXIMUM RATINGS  
Operating Current  
Operating Temperature Range  
1.25V............................................................. 100mA  
2.5V................................................................. 50mA  
4.096V, 5V........................................................ 30mA  
Forward Current................................................... 20mA  
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  
U
W U  
PACKAGE/ORDER INFORMATION  
TOP VIEW  
TOP VIEW  
1
2
3
4
8
7
6
5
DNC*  
DNC*  
DNC*  
GND  
DNC*  
DNC*  
DNC*  
DNC*  
DNC*  
GND  
1
2
3
4
8 DNC*  
7 DNC*  
6 V  
OUT  
V
OUT  
5 TEST**  
TEST**  
MS8 PACKAGE  
8-LEAD PLASTIC MSOP  
S8 PACKAGE  
8-LEAD PLASTIC SO  
TJMAX = 125°C, θJA = 190°C/ W  
TJMAX = 125°C, θJA = 250°C/ W  
ORDER PART NUMBER  
MS8 PART MARKING  
ORDER PART NUMBER  
S8 PART MARKING  
LT1634BCMS8-1.25  
LT1634BCMS8-2.5  
LTCV  
LTDF  
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  
634A1  
634A2  
634A4  
634A5  
634AI1  
634AI2  
634AI4  
634AI5  
634B1  
634B2  
634B4  
634B5  
634BI1  
634BI2  
634BI4  
634BI5  
ORDER PART NUMBER  
BOTTOM VIEW  
3
2
1
LT1634CCZ-1.25  
LT1634CCZ-2.5  
LT1634CCZ-4.096  
LT1634CCZ-5  
TEST** V  
GND  
OUT  
Z PACKAGE  
3-LEAD PLASTIC TO-92  
TJMAX = 125°C, θJA = 190°C/ W  
*Connected internally. Do Not Connect external circuitry to these pins.  
**Connect to ground in user application.  
Consult factory for Military grade parts.  
2
LT1634  
U
AVAILABLE OPTIO S  
PACKAGE TYPE  
S8  
TEMPERATURE COEFFICIENT  
TEMPERATURE  
ACCURACY (%)  
(ppm/°C)  
MS8  
Z
0°C to 70°C  
0.05  
10  
LT1634ACS8-1.25  
LT1634ACS8-2.5  
LT1634ACS8-4.096  
LT1634ACS8-5  
–40°C to 85°C  
0°C to 70°C  
0.05  
0.05  
0.05  
0.20  
10  
25  
25  
25  
LT1634AIS8-1.25  
LT1634AIS8-2.5  
LT1634AIS8-4.096  
LT1634AIS8-5  
LT1634BCMS8-1.25  
LT1634BCMS8-2.5  
LT1634BCS8-1.25  
LT1634BCS8-2.5  
LT1634BCS8-4.096  
LT1634BCS8-5  
–40°C to 85°C  
0°C to 70°C  
LT1634BIS8-1.25  
LT1634BIS8-2.5  
LT1634BIS8-4.096  
LT1634BIS8-5  
LT1634CCZ-1.25  
LT1634CCZ-2.5  
LT1634CCZ-4.096  
LT1634CCZ-5  
1.25V ELECTRICAL CHARACTERISTICS (Note 2)  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Reverse Breakdown Voltage  
LT1634ACS8/LT1634BCMS8/LT1634BCS8/  
1.24937  
–0.05  
1.250 1.25062  
0.05  
V
%
LT1634AIS8/LT1634BIS8 (I = 10µA)  
R
LT1634CCZ (I = 10µA)  
1.24750  
–0.20  
1.250 1.25250  
0.20  
V
%
R
LT1634ACS8 (I = 10µA)  
●
●
●
●
●
1.24849  
–0.12  
1.250 1.25149  
0.12  
V
R
%
LT1634AIS8 (I = 10µA)  
1.24781  
–0.175  
1.250 1.25218  
0.175  
V
%
R
LT1634BCS8/LT1634BCMS8 (I = 10µA)  
1.24718  
–0.225  
1.250 1.25281  
0.225  
V
%
R
LT1634BIS8 (I = 10µA)  
1.24547  
–0.362  
1.250 1.25453  
0.362  
V
%
R
LT1634CCZ (I = 10µA)  
1.24531  
–0.375  
1.250 1.25469  
0.375  
V
%
R
Reverse Breakdown Change  
with Current (Note 3)  
10µA ≤ I ≤ 2mA  
0.25  
0.30  
1
2
mV  
mV  
R
●
2mA ≤ I ≤ 20mA  
2
2
8
mV  
mV  
R
●
●
10  
Minimum Operating Current  
Temperature Coefficient  
7
µA  
LT1634A, I = 10µA  
●
●
4
10  
10  
25  
ppm/°C  
ppm/°C  
R
LT1634B, I = 10µA  
R
Reverse Dynamic Impedance (Note 4)  
10µA ≤ I ≤ 2mA  
0.125  
0.150  
0.5  
1.0  
Ω
Ω
R
●
Low Frequency Noise (Note 5)  
Hysteresis (Note 6)  
I = 10µA, 0.1Hz ≤ f ≤ 10Hz  
10  
µV  
P-P  
R
∆T = –40°C to 85°C  
∆T = 0°C to 70°C  
160  
40  
ppm  
ppm  
3
LT1634  
2.5V ELECTRICAL CHARACTERISTICS (Note 2)  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Reverse Breakdown Voltage  
LT1634ACS8/LT1634BCMS8/LT1634BCS8/  
2.49875  
–0.05  
2.500 2.50125  
0.05  
V
%
LT1634AIS8/LT1634BIS8 (I = 10µA)  
R
LT1634CCZ (I = 10µA)  
2.49500  
–0.20  
2.500 2.50500  
0.20  
V
%
R
LT1634ACS8 (I = 10µA)  
●
●
●
●
●
2.49700  
–0.12  
2.500 2.50300  
0.12  
V
R
%
LT1634AIS8 (I = 10µA)  
2.49562  
–0.175  
2.500 2.50437  
0.175  
V
%
R
LT1634BCMS8/LT1634BCS8 (I = 10µA)  
2.49437  
–0.225  
2.500 2.50562  
0.225  
V
%
R
LT1634BIS8 (I = 10µA)  
2.49094  
–0.362  
2.500 2.50906  
0.362  
V
%
R
LT1634CCZ (I = 10µA)  
2.49062  
–0.375  
2.500 2.50937  
0.375  
V
%
R
Reverse Breakdown Change  
with Current (Note 3)  
10µA ≤ I ≤ 2mA  
0.30  
0.40  
1.5  
3.0  
mV  
mV  
R
●
2mA ≤ I ≤ 20mA  
2
2
8
mV  
mV  
R
●
●
10  
Minimum Operating Current  
Temperature Coefficient  
8
µA  
LT1634A, I = 10µA  
●
●
4
10  
10  
25  
ppm/°C  
ppm/°C  
R
LT1634B, I = 10µA  
R
Reverse Dynamic Impedance (Note 4)  
10µA ≤ I ≤ 2mA  
0.15  
0.20  
0.75  
1.50  
Ω
Ω
R
●
Low Frequency Noise (Note 5)  
Hysteresis (Note 6)  
I = 10µA, 0.1Hz ≤ f ≤ 10Hz  
15  
µV  
P-P  
R
∆T = –40°C to 85°C  
∆T = 0°C to 70°C  
160  
40  
ppm  
ppm  
4.096V ELECTRICAL CHARACTERISTICS (Note 2)  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Reverse Breakdown Voltage  
LT1634ACS8/LT1634BCS8/  
4.09395  
–0.05  
4.096 4.09805  
0.05  
V
%
LT1634AIS8/LT1634BIS8 (I = 20µA)  
R
LT1634CCZ (I = 20µA)  
4.08780  
–0.20  
4.096 4.10419  
0.20  
V
%
R
LT1634ACS8 (I = 20µA)  
●
●
●
●
●
4.09108  
–0.12  
4.096 4.10091  
0.12  
V
R
%
LT1634AIS8 (I = 20µA)  
4.08883  
–0.175  
4.096 4.10317  
0.175  
V
%
R
LT1634BCS8 (I = 20µA)  
4.08678  
–0.225  
4.096 4.10522  
0.225  
V
%
R
LT1634BIS8 (I = 20µA)  
4.08115  
–0.362  
4.096 4.11085  
0.362  
V
%
R
LT1634CCZ (I = 20µA)  
4.08064  
–0.375  
4.096 4.11137  
0.375  
V
%
R
Reverse Breakdown Change  
with Current (Note 3)  
20µA ≤ I ≤ 2mA  
0.3  
0.4  
1.5  
3.0  
mV  
mV  
R
●
2mA ≤ I ≤ 20mA  
2
2
8
mV  
mV  
R
●
●
10  
Minimum Operating Current  
15  
µA  
4
LT1634  
4.096V ELECTRICAL CHARACTERISTICS (Note 2)  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Temperature Coefficient  
LT1634A, I = 20µA  
●
●
4
10  
10  
25  
ppm/°C  
ppm/°C  
R
LT1634B, I = 20µA  
R
Reverse Dynamic Impedance (Note 4)  
20µA ≤ I ≤ 2mA  
0.15  
0.20  
0.75  
1.50  
Ω
Ω
R
●
Low Frequency Noise (Note 5)  
Hysteresis (Note 6)  
I = 20µA, 0.1Hz ≤ f ≤ 10Hz  
30  
µV  
P-P  
R
∆T = –40°C to 85°C  
∆T = 0°C to 70°C  
160  
40  
ppm  
ppm  
5V ELECTRICAL CHARACTERISTICS  
(Note 2)  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Reverse Breakdown Voltage  
LT1634ACS8/LT1634BCS8/  
4.99750  
–0.05  
5.000 5.00250  
0.05  
V
%
LT1634AIS8/LT1634BIS8 (I = 20µA)  
R
LT1634CCZ (I = 20µA)  
4.99000  
–0.20  
5.000 5.01000  
0.20  
V
%
R
LT1634ACS8 (I = 20µA)  
●
●
●
●
●
4.99400  
–0.12  
5.000 5.00600  
0.12  
V
R
%
LT1634AIS8 (I = 20µA)  
4.99125  
–0.175  
5.000 5.00875  
0.175  
V
%
R
LT1634BCS8 (I = 20µA)  
4.98875  
–0.225  
5.000 5.01125  
0.225  
V
%
R
LT1634BIS8 (I = 20µA)  
498188  
–0.362  
5.000 5.01813  
0.362  
V
%
R
LT1634CCZ (I = 20µA)  
4.98126  
–0.375  
5.000 5.01876  
0.375  
V
%
R
Reverse Breakdown Change  
with Current (Note 3)  
20µA ≤ I ≤ 2mA  
0.3  
0.4  
1.5  
3.0  
mV  
mV  
R
●
2mA ≤ I ≤ 20mA  
2
2
8
mV  
mV  
R
●
●
10  
Minimum Operating Current  
Temperature Coefficient  
15  
µA  
LT1634A, I = 20µA  
●
●
4
10  
10  
25  
ppm/°C  
ppm/°C  
R
LT1634B, I = 20µA  
R
Reverse Dynamic Impedance (Note 4)  
20µA ≤ I ≤ 2mA  
0.15  
0.20  
0.75  
1.50  
Ω
Ω
R
●
Low Frequency Noise (Note 5)  
Hysteresis (Note 6)  
I = 20µA, 0.1Hz ≤ f ≤ 10Hz  
35  
µV  
P-P  
R
∆T = –40°C to 85°C  
∆T = 0°C to 70°C  
160  
40  
ppm  
ppm  
The  
●
denotes specifications which apply over the full operating  
Note 5: Peak-to-peak noise is measured with a single highpass filter at  
0.1Hz and 2-pole lowpass filter at 10Hz.  
temperature range.  
Note 1: If the part is stored outside of the specific operating temperature  
range, the output may shift due to hysteresis.  
Note 2: ESD (Electrostatic Discharge) sensitive device. Use proper ESD  
handling precautions.  
Note 3: Output requires 0.1µF for operating current greater than 1mA.  
Note 4: This parameter is guaranteed by “reverse breakdown change with  
current” test.  
Note 6: 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.  
5
LT1634  
1.25V TYPICAL PERFOR A CE CHARACTERISTICS  
U W  
Reverse Voltage Change  
vs Current  
Reverse Characteristics  
Temperature Drift  
2.0  
4
3
2
1
0
10  
8
T
= –40°C TO 85°C  
10µA  
T
A
= –40°C TO 85°C  
A
100µA  
200µA  
500µA  
1mA  
1.5  
1.0  
0.5  
0
6
4
–0.5  
–1.0  
–1.5  
2
–2.0  
0
0.4  
0.8  
1.2  
–40 –20  
20  
0
TEMPERATURE (°C)  
40  
60  
80  
0.01  
0.1  
1
10  
100  
0
1.6  
REVERSE CURRENT (mA)  
REVERSE VOLTAGE (V)  
1634-1.25 G03  
1634-1.25 G01  
1634-1.25 TA02  
Reverse Dynamic Impedance  
Dynamic Impedance vs Frequency  
Forward Characteristics  
1.2  
10000  
1000  
100  
100  
10  
1
T
= 25°C  
T
= 25°C  
A
A
T
A
= 25°C  
f = 25Hz  
I
= 10µA  
0.8  
0.4  
0
R
I
= 10µA  
R
C
= 0.022µF  
OUT  
C
= 0µF  
OUT  
10  
I
= 100µA  
= 0.47µF  
R
C
OUT  
I
= 100µA  
OUT  
1
R
C
= 0µF  
0.1  
0.1  
0.01  
0.1  
1
10  
100  
0.001  
0.01  
0.1  
1
10  
100  
0.01  
0.1  
1
10  
100  
FORWARD CURRENT (mA)  
REVERSE CURRENT (mA)  
FREQUENCY (kHz)  
1634-1.25 G06  
1634-1.25 G04  
1634-1.25 G05  
Response Time  
Response Time  
0.1Hz to 10Hz Noise  
8
T
= –40°C TO 85°C  
= 10µA  
R
A
1.5V  
1V  
1.5V  
1V  
I
6
4
0.5V  
0V  
0.5V  
0V  
OUT  
IN  
OUT  
IN  
2
5V  
0V  
0
5V  
0V  
–2  
–4  
–6  
–8  
1634-1.25 G08  
1634-1.25 G09  
IR = 10µA  
COUT = 0.1µF  
IR = 10µA  
COUT = 0  
200µs/DIV  
20ms/DIV  
0
10  
20 30  
40  
50 60  
70  
TIME (SEC)  
1634-1.25 G07  
6
LT1634  
U W  
2.5V TYPICAL PERFOR A CE CHARACTERISTICS  
Reverse Voltage Change  
vs Current  
Reverse Characteristics  
Temperature Drift  
6
5
4
3
2
1
0
4
10  
8
T
= –40°C TO 85°C  
T
= –40°C TO 85°C  
10µA  
A
A
100µA  
200µA  
500µA  
1mA  
3
2
1
0
6
4
–1  
–2  
–3  
2
–4  
0
0.01  
0.1  
1
10  
100  
–20  
20  
40  
60  
80  
–40  
0
0
0.5  
1.5  
2.0  
2.5  
3.0  
1.0  
REVERSE CURRENT (mA)  
REVERSE VOLTAGE (V)  
TEMPERATURE (°C)  
1634-2.5 G03  
1634-2.5 G02  
1634-2.5 G01  
Reverse Dynamic Impedance  
Forward Characteristics  
Dynamic Impedance vs Frequency  
1.2  
10000  
1000  
100  
100  
10  
1
T
= 25°C  
T = 25°C  
A
A
T
= 25°C  
A
f = 25Hz  
I
= 10µA  
R
0.8  
0.4  
0
C
= 0µF  
OUT  
I
= 10µA  
R
C
= 0.068µF  
OUT  
10  
I
= 100µA  
= 0.47µF  
R
C
OUT  
I
= 100µA  
OUT  
R
C
= 0µF  
1
0.1  
0.1  
0.01  
0.1  
1
FREQUENCY (kHz)  
10  
100  
0.01  
0.1  
1
10  
100  
0.001  
0.01  
0.1  
1
10  
100  
FORWARD CURRENT (mA)  
REVERSE CURRENT (mA)  
1634-2.5 G05  
1634-2.5 G06  
1635-2.5 G04  
0.1Hz to 10Hz Noise  
Response Time  
Response Time  
20  
15  
T
R
= –40°C TO 85°C  
= 10µA  
A
3V  
3V  
2V  
1V  
0V  
I
2V  
1V  
0V  
10  
5
5V  
0V  
5V  
0V  
0
–5  
1634-2.5 G08  
1634-2.5 G09  
IR = 10µA  
COUT = 0.1µF  
IR = 10µA  
COUT = 0  
200µs/DIV  
20ms/DIV  
–10  
–15  
–20  
20 30 40 50  
TIME (SEC)  
0
10  
60 70 80  
1634-2.5 G07  
7
LT1634  
4.096V TYPICAL PERFOR A CE CHARACTERISTICS  
U W  
Reverse Voltage Change  
vs Current  
Reverse Characteristics  
Temperature Drift  
6
4
20  
16  
12  
8
5
4
3
2
1
0
T
A
= –40°C TO 85°C  
T
= –40°C to 85°C  
20µA  
A
100µA  
200µA  
500µA  
1mA  
2
0
–2  
–4  
–6  
4
0
0
2
3
4
5
–20  
0
40  
60  
80  
0.01  
0.1  
1
10  
100  
1
–40  
20  
REVERSE VOLTAGE (V)  
REVERSE CURRENT (mA)  
TEMPERATURE (°C)  
1634-4 G03  
1634-4 G01  
1634-4 G02  
Reverse Dynamic Impedance  
Dynamic Impedance vs Frequency  
Forward Characteristics  
10000  
1000  
100  
1.2  
100  
10  
1
T
= 25°C  
T
= 25°C  
A
T = 25°C  
A
A
f = 25Hz  
I
= 20µA  
R
C
= 0µF  
OUT  
0.8  
0.4  
0
I
= 20µA  
R
C
= 0.033µF  
OUT  
I
= 100µA  
= 0.33µF  
10  
R
C
OUT  
I
= 100µA  
OUT  
R
C
= 0µF  
1
0.1  
0.1  
0.01  
0.1  
1
10  
100  
0.01  
0.1  
1
10  
100  
0.001  
0.01  
0.1  
1
10  
100  
FREQUENCY (kHz)  
FORWARD CURRENT (mA)  
REVERSE CURRENT (mA)  
1634-4 G05  
1634-2.5 G06  
1635-4 G04  
0.1Hz to 10Hz Noise  
Response Time  
Response Time  
40  
30  
T
R
= –40°C TO 85°C  
= 20µA  
A
6V  
4V  
2V  
0V  
6V  
4V  
2V  
0V  
I
20  
10  
10V  
0V  
10V  
0V  
0
–10  
–20  
–30  
–40  
1634-4 G07  
1634-2.5 G08  
IR = 20µA  
COUT = 0.1µF  
IR = 20µA  
COUT = 0  
500µs/DIV  
20ms/DIV  
40 50  
0
10 20 30  
60 70 80  
TIME (SEC)  
1634-4 G06  
8
LT1634  
U W  
5V TYPICAL PERFOR A CE CHARACTERISTICS  
Reverse Voltage Change  
vs Current  
Reverse Characteristics  
Temperature Drift  
20  
16  
12  
8
8
5
4
3
2
1
0
T
= –40°C TO 85°C  
T
= –40°C TO 85°C  
20µA  
A
A
100µA  
200µA  
500µA  
1mA  
6
4
2
0
–2  
–4  
–6  
4
0
–8  
0
2
3
4
5
6
1
–40 –20  
0
20  
40  
60  
80  
0.01  
0.1  
1
10  
100  
REVERSE VOLTAGE (V)  
REVERSE CURRENT (mA)  
TEMPERATURE (°C)  
1634-5 G03  
1634-5 G01  
1634-5 G02  
Reverse Dynamic Impedance  
Dynamic Impedance vs Frequency  
Forward Characteristics  
1.2  
10000  
1000  
100  
100  
10  
1
T
A
= 25°C  
T
= 25°C  
T
= 25°C  
A
A
f = 25Hz  
I
= 20µA  
R
C
= 0µF  
OUT  
0.8  
0.4  
0
I
= 20µA  
= 0.1µF  
R
10  
C
OUT  
I
= 100µA  
= 0.22µF  
R
C
OUT  
I
= 100µA  
1
R
C
= 0µF  
OUT  
0.1  
0.1  
0.1  
0.01  
1
10  
100  
0.01  
0.1  
1
10  
100  
0.001  
0.01  
0.1  
1
10  
100  
FREQUENCY (kHz)  
FORWARD CURRENT (mA)  
REVERSE CURRENT (mA)  
1634-5 G05  
1634-2.5 G06  
1635-5 G04  
Response Time  
Response Time  
0.1Hz to 10Hz Noise  
40  
30  
T
R
= –40°C TO 85°C  
= 20µA  
A
6V  
4V  
2V  
0V  
6V  
4V  
I
2V  
0V  
20  
10  
10V  
0V  
10V  
0V  
0
–10  
–20  
–30  
–40  
1634-5 G07  
1634-5 G08  
I
R = 20µA  
IR = 20µA  
COUT = 0  
500µs/DIV  
20ms/DIV  
COUT = 0.1µF  
40 50  
10 20 30  
TIME (SEC)  
0
60 70 80  
1634-5 G06  
9
LT1634  
U
W U U  
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 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 LT1634.  
V
≥ 10.5V  
IN  
V
– 1.25V  
10µA  
OUT  
R
=
B
+
V
OUT  
LT1495  
LT1634-1.25  
1.5V TO 10V  
R1  
50k TO 1.75M  
–
R2  
250k  
1634 F01  
Figure 1. Adjustable Output Voltage Reference  
U
TYPICAL APPLICATIONS  
Reference for Micropower A/D Converter  
5V  
V
18k  
LTC1286  
IN  
1
2
3
4
8
7
6
5
5V  
V
V
CC  
REF  
0.1µF  
+IN  
–IN  
CLK  
0.1µF  
µC/µP  
LT1634-4.096  
D
SERIAL  
OUT  
INTERFACE  
GND CS/SHDN  
1634 TA03  
The LT1634-5 Generates the LTC1448 Dual 12-Bit  
DAC’s Reference and Supply Voltage  
7.5V TO 12V  
3.48k  
LTC1448  
1
2
3
4
8
7
6
5
V
CLK  
V
OUTB  
OUTB  
µC/µP  
SERIAL  
INTERFACE  
D
IN  
V
CC  
0.1µF  
LT1634-5  
CS/LD  
REF  
GND  
OUTA  
V
V
OUTA  
0.1µF  
1634 TA04  
10  
LT1634  
U
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.  
MS8 Package  
8-Lead Plastic MSOP  
(LTC DWG # 05-08-1660)  
0.118 ± 0.004*  
(3.00 ± 0.102)  
8
7
6
5
0.040 ± 0.006  
(1.02 ± 0.15)  
0.034 ± 0.004  
(0.86 ± 0.102)  
0.007  
(0.18)  
0° – 6° TYP  
0.118 ± 0.004**  
(3.00 ± 0.102)  
SEATING  
PLANE  
0.192 ± 0.004  
(4.88 ± 0.10)  
0.012  
(0.30)  
REF  
0.021 ± 0.006  
(0.53 ± 0.015)  
0.006 ± 0.004  
(0.15 ± 0.102)  
0.0256  
(0.65)  
TYP  
MSOP (MS8) 1197  
1
2
3
4
*
DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,  
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.  
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
S8 Package  
8-Lead Plastic Small Outline (Narrow 0.150)  
(LTC DWG # 05-08-1610)  
0.189 – 0.197*  
(4.801 – 5.004)  
0.010 – 0.020  
(0.254 – 0.508)  
7
5
8
6
× 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  
0.150 – 0.157**  
(3.810 – 3.988)  
0.228 – 0.244  
(5.791 – 6.197)  
0.016 – 0.050  
0.406 – 1.270  
0.050  
(1.270)  
TYP  
0.014 – 0.019  
(0.355 – 0.483)  
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH  
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
SO8 0996  
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD  
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE  
1
3
4
2
Z Package  
3-Lead Plastic TO-92 (Similar to TO-226)  
(LTC DWG # 05-08-1410)  
0.180 ± 0.005  
(4.572 ± 0.127)  
0.060 ± 0.005  
0.060 ± 0.010  
(1.524 ± 0.254)  
(1.524± 0.127)  
DIA  
0.90  
(2.286)  
NOM  
0.140 ± 0.010  
(3.556 ± 0.127)  
0.180 ± 0.005  
(4.572 ± 0.127)  
Z3 (TO-92) 0695  
5°  
NOM  
10° NOM  
0.500  
(12.70)  
MIN  
0.050  
(1.270)  
MAX  
UNCONTROLLED  
LEAD DIMENSION  
0.016 ± 0.003  
0.015 ± 0.002  
(0.406 ± 0.076)  
(0.381 ± 0.051)  
0.050 ± 0.005  
(1.270 ± 0.127)  
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  
LT1634  
TYPICAL APPLICATIONS  
U
Single Cell Li-Ion Battery Supervisory Circuit (IQ = 20µA)  
OFF  
CHARGER  
V
BAT  
SW  
T0 LOAD  
1.75V  
–
R3  
1.75M  
0.1%  
A2  
R
51k  
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  
LT1634-1.25  
1.25M  
0.1%  
R4  
1.25M  
0.1%  
1634 TA05  
D1, D2: 1N458  
R1 TO R4: CAR6 SERIES IRC (512) 992-7900  
Micropower Voltage and Current Reference  
R1 TO R3:  
MAR5 SERIES, IRC  
(512) 992-7900  
R3  
2 AAA  
ALKALINE  
CELLS  
R4  
249k  
24k  
0.1%  
5%  
–
+
ZTX214C  
1/2 LT1495  
1/2 LT1495  
R1  
200k  
0.1%  
R2  
1M  
0.1%  
+
–
LT1634  
1.25V  
I
= 1µA  
COM  
V
OUT  
= 1.5V  
OUT  
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 I  
OS  
LTC1540  
Nanopower Comparator with Reference  
600nA Max Supply Current, 2% 1.182V Reference,  
MSOP and SO-8 Packages  
1634fa LT/TP 0698 2K REV A • PRINTED IN USA  
12 LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com  
LINEAR TECHNOLOGY CORPORATION 1998  

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