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Part: LM385S8-1.2
Category:
Power Management
-> Voltage References
-> 1.25V
Description: Micropower Voltage Reference
Company: Linear Technology Corporation
Datasheet: Download LM385S8-1.2 datasheet File size : 12 kB
Request For quote: Find where to buy LM385S8-1.2
Datasheet text preview:
LM185-1.2/ LM285-1.2/LM385-1.2 Micropower Voltage Reference
FEATURES
s s s s
DESCRIPTIO
10µA to 20mA Operating Range Guaranteed 1% Initial Voltage Tolerance Guaranteed 1 Dynamic Impedance Very Low Power Consumption
APPLICATIO S
s s s s
Portable Meter References Portable Test Instruments Battery Operated Systems Current Loop Instrumentation
The LM185-1.2 is a two terminal band gap reference diode that has been designed for applications which require precision performance with micropower operation. The device provides guaranteed operating specifications at currents as low as 10µA. The nominal voltage is 1.235V with both 1% and 2% tolerances available. Some additional features are: maximum dynamic impedance of 1, low noise and excellent stability over time and temperature. Advanced design, processing and testing techniques make Linear's LM185-1.2 a superior choice over previous designs. A micropower 5V reference application is shown below. For guaranteed TC, micropower references, see the LT1034 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Micropower 5V Reference
VIN 7V TO 15V
OUTPUT VOLTAGE CHANGE (mV)
Reverse Voltage Change with Current
10 8 6 4 2 0 2 0.01 TA = 25°C
V LM334
+
R 5.6k 3
V
+
7 LT1494 6 5V 150pF 3.01M 1%
LM385-1.2 1M 1%
2
4
185/285/385 TA01a
U
0.1 1 10 REVERSE CURRENT (mA) 100
185/285/385 TA01b
U
U
1
LM185-1.2/ LM285-1.2/LM385-1.2
ABSOLUTE
AXI U RATI GS
Storage Temperature Range ........ 65°C to 150°C Lead Temperature (Soldering, 10 sec)......... 300°C Reverse Breakdown Current ......... 30mA Forward Current ......... 10mA
Operating Temperature Range LM185-1.2(OBSOLETE) ...... 55°C to 125°C LM285-1.2 ......... 40°C to 85°C LM385-1.2 .... 0°C to 70°C
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW
ORDER PART NUMBER LM185H-1.2 LM285H-1.2 LM385H-1.2 LM385BH-1.2
1
2
H PACKAGE 2-LEAD TO-46 METAL CAN TJMAX = 150°C, JA = 440°C/W, JC = 80°C/W (NOTE 3)
OBSOLETE PACKAGE
Consider the S8 or Z Packages for Alternate Source
TOP VIEW NC 1 NC 2 NC 3 4 8 7 NC 6
5 NC (DO S8 PACKAGE NOT USE) 8-LEAD PLASTIC SO
TJMAX = 150°C, JA = 190°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
WW U
W
BOTTOM VIEW
ORDER PART NUMBER LM285Z-1.2 LM385Z-1.2 LM385BZ-1.2
Z PACKAGE 3-LEAD PLASTIC TO-92 TJMAX = 150°C, JA = 160°C/W (NOTE 3)
ORDER PART NUMBER LM385BS8-1.2 LM385S8-1.2 S8 PART MARKING 3851 3851B
LM185-1.2/ LM285-1.2/LM385-1.2
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. For the LM185-1.2 TMIN = 55°C and TMAX = 125°C. For LM285-1.2 TMIN = 40°C and TMAX = 85°C.For LM385-1.2 TMIN = 0°C and TMAX = 70°C. For MIL-STD components, please refer to LTC883C data sheet for test listing and parameters.
SYMBOL VZ PARAMETER Reverse Breakdown Voltage CONDITIONS TA = 25°C, IMIN IR 20mA LM185-1.2 LM385-1.2 LM385B-1.2 (Note 3) IMIN IR 20mA (Notes 2, 3) TMIN TA TMAX IMIN IR 1mA TA = 25°C TMIN TA TMAX 1mA IR 20mA TA = 25°C TMIN TA TMAX rZ Reverse Dynamic Impedance IR = 100µA TA =25°C TMIN TA TMAX IR = 100µA, 10Hz f 10kHz IR = 100µA, TA = 25°C ± 0.1°C
q
ELECTRICAL CHARACTERISTICS
LM185-1.2/LM285-1.2 MIN TYP MAX 1.223 1.235 1.247
LM385-1.2/LM385B-1.2 MIN TYP MAX
UNITS V V V ppm/°C
1.205 1.223 20 8 10 1 1.5 10 20 0.2
q
1.235 1.235 20 8
1.260 1.247
VZ Temp I MIN VZ IR
Average Temperature Coefficient Minimum Operating Current Reverse Breakdown Voltage Change with Current
15 1 1.5 10 25
µA mV mV mV mV µV ppm/kHr
q
q
0.6 1.5
0.4 60 20
1.0 1.5
en VZ Time
Wideband Noise (RMS) Long Term Stability
60 20
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Selected devices with guaranteed maximum temperature coefficient are available upon request.
Note 3: For applications requiring low initial tolerance guaranteed over temperature consult the LT1004 data sheet.
3
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