Texas Instruments LM385PS-1.2, LM385BDR-1-2, LM385D-1-2, LM385LPR-1-2, LM385LP-1-2 Datasheet
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LM285-1.2, LM385-1.2, LM385B-1.2
MICROPOWER VOLTAGE REFERENCES
SLVS075C ± APRIL 1989 ± REVISED JULY 1999
D |
Operating Current Range |
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D PACKAGE |
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± LM285 . . . 10 µA to 20 mA |
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(TOP VIEW) |
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± LM385 . . . 15 µA to 20 mA |
NC |
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CATHODE |
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± LM385B . . . 15 µA to 20 mA |
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8 |
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NC |
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D 1% and 2% Initial Voltage Tolerance |
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6 |
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Reference Impedance |
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D |
ANODE |
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NC |
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±LM385 . . . 1 Ω Max at 25°C
±All Devices . . . 1.5 Ω Max Over Full
Temperature Range |
LP PACKAGE |
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D Very Low Power Consumption |
(TOP VIEW) |
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D Applications: |
ANODE |
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± Portable Meter References |
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± Portable Test Instruments |
CATHODE |
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± Battery-Operated Systems |
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± Current-Loop Instrumentation |
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± Panel Meters |
NC±No internal connection |
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DDesigned to be Interchangeable With National LM285-1.2 and LM385-1.2
description
These micropower, two-terminal, band-gap voltage references operate over a 10-µA to 20-mA current range and feature exceptionally low dynamic impedance and good temperature stability. On-chip trimming provides tight voltage tolerance. The band-gap reference for these devices has low noise and long-term stability.
The design makes these devices exceptionally tolerant of capacitive loading and thus, easier to use in most reference applications. The wide dynamic operating temperature range accommodates varying current supplies with excellent regulation.
The extremely low power drain of this series makes them useful for micropower circuitry. These voltage references can be used to make portable meters, regulators, or general-purpose analog circuitry, with battery life approaching shelf life. The wide operating current range allows them to replace older references with tighter-tolerance parts.
The LM285-1.2 is characterized for operation from ±40°C to 85°C. The LM385-1.2 and LM385B-1.2 are characterized for operation from 0°C to 70°C.
AVAILABLE OPTIONS
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VZ |
PACKAGED DEVICES² |
CHIP FORM |
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TA |
SMALL OUTLINE |
PLASTIC |
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TOLERANCE |
(Y) |
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(D) |
(LP) |
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0°C to 70°C |
2% |
LM385D-1.2 |
LM385LP-1.2 |
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LM385Y-1.2 |
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1% |
LM385BD-1.2 |
LM385BLP-1.2 |
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±40°C to 85°C |
1% |
LM285D-1.2 |
LM285LP-1.2 |
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The D package is available taped and reeled. Add the suffix R to the device type (e.g., LM385DR-1-2).
The chip form is tested at TA = 25°C.
²For ordering purposes, the decimal point in the part number must be replaced with a hyphen (i.e., show the -1.2 suffix as ª-1-2º).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright 1999, Texas Instruments Incorporated
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
1 |
LM285-1.2, LM385-1.2, LM385B-1.2
MICROPOWER VOLTAGE REFERENCES
SLVS075C ± APRIL 1989 ± REVISED JULY 1999
symbol
ANODE |
CATHODE |
schematic
CATHODE
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Q13 |
7.5 kΩ |
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600 kΩ |
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Q12 |
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Q7 |
200 kΩ |
Q4 |
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Q11 |
Q3 |
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50 kΩ |
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Q10 |
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Q1 |
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300 kΩ |
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20 pF |
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20 pF |
Q2 |
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Q9 |
Q5 |
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Q6 |
Q8 |
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Q14 |
100 kΩ |
500 Ω |
60 kΩ |
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ANODE |
NOTE A: Component values shown are nominal. |
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absolute maximum ratings over operating free-air temperature range²
Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . 30 mA |
Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . 10 mA |
Package thermal impedance, θJA (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . |
. . . . . 197°C/W |
LP package . . . . . . . . . . . . . . . . . . . . . |
. . . . . 156°C/W |
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . 260°C |
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
±65°C to 150°C |
²Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Maximumpower dissipation is a function of TJ(max),θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) ± TA)/θJA. Operation at the absolute maximum TJ of 150°C can impact reliability.
2.The package thermal impedance is calculated in accordance with JESD51, except for through-hole packages which use a trace length of zero.
recommended operating conditions
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Reference current, IZ |
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0.01 |
20 |
mA |
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Operating free-air temperature range, TA |
LM285-1.2 |
±40 |
85 |
°C |
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LM385-1.2, LM385B-1.2 |
0 |
70 |
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POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
LM285-1.2, LM385-1.2, LM385B-1.2
MICROPOWER VOLTAGE REFERENCES
SLVS075C ± APRIL 1989 ± REVISED JULY 1999
electrical characteristics at specified free-air temperature
PARAMETER |
TEST |
T ² |
LM285-1.2 |
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LM385-1.2 |
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LM385B-1.2 |
UNIT |
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CONDITIONS |
MIN |
TYP |
MAX |
MIN |
TYP |
MAX |
MIN |
TYP |
MAX |
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A |
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VZ |
Reference |
IZ = I(min) |
25°C |
1.223 |
1.235 |
1.247 |
1.21 |
1.235 |
1.26 |
1.223 |
1.235 |
1.247 |
V |
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voltage |
to 20 mA³ |
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Average |
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temperature |
IZ = I(min) |
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αVZ |
coefficient of |
25°C |
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±20 |
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±20 |
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±20 |
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ppm/°C |
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to 20 mA³ |
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reference |
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voltage§ |
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Change in |
IZ = I(min) |
25°C |
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VZ |
reference |
to 1 mA³ |
Full range |
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1.5 |
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1.5 |
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1.5 |
mV |
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voltage with |
IZ = 1 mA |
25°C |
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12 |
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20 |
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20 |
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current |
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to 20 mA |
Full range |
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30 |
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30 |
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30 |
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Long-term |
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VZ/ t |
change in |
IZ = 100 µA |
25°C |
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±20 |
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±20 |
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±20 |
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ppm/khr |
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reference |
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voltage |
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Minimum |
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IZ(min) |
reference |
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Full range |
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8 |
10 |
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15 |
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15 |
µA |
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current |
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Reference |
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25°C |
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0.2 |
0.6 |
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0.4 |
1 |
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0.4 |
1 |
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zz |
IZ = 100 A, |
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Ω |
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impedance |
f = 25 Hz |
Full range |
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1.5 |
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1.5 |
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1.5 |
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Broadband |
IZ = 100 µA, |
25°C |
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µV |
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Vn |
f = 10 Hz to |
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60 |
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60 |
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60 |
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noise voltage |
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10 kHz |
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² Full range is ±40°C to 85°C for the LM285-1.2, and 0°C to 70°C for the LM385-1.2 and LM385B-1.2. ³ I(min) = 10 µA for the LM285-1.2 and 15 µA for the LM385-1.2 and LM385B-1.2.
§The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.
electrical characteristics, TA = 25°C
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PARAMETER |
TEST CONDITIONS |
LM385Y-1.2 |
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UNIT |
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MIN |
TYP |
MAX |
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VZ |
Reference voltage |
IZ = 15 |
µA to 20 mA |
1.21 |
1.235 |
1.26 |
V |
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αVZ |
Average temperature coefficient of reference voltage§ |
IZ = 15 |
µA to 20 mA |
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±20 |
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ppm/°C |
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VZ |
Change in reference voltage with current |
IZ = 15 |
µA to 1 mA |
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1 |
mV |
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IZ = 1 mA to 20 mA |
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20 |
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VZ/ t |
Long-term change in reference voltage |
IZ = 100 |
µA |
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±20 |
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ppm/khr |
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IZ(min) |
Minimum reference current |
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8 |
15 |
µA |
zz |
Reference impedance |
IZ = 100 |
µA |
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0.4 |
1 |
Ω |
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Vn |
Broadband noise voltage |
IZ = 100 |
µA, |
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60 |
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µV |
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f = 10 Hz to 10 kHz |
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§The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
3 |
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